[Federal Register Volume 61, Number 173 (Thursday, September 5, 1996)]
[Rules and Regulations]
[Pages 46906-46985]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-21941]



[[Page 46905]]


_______________________________________________________________________

Part II





Environmental Protection Agency





_______________________________________________________________________



40 CFR Part 63



National Emissions Standards for Hazardous Air Pollutant Emissions: 
Group I Polymers and Resins; Final Rule

  Federal Register / Vol. 61, No. 173 / Thursday, September 5, 1996 / 
Rules and Regulations  

[[Page 46906]]



ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63

[AD-FRL-5543-1]
RIN 2060-AE37


National Emission Standards for Hazardous Air Pollutant 
Emissions: Group I Polymers and Resins

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: This action promulgates national emission standards for 
hazardous air pollutants (NESHAP) from existing and new plant sites 
that emit organic hazardous air pollutants (HAP) identified on the 
EPA's list of 189 HAP. The organic HAP are emitted during the 
manufacture of one or more elastomers.
    In the production of elastomers, a variety of organic HAP are used 
as monomers or process solvents. Available emissions data gathered in 
conjunction with the development of the elastomer standards show that 
the following organic HAP are those which have the potential for 
reduction by implementation of the standard: Styrene, n-hexane, 1,3-
butadiene, acrylonitrile, methyl chloride, hydrogen chloride, carbon 
tetrachloride, chloroprene, and toluene. Some of these pollutants are 
considered to be mutagens and carcinogens, and all can cause reversible 
or irreversible toxic effects following exposure. The potential toxic 
effects include eye, nose, throat, and skin irritation; liver and 
kidney toxicity, and neurotoxicity. These effects can range from mild 
to severe. The rule is estimated to reduce organic HAP emissions from 
existing affected sources by over 6,300 megagrams per year (Mg/yr). The 
majority of the organic HAP regulated by these standards are also 
volatile organic compounds (VOC). In reducing emissions of organic HAP, 
VOC are also reduced.
    The rule implements section 112(d) of the Act, which requires the 
Administrator to regulate emissions of HAP listed in section 112(b) of 
the Act. The intended effect of this rule is to protect the public by 
requiring the maximum degree of reduction in emissions of organic HAP 
from new and existing major sources that the Administrator determines 
is achievable, taking into consideration the cost of achieving such 
emission reduction, and any nonair quality, health and environmental 
impacts, and energy requirements.

EFFECTIVE DATE: September 5, 1996. See the Supplementary Information 
section concerning judicial review.

ADDRESSES: Docket. Docket No. A-92-44, containing information 
considered by the EPA in development of the promulgated standards, is 
available for public inspection and copying between 8 a.m. and 4 p.m., 
Monday through Friday, at the following address in room M-1500, 
Waterside Mall (ground floor): U. S. Environmental Protection Agency, 
Air and Radiation Docket and Information Center (MC-6102), 401 M Street 
SW., Washington, DC 20460; telephone: (202) 260-7548. A reasonable fee 
may be charged for copying docket materials.

FOR FURTHER INFORMATION CONTACT: For questions concerning applicability 
and other rule determinations, inquiries should be directed to the 
appropriate regional office contact listed below:

Greg Roscoe, Air Programs Compliance, Branch Chief, U.S. EPA Region I, 
5EA, JFK Federal Building, Boston, MA 02203, (617) 565-3221.
Kenneth Eng, Air Compliance Branch Chief, U.S. EPA Region II, 290 
Broadway, New York, NY 10007-1866, (212) 637-4000.
Bernard Turlinski, Air Enforcement Branch Chief, U.S. EPA Region III 
(3AT10), 841 Chestnut Building, Philadelphia, PA 19107, (215) 597-3989.
Jewell A. Harper, Air Enforcement Branch, U.S. EPA Region IV, 3345 
Courtland Street, NE., Atlanta, GA 30365, (404) 347-2904.
George T. Czerniak, Jr., Air Enforcement Branch Chief, U.S. EPA Region 
V (5AE-26), 77 West Jackson Street, Chicago, IL 60604, (312) 353-2088.
John R. Hepola, Air Enforcement Branch Chief, U.S. EPA Region VI, 1445 
Ross Avenue, Suite 1200, Dallas, TX 75202-2733, (214) 665-7220.
Donald Toensing, Chief, Air Permitting and Compliance Branch, U.S. EPA 
Region VII, 726 Minnesota Avenue, Kansas City, KS 66101, (913) 551-
7446.
Douglas M. Skie, Air and Technical Operations, Branch Chief, U.S. EPA 
Region VIII, 999 18th Street, Suite 500, Denver, CO 80202-2466, (303) 
312-6432.
Colleen W. McKaughan, Air Compliance Branch Chief, U.S. EPA Region IX, 
75 Hawthorne Street, San Francisco, CA 94105, (415) 744-1198.
Christopher Hall, Air Toxics Program Manager, U.S. EPA Region X, 1200 
Sixth Avenue, OAQ-107, Seattle, WA 98101-9797, (206) 553-1949.

    For information concerning the technical analysis for this rule, 
contact Mr. Robert Rosensteel at (919) 541-5608, Organic Chemicals 
Group, Emission Standards Division (MD-13), U.S. Environmental 
Protection Agency, Research Triangle Park, North Carolina 27711.

SUPPLEMENTARY INFORMATION: Regulated entities. Entities potentially 
regulated by this action are elastomer product process units (EPPUs) 
manufacturing the same primary product and located at a plant site that 
is a major source of HAP. Regulated categories and entities include:

------------------------------------------------------------------------
            Category                  Examples of regulated entities    
------------------------------------------------------------------------
Industry........................  Producers of butyl rubber, halobutyl  
                                   rubber, epichlorohydrin elastomers,  
                                   ethylene propylene rubber, HypalonTM,
                                   neoprene, nitrile butadiene rubber,  
                                   nitrile butadiene latex, polysulfide 
                                   rubber, polybutadiene rubber/styrene 
                                   butadiene rubber by solution, styrene
                                   butadiene latex, and styrene         
                                   butadiene rubber by emulsion.        
------------------------------------------------------------------------

    This table is not intended to be exhaustive, but rather provides a 
guide for readers regarding entities likely to be regulated by this 
action. This table lists the types of entities that EPA is now aware 
could potentially be regulated by this action. Other types of entities 
not listed in the table could also be regulated. To determine whether 
your facility is regulated by this action, you should carefully examine 
the applicability criteria in Sec. 63.480 of the rule. If you have 
questions regarding the applicability of this action to a particular 
entity, consult the person listed in the preceding FOR FURTHER 
INFORMATION CONTACT section.
    Response to Comment Document. The response to comment document for 
the promulgated standards contains: (1) A summary of the public 
comments made on the proposed standards and the Administrator's 
response to the comments; and (2) A summary of the changes made to the 
standards since proposal. The document may be obtained from the U.S. 
EPA Library (MD-35), Research Triangle Park, North Carolina 27711, 
telephone (919) 541-2777; or from the National Technical Information 
Services, 5285 Port Royal Road, Springfield, Virginia 22151, telephone 
(703) 487-4650. Please refer to ``Hazardous Air Pollutant Emissions 
from Process Units in the Elastomers Manufacturing Industry--Basis and 
Purpose Document for Final Standards, Summary of Public Comments and

[[Page 46907]]

Responses'' (EPA-453/R-96-006b; May 1996). This document is also 
located in the docket (Docket Item No. V-C-1) and is available for 
downloading from the Technology Transfer Network. The Technology 
Transfer Network is one of the EPA's electronic bulletin boards. The 
Technology Transfer Network provides information and technology 
exchange in various areas of air pollution control. The service is free 
except for the cost of a phone call. Dial (919) 541-5742 for up to a 
14,400 bps modem. If more information on the Technology Transfer 
Network is needed, call the HELP line at (919) 541-5384.
    Previous Background Documents. The following is a listing of 
background documents pertaining to this rulemaking. The complete title, 
EPA publication number, publication date, and docket number are 
included. Where appropriate, the abbreviated descriptive title is used 
to refer to the document throughout this notice.
    (1) Hazardous Air Pollutant Emissions from Process Units in the 
Elastomer Manufacturing Industry--Supplementary Information Document 
for Proposed Standards. EPA-453/R-95-005a, May 1995; Docket number A-
92-44, item number III-B-2.
    (2) Hazardous Air Pollutant Emissions from Process Units in the 
Elastomer Manufacturing Industry--Basis and Purpose Document for 
Proposed Standards. EPA-453/R-95-006a, May 1995; Docket number A-92-44, 
item number III-B-1.
    Judicial Review. Under section 307(b)(1) of the Act, judicial 
review of the final rule is available only by filing a petition for 
review in the U.S. Court of Appeals for the District of Columbia 
Circuit within 60 days of today's publication of this final rule. Under 
section 307(b)(2) of the Act, the requirements that are the subject of 
today's notice may not be challenged later in civil or criminal 
proceedings brought by the EPA to enforce these requirements.
    The information presented in this preamble is organized as follows:

I. Summary of Considerations Made in Developing This Standard

A. Background and Purpose of the Regulation
B. Source of Authority
C. Technical Basis of Regulation
D. Stakeholder and Public Participation

II. Summary of Promulgated Standards

A. Storage Vessel Provisions
B. Front-End Process Vent Provisions
C. Back-end Process Provisions
D. Wastewater Provisions
E. Equipment Leak Provisions
F. Emissions Averaging Provisions
G. Compliance and Performance Test Provisions and Monitoring 
Requirements
H. Recordkeeping and Reporting Provisions

III. Summary of Impacts

A. Facilities Affected by these NESHAP
B. Primary Air Impacts
C. Other Environmental Impacts
D. Energy Impacts
E. Cost Impacts
F. Economic Impacts

IV. Significant Comments and Changes to the Proposed Standards

A. Applicability Provisions and Definitions
B. Storage Vessel Provisions
C. Continuous Front-end Process Vent Provisions
D. Batch Front-end Process Vent Provisions
E. Back-end Process Operation Provisions
F. Wastewater Operations Provisions
G. Equipment Leak Provisions
H. Emissions Averaging Provisions
I. Monitoring
J. Recordkeeping and Reporting

V. Administrative Requirements

A. Docket
B. Executive Order 12866
C. Paperwork Reduction Act
D. Regulatory Flexibility Act
E. Small Business Regulatory Enforcement Fairness Act of 1996 
(SBREFA)
F. Unfunded Mandates

I. Summary of Considerations Made in Developing This Standard

A. Background and Purpose of Regulation

    The Clean Air Act was created in part ``to protect and enhance the 
quality of the Nation's air resources so as to promote the public 
health and welfare and the productive capacity of its population'' 
(CAA, section 101(b)(1)). Section 112(b) lists 189 HAP believed to 
cause adverse health or environmental effects. Section 112(d) requires 
that emission standards be promulgated for all categories and 
subcategories of major sources of these HAP and for many smaller 
``area'' sources listed for regulation, pursuant to section 112(c). 
Major sources are defined as those that emit or have the potential to 
emit at least 10 tons per year of any single HAP or 25 tons per year of 
any combination of HAP.
    On July 16, 1992 (57 FR 31576), the EPA published a list of 
categories of sources slated for regulation. This list included all 
nine of the source categories regulated by the standards being 
promulgated today. The statute requires emissions standards for the 
listed source categories to be promulgated between November 1992 and 
November 2000. On December 3, 1993, the EPA published a schedule for 
promulgating these standards (58 FR 83841). Standards for the nine 
source categories covered by today's rule were proposed on June 12, 
1995 (60 FR 30801).
    For the purpose of this rule, the EPA has separated the 9 Group 1 
polymers into 12 elastomer products (i.e., subcategories). These 
products are butyl rubber (BR), halobutyl rubber (HBR), epichlorohydrin 
elastomers (EPI), ethylene propylene rubber (EPR), HypalonTM 
(HYP), neoprene (NEO), nitrile butadiene rubber (NBR), nitrile 
butadiene latex (NBL), polysulfide rubber (PSR), polybutadiene rubber/
styrene butadiene rubber by solution (PBR/SBRS), styrene butadiene 
latex (SBL), and styrene butadiene rubber by emulsion (SBRE).
    In the 1990 Amendments to the Clean Air Act, Congress specified 
that each standard for major sources must require the maximum reduction 
in emissions of HAP that the EPA determines is achievable, considering 
cost, non-air quality health and environmental impacts, and energy 
requirements. In essence, these Maximum Achievable Control Technology 
(MACT) standards would ensure that all major sources of air toxics 
achieve the level of control already being achieved by the better 
controlled and lower emitting sources in each category. This approach 
provides assurance to citizens that each major source of toxic air 
pollution will be required to employ good control measures to limit its 
emissions.
    Available emission data, collected during the development of this 
rule, shows that pollutants that are listed in section 112(b)(1) and 
are emitted by Group I Polymer and Resins sources include n-hexane, 
styrene, 1,3-butadiene, acrylonitrile, methyl chloride, carbon 
tetrachloride, chloroprene, and toluene. Some of these pollutants are 
considered to be probable human carcinogens when inhaled, and all can 
cause reversible and irreversible toxic effects following exposure. 
These effects include respiratory and skin irritation, effects upon the 
eye, various systemic effects including effects upon the liver, kidney, 
heart and circulatory systems, neurotoxic effects, and in extreme 
cases, death.
    The EPA does recognize that the degree of adverse effects to health 
can range from mild to severe. The extent and degree to which the 
health effects may be experienced is dependent upon (1) the ambient 
concentrations observed in the area (e.g., as influenced by emission 
rates, meteorological conditions, and terrain), (2) the frequency of 
and duration of exposures, (3) characteristics of the exposed 
individuals (e.g., genetics, age, pre-existing health conditions, and 
lifestyle) which vary significantly with the

[[Page 46908]]

population, and (4) pollutant specific characteristics (e.g., toxicity, 
half-life in the environment, bioaccumulation, and persistence).
    Due to the volatility and relatively low potential for 
bioaccumulation of these pollutants, air emissions are not expected to 
deposit on land or water and cause subsequent adverse health or 
ecosystem effects.
    The alternatives considered in the development of this regulation, 
including those alternatives selected as standards for new and existing 
elastomer sources, are based on process and emissions data received 
from every existing elastomer facility known to be in operation at the 
time of the initial data collection. During the development of today's 
rule, the EPA met with industry several times to discuss this data. In 
addition, facilities and State regulatory authorities had the 
opportunity to comment on draft versions of the proposed regulation and 
to provide additional information. The EPA published the proposed rule 
for comment on June 12, 1995 (60 FR 30801). The public comments that 
were received on the proposed rule are summarized in the Basis and 
Purpose Document for Final Standards, Summary of Public Comments and 
Responses (Docket Item No. V-C-1). These comments were considered, and 
in some cases, today's standards reflect these comments. Of major 
concern to commenters were the reporting and recordkeeping burden and 
the requirements for back-end process operations and wastewater 
control.
    The final standards give existing sources 3 years from the date of 
promulgation to comply. Subject to certain limited exceptions, this is 
the maximum amount of time allowed under the Clean Air Act. New sources 
are required to comply with the standard upon startup. The EPA believes 
these standards to be achievable for affected sources within the 
timeframes provided. The number of existing sources affected by this 
rule is less than 50; therefore, the EPA does not believe that required 
retrofits or other actions cannot be achieved in the time frame 
allotted.
    Included in the final rule are methods for determining initial 
compliance as well as monitoring, recordkeeping, and reporting 
requirements. All of these components are necessary to ensure that 
sources will comply with the standards both initially and over time. 
However, the EPA has made every effort to simplify the requirements in 
the rule. The Agency has also attempted to maintain consistency with 
existing regulations by either incorporating text from existing 
regulations or referencing the applicable sections, depending on which 
method would be least confusing for a given situation.
    As described in the ``Basis and Purpose Document for Proposed 
Standards'' (EPA-453/R-95-006a), regulatory alternatives were 
considered that included a combination of requirements equal to, and 
above, the MACT floor. Cost-effectiveness was a factor considered in 
evaluating options above the floor; in cases where options more 
stringent than the floor were selected, they were judged to have a 
reasonable cost effectiveness. For epichlorohydrin rubber (EPR), 
polybutadiene rubber (PBR)/styrene butadiene rubber (SBR) (by 
solution), and SBR (by emulsion) the estimated cost effectiveness was 
found to be relatively high at the MACT floor level due to the 
requirements for process back-end operations. However, the back-end 
provisions of the regulation contain several options for compliance 
that will allow facilities to select the most cost-effective option 
based on facility-specific considerations.
    Representatives from other interested EPA offices and programs are 
included in the regulatory development process as members of the Work 
Group. The Work Group is involved in the regulatory development 
process, and must review and concur with the regulation before proposal 
and promulgation. Therefore, the EPA believes that the implications to 
other EPA offices and programs have been adequately considered during 
the development of these standards.

B. Source of Authority

    National emission standards for new and existing sources of HAP 
established under section 112(d) reflect MACT or

    * * * the maximum degree of reduction in emissions of the HAP * 
* * that the Administrator, taking into consideration the cost of 
achieving such emission reduction, and any nonair quality health and 
environmental impacts and energy requirements, determines is 
achievable for new or existing sources in the category or 
subcategory to which such emission standard applies * * * (42 U.S.C. 
7412(d)(2)).

    For new sources, section 112(d)(3) provides that the standards for 
a source category or subcategory ``shall not be less stringent than the 
emission control that is achieved in practice by the best controlled 
similar source, as determined by the Administrator.'' Section 112(d)(3) 
provides further that for existing sources the standards shall be no 
less stringent than the average emission limitation achieved by the 
best performing 12 percent of the existing sources for source 
categories and subcategories with 30 or more sources or the average 
emission limitation achieved by the best performing 5 sources for 
source categories or subcategories with fewer than 30 sources. These 
two minimum levels of control define the MACT floor for new and 
existing sources.
    The regulatory alternatives considered in the development of this 
regulation, including those regulatory alternatives selected as 
standards for new and existing affected sources, are based on process 
and emissions data received from the existing plant sites known by the 
EPA to be in operation.
    As stated above, the MACT floor represents the least stringent 
standard permitted by law for new and existing sources. The EPA may 
establish standards more stringent than the MACT floor when it 
determines that such standards are achievable, ``taking into 
consideration the cost of achieving such emission reduction, and any 
nonair quality health and environmental impacts, and energy 
requirements'' (42 U.S.C. 7412(d)(2)). In a few instances, the 
standards in today's rule are more stringent than the MACT floor. In 
each case, the EPA determined, based on available data, that such 
standards were achievable within the meaning of section 112(d). Table 1 
shows the subcategory-specific instances where an option was selected 
that was more stringent than the MACT floor, along with the 
corresponding incremental cost-effectiveness from the MACT floor.

                       Table 1.--Incremental Cost Effectiveness Values of Regulatory Options More Stringent Than the MACT Floor a                       
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                           Incremental cost effectiveness b ($/Mg)                                      
                                    --------------------------------------------------------------------------------------------------------------------
            Subcategory                                         Front-end process                                                                       
                                             Storage                  vents             Back-end process          Wastewater          Equipment leaks   
--------------------------------------------------------------------------------------------------------------------------------------------------------
Butyl..............................  floor.................  $3,100................  floor................  $1,600...............  $1,700               

[[Page 46909]]

                                                                                                                                                        
Epichlorohydrin....................  floor.................  floor.................  floor................  floor................  $2,000               
Ethylene propylene.................  floor.................  floor.................  floor................  floor................  $2,000               
Halobutyl..........................  $300..................  $1,400................  floor................  floor................  $1,100               
Hypalon..................  floor.................  floor.................  floor................  floor................  floor                
Neoprene...........................  floor.................  $2,900................  floor................  floor................  c $1,600             
Nitrile butadiene latex............  floor.................  floor.................  floor................  floor................  c $2,600             
Nitrile butadiene rubber...........  floor.................  floor.................  floor................  floor................  c $1,200             
Polybutadiene/styrene butadiene      floor.................  floor.................  floor................  floor................  c $2,600             
 rubber by solution.                                                                                                                                    
Polysulfide........................  floor.................  floor.................  floor................  floor................  floor                
Styrene butadiene latex............  floor.................  floor.................  floor................  floor................  floor                
Styrene butadiene rubber by          floor.................  floor.................  floor................  floor................  floor                
 emulsion.                                                                                                                                              
--------------------------------------------------------------------------------------------------------------------------------------------------------
a In the table, ``floor'' indicates that the level of the promulgated standard is equivalent to the MACT floor.                                         
b The incremental cost effectiveness reflects the cost and emission reduction from the MACT floor to the level of the promulgated standard.             
c Equipment leak control programs at elastomer production facilities consisted of a complex combination of controls for the numerous components that can
  leak and cause HAP emissions. This complexity made it impractical to define a MACT floor ``program'' for which impacts could be assessed for multiple-
  plant subcategories. Therefore, the cost effectiveness values shown in the table represent the incremental cost effectiveness values from baseline.   

C. Technical Basis of Regulation

    Potential regulatory alternatives were developed based on the 
Hazardous Organic NESHAP (HON) (subparts F, G, and H of 40 CFR part 
63), and the Batch Processes Alternative Control Techniques (ACT) 
document (EPA 453/R-93-017; November 1993). The HON was selected as a 
basis for regulatory alternatives because: (1) The characteristics of 
the emissions from storage vessels, continuous front-end process vents, 
equipment leaks, and wastewater at Group I elastomer facilities are 
similar or identical to those addressed by the HON; and (2) the levels 
of control required under the HON were already determined through 
extensive analyses to be reasonable from a cost and impact perspective.
    Finally, the Batch Processes ACT was selected to identify 
regulatory alternatives for batch process vents, which are not 
addressed by the HON. The Batch Processes ACT addresses the control of 
VOC emissions, and all of the organic HAP identified for the Group I 
elastomers facilities are also VOC. Unlike the HON, the Batch Processes 
ACT is not a regulation and, therefore, does not specify a level of 
control that must be met. Instead, the Batch Processes ACT provides 
information on potential levels of control, their costs, etc. Based on 
the review of the Batch Processes ACT, the EPA selected a level of 
control equivalent to 90 percent reduction for batch front-end process 
vents. This level of control was selected for regulatory analysis 
purposes because it represents a reasonable level of control 
considering costs and other impacts.

D. Stakeholder and Public Participation

    In the development of this standard, numerous representatives of 
the elastomers industry were consulted. Industry representatives have 
included trade associations and elastomer producers responding to 
section 114 questionnaires and information collection requests (ICR's). 
The EPA also received input from representatives from State and 
Regional environmental agencies. Representatives from other interested 
EPA offices and programs participated in the regulatory development 
process as members of the Work Group. The Work Group is involved in the 
regulatory development process, and is given opportunities to review 
and comment on the standards before proposal and promulgation. 
Therefore, the EPA believes that the impact on other EPA offices and 
programs has been adequately considered during the development of these 
standards. In addition, the EPA has met with members of industry 
concerning these standards. Finally, industry representatives, 
regulatory authorities, and environmental groups had the opportunity to 
comment on the proposed standards and to provide additional information 
during the public comment period that followed proposal.
    The standards were proposed in the Federal Register on June 12, 
1995 (60 FR 30801). The preamble to the proposed standards described 
the rationale for the proposed standards. Public comments were 
solicited at the time of proposal. To provide interested persons the 
opportunity for oral presentation of data, views, or arguments 
concerning the proposed standards, a public hearing was offered at 
proposal. However, the public did not request a hearing and, therefore, 
one was not held. The public comment period was from June 12, 1995 to 
August 11, 1995. A total of twenty-nine comment letters were received. 
Commenters included industry representatives and State agencies. The 
comments were carefully considered, and changes were made in the 
proposed standards when determined by the EPA to be appropriate. A 
detailed discussion of these comments and responses can be found in the 
Basis and Purpose Document for Final Standards, which is referenced in 
the ADDRESSES section of this preamble. The summary of comments and 
responses in the Basis and Purpose Document for the Final Standards 
serves as the basis for the revisions that have been made to the 
standards between proposal and promulgation. Section IV of this 
preamble discusses some of the major changes made to the standards.

II. Summary of Promulgated Standards

    Emissions of specific organic HAP from the following types of 
emission points (i.e., emission source types) are being covered by the 
final standard: Storage vessels, continuous front-end process vents, 
batch front-end process vents, back-end processes operations, equipment 
leaks, and wastewater operations. The organic HAP emitted and required 
to be controlled by these standards vary by subcategory. Each of the 
twelve elastomer products constitutes a separate subcategory, each of 
which belongs to one of the nine

[[Page 46910]]

source categories regulated by these standards.
    The existing affected source is defined as each group of one or 
more EPPUs that manufacture the same elastomer product as their primary 
product, and (1) are located at a major source plant site, (2) are not 
exempt, and (3) are not part of a new affected source. This means that 
each plant site will have only one existing affected source in any 
given subcategory.
    If a plant site with an existing affected source producing 
elastomer A as its primary product constructs a new EPPU also producing 
elastomer A as its primary product, the new EPPU is a new affected 
source if the new EPPU has the potential to emit more than 10 tons per 
year of a single HAP, or 25 tons per year of all HAP. In this 
situation, the plant site would have an existing affected source 
producing elastomer A, and a new affected source producing elastomer A. 
Each subsequent new EPPU with potential HAP emissions above the levels 
cited above would be a separate new affected source.
    New affected sources are also created when an EPPU is constructed 
at a major source plant site where the elastomer product was not 
previously produced, with no regard to the potential HAP emissions from 
the EPPU. Another instance where a new affected source is created is if 
a new EPPU is constructed at a new plant site (i.e., green field site) 
that will be a major source. The final manner in which a new affected 
source is created is when an existing affected source undergoes 
reconstruction, thus making the previously existing source subject to 
new source standards.
    With relatively few exceptions, the final standards for storage 
vessels, continuous front-end process vents, equipment leaks, and 
wastewater streams are the same as those promulgated for the 
corresponding types of emission points at facilities subject to the 
HON. As shown in Tables 2 and 3, some subcategories have requirements 
that differ from the HON; these cases are designated by ``MACT Floor.'' 
These different requirements are specified in the final standards.
    As in the HON, if an emission point within an affected source meets 
the applicability criteria and is required to be controlled under the 
standard, it is referred to as a Group 1 emission point. If an emission 
point within the affected source is not required to apply controls, it 
is referred to as a Group 2 emission point.

A. Storage Vessel Provisions

    For all subcategories, the storage vessel requirements are 
identical to the HON storage vessel requirements in subpart G. A 
storage vessel means a tank or other vessel that is associated with an 
elastomer product process unit and that stores a liquid containing one 
or more organic HAP. The rule specifies assignment procedures for 
determining whether a storage vessel is associated with an elastomer 
product process unit. The storage vessel provisions do not apply to the 
following: (1) Vessels permanently attached to motor vehicles, (2) 
pressure vessels designed to operate in excess of 204.9 kpa (29.7 psia) 
and without emissions to the atmosphere, (3) vessels with capacities 
smaller than 38 m\3\ (10,000 gal), (4) vessels and equipment storing 
and/or handling material that contains no detectable organic HAP, and/
or organic HAP as impurities only, (5) surge control vessels and 
bottoms receiver tanks, and (6) wastewater storage tanks. An impurity 
is produced coincidentally with another chemical substance and is 
processed, used, or distributed with it.
    In addition to those vessels that do not meet the definition of 
storage vessels, the standards exempt certain storage vessels 
containing latex. Specifically, storage vessels containing a latex, 
located downstream of the stripping operations, all storage vessels 
containing styrene butadiene latex, and storage vessels containing 
styrene, acrylamide, and epichlorohydrin, are exempt from the storage 
vessel requirements of the final rule.
    The owner or operator must determine whether a storage vessel is 
Group 1 or Group 2; Group 1 storage vessels require control. The 
criteria for determining whether a storage vessel is Group 1 or Group 2 
are the same as the HON criteria.

                                           Table 2.--Summary of Final Standards for Existing Affected Sources                                           
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                 Level of final standard a                                              
                                  ----------------------------------------------------------------------------------------------------------------------
           Subcategory                                                                     Back-end process                                             
                                          Storage            Front-end process vents           emissions            Wastewater         Equipment leaks  
--------------------------------------------------------------------------------------------------------------------------------------------------------
BR, HBR..........................  HON.................  HON/ACT, exempting halogenated  no control..........  HON.................  HON.               
                                                          vent streams controlled by                                                                    
                                                          flare or boiler before June                                                                   
                                                          12, 1995.                                                                                     
EPI, HYP, NEO, NBL, NBR, PSR, SBL  HON.................  HON/ACT.......................  no control..........  HON.................  HON.               
EPR..............................  HON.................  HON/ACT, exempting halogenated  MACT floor residual   HON.................  HON.               
                                                          vent streams controlled by      HAP limit.                                                    
                                                          flare or boiler before June                                                                   
                                                          12, 1995.                                                                                     
PBR/SBRS, SBRE...................  HON.................  HON/ACT.......................  MACT floor residual   HON.................  HON.               
                                                                                          HAP limit.                                                    
--------------------------------------------------------------------------------------------------------------------------------------------------------
a HON=the level of the standard is equivalent to existing source provisions of subpart G of 40 CFR 63 for storage and wastewater, and subpart H of 40   
  CFR 63 for equipment leaks.                                                                                                                           
 HON/ACT=the level of the standard for continuous front-end process vents is equal to the existing source process vent provisions in subpart G of 40 CFR
  63, and the level of the standard for batch front-end process vents is equal to the 90 percent control level from the Batch Processes ACT.            


[[Page 46911]]



                                              Table 3.--Summary of Final Standards for New Affected Sources                                             
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                     Level of standard a                                                
                                    --------------------------------------------------------------------------------------------------------------------
            Subcategory                                         Front-end process       Back-end process                                                
                                             Storage                  vents                emissions              Wastewater          Equipment leaks   
--------------------------------------------------------------------------------------------------------------------------------------------------------
BR, EPI, HBR, HYP, NEO, NBL, NBR,    New source HON........  New source HON/ACT....  No control...........  Existing source HON..  New source HON       
 SBL.                                                                                                                                                   
EPR, PBR/SBRS, SBRE................  New source HON........  New source HON/ACT....  New source floor       Existing source HON..  New source HON       
                                                                                      residual HAP limit.                                               
--------------------------------------------------------------------------------------------------------------------------------------------------------
a HON=the level of the standard is equivalent to the provisions of subpart G of 40 CFR 63 for storage and wastewater, and subpart H of 40 CFR 63 for    
  equipment leaks.                                                                                                                                      
 HON/ACT=the level of the standard for continuous front-end process vents is equal to the new source process vent provisions in subpart G of 40 CFR 63, 
  and the level of the standard for batch front-end process vents is equal to the 90 percent control level from the Batch Processes ACT.                

    The storage provisions require that one of the following control 
systems be applied to Group 1 storage vessels: (1) An internal floating 
roof with proper seals and fittings; (2) an external floating roof with 
proper seals and fittings; (3) an external floating roof converted to 
an internal floating roof with proper seals and fittings; or (4) a 
closed vent system with a 95-percent efficient control device. The 
storage provisions give details on the types of seals and fittings 
required. Monitoring and compliance provisions include periodic visual 
inspections of vessels, roof seals, and fittings, as well as internal 
inspections. If a closed vent system and control device is used, the 
owner or operator must establish appropriate monitoring procedures. 
Reports and records of inspections, repairs, and other information 
necessary to determine compliance are also required by the storage 
provisions. No controls are required for Group 2 storage vessels.

B. Front-End Process Vent Provisions

    There are separate provisions in the rule for front-end process 
vents that originate from unit operations operated in a continuous 
mode, and those from unit operations operated in a batch mode. An 
affected source could be subject to both the continuous and batch 
front-end process vent provisions if front-end operations at an 
elastomer production process unit consist of a combination of 
continuous and batch unit operations. The continuous provisions would 
be applied to those vents from continuous unit operations, and the 
batch provisions to vents from batch unit operations.
1. Continuous Front-End Process Vent Provisions
    The provisions in the final rule for continuous front-end process 
vents are the same as the HON process vent provisions in subpart G. 
Continuous front-end process vents are gas streams that originate from 
continuously operated units in the front-end of an elastomer process, 
and include gas streams discharged directly to the atmosphere and gas 
streams discharged to the atmosphere after diversion through a product 
recovery device. The continuous front-end process vent provisions apply 
only to vents that emit gas streams containing more than 0.005 weight-
percent HAP.
    A Group 1 continuous front-end process vent is defined as a 
continuous front-end process vent with a flow rate greater than or 
equal to 0.005 scmm, an organic HAP concentration greater than or equal 
to 50 ppmv, and a total resource effectiveness (TRE) index value less 
than or equal to 1.0. The continuous front-end process vent provisions 
require the owner or operator of a Group 1 continuous front-end process 
vent stream to: (1) Reduce the emissions of organic HAP using a flare; 
(2) reduce emissions of organic HAP by 98 weight-percent or to a 
concentration of 20 ppmv or less; or (3) achieve and maintain a TRE 
index above 1. Performance test provisions are included for Group 1 
continuous front-end process vents to verify that the control device 
achieves the required performance.
    The organic HAP reduction is based on the level of control achieved 
by the reference control technology. Group 2 continuous front-end 
process vent streams with TRE index values between 1.0 and 4.0 are 
required to monitor those process vent streams to ensure those streams 
do not become Group 1, which require control.
    The owner or operator can calculate a TRE index value to determine 
whether each process vent is a Group 1 or Group 2 continuous front-end 
process vent, or the owner or operator can elect to comply directly 
with the control requirements without calculating the TRE index. The 
TRE index value is determined after the final recovery device in the 
process or prior to venting to the atmosphere. The TRE calculation 
involves an emissions test or engineering assessment and use of the TRE 
equations in Sec. 63.115 of subpart G.
    The rule encourages pollution prevention through product recovery 
because an owner or operator of a Group 1 continuous front-end process 
vent may add recovery devices or otherwise reduce emissions to the 
extent that the TRE becomes greater than 1.0 and the Group 1 continuous 
front-end process vent becomes a Group 2 continuous front-end process 
vent.
    Group 1 halogenated streams controlled using a combustion device 
must vent the emissions from the combustor to an acid gas scrubber or 
other device to limit emissions of halogens prior to venting to the 
atmosphere. The control device must reduce the overall emissions of 
hydrogen halides and halogens by 99 percent or reduce the outlet mass 
emission rate of total hydrogen halides and halogens to less than 0.45 
kg/hr.
    The rule exempts certain halogenated process vent streams from the 
requirement to control the halogens at the exit from a combustion 
device. Specifically, halogenated continuous front-end process vents at 
existing affected sources producing butyl rubber, halobutyl rubber, or 
ethylene-propylene rubber are exempt from the requirements to control 
hydrogen halides and halogens from the outlet of combustion devices. 
However, the rule requires that these vent streams be controlled in 
accordance with the other Group 1 requirements for continuous front-end 
process vents.
    Monitoring, reporting, and recordkeeping provisions necessary to 
demonstrate compliance are also included in the continuous front-end 
process vent provisions. Compliance with the monitoring provisions is 
based on a comparison of daily average monitored values to enforceable 
parameter ``levels'' established by the owner or operator.

[[Page 46912]]

2. Batch Front--End Process Vent Provisions
    Process vents that include gas streams originating from batch unit 
operations in the front-end of an elastomer product process unit are 
subject to the batch front-end process vent provisions of the rule. 
Consistent with provisions in the rule for other emission source types, 
batch front-end process vents are classified as Group 1 or Group 2, 
with control being required for Group 1 batch front-end process vents.
    An important aspect of the batch front-end process vent provisions 
is that applicability is on an individual vent basis. All batch 
emission episodes that are emitted to the atmosphere through the vent 
are to be considered in the group determination. The rule does not 
require that emissions from similar batch unit operations emitted from 
different vents be combined for applicability determinations. In other 
words, if a process included four batch reactors, and each reactor had 
a dedicated vent to the atmosphere, applicability would be determined 
for each reactor.
    The applicability criteria of the batch front-end process vent 
provisions are from the Batch Processes ACT, and are based on annual 
emissions of the HAP emitted from the vent, and the average flow rate 
of the vent stream. The vent stream characteristics are determined at 
the exit from the batch unit operation before any emission control or 
recovery device. The rule specifies that reflux condensers, condensers 
recovering monomer or solvent from a batch stripping operation, and 
condensers recovering monomer or solvent from a batch distillation 
operation are considered part of the unit operation. Therefore, the 
batch front-end process vent applicability criteria would be applied 
after these condensers.
    The first step in the applicability determination is to calculate 
the annual HAP emissions. Annual HAP emissions may be calculated using 
equations contained in the regulation (which are from the Batch 
Processes ACT). Testing or engineering assessment may also be used if 
the equations are not appropriate. Batch front-end process vents with 
annual HAP emissions less than 225 kilograms per year are exempt from 
all batch front-end process vent requirements, other than the 
requirement to estimate annual HAP emissions.
    There are two tiers of Group 2 batch front-end process vents. 
First, if the annual HAP emissions of a vent are below specified cutoff 
levels, the batch front-end process vent is classified as a Group 2 
vent, and a batch cycle limitation must be established (discussed 
below). The cutoff emission level is 11,800 kilograms HAP per year.
    If annual HAP emissions are greater than the cutoff emission level 
specified above, the owner must determine the annual average flow rate 
of the batch front-end process vent, and the ``cutoff flow rate'' using 
the equation in Sec. 63.488(f). The Group 1/Group 2 classification is 
then based on a comparison between the actual annual average flow rate, 
and the cutoff flow rate. If the actual flow rate is less than the 
calculated cutoff flow rate, then the batch process vent is a Group 1 
vent, and control is required. If the actual flow rate is greater than 
the calculated cutoff flow rate, then the batch process vent is a Group 
2 batch front-end process vent, and the owner or operator must 
establish a batch cycle limitation.
    Owners and operators of Group 2 batch front-end process vents must 
establish a batch cycle limitation that ensures that HAP emissions from 
the vent do not increase to a level that would make the batch front-end 
process vent Group 1. The batch cycle limitation is an enforceable 
restriction on the number of batch cycles that can be performed in a 
year. An owner or operator has two choices regarding the level of the 
batch cycle limitation. The limitation may be set to maintain emissions 
below the annual emission cutoff level listed above, or the limitation 
may be set to ensure that annual emissions do not increase to a level 
that makes the calculated cutoff flow rate increase beyond the actual 
annual average flow rate. The advantage to the first option is that the 
owner or operator would not be required to determine the annual average 
flow rate of the vent. A batch cycle limitation does not limit 
production to any previous production level, but is based on the number 
of cycles necessary to exceed one of the two batch front-end process 
vent applicability criteria discussed above.
    The batch front-end process vent provisions require the owner or 
operator of a Group 1 batch front-end process vent stream to: (1) 
Reduce the emissions of organic HAP using a flare or (2) reduce 
emissions of organic HAP by 90 weight-percent over each batch cycle 
using a control or recovery device. If a halogenated batch vent stream 
(defined as a vent that has a mass emission rate of halogen atoms in 
organic compounds of 3,750 kilograms per year or greater) is sent to a 
combustion device, the outlet stream must be controlled to reduce 
emissions of hydrogen halides and halogens by 99 percent. Control could 
be achieved at varying levels for different emission episodes as long 
as the required level of control for the batch cycle was achieved. The 
owner or operator could even elect to control some emission episodes 
and by-pass control for others. Performance test provisions are 
included for Group 1 batch front-end process vents to verify that the 
control device achieves the required performance.
    Monitoring, reporting, and recordkeeping provisions necessary to 
demonstrate compliance are also included in the batch front-end process 
vent provisions. These provisions are modeled after the analogous 
continuous process vent provisions in the HON. Compliance with the 
monitoring provisions is based on a comparison of batch cycle daily 
average monitored values to enforceable parameter monitoring levels 
established by the owner or operator.
    The provisions for batch front-end process vents contain three 
conditions that can greatly simplify compliance. First, an owner or 
operator can control a batch front-end process vent in accordance with 
the Group 1 batch front-end process vent requirements and bypass the 
applicability determination. Second, if a batch front-end process vent 
is combined with a continuous vent stream before a recovery or control 
device, the owner or operator is exempt from all batch front-end 
process vent requirements. However, applicability determinations and 
performance tests for the continuous vent must be conducted at 
conditions when the addition of the batch vent streams makes the HAP 
concentration in the combined stream greatest. Finally, if batch front-
end process vents combine to create a ``continuous'' flow to a control 
or recovery device, the less complicated continuous process vent 
monitoring requirements are used.

C. Back-End Process Provisions

    Back-end process operations include all operations at an EPPU that 
occur after the stripping operations. These operations include, but are 
not limited to, filtering, drying, separating, and other finishing 
operations, as well as product storage.
    The back-end process provisions contain residual HAP limitations 
for three subcategories: EPR, PBR/SBRS, and SBRE. The limitations for 
EPR and PBR/SBRS are in units of kilograms HAP per megagram of crumb 
rubber dry weight (crumb rubber dry weight means the weight of the 
polymer, minus the weight of water and residual organics), and the 
limitation for SBRE is in units of kilogram HAP per megagram latex.

[[Page 46913]]

The limitation is a monthly average weighted based on the weight of 
rubber or latex processed in the stripper. Two methods of compliance 
are available: (1) Stripping the polymer to remove the residual HAP to 
the levels in the standards, on a monthly weighted average basis, or 
(2) reducing emissions using add-on control to a level equivalent to 
the level that would be achieved if stripping was used.
1. Compliance Using Stripping Technology
    If stripping is the method of compliance selected, the rule allows 
two options for demonstrating compliance: by sampling and by monitoring 
stripper operating parameters. If compliance is demonstrated by 
sampling, samples of the stripped wet crumb or stripped latex must be 
taken as soon as safe and feasible after the stripping operation, but 
no later than the entry point for the first unit operation following 
the stripper (e.g., the watering screen), and analyzed to determine the 
residual HAP content. For styrene-butadiene rubber produced by the 
emulsion process, the sample of latex shall be taken just prior to 
entering the coagulation operations.
    A sample must be taken once per day for continuous processes, or 
once per batch for batch processes. The sample must be analyzed to 
determine the residual HAP content, and the corresponding weight of 
rubber or latex processed in the stripper must be recorded. This 
information is then used to calculate a monthly weighted average. A 
monthly weighted average that is above the limitation is a violation of 
the standard, as is a failure to sample and analyze at least 75 percent 
of the samples required during the month. The EPA is in the process of 
approving test methods that will be used to determine compliance with 
the standard. These methods are being promulgated separately by the 
EPA. Records of each test result would be required, along with the 
corresponding weight of the polymer processed in the stripper. Records 
of the monthly weighted averages must also be maintained.
    An owner or operator complying using stripping can also demonstrate 
compliance by continuously monitoring stripper operating parameters. If 
using this approach, the owner or operator must establish stripper 
operating parameters for each grade of polymer processed in the 
stripper, along with the corresponding residual HAP content of that 
grade. The parameters that must be monitored include, at a minimum, 
temperature, pressure, steaming rates (for steam strippers), and some 
parameter that is indicative of residence time. The HAP content of the 
grade must be determined initially using the residual HAP test methods 
discussed above. The owner or operator can elect to establish a single 
set of stripper operating parameters for multiple grades.
    The EPA believes that computer predictive modeling may be an 
attractive alternative to the periodic sampling and stripper parametric 
monitoring options in the rule, but did not specifically include 
provisions for these options, because the use of computer predictive 
modeling is so site-specific that it was not possible to include 
general requirements for its use in subpart U. However, the rule does 
allow the opportunity for site-specific approval of the use of computer 
predictive modeling, stack test monitoring, or other alternative means 
of compliance through the submittal of an alternative compliance plan.
    The difference in the demonstration of compliance by sampling, and 
the demonstration of compliance by monitoring stripping parameters, is 
that the monitoring option is entirely based on a grade or batch. To 
further explain, if a particular grade of polymer is processed in the 
stripper continuously for 32 hours, a sample of that grade is required 
to be taken each operating day, if the sampling compliance 
demonstration option is selected. However, if the stripping parameter 
monitoring option is selected, the entire length of time the grade is 
being processed in the stripper is treated as a single unit.
    During the operation of the stripper, the parameters must be 
continuously monitored, with a reading of each parameter taken at least 
once every 15 minutes. If, during the processing of a grade, all hourly 
average parameter values are in accordance with the established levels, 
the owner or operator can use the HAP content determined initially in 
the calculation of the monthly weighted average, and sampling is not 
required. However, if one hourly average value for any parameter is not 
in accordance with the established operating parameter, a sample must 
be taken and the HAP content determined using specified test methods.
    Records of the initial residual HAP content results, along with the 
corresponding stripper parameter monitoring results for the sample, 
must be maintained. The hourly average monitoring results are required 
to be maintained, along with the results of any HAP content tests 
conducted due to exceedance of the established parameter monitoring 
levels. Records must also be kept of the weight of polymer processed in 
each grade, and the monthly weighted average values.
    If complying with the residual HAP limitations using stripping 
technology, and demonstrating compliance by monitoring stripper 
parameters, there are three ways a facility can be in violation of the 
standard. First, a monthly weighted average that is above the 
limitation is a violation of the standard, as is a failure to sample 
and analyze a sample for a grade with an hourly average parameter value 
not in accordance with the established monitoring parameter levels. The 
third way for a facility to be out of compliance is if the stripper 
monitoring data are not sufficient for at least 75 percent of the 
grades produced during the month. Stripper data are considered 
insufficient if monitoring parameters are obtained for less than 75 
percent of the 15-minute periods during the processing of a grade.
2. Compliance Using Add-On Control
    If add-on control is the method of compliance selected, there are 
two levels of compliance. Initial compliance is based on a source test, 
and continuous compliance is based on the daily average of parameter 
monitoring results for the control or recovery device.
    The initial performance test must consist of three 1-hour runs or 
three complete batch cycles, if the duration of the batch cycle is less 
than 1 hour. The test runs must be conducted during processing of 
``worst-case'' grade, which means the grade with the highest residual 
HAP content leaving the stripper. The ``uncontrolled'' residual HAP 
content in the latex or wet crumb rubber must be determined, using the 
test methods, after the stripper. Then, when the crumb for which the 
uncontrolled residual HAP was determined is being processed in the 
back-end unit operation being controlled, the inlet and outlet 
emissions for the control or recovery device must be determined using 
Method 18 or Method 25A. The uncontrolled HAP content is then adjusted 
to account for the reduction in emissions by the control or recovery 
device, and compared to the levels in the standard. For initial 
compliance, the adjusted residual HAP content level for each test run 
must be less than the level in today's standards.
    During the initial test, the appropriate parameter must be 
monitored, and an enforceable ``level'' established as a maximum or 
minimum operating parameter based on this monitoring. As

[[Page 46914]]

with continuous front-end process vents, the level is established as 
the average of the maximum (or minimum) point values for the three test 
runs.
    Continuous monitoring must be conducted on the control or recovery 
device, and compliance is based on the daily average of the monitoring 
results. The monitoring, recordkeeping, and reporting provisions are 
the same as the process vent provisions in the HON, which are required 
for continuous front-end process vents in today's final standard.
3. Carbon Disulfide Limitations For Styrene Butadiene Rubber By 
Emulsion Producers
    Today's regulation would reduce carbon disulfide (CS2) 
emissions from styrene butadiene rubber producers using an emulsion 
process by limiting the concentration of CS2 in the dryer vent 
stacks to 45 ppmv. Sulfur-containing shortstopping agents used to 
produce certain grades of rubber have been determined to be the source 
of CS2 in the dryer stacks. Owners or operators would be required 
to develop standard operating procedures for each grade that uses a 
sulfur-containing shortstopping agent. These standard operating 
procedures would specify the type and amount of agent added, and the 
point in the process where the agent is added. One standard operating 
procedure can be used for more than one grade if possible.
    The owner or operator is required to validate each standard 
operating procedure through either a performance test or a 
demonstration using engineering assessment. The facility would be in 
compliance with this the regulation if the appropriate standard 
operating procedure is followed whenever a sulfur-containing 
shortstopping agent is used. Facilities that route dryer vents to a 
combustion device would be exempt from Sec. 63.500 of the regulation.

D. Wastewater Provisions

    Except for back-end wastewater streams originating from equipment 
that only produces latex products and back-end wastewater streams at 
affected sources that are subject to the residual organic HAP 
limitation, the standards require owners and operators to comply with 
the wastewater provisions in the HON. Owners and operators of new and 
existing sources are required to make a group determination for each 
wastewater stream based on the existing source applicability criteria 
in the HON: Flow rate and organic HAP concentration. The level of 
control required for Group 1 wastewater streams is dependent upon the 
organic HAP constituents in the wastewater stream.
    The standards also require owners and operators to comply with the 
maintenance wastewater requirements in Sec. 63.105 of subpart F. These 
provisions require owners and operators to include a description of 
procedures for managing wastewaters generated during maintenance in 
their startup, shutdown, and malfunction plan.

E. Equipment Leak Provisions

    For all subcategories, both existing and new affected sources are 
required to comply with the equipment leak standards specified in 
subpart H of 40 CFR part 63. In general, subpart H requires owners and 
operators to implement a leak detection and repair (LDAR) program, 
including various work practice and equipment standards. The subpart H 
standards are applicable to equipment in volatile HAP service for 300 
or more hours per year (hr/yr). The standards define ``in volatile 
organic HAP service'' as being in contact with or containing process 
fluid that contains a total of 5 percent or more total HAP. Equipment 
subject to the standards are: Valves, pumps, compressors, connectors, 
pressure relief devices, open-ended valves or lines, sampling 
connection systems, instrumentation systems, agitators, surge control 
vessels, bottoms receivers, and closed-vent systems and control 
devices.
    A few differences to the subpart H standards are contained in this 
final rule. These differences include not requiring the submittal of an 
Initial Notification or Implementation Plan and allowing 150 days 
(rather than 90 days) to submit the Notification of Compliance Status. 
In addition, the exemptions discussed earlier for storage vessels are 
also applicable for surge control vessels and bottoms receivers.
    Affected sources subject to today's final rule and currently 
complying with the NESHAP for Certain Processes Subject to the 
Negotiated Regulation for Equipment Leaks (40 CFR part 63, subpart I) 
are required to continue to comply with subpart I until the compliance 
date of this final rule, at which point in time they must comply with 
today's rule and are no longer subject to subpart I. Further, affected 
sources complying with subpart I through a quality improvement program 
are allowed to continue these programs without interruption as part of 
complying with today's rule. In other words, becoming subject to 
today's standards does not restart or reset the ``compliance clock'' as 
it relates to reduced burden earned through a quality improvement 
program.

F. Emissions Averaging Provisions

    The EPA is allowing emissions averaging among continuous front-end 
process vents, batch front-end process vents, aggregate batch vents, 
back-end process operations, storage vessels, and wastewater streams 
within an existing affected source. New affected sources are not 
allowed to use emissions averaging. Emissions averaging is not allowed 
between subcategories; it is only allowed between emission points 
within the same affected source. Under emissions averaging, a system of 
``credits'' and ``debits'' is used to determine whether an affected 
source is achieving the required emission reductions. Twenty emission 
points per plant site are allowed in the set of emissions averaging 
plans submitted for the plant site, with an additional 5 emission 
points allowed if pollution prevention measures are used.

G. Compliance and Performance Test Provisions and Monitoring 
Requirements

    Compliance and performance test provisions and monitoring 
requirements contained in the final standards are very similar to those 
found in the HON. Each type of emission point included in the standards 
is discussed briefly in the following paragraphs. Also, significant 
differences from the parameter monitoring requirements found in the HON 
are discussed.
1. Storage Vessels
    Monitoring and compliance provisions for storage vessel 
improvements include periodic visual inspections of vessels, roof 
seals, and fittings, as well as internal inspections. If a control 
device is used, the owner or operator must identify the appropriate 
monitoring procedures to be followed in order to demonstrate 
compliance. Monitoring parameters and procedures for many of the 
control devices likely to be used are identified in the final 
standards. Reports and records of inspections, repairs, and other 
information necessary to determine compliance are also required by the 
final standards.
2. Continuous Front-end Process Vents
    The final standards for continuous front-end process vents require 
the owner or operator to either calculate a TRE index value to 
determine the group status of each continuous front-end process vent or 
to comply with the control requirements. The TRE index value is 
determined after the last recovery device in the process or prior to 
venting to the atmosphere. The TRE calculation involves an emissions 
test or

[[Page 46915]]

engineering assessment and use of the TRE equations specified in the 
final standards.
    Performance test provisions are included for Group 1 continuous 
front-end process vents to verify that control devices or recovery 
achieve the required performance. Monitoring provisions necessary to 
demonstrate compliance are also included in the standards.
3. Batch Front-End Process Vents
    Similar to the provisions for continuous front-end process vents, 
there is a procedure for determining the group status of batch front-
end process vents. This procedure is based on annual emissions and 
annual average flow rate of the batch front-end process vent. Equations 
for estimating and procedures for measuring annual emissions and annual 
average flow rates are provided in the final standards. The use of 
engineering assessment for the group determination is also allowed.
    Performance test provisions are included for Group 1 batch front-
end process vents to verify that control devices achieve the required 
performance. Monitoring provisions necessary to demonstrate compliance 
are also included in the final standard.
    For Group 2 batch front-end process vents, the standard requires 
owners and operators to establish a batch cycle limitation. The batch 
cycle limitation restricts the number of batch cycles that can be 
accomplished per year. This enforceable limitation ensures that a Group 
2 batch front-end process vent does not become a Group 1 batch front-
end process vent as a result of running more batch cycles than 
anticipated when the group determination was made. The determination of 
the batch cycle limitation is not tied to any previous production 
amounts. An affected source may set the batch cycle limitation at any 
level it desires as long as the batch front-end process vent remains a 
Group 2 batch front-end process vent. Alternatively the standards would 
allow owners or operators to declare any Group 2 batch front-end 
process vent to be a Group 1 batch front-end process vent. In such 
cases, control of the batch process front-end vent is required.
4. Back-End Process Vents
    The final rule specifies the performance tests, test methods (with 
the exception of residual HAP reference test methods), and monitoring 
requirements necessary to determine that the allowed back-end emission 
limitations are achieved. The following paragraphs discuss each of 
these.
    Performance tests and test methods for residual HAP limitations. 
Initial performance tests, in the traditional sense, are required for 
facilities complying with the back-end operations provisions using add-
on control. Testing is required for all control and recovery devices, 
other than flares and certain boilers and process heaters. The back-end 
process provisions require the use of approved test methods.
    Initial tests are required for facilities complying by using 
stripper parameter monitoring. The purpose of this initial testing is 
to establish correlations between residual HAP contents and stripper 
operating parameters. Within a few months of the promulgation of this 
regulation, the EPA will promulgate test methods for determining the 
residual HAP content in crumb and latex.
    If an owner or operator complies with the back-end standards by 
sampling, periodic sampling and testing is required. The residual HAP 
test methods would also be used for these analyses.
    Performance tests and test methods for carbon disulfide emission 
limitations for SBRE facilities. Initial performance tests are one 
option for ``verifying'' each standard operating procedure as an 
acceptable procedure that results in carbon disulfide concentrations of 
45 ppmv or less in the dryer stacks at SBRE facilities. Standard 
operating procedures may also be verified through engineering 
assessments. If the performance testing option is selected, one 
performance test is required for each standard operating procedure. 
Method 18 or 25A is specified to measure the carbon disulfide 
concentration. Additional verifications are not required unless a new 
standard operating procedure is added, or an existing standard 
operating procedure is revised.
    Monitoring requirements. Control and recovery devices and strippers 
used to comply with the final rule need to be maintained and operated 
properly if the required level of control is to be achieved on a 
continuing basis. Monitoring of control and recovery device and 
stripper parameters can be used to ensure that such proper operation 
and maintenance are occurring.
    For control and recovery devices, the back-end process operation 
standard uses the same list of parameters discussed above for 
continuous front-end process vents. For strippers, the regulation 
requires the monitoring of temperature, pressure, steaming rates, and a 
parameter indicative of residence time.
5. Wastewater
    For demonstrating compliance with the various requirements, the 
final standard allows the owners or operators to either conduct 
performance tests or to document compliance using engineering 
calculations. Appropriate compliance and monitoring provisions are 
included in the final standard.
6. Equipment Leaks
    The final standard retains the use of Method 21 to detect leaks. 
Method 21 requires a portable organic vapor analyzer to monitor for 
leaks from equipment in use. A ``leak'' is a concentration specified in 
the regulation for the type of equipment being monitored and is based 
on the instrument response to methane (the calibration gas) in the air. 
The observed screening value may require adjustment for the response 
factor relative to methane if the weighted response factor of the 
stream exceeds a specified multiplier. The final rule requires the use 
of Method 18 or Method 25A to determine the organic content of a 
process stream. To test for leaks in a batch system, test procedures 
using either a gas or a liquid for pressure testing the batch system 
are specified to test for leaks.
7. Continuous Parameter Monitoring
    The final standards require owners or operators to establish 
parameter monitoring levels. The standards provide the owner or 
operator the flexibility to establish the levels based on site-specific 
information. Site-specific levels can best accommodate variation in 
emission point characteristics and control device designs. Three 
procedures for establishing these levels are provided in the final 
standards. They are based on performance tests; engineering 
assessments, performance tests, and/or manufacturer's recommendations; 
and engineering assessments and/or manufacturer's recommendations. 
While the establishment of a level based solely on performance tests is 
preapproved by the Administrator, values determined using the last two 
procedures, which may or may not use the results of performance tests, 
must be approved by the Administrator for each individual case.
    The final standards require the availability of at least 75 percent 
of monitoring data to constitute a valid day's worth of data for 
continuous and batch front-end process vents. Failure to have a valid 
day's worth of monitoring data is considered an excursion. The criteria 
for determining a valid day's or

[[Page 46916]]

hour's worth of data are provided in the final standards. A certain 
number of excused excursions have been allowed for in the final 
standards; these provisions are the same as the provisions in the HON. 
The standards allow a maximum of 6 excused excursions for the first 
semiannual reporting period, decreasing by 1 excursion each semiannual 
reporting period. Starting with the sixth semiannual reporting period 
(i.e., the end of the third year of compliance) and thereafter, 
affected sources are allowed one excused excursion per semiannual 
reporting period. As is always the case, a State has the discretion to 
impose more stringent requirements than the requirements of NESHAP and 
other federal requirements and could choose not to allow the excused 
excursion provisions contained in these final standards.

H. Recordkeeping and Reporting Provisions

    The final standards require owners or operators of affected sources 
to maintain required records for a period of at least 5 years. The 
final standards require that the following reports be submitted, as 
applicable: (1) Precompliance Report, (2) Emissions Averaging Plan, (3) 
Notification of Compliance Status report, (4) Periodic Reports, and (5) 
other reports (e.g., notifications of storage vessel internal 
inspections).
    Specific recordkeeping and reporting requirements are specified in 
each section that addresses an individual emission point (e.g., 
Sec. 63.486 for batch front-end process vents). The recordkeeping and 
reporting provisions related to the affected source as a whole (e.g., 
types of reports, such as the Notification of Compliance Status) are 
found in Sec. 63.506. For example, Sec. 63.491 requires an owner or 
operator to record the batch cycle limitation for each Group 2 batch 
front-end process vent. Section 63.492 goes on to require the owner or 
operator to submit this information in the Notification of Compliance 
Status as specified in Sec. 63.506. Finally, Sec. 63.506 requires 
submittal of the information specified in Sec. 63.492.

III. Summary of Impacts

    This section presents a summary of the air, non-air environmental 
(waste and solid waste), energy, cost, and economic impacts resulting 
from the control of HAP emissions under this final rule.

A. Facilities Affected by These NESHAP

    The promulgated rule would affect BR, EPI, EPR, HYP, NEO, NBR, PBR, 
PSR, and SBR facilities that are major sources in themselves, or that 
are located at a major source. Based on available information, all of 
the facilities at which these elastomers are produced were judged to be 
major sources for the purpose of developing these standards. (Final 
determination of major source status occurs as part of the compliance 
determination process undertaken by each individual source.)
    Impacts are presented relative to a baseline reflecting the level 
of control in the absence of the rule. The current level of control was 
well understood, because emissions and control data were collected on 
each facility included in the analysis. The impacts for existing 
sources were estimated by bringing each facility's control level up to 
today's standards.
    Impacts are not assessed for new sources because it was projected 
that no new sources are expected to begin operation through 1999. For 
more information on this projection, see the New Source Memo in the 
SID.

B. Primary Air Impacts

    Today's standards are estimated to reduce HAP emissions from all 
existing sources of listed elastomers by 6,400 Mg/yr. This represents a 
48 percent reduction from baseline. Table 4 summarizes the HAP emission 
reductions for each individual subcategory.

C. Other Environmental Impacts

    The total criteria air pollutant emissions resulting from process 
vent and wastewater control of today's standards are estimated to be 
around 178 Mg/yr, with NOX emissions from incinerators and boilers 
accounting for around 155 Mg/yr. Minimal wastewater or solid and 
hazardous waste impacts are projected.

D. Energy Impacts

    The total nationwide energy demands that would result from 
implementing the process vent and wastewater controls are around 1.10 
x  1012 Btu annually.

                                                     Table 4. HAP Emission Reduction by Subcategory                                                     
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                      HAP emission reduction (Mg/yr)                                    
                                                              ------------------------------------------------------------------------------  Percentage
                         Subcategory                                         Front-end     Back-end                                           reduction 
                                                                 Storage      process      process     Wastewater   Equipment      Total         from   
                                                                               vents      operations   operations     leaks                    baseline 
--------------------------------------------------------------------------------------------------------------------------------------------------------
Butyl rubber.................................................            0          211            0          102          293          606           64
Epichlorohydrin elastomer....................................            4            0            0            0          120          124           77
Ethylene propylene rubber....................................            2           85          979            0        1,020        2,012           62
Halobutyl rubber.............................................           62           38            0            0          233          335           26
HypalonTM....................................................            0            0            0            0            0            0            0
Neoprene.....................................................            0          258            0            0           96          354           48
Nitrile butadiene latex......................................            0            0            0           94           41          135           85
Nitrile butadiene rubber.....................................            1            0            0            0          364          365           62
Polybutadiene rubber/styrene butadiene rubber by solution....            0            0          882            0          637        1,519           44
Polysulfide rubber...........................................            0            0            0            0            0            0            0
Styrene butadiene latex......................................            0           22            0          272          332          627           44
Styrene butadiene rubber by emulsion.........................            0            0          195           48            0          243           23
Total--(percent of total reduction)..........................      69, (1)    615, (10)  2,056, (32)     516, (8)  3,136, (49)        6,392           48
--------------------------------------------------------------------------------------------------------------------------------------------------------

E. Cost Impacts

    Cost impacts include the capital costs of new control equipment, 
the cost of energy (supplemental fuel, steam, and electricity) required 
to operate control equipment, operation and maintenance costs, and the 
cost savings generated by reducing the loss of valuable product in the 
form of emissions. Also, cost impacts include the costs of monitoring, 
recordkeeping, and reporting associated with today's standards. Average 
cost

[[Page 46917]]

effectiveness ($/Mg of pollutant removed) is also presented as part of 
cost impacts and is determined by dividing the annual cost by the 
annual emission reduction. Table 5 summarizes the estimated capital and 
annual costs and average cost effectiveness by subcategory.
    Under the promulgated rule, it is estimated that total capital 
costs for existing sources would be $26 million (1989 dollars), and 
total annual costs would by $18.4 million (1989 dollars) per year. It 
is expected that the actual compliance cost impacts of the rule would 
be less than presented because of the potential to use common control 
devices, upgrade existing control devices, use other less expensive 
control technologies, implement pollution prevention technologies, or 
use emissions averaging. Because the effect of such practices is highly 
site-specific and data were unavailable to estimate how often the lower 
cost compliance practices could be utilized, it is not possible to 
quantify the amount by which actual compliance costs would be reduced.

                                      Table 5. Summary of Regulatory Costs                                      
----------------------------------------------------------------------------------------------------------------
                                                                                 TAC b--    AER c--(Mg/ CE d--($/
                                                                   TCI a--      (1000$/yr)      yr)        Mg)  
-------------------------------------------------------------------(1000$)--------------------------------------
Butyl.........................................................          691          1,316        606      2,200
Epichlorohydrin...............................................          491            241        124      1,900
Ethylene Propylene............................................        5,854          3,506      2,012      1,700
Halobutyl.....................................................          328            322        335      1,000
Hypalon.............................................            0              0          0        N/A
Neoprene......................................................          560            897        354      2,500
Nitrile butadiene latex.......................................          465            243        135      1,800
Nitrile butadiene rubber......................................          397            444        365      1,200
Polybutadine/styrene butadiene rubber by solution.............       11,780          8,335      1,519    e 5,500
Polysulfide...................................................            0              0          0        N/A
Styrene butadiene latex.......................................        1,480          1,028        627      1,600
Styrene butadiene rubber by emulsion..........................        3,942          2,112        243     e8,700
----------------------------------------------------------------------------------------------------------------
a ``TCI'' represents Total Capital Investment.                                                                  
b ``TAC'' represents Total Annualized Cost, including the monitoring, recordkeeping, and reporting cost.        
c ``AER'' represents the Annual Emission Reduction.                                                             
d ``CE'' represents Cost-Effectiveness.                                                                         
e This cost-effectiveness is primarily due to the high costs estimated to control back-end process emissions to 
  the MACT floor level. The costs developed are costs for incineration devices to sufficient back-end vents so  
  that emissions will be reduced to a level equivalent to the level achieved by meeting the residual HAP limit  
  by stripping. Extrapolation of industry estimates of the cost of enhanced stripping place the cost of enhanced
  stripping as low as 10 percent of the cost of incineration.                                                   

F. Economic Impacts

    Economic impacts for the regulatory alternatives analyzed at 
proposal show that the estimated price increases for the affected 
chemicals range from 0.2 percent for nitrile butadiene latex (NBL) to 
2.5 percent for BR. Estimated decreases in production range from 0.7 
percent for NBL to 5.0 percent for BR. With the reduced estimate in 
costs from proposal, the economic impacts of the final rule should be 
lower than those estimated at proposal. No closures of facilities are 
expected as a result of the standard.
    Three aspects of the analysis are likely to lead to an overestimate 
of the impacts. First, the economic analysis model assumes that all 
affected firms compete in a national market, though in reality some 
firms may be protected from competitors by regional or local trade 
barriers. Second, facilities with the highest control cost per unit of 
production are assumed to also have the highest baseline production 
costs per unit. This assumption may not always be true, because the 
baseline production costs per unit are not known, and thus, the 
estimated impacts, particularly for the smaller firms, may be too high. 
Finally, economic impacts may be overstated, because the alternative 
for halobutyl rubber and butyl rubber that was used in this analysis is 
more stringent and more costly than the selected regulatory 
alternative.
    For more information regarding the impacts of the final standards, 
consult the Basis and Purpose Document (see the Supplementary 
Information section near the beginning of the preamble).

IV. Significant Comments and Changes to the Proposed Standards

    In response to comments received on the proposed standards, changes 
have been made to the final standards. While several of these changes 
are clarifications designed to make the EPA's intent clearer, a number 
of them are significant changes to the requirements of the proposed 
standards. A summary of the substantive comments and/or changes made 
since the proposal are described in the following sections. The 
rationale for these changes and detailed responses to public comments 
are included in the Basis and Purpose Document for the final standards. 
Additional information is contained in the docket for these final 
standards (see ADDRESSES section of this preamble).
    National Emission Standards for Hazardous Air Pollutant Emissions 
from the Production of Acrylonitrile Butadiene Styrene (ABS) Resin, 
Styrene Acrylonitrile (SAN) Resin, Methyl Methacrylate Acrylonitrile 
Butadiene Styrene (MABS) Resin, Methyl Methacrylate Butadiene Styrene 
(MBS) Resin, Polystyrene Resin, Poly(ethylene terephthalate) (PET) 
Resin, and Nitrile Resin (Group IV Polymers and Resins) (40 CFR part 
63, subpart JJJ), were developed concurrently with subpart U. Many of 
the basic requirements of the two rules are alike, and in some cases 
they are identical. Subpart V was proposed on March 29, 1995, and 
comments from the public were received. In many instances, similar 
comments were received on analogous sections of subparts U and V. In 
these instances, the responses to comments and appropriate rule changes 
were coordinated. However, in some instances, comments were received on 
subpart V, and not on subpart U, that were applicable to provisions of 
subpart U. A summary of these comments can be found in the ``Hazardous 
Air Pollutant Emissions from Process Units in the Thermoplastics 
Manufacturing Industry--Basis and Purpose Document for Final Standards, 
Summary of Public Comments and Responses'' (EPA-453/R-96-001b, May 
1996; Docket Number

[[Page 46918]]

A-92-45, Item Number V-C-1). In a few cases, the EPA decided that a 
change to subpart U based on these comments was appropriate. These 
changes did not result in a change in the stringency of the subpart U 
provisions, but were typically changes to improve the clarity of the 
rule. The one area where a subpart V comment resulted in a tangible 
change to subpart U was in the batch vent applicability determination; 
that is, an affected source is allowed to determine the group status of 
a batch front-end process vent based on its primary product.

A. Applicability Provisions and Definitions

1. Designation of Affected Source and the Definition of EPPU
    Commenters expressed confusion about the definitions of affected 
source and EPPU in the proposed rule. The EPA reviewed both definitions 
and agreed the definitions needed clarification. Therefore, the EPA has 
revised the language describing affected source and EPPU in the final 
rule. The definition of affected source has been clarified, as 
discussed in section II and paragraph A.3 of this section.
    The definition of EPPU was revised and now includes a list of the 
equipment that comprises an EPPU. Because wastewater operations are 
ancillary equipment and are often used by more than one EPPU and may be 
used by more than one affected source, they are not included as part of 
the EPPU.
2. Definition of Organic HAP
    Numerous commenters recommended that the EPA restrict the list of 
organic HAP in the final rule to those that are used or are present in 
significant quantities at EPPUs or those that are listed in the HON, 
subpart F, table 2. The EPA agreed with the commenters that a table 
providing a listing of the specific organic HAP expected to be 
regulated for each subcategory covered by the rule should be included 
in the final rule. Therefore, the definition of organic HAP was revised 
to specify those organic HAP known to be used or present in significant 
quantities for each subcategory. This list is provided in table 7 of 
the final rule.
    This revised definition of organic HAP was developed using 
available process description information received from industry and 
gathered from available literature. Because there may be additional 
organic HAP present at an affected source, the final rule requires 
owners or operators to notify the EPA of the presence of any additional 
organic HAP based on the following criteria: (1) Organic HAP is 
knowingly introduced into the manufacturing process, or has been or 
will be reported under any Federal or State program, such as TRIS or 
Title V; and (2) Organic HAP is presented in Table 2 of subpart F.
3. Determining New Source Status
    The EPA received comments regarding the process for determining if 
new or existing source requirements would apply to a particular EPPU. 
In response to those comments, the EPA has revised the provisions in 
the final standards. Under the final standards, new affected sources 
are created under each of the following four situations: (1) If a plant 
site with an existing affected source producing an elastomer product as 
its primary product constructs a new EPPU also producing the same 
elastomer product as it primary product, the new EPPU is a new affected 
source if the new EPPU has the potential to emit more than 10 tons per 
year of a single HAP, or 25 tons per year of all HAP; (2) when an EPPU 
is constructed at a major source plant site where the elastomer product 
was not previously produced; (3) if a new EPPU is constructed at a new 
plant site (i.e., green field site) that will be a major source; and 
(4) when an existing affected source undergoes reconstruction, thus 
making the previously existing source subject to new source standards.
    This approach to defining a new affected source was selected in 
order to make subpart U more consistent with the HON. This standard 
differs from the HON, however, in that it applies to multiple source 
categories. Thus, unlike the HON, a newly added EPPU at a facility is 
covered by this rule even if that EPPU is in a different source 
category from the existing EPPUs at the facility. It is the EPA's 
position that the addition of a process unit in a different source 
category is a new source and must meet the requirements for new sources 
even though the EPPU may have the potential to emit less than 10 tons 
per year of a single HAP or 25 tons per year of all HAP. Indeed, if a 
source covered by another MACT standard (i.e., a different source 
category) were built at a HON facility, that source would be subject to 
the new source requirements under that MACT standard.
4. Flexible Operation Units
    The final rule has retained the HON concept of flexible operation 
units, but the language in the final rule has been significantly 
modified to more adequately address polymer production facilities. The 
final provisions require flexible operation units with an elastomer as 
the primary product to commit to complying with the elastomers rule at 
all times, regardless of what product they are producing at any 
particular time. The primary product for a flexible operation unit is 
determined based on projected production for the next 5 years.

B. Storage Vessel Provisions

    In comments received on the storage tank provisions, the EPA noted 
a common misinterpretation of the proposed regulation related to the 
distinction between a ``storage vessel'' and a ``surge control 
vessel''. The EPA determined that many of the comments received on 
``storage vessels'' were in fact referring to vessels that fall under 
the definition of surge control vessel. The EPA suggests that owners 
and operators of facilities subject to subpart U pay careful attention 
to these definitions.
1. Applicability Requirements
    Several comments were received requesting that the EPA consider the 
exemption of vessels storing specific HAP or products. In fact, one 
commenter indicated that the EPA should conduct a full floor analysis 
for new and existing storage vessels, considering each chemical 
separately and the various sizes of tanks for each subcategory. Other 
commenters supported the exemption of stripped latex storage tanks from 
control requirements, but also declared that high conversion SBR or 
polybutadiene latex storage tanks should also be exempt. Another 
commenter stated that tanks downstream of EPR stripping operations 
should be exempt from storage vessel requirements, just as those 
containing latex downstream of stripping operations are exempt.
    The EPA does not believe that the floor analyses for each HAP 
stored at elastomer production facilities are required to be conducted 
under the Act, nor should they be conducted. The Act requires the EPA 
to set emission standards for HAP on a source category (or subcategory) 
basis; it does not compel the EPA to establish separate control 
measures for each HAP emitted by a source in the category. As suggested 
by the commenter, this approach could result in an incomplete standard, 
since it would not include a standard for a listed HAP that may be used 
in the future by elastomer facilities. Further, consideration of 
individual HAP storage vessel controls would not be representative of 
facility-wide storage vessel control levels.

[[Page 46919]]

    However, the EPA believes that it is reasonable to exempt a storage 
vessel from the final regulation when it is clear that the vessel would 
never be a Group 1 storage vessel. The EPA determined that the 
following HAP used in the elastomer industry have low enough vapor 
pressures that vessels storing these HAP would never be Group 1: 
acrylamide, epichlorohydrin, and styrene. Therefore, the final rule 
exempts storage vessels containing these HAP at existing sources. This 
exemption is also extended to surge control vessels and bottoms 
receivers at existing sources.
    In addition, the EPA is convinced that an SBL storage vessel (high 
conversion or otherwise) would never contain sufficient HAP to exceed 
the vapor pressure cutoff for Group 1 storage vessels. This is 
primarily due to the low vapor pressure of styrene. Therefore, the 
final rule exempts all SBL storage vessels, surge control vessels, and 
bottoms receivers from the requirements of Secs. 63.484 and 63.502.
    Finally, the EPA agrees that storage vessels, surge control 
vessels, and bottoms receivers downstream of stripping operations at 
ethylene-propylene rubber facilities that are in compliance with the 
provisions of Sec. 63.494 through the use of stripping technology 
should be exempt from the storage vessel, surge control vessel, and 
bottoms receiver requirements. Further, the EPA believes that these 
exemptions should also extend to the other subcategories required to 
comply with the residual organic HAP limitations in Sec. 63.494(a)(1)-
(3). However, since the residual organic HAP content of rubber leaving 
the stripping operations at ethylene propylene rubber and 
polybutadiene/ styrene-butadiene rubber by solution facilities 
complying with these provisions through the use of add-on control is 
not restricted, these exemptions are not available to these facilities.
2. Emission Limits
    Commenters requested that the regulation allow the use of 
alternative storage vessel/surge control vessel control techniques. Two 
commenters described specific control systems present at their 
facilities, and asked that the EPA include allowances for these systems 
in the rule. They stressed that such allowances should consider the 
overall effectiveness of the control system, and not just the 
efficiency of the control or recovery device.
    The EPA agrees that it is reasonable to consider the overall 
effectiveness of a control ``system'' in determining compliance with 
the rule, and that such systems that have been demonstrated to be 
equivalent to the reference control technology should be allowed. While 
the EPA believes the system described by the commenter could be 
demonstrated to be equivalent to the reference control technology for 
surge control vessels, the commenter did not provide sufficient 
documentation to allow a complete evaluation of equivalence.
    However, the EPA maintains that subpart U, as proposed, already 
provides the opportunity for the commenter, as well as other elastomer 
production facilities, to demonstrate equivalency of alternative 
control techniques. For storage vessels, Sec. 63.121 of subpart G 
addresses the procedures to obtain approval of alternative means of 
emission limitations. For surge control vessels and bottoms receivers, 
these procedures are contained in Sec. 63.177 of subpart H. In summary, 
these sections specify that the owner or operator must submit 
documentation of the equivalency determination to the Administrator.

C. Continuous Front-end Process Vent Provisions

1. Applicability Requirements
    Several commenters stated that the exemption from halide controls 
for butyl/halobutyl production should be extended to all rubber 
manufacturers, since halogen-containing compounds or by-products have 
historically been routed to flares. Another commenter agreed with the 
exemptions for butyl and halobutyl production facilities, but pointed 
out that this exemption should only be applicable to existing sources.
    Only one existing facility was identified in each the halobutyl and 
the butyl rubber subcategories. At both of these facilities, 
halogenated vent streams were vented to a flare and/or boiler. Since 
both of these subcategories were single-facility subcategories, the 
MACT floor was determined to be the existing level of control. The EPA 
examined the impacts of requiring halogenated vent streams at the 
halobutyl and butyl rubber facilities to comply with the proposed 
requirements for all other elastomer subcategories (i.e, the HON-level 
of control). The EPA concluded that the costs associated with this 
level of control were not reasonable, given the associated emission 
reduction. Therefore, the proposed regulation allowed halogenated 
streams at halobutyl and butyl rubber facilities that were routed to a 
flare or boiler prior to proposal to continue to be controlled with 
these combustion devices, without additional control for the resulting 
halides.
    Prior to proposal, the EPA was aware of one EPR facility that also 
routed a halogenated vent stream to a boiler. However, since only one 
of five EPR facilities reported this situation, the EPA concluded that 
this level of control was not the MACT floor for EPR. Other EPR 
producers claimed that they also had halogenated streams at their 
facilities, but none offered any information to quantify the amount of 
halogens in the stream to determine if the streams could be classified 
as halogenated.
    After proposal, the EPA learned that chlorinated organic compounds 
are present in streams at all of the EPR facilities. These compounds 
are a by-product of the polymerization reaction, resulting from a 
chlorinated catalyst. At all four of the facilities contacted, the 
streams containing the chlorinated compounds are routed to either a 
flare or boiler. Due to the widely varying concentration in the stream, 
all facilities indicated that it was difficult, if not impossible, to 
accurately determine the halogen atom concentration in the vent stream. 
However, all expressed confidence that at times, the halide threshold 
in the incoming stream was exceeded.
    Therefore, the EPA concluded that four of the five EPR facilities 
have halogenated streams that are routed to either a boiler or flare. 
For this reason, the EPA has determined that the floor for EPR is the 
existing level of control for these halogenated vent streams. In 
addition, as with halobutyl and butyl rubber, the EPA does not believe 
that it would be cost-effective to require new incinerators and 
scrubbers to be installed at these facilities, when the only net 
emission reduction would be the reduction of the hydrochloric acid, 
since the reduction of the halogenated organic compound in the 
incinerator would be the same as was already being achieved in the 
boiler or flare. However, as noted above, sufficient stream-specific 
information was not available to conduct this analysis. Therefore, the 
final rule has been changed to extend the exemption for existing 
halogenated streams routed to a boiler or flare to EPR producers. 
Further, the final rule specifies that this exemption does not apply to 
new sources.
2. Emission Limits
    Based on a commenter's request, the final rule exempts a vent 
stream routed to an internal combustion engine as primary fuel from 
source testing requirements. The final rule also requires that the on/
off status of internal

[[Page 46920]]

combustion be monitored as a means of demonstrating compliance with 
these control requirements.

D. Batch Front-End Process Vent Provisions

    Commenters believed that batch front-end process vent provisions 
were inappropriate and unnecessarily burdensome. Several commenters 
disagreed with the EPA's reliance on the Batch Processes ACT document 
in the development of the batch vent provisions, claiming that it was 
not appropriate to the elastomer manufacturing industry.
    The EPA believes that the potential for HAP emissions from batch 
operations at elastomer production facilities warrant control. While 
the EPA disagrees with the statement that the provisions are 
inappropriate, the EPA agrees with comments regarding the complexity of 
the proposed batch vent provisions. Therefore, in the final rule these 
provisions were simplified. Many of these changes are discussed below.
    In response to comments on the batch front-end process vent 
applicability provisions, the volatility class concept has been 
eliminated. The Batch Processes ACT developed an annual threshold 
emission level for each of three volatility classes. The EPA initially 
judged that selection of a single annual threshold emission level would 
not be appropriate and included all three levels in the proposed 
standards. However, upon further review, the EPA found no adverse 
impact would result from the use of a single annual threshold emission 
level and, indeed, the final standards have been significantly 
simplified. Besides removing the requirement to determine the 
volatility class, the final standards contain only one equation for 
determining the cutoff flow rate (Sec. 63.488(f)) which is the last 
step in the group determination process.
    A commenter on the proposed Polymers and Resins IV (40 CFR part 63, 
subpart V) regulation suggested changing the batch vent group 
determination provisions to only utilize emissions data from an EPPU's 
primary product. The EPA agreed that to base the group determination on 
a single product could, if appropriately applied, provide acceptable 
results from an environmental perspective, while simplifying the 
compliance requirements for and improving the enforceability of the 
batch front-end process vent standards. Therefore, the final standards 
contain provisions allowing the owner or operator of an affected source 
to perform the group determination for batch front-end process vents 
based on annualized production of a single batch product. However, the 
EPA does not consider it to be appropriate from an environmental 
perspective to allow anything other than the worst-case HAP emitting 
batch product to be considered when basing applicability on a single 
product. Therefore, the final standards specify that the worst-case HAP 
emitting batch product be used when an owner or operator chooses to 
annualize a single product for purposes of determining applicability. 
The final standards define the worst-case HAP emitting product and 
describe how emissions are to be annualized to represent full-time 
production, where full-time production does not necessarily mean 
operating at maximum production rate. Since the proposed batch vent 
provisions were similar between subparts U and V, the EPA decided that 
this change was also appropriate for subpart U.
    Several commenters stated that the proposed provisions for the 
methods allowed for the calculation of batch front-end process vent 
emissions were overly restrictive. The proposed rule required that 
emissions be calculated using either the emission estimation equations 
or source testing. If the owner or operator could demonstrate that both 
the equations and source testing were inappropriate, then they were 
allowed to use engineering assessment to calculate HAP emissions. The 
commenters believed that an affected source should be allowed to use 
engineering assessments without having to demonstrate that source 
testing was inappropriate.
    The EPA maintains that it is imperative that a consistent technique 
for the estimation of batch front-end process vent emissions be used, 
which is provided through the emission estimation equations. The EPA 
believes the data required to use the batch front-end process vent 
emissions estimation equations should be obtainable with reasonable 
effort. The final standards continue to require use of the emissions 
estimation equations, unless the owner or operator can demonstrate that 
these equations are inappropriate.
    However, the EPA has concluded that direct measurement of emissions 
through testing may prove to be difficult and may or may not provide an 
increased assurance of accuracy over the use of engineering assessment. 
Therefore, if an owner or operator can demonstrate that the emissions 
estimation equations are not appropriate, the final standards allow the 
selection of either direct measurement or engineering assessment. 
Further, criteria for demonstrating that the emissions estimation 
equations are not appropriate to a specific batch emissions episode 
have been added to the final standards. These criteria require either: 
(1) The availability of test data that demonstrate a greater than 20 
percent discrepancy between the test value and the estimated value, or 
(2) that the owner or operator demonstrate to the Administrator that 
the emissions estimation equations are not appropriate for a given 
batch emissions episode.

E. Back-End Process Operation Provisions

    The back-end process operation provisions received the majority of 
the comments on the proposed rule. Significant comments were received 
on practically every aspect of these provisions. Following is a summary 
of the comments that resulted in notable changes to the back-end 
process operation requirements.
1. Averaging Period
    Several commenters declared that compliance based on a weekly 
average HAP limitation was unreasonable, and that compliance should be 
demonstrated on the basis of a monthly (or 30-day) rolling average 
instead. These commenters claimed that requiring compliance based on a 
weekly average fails to provide adequate operational flexibility for 
manufacturers to produce different grades of polymers in accordance 
with customer demands.
    Upon investigation of this issue, the EPA concluded that a monthly 
averaging period for the residual HAP limitations was more appropriate. 
Changing to a monthly averaging period would provide more operational 
flexibility to elastomer producers, while maintaining the same annual 
emission reduction.
2. Residual Organic HAP Limitations
    Commenters objected to numerous aspects of the residual organic HAP 
limitations. Most of these comments were directed towards the methods 
used to determine the back-end MACT floors. Discussed below are 
comments on definitions, test methods, and other areas that affect the 
determination of the residual organic HAP limitations. The EPA 
addressed these comments and re-assessed the MACT floors.
    Definition of crumb rubber dry weight. Comments stated that, for 
solution processes, the definition of ``crumb rubber dry weight'' 
should not exclude extender oils and carbon black for compliance 
purposes, because these are an integral part of the polymer. The EPA 
agrees with these comments, and has

[[Page 46921]]

revised the definition of crumb rubber dry weight to reflect this 
decision.
    Residual organic HAP test methods. Concurrent with the proposal of 
subpart U, the EPA proposed three residual HAP test methods--one each 
for SBRE, PBR/SBRS, and EPR. Several commenters stated that no single 
analytical method would produce consistent results for all polymers, 
and consequently, each company should be allowed to demonstrate 
compliance using a company-specific method that is comparable to the 
EPA test method.
    After careful review and consideration of this issue, the EPA 
agreed with the commenters and has undergone an extensive effort to 
rectify this situation. The EPA concluded that it was appropriate to 
allow every interested company to validate their own test method using 
a modified version of 40 CFR part 63, appendix A, Method 301.
    A total of nine test methods were submitted (three for EPR, three 
for SBRE, and three for PBR/SBRS). The modified Method 301 analysis 
performed allows each company to validate their own test method, and 
seven of the ten affected companies have done so. Therefore, each 
source has a compliance method available for determining residual HAP. 
The EPA believes that it would be helpful if the industry had access to 
all validated test methods, and is in the process of reviewing the 
methods and validation data that were submitted, and has preliminarily 
indicated that approval of all nine methods is anticipated. The EPA 
intends to promulgate these methods as appendix A Methods 310 a, b, and 
c for EPR, Methods 312 a, b, and c for SBRE, and Methods 313 a, b, and 
c for PBR/SBRS. However, since the approval and subsequent promulgation 
of the methods has not yet occurred, this final rule does not stipulate 
the methods to be used to determine residual organic HAP. Upon 
promulgation of these methods, the Agency will propose modifications to 
subpart U to specify that these methods be used to determine residual 
organic HAP.
    Furthermore, the affected industry has been intimately involved 
with all activity associated with the EPA's promulgation of the 
residual organic HAP test methods. The EPA held meetings with industry 
representatives to discuss their comments on the proposed methods, and 
to discuss procedures for validating company test methods. Every 
company that was expected to be subject to the back-end residual 
organic HAP limitations was invited to these meetings. As noted above, 
a total of nine test methods were submitted. These methods were from 
seven companies, leaving only three affected companies that decided not 
to submit methods. Representatives of each of those three companies 
which did not submit test methods were in attendance at one or more of 
the meetings and are therefore knowledgeable about the test methods. 
Since industry's submittal of the test methods, the EPA has worked 
closely with industry representatives to finalize the methods. 
Therefore, the EPA contends that all affected companies should be well 
aware of the methods that will be promulgated.
    As noted earlier, the final approval of these test methods is 
upcoming. It is anticipated that these methods will be promulgated in 
the autumn of 1996. The EPA does not believe that the interval between 
the promulgation of subpart U and the promulgation of these residual 
organic HAP test methods impairs the ability of any source to comply 
with the requirements by the specified compliance date. This is the 
case because affected sources are not required to be in compliance 
until three years after promulgation of the rule.
    MACT floor determination. Commenters indicated that the selection 
of a MACT floor ``somewhere between the mean, median, and mode'' did 
not represent central tendency. They maintained that a mean is the 
correct approach for establishing the MACT floor. The EPA agreed that 
one measure of central tendency should be used to establish the average 
and decided that the mean was the most appropriate measure for the 
residual organic HAP limitations floor determinations. In some 
situations, the use of the mean can result in a floor level of control 
that is not represented by any available control technology. However, 
this did not apply to this situation, where the emissions used to 
determine the floor were a result of process-specific stripping 
techniques, and not specific add-on control technologies.
    For EPR and PBR/SBRS, commenters stated that combining data 
received from different companies using different sampling and 
analytical methods, without establishing whether the methods achieve 
comparable results, was not an appropriate way to establish residual 
HAP limits. The commenters stated that if production figures and dryer 
stack testing results were used to establish these limits, these 
results cannot be equated to those from crumb sampling at the EPA's 
designated sampling point, because there are numerous potential 
emission sources between the proposed sampling point and the stack 
testing locations. In addition, commenters indicated that the proposed 
limitation did not recognize the fact that residual HAP may remain in 
the polymer after finishing. Finally, the commenters also stated that 
using annual emissions and limited weekly data to establish weekly 
limits is inherently uncertain, and may have resulted in an 
inappropriate standard.
    In the original MACT floor analyses, the EPA presumed that the 
back-end emission factor calculated from the reported emissions and 
production was equivalent to the residual HAP levels in the crumb 
leaving the stripping operations. Inherent in this analysis was the 
assumption that the companies reported total HAP emissions from all 
back-end emission sources, rather than only a portion of these sources.
    Upon receipt of these comments, the EPA again contacted each EPR 
and PBR/SBRS production facility to (1) verify the emissions numbers 
used to determine the back-end emission factor, (2) discuss the 
correlation of the methods used to estimate the original emission 
estimates and the residual organic HAP test methods undergoing 
validation, (3) determine the appropriate production, including oil 
extender weight, to use in determining the emission factor, (4) obtain 
information related to residual HAP remaining in the product after 
finishing, and (5) obtain short-term residual HAP information to be 
used in the adjustment of annual emissions to monthly.
    After obtaining this information, the EPA recalculated the MACT 
floors for each subcategory. It should be noted that only one facility 
indicated that the original emission estimates were calculated in a 
manner that was inconsistent with the residual organic HAP test 
methods. Two PBR/SBRS companies and one EPR company provided detailed 
short-term residual HAP data to allow the conversion of the annual data 
to a monthly limit. The resulting monthly limits were 8 kg/Mg for EPR 
and 10 kg/Mg for PBR/SBRS.
    While no comments were received criticizing the MACT floor analysis 
for SBRE, the change to a monthly average limit resulted in a change in 
the SBRE limit. In the determination of the original SBRE back-end MACT 
floor, residual HAP data were used from three of the four facilities. 
The fourth facility provided residual HAP data, but it was in a monthly 
average format and could not be used in the determination of a weekly 
limit. However, the change to a monthly limit meant that the data from 
this facility could also be used, resulting in a monthly limit of 0.4 
kg styrene per

[[Page 46922]]

Mg latex leaving the stripping operation for existing SBRE sources.
3. Monitoring Requirements
    Several comments were received regarding the proposed crumb and 
latex sampling requirements. In both instances, the EPA decided that 
the changes suggested by the commenters were technically appropriate, 
and they did not result in any detrimental environmental impact.
    Specifically, commenters found the requirement to sample ``before 
any opportunity for emissions to the atmosphere'' to be either 
infeasible or unsafe for PBR/SBRS and EPR and suggested modifications 
to the proposed sampling provisions. In response to these comments, the 
final rule states that PBR/SBRS or EPR crumb samples must be taken ``as 
soon as safe and feasible after the stripping operation, but no later 
than the entry point for the first unit operation following the 
stripper (e.g., the dewatering screen).''
    For SBRE, commenters pointed out that a more logical sampling 
location for determining the initial HAP concentration in the SBL is 
the mixed latex in the storage tank feeding the coagulator (rather than 
directly after the stripper). The EPA agreed with these comments, and 
the final rule has revised the SBL sampling location to be ``prior to 
any coagulation operations.''
    Comments were also received opposing the proposed crumb or latex 
sampling frequency provisions. Commenters believed that it is 
impractical to take a rubber sample each operating day for every grade 
of elastomer produced, because of the time required to reach 
representative operating conditions and to run an accurate analytical 
test. Suggested alternatives included one test per day, one test per 
``campaign,'' daily sampling that is reduced to weekly sampling upon 
demonstration of daily compliance, and daily sampling with the 
exception of grades produced for less than 4 hours in a day. Since the 
variability of the residual HAP contents between elastomer grades is 
relatively small, and since production schedules typically produce very 
similar grades of polymer for extended periods of time, the EPA 
concluded that reducing the sampling frequency to once per day for 
continuous processes would greatly simplify the rule, while still 
ensuring that practically all grades of elastomer are represented by 
such sampling. This change is reflected in the final rule.
    Some commenters were concerned that compliance would be based on 
one sample per day, and requested that an owner or operator be allowed 
to sample crumb or latex more frequently, and include the residual 
organic HAP results of these samples in the average. While the EPA 
believes that the proposed rule did not preclude a company from using 
more than one sample per day in determining the (weekly) average, the 
EPA has revised the language in the final rule to make this opportunity 
clearer.
    Several commenters stated that the rule should provide an allowance 
for missed or invalid crumb or latex samples. The proposed rule 
designated the failure to collect any single sample as an excursion. 
These commenters suggested that the EPA should require 75 percent of 
samples to be collected.
    The EPA recognizes that a number of circumstances could occur that 
cause a sample not to be analyzed in accordance with the rule. These 
may be in the form of sampling system malfunctions, mis-analysis, or 
other problems. The EPA realizes that there are unique challenges 
associated with the sampling of solid polymer, and agrees that problems 
could occur that would cause a sample to be missed. The EPA also 
recognizes that some of the test methods being validated to analyze the 
residual organic HAP in the crumb take long periods of time to perform, 
meaning that the opportunity to obtain a second sample may not be 
available if a mis-analysis in the laboratory occurs. While the EPA 
expects that sound company procedures could eliminate most of these and 
other problems, the EPA agrees that it is unreasonable to expect that 
no problems would ever occur that result in a missed sample. Therefore, 
an excursion for back-end process operations is defined in the final 
rule as when either (1) the monthly weighted average is above the 
applicable limit, or (2) when less than 75 percent of the required 
samples are taken, analyzed, and included in the monthly average.
    At proposal, the EPA specifically requested comments on the 
feasibility of the use of computer predictive modeling as an 
alternative to the daily crumb or latex sampling, or the stripper 
parametric monitoring compliance alternatives. Numerous commenters 
supported the allowance of such systems, while other expressed 
reservations. While the EPA believes that computer predictive modeling 
may be an attractive alternative to the periodic sampling and stripper 
parametric monitoring compliance options, the EPA is convinced that the 
use of computer predictive modeling is so site-specific that it is not 
possible to include general requirements for the use of such a system 
in subpart U. Nevertheless, the EPA believes that facilities should 
have the opportunity to utilize techniques that are equivalent to the 
two options of compliance provided in the proposed rule for facilities 
using stripping technology. Therefore, the EPA has included a third 
option that provides the opportunity for the site-specific approval of 
alternative means of compliance through the submittal of an alternative 
compliance plan.

F. Wastewater Operations Provisions

    Several commenters pointed out that the wastewater provisions of 
subpart G that are referenced in Sec. 63.501 of subpart U are the 
subject of litigation brought by the Chemical Manufacturers' 
Association against the EPA. Consequently, sources subject to these 
provisions cannot know what the final wastewater provisions, proposed 
to be incorporated into subpart U, will be. These commenters believed 
that the EPA should ``reserve'' the provisions of Sec. 63.501 pending 
the outcome of the litigation.
    As part of the HON litigation proposal, the EPA will request 
comments specific to the elastomers rule. If comments specific to the 
elastomers rule are received they will be addressed as part of the HON 
rulemaking actions or in actions specific to the elastomers rule, 
depending on the comments. Therefore, the comment period for this rule 
will not be reopened.
    The EPA believes that the wastewater provisions and the other HON 
provisions should be referenced in the elastomers rule so that final 
resolutions of the HON litigation will be automatically included in the 
elastomers rule. However, changes made to the HON will be evaluated by 
the EPA for applicability to this rule. The ``automatic'' part refers 
to the fact that text changes will not need to be made to this rule 
once the EPA, following notice and an opportunity for comment, finds 
the HON changes to be applicable. If the EPA determines that any 
changes to the HON are not applicable to this rule, the elastomers rule 
will be revised accordingly.
    Comments were received that the VOHAP threshold for regulation of 
new source wastewater streams (10 ppmw) was too restrictive, and that 
the EPA has not provided an economic justification regarding the 
achievability of the limit. Another comment was received stating that 
many elastomer product process wastewater streams will have VOHAP 
concentrations less than 50 ppmw, and monitoring and recordkeeping 
requirements are not needed for these streams. This comment recommended 
that the EPA exempt from regulation

[[Page 46923]]

``any process stream at an affected source with an average flow rate of 
less than 0.02 liters per minute or an average VOHAP concentration of 
less than 50 ppmw.''
    The EPA evaluated the new source MACT floor determinations for 
wastewater, and determined that no facility in any subcategory reported 
wastewater controls equivalent to the new source levels. In fact, no 
facility-wide wastewater controls greater than the existing source HON 
limitations were reported. Therefore, the EPA believes that this 
comment is valid, and has changed the final rule so that the new 
sources are subject to the same wastewater requirements as existing 
sources.
    In the proposed rule, the definition of ``wastewater'' stated that 
a stream must contain at least 5 ppmw of VOHAP and have a flow rate of 
0.02 liter per minute. Given the change in the definition of a Group 1 
wastewater stream for new sources, the EPA believes that it is 
reasonable to revise the definition of wastewater in accordance with 
the commenter's suggestion and therefore the wastewater definition has 
been revised in the final rule.

G. Equipment Leak Provisions

    One commenter requested that the proposed rule include an exclusion 
for reciprocating pumps that must leak small quantities of product to 
lubricate and cool the shaft and seal areas. The EPA agrees that an 
exemption for the situation described by the commenter is reasonable. 
The EPA reached a similar conclusion in the proposed Polymers and 
Resins IV regulation (subpart V). Therefore, Sec. 63.502(d) has been 
added to the final rule that exempts these reciprocating pump systems.
    Several commenters stated that 3 years should be allowed for 
compliance with equipment leak provisions for compressors (instead of 6 
months) under certain circumstances. The EPA agrees with the 
commenters, and has amended the compliance schedule for compressors in 
the following situations: (1) Existing reciprocating compressors which 
would require design modifications to connect to a closed-vent or 
recovery system; and (2) systems where existing compressors would be 
replaced.

H. Emissions Averaging Provisions

    Several commenters requested that batch front-end process vents be 
eligible to average emissions. The EPA had not allowed emissions 
averaging of batch front-end process vents at proposal because the EPA 
considered the accuracy and consistency needed for emissions averaging 
to be greater than that needed for applicability determinations. 
However, upon reconsideration, the EPA determined that the accuracy and 
consistency needs of emissions averaging could be met by applying a 
``discount'' factor (10 percent) to calculated emissions or by 
requiring direct measurement of emissions. Therefore, the final rule 
allows emissions averaging of existing batch front-end process vents.

I. Monitoring

    Many commenters requested that the proposed rule allow excused 
excursions in the same way that the HON rule allows excused excursions. 
In the final rule, the EPA decided to excuse a certain number of 
excursions for each reporting period. This decision was based on data 
and information presented during public comment on the HON and 
reiterated in public comments received on this rule, and during 
industry meetings held subsequent to proposal that indicated that a 
certain number of excursions could be expected even with properly 
operated pollution control devices. The EPA also concluded that not 
allowing excused excursions would impose significant additional capital 
and operating costs on the affected source for only negligible 
corresponding reductions in air emissions. As is always the case, a 
State has the discretion to impose more stringent requirements than the 
requirements of NESHAP and other Federal requirements and could choose 
not to allow the excused excursion provisions of this rule.
    The EPA considered the number of excused excursions that would be 
most appropriate for this standard and determined that the number of 
excursions allowed in the HON would be reasonable. Therefore, the final 
provisions allow a maximum of 6 excused excursions for the first 
semiannual reporting period, decreasing by 1 excursion each semiannual 
reporting period. Starting with the sixth semiannual reporting period 
(i.e., the end of the third year of compliance) and thereafter, 
affected sources are allowed one excused excursion per semiannual 
reporting period.

J. Recordkeeping and Reporting

    Several commenters stated that the recordkeeping and reporting 
requirements of the proposed rule were extremely burdensome and 
requested that the EPA reduce the burden. The EPA reexamined the 
recordkeeping and reporting requirements of the rule after proposal and 
determined that burden reductions were warranted. The EPA considers the 
recordkeeping and reporting requirements of the final rule the minimum 
necessary to ensure compliance with the final standards. The following 
changes were made to reduce the recordkeeping and reporting burden:
    (1) The requirement to submit an Initial Notification has been 
eliminated;
    (2) The requirement to submit an Implementation Plan has been 
eliminated;
    (3) The requirement to record monitored parameters every 15 minutes 
has been removed. The final rule requires hourly recording of monitored 
parameters in place of the 15 minute records required in the proposed 
rule.
    Although the above changes will reduce the burden on industry, the 
level of this reduction was not quantified.

V. Administrative Requirements

A. Docket

    The docket is an organized and complete file of all the information 
submitted to or otherwise considered by the EPA in the development of 
the final standards. The principal purposes of the docket are:
    (1) To allow interested parties to readily identify and locate 
documents so that they can intelligently and effectively participate in 
the rulemaking process; and
    (2) To serve as the record in case of judicial review (except for 
interagency review materials as provided for in section 307(d)(7)(A)).

B. Executive Order 12866

    Under Executive Order 12866 (58 FR 5173 (October 4, 1993)), the EPA 
must determine whether the regulatory action is ``significant'' and 
therefore subject to Office of Management and Budget (OMB) review and 
the requirements of the Executive Order. The Executive Order defines 
``significant regulatory action'' as one that is likely to result in 
standards that may:
    (1) Have an annual effect on the economy of $100 million or more or 
adversely affect, in a material way, the economy, a sector of the 
economy, productivity, competition, jobs, the environment, public 
health or safety, or State, local, or tribal governments or 
communities;
    (2) Create a serious inconsistency or otherwise interfere with an 
action taken or planned by another agency;
    (3) Materially alter the budgetary impact of entitlement, grants, 
user fees, or loan programs or the rights and obligations of recipients 
thereof; or
    (4) Raise novel legal or policy issues arising out of legal 
mandates, the

[[Page 46924]]

President's priorities, or the principles set forth in the Executive 
Order.
    Pursuant to the terms of the Executive Order, the OMB has notified 
the EPA that it considers this a ``significant regulatory action'' 
within the meaning of the Executive Order. The EPA submitted this 
action to the OMB for review. Changes made in response to suggestions 
or recommendations from the OMB were documented and included in the 
public record.

C. Paperwork Reduction Act

    The information collection requirements for this NESHAP have been 
submitted for approval to the Office of Management and Budget (OMB) 
under the Paperwork Reduction Act, 44 U.S.C. 3501 et seq. An 
Information Collection Request (ICR) document has been prepared by the 
EPA (ICR No. 1746.01), and a copy may be obtained from Sandy Farmer, 
OPPE Regulatory Information Division (2137), U.S. Environmental 
Protection Agency, 401 M Street, SW., Washington, DC 20460, or by 
calling (202) 260-2740.
    The public recordkeeping and reporting burden for this collection 
of information is estimated to average approximately 587 hours per 
respondent for each of the first 3 years following promulgation of the 
rule. These estimates include time for reviewing instructions, 
searching existing data sources, gathering and maintaining the data 
needed, and completing and reviewing the collection of information.
    Send comments regarding the recordkeeping and reporting burden 
estimate or any other aspect of this collection of information, 
including suggestions for reducing this burden, to Chief, Information 
Policy Branch (2137), U.S. Environmental Protection Agency, 401 M 
Street, SW., Washington, DC 20460; and to the Office of Information and 
Regulatory Affairs, Office of Management and Budget, Washington, DC 
20503, marked ``Attention: Desk Officer for EPA.''

D. Regulatory Flexibility Act

    The EPA has determined that it is not necessary to prepare a 
regulatory flexibility analysis in connection with this final rule. The 
EPA has also determined that this rule will not have a significant 
adverse economic impact on a substantial number of small businesses. 
Consistent with Small Business Administration (SBA) size standards, an 
elastomer producing firm is classified as a small entity if it has less 
than 750 employees and is unaffiliated with a larger domestic entity. 
Based upon this standard, three of the eighteen elastomer producing 
firms are classified as small entities (i.e., having fewer than 750 
employees). The EPA determined that annual compliance costs as a 
percentage of sales are less than one percent for all of the small 
entities affected by this regulation. This does not qualify as a 
significant economic impact on a substantial number of small 
businesses.

E. Small Business Regulatory Enforcement Fairness Act of 1996 (SBREFA)

    Pursuant to Subtitle E of SBREFA, this rule, which is nonmajor, was 
submitted to Congress before publication in the Federal Register.

F. Unfunded Mandates

    Under section 202 of the Unfunded Mandates Reform Act of 1995 
(``Unfunded Mandates Act''), signed into law on March 22, 1995, the EPA 
must prepare a budgetary impact statement to accompany any proposed or 
final standards that include a Federal mandate that may result in 
estimated costs to State, local, or tribal governments, or to the 
private sector, of, in the aggregate, $100 million or more. Under 
section 205, the EPA must select the most cost effective and least 
burdensome alternative that achieves the objectives of the standard and 
is consistent with statutory requirements. Section 203 requires the EPA 
to establish a plan for informing and advising any small governments 
that may be significantly or uniquely impacted by the standards.
    The EPA has determined that the final standards do not include a 
Federal mandate that may result in estimated costs of, in the 
aggregate, $100 million or more to either State, local, or tribal 
governments, or to the private sector, nor do the standards 
significantly or uniquely impact small governments, because they 
contain no requirements that apply to such governments or impose 
obligations upon them. Therefore, the requirements of the Unfunded 
Mandates Act do not apply to this final rule.

List of Subjects in 40 CFR Part 63

    Environmental protection, Air pollution control, Hazardous 
substances, Reporting and recordkeeping requirements.

    Dated: July 15, 1996.
Fred Hansen,
Acting Administrator.

    For the reasons set out in the preamble, part 63 of title 40, 
chapter I of the Code of Federal Regulations is amended as follows:

PART 63--NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS 
FOR AFFECTED SOURCE CATEGORIES

    1. The authority citation for part 63 continues to read as follows:

    Authority: 42 U.S.C. 7401, et seq.

    2. Part 63 is amended by adding subpart U to read as follows:
Subpart U--National Emission Standards for Hazardous Air Pollutant 
Emissions: Group I Polymers and Resins
Sec.
63.480  Applicability and designation of affected sources.
63.481  Compliance schedule and relationship to existing applicable 
rules.
63.482  Definitions.
63.483  Emission standards.
63.484  Storage vessel provisions.
63.485  Continuous front-end process vent provisions.
63.486  Batch front-end process vent provisions.
63.487  Batch front-end process vents--reference control technology.
63.488  Methods and procedures for batch front-end process vent 
group determination.
63.489  Batch front-end process vents--monitoring requirements
63.490  Batch front-end process vents--performance test methods and 
procedures to determine compliance.
63.491  Batch front-end process vents--recordkeeping requirements.
63.492  Batch front-end process vents--reporting requirements.
63.493  Standards for back-end processes.
63.494  Back-end process provisions--residual organic HAP 
limitations.
63.495  Back-end process provisions--procedures to determine 
compliance using stripping technology.
63.496  Back-end process provisions--procedures to determine 
compliance using control or recovery devices.
63.497  Back-end process provisions--monitoring provisions for 
control and recovery devices.
63.498  Back-end process provisions--recordkeeping.
63.499  Back-end process provisions--reporting.
63.500  Back-end process provisions--carbon disulfide limitations 
for styrene butadiene rubber by emulsion processes.
63.501  Wastewater provisions.
63.502  Equipment leak provisions.
63.503  Emissions averaging provisions.
63.504  Additional test methods and procedures.
63.505  Parameter monitoring levels and excursions.
63.506  General recordkeeping and reporting provisions.

[[Page 46925]]

Subpart U--National Emission Standards for Hazardous Air Pollutant 
Emissions: Group I Polymers and Resins


Sec. 63.480   Applicability and designation of affected sources.

    (a) Definition of affected source. The provisions of this subpart 
apply to each affected source. An affected source is either an existing 
affected source or a new affected source. Existing affected source is 
defined in paragraph (a)(1) of this section, and new affected source is 
defined in paragraph (a)(2) of this section. The affected source also 
includes all wastewater streams and wastewater operations associated 
with the elastomer product process unit(s) (EPPUs) included in the 
affected source.
    (1) Except as specified in paragraphs (b) through (d) of this 
section, an existing affected source is defined as each group of one or 
more EPPUs that is not part of a new affected source, as defined in 
paragraph (a)(2) of this section, and that is manufacturing the same 
primary product and located at a plant site that is a major source.
    (2) Except as specified in paragraphs (b) through (d) of this 
section, a new affected source is defined as a source meeting the 
criteria of paragraph (a)(2)(i), (a)(2)(ii), or (a)(2)(iii) of this 
section.
    (i) At a plant site previously without HAP emission points, each 
group of one or more EPPUs manufacturing the same primary product that 
is part of a major source on which construction commenced after June 
12, 1995,
    (ii) An EPPU meeting the criteria in paragraph (i)(1)(i) of this 
section, or
    (iii) A reconstructed affected source meeting the criteria in 
paragraph (i)(2)(i) of this section.
    (b) EPPUs exempted from the affected source. EPPUs that do not use 
any organic HAP may be excluded from the affected source, provided that 
the owner or operator complies with the requirements of paragraphs 
(b)(1) and (b)(2) of this section, if requested to do so by the 
Administrator.
    (1) Retain information, data, and analyses used to document the 
basis for the determination that the EPPU does not use any organic HAP. 
Types of information that could document this determination include, 
but are not limited to, records of chemicals purchased for the process, 
analyses of process stream composition, or engineering calculations.
    (2) When requested by the Administrator, demonstrate that the EPPU 
does not use any organic HAP.
    (c) Emission points exempted from the affected source. The affected 
source does not include the emission points listed in paragraphs (c)(1) 
through (c)(6) of this section:
    (1) Stormwater from segregated sewers;
    (2) Water from fire-fighting and deluge systems in segregated 
sewers;
    (3) Spills;
    (4) Water from safety showers;
    (5) Vessels and equipment storing and/or handling material that 
contains no organic HAP or organic HAP as impurities only; and
    (6) Equipment that is intended to operate in organic HAP service 
for less than 300 hours during the calendar year.
    (d) Processes exempted from the affected source. The processes 
specified in paragraphs (d)(1) through (d)(3) of this section are not 
part of the affected source.
    (1) Research and development facilities;
    (2) Equipment that is located within an EPPU that is subject to 
this subpart but does not contain organic HAP; and
    (3) Solvent reclamation, recovery, or recycling operations at 
hazardous waste treatment, storage, and disposal facilities (TSDF) 
requiring a permit under 40 CFR part 270 that are separate entities and 
not part of an EPPU to which this subpart applies.
    (e) Applicability determination of elastomer equipment included in 
a process unit producing a non-elastomer product. If an elastomer 
product that is subject to this subpart is produced within a process 
unit that is subject to subpart V of this part, and at least 50 percent 
of the elastomer is used in the production of the product manufactured 
by the subpart V process unit, the unit operations involved in the 
production of the elastomer are considered part of the process unit 
that is subject to subpart V, and not this subpart.
    (f) Primary product determination and applicability. The primary 
product of a process unit shall be determined according to the 
procedures specified in paragraphs (f)(1) and (f)(2) of this section. 
Paragraphs (f)(3) through (f)(4) of this section describe whether or 
not a process unit is subject to this subpart. Paragraphs (f)(5) 
through (f)(7) of this section discuss compliance for those EPPUs 
operated as flexible operation units, as specified in paragraph (f)(2) 
of this section.
    (1) If a process unit only manufactures one product, then that 
product shall represent the primary product of the process unit.
    (2) If a process unit is designed and operated as a flexible 
operation unit, the primary product shall be determined as specified in 
paragraphs (f)(2)(i) or (f)(2)(ii) of this section based on the 
anticipated operations for the 5 years following September 5, 1996 for 
existing affected sources and for the first 5 years after initial 
startup for new affected sources.
    (i) If the flexible operation unit will manufacture one product for 
the greatest operating time over the five-year period, then that 
product shall represent the primary product of the flexible operation 
unit.
    (ii) If the flexible operation unit will manufacture multiple 
products equally based on operating time, then the product with the 
greatest production on a mass basis over the five-year period shall 
represent the primary product of the flexible operation unit.
    (3) If the primary product of a process unit is an elastomer 
product, then that process unit is considered an EPPU. If that EPPU 
meets all the criteria of paragraph (a) of this section, it is either 
an affected source or is part of an affected source comprised of other 
EPPU subject to this rule at the same plant site with the same primary 
product. The status of a process unit as an EPPU, and as an affected 
source or part of an affected source shall not change regardless of 
what products are produced in the future by the EPPU, with the 
exception noted in paragraph (f)(3)(i) of this section.
    (i) If a process unit terminates the production of all elastomer 
products and does not anticipate the production of any elastomer 
product in the future, the process unit is no longer an EPPU and is not 
subject to the provisions of this subpart after notification is made as 
specified in paragraph (f)(3)(ii) of this section.
    (ii) The owner or operator of a process unit that wishes to remove 
the EPPU designation from the process unit, as specified in paragraph 
(f)(3)(i) of this section, shall notify the Administrator. This 
notification shall be accompanied by rationale for why it is 
anticipated that no elastomer products will be produced in the process 
unit in the future.
    (iii) If a process unit meeting the criteria of paragraph (f)(3)(i) 
of this section begins the production of an elastomer product in the 
future, the owner or operator shall use the procedures in paragraph 
(f)(4)(i) of this section to determine if the process unit is re-
designated as an EPPU.
    (4) If the primary product of a process unit is not an elastomer 
product, then that process unit is not an affected source, nor is it 
part of any affected source subject to this rule. The process unit is 
not subject to this rule at any time, regardless of what product is 
being produced. The status of the process unit

[[Page 46926]]

as not being an EPPU, and therefore not being an affected source or 
part of an affected source subject to this subpart, shall not change 
regardless of what products are produced in the future by the EPPU, 
with the exception noted in paragraph (f)(4)(i) of this section.
    (i) If, at any time beginning September 5, 2001, the owner or 
operator determines that an elastomer product is the primary product 
for the process unit based on actual production data for any preceding 
consecutive five-year period, then the process unit shall be classified 
as an EPPU. If an EPPU meets all the criteria in paragraph (a) of this 
section, it is either an affected source or part of an affected source 
and shall be subject to this rule.
    (ii) If a process unit meets the criteria of paragraph (f)(4)(i) of 
this section, the owner or operator shall notify the Administrator 
within 6 months of making this determination. The EPPU, as the entire 
affected source or part of an affected source, shall be in compliance 
with the provisions of this rule within 3 years from the date of such 
notification.
    (iii) If a process unit is re-designated as an EPPU but does not 
meet all the criteria of paragraph (a) of this section, the owner or 
operator shall notify the Administrator within 6 months of making this 
determination. This notification shall include documentation justifying 
the EPPU's status as not being an affected source or not being part of 
an affected source.
    (5) Once the primary product of a process unit has been determined 
to be an elastomer product and it has been determined that all the 
criteria of paragraph (a) of this section are met for the EPPU, the 
owner or operator of the affected source shall comply with the 
standards for the primary product. Owners or operators of flexible 
operation units shall comply with the standards for the primary product 
as specified in either paragraph (f)(5)(i) or (f)(5)(ii) of this 
section, except as specified in paragraph (f)(5)(iii) of this section.
    (i) Each owner or operator shall determine the group status of each 
emission point that is part of that flexible operation unit based on 
emission point characteristics when the primary product is being 
manufactured. Based on this finding, the owner or operator shall comply 
with the applicable standards for the primary product for each emission 
point, as appropriate, at all times, regardless of what product is 
being produced.
    (ii) Alternatively, each owner or operator shall determine the 
group status of each emission point that is part of the flexible 
operation unit based on the emission point characteristics when each 
product produced by the flexible operation unit is manufactured, 
regardless of whether the product is an elastomer product or not. Based 
on these findings, the owner or operator shall comply with the 
applicable standards, as appropriate, regardless of what product is 
being produced.

    Note: Under this scenario, it is possible that the group status, 
and therefore the requirement to achieve emission reductions, for an 
emission point may change depending on the product being 
manufactured.]

    (iii) Whenever a flexible operation unit manufactures a product 
that meets the criteria of paragraph (b) of this section (i.e., does 
not use or produce any organic HAP), all activities associated with the 
manufacture of the product, including the operation and monitoring of 
control or recovery devices, shall be exempt from the requirements of 
this rule.
    (6) The determination of the primary product for a process unit, to 
include the determination of applicability of this subpart to process 
units that are designed and operated as flexible operation units, shall 
be reported in the Notification of Compliance Status required by 
Sec. 63.506(e)(5) when the primary product is determined to be an 
elastomer product. The Notification of Compliance Status shall include 
the information specified in either paragraph (e)(6)(i) or (e)(6)(ii) 
of this section. If the primary product is determined to be something 
other than an elastomer product, the owner or operator shall retain 
information, data, and analysis used to document the basis for the 
determination that the primary product is not an elastomer product.
    (i) If the EPPU manufactures only one elastomer product, 
identification of that elastomer product.
    (ii) If the EPPU is designed and operated as a flexible operation 
unit, the information specified in paragraphs (f)(6)(ii)(A) through 
(f)(6)(ii)(C) of this section, as appropriate.
    (A) Identification of the primary product.
    (B) Information concerning operating time and/or production mass 
for each product that was used to make the determination of the primary 
product under paragraph (f)(2)(i) or (f)(2)(ii) of this section.
    (C) Identification of which compliance option, either paragraph 
(f)(5)(i) or (f)(5)(ii) of this section, has been selected by the owner 
or operator.
    (7) To demonstrate compliance with the rule during those periods 
when a flexible operation unit that is subject to this subpart is 
producing a product other than an elastomer product or is producing an 
elastomer product that is not the primary product, the owner or 
operator shall comply with either paragraphs (f)(7)(i) and (f)(7)(ii) 
or paragraph (f)(7)(iii) of this section.
    (i) Establish parameter monitoring levels as specified in 
Sec. 63.505, for those emission points designated as Group 1, as 
appropriate.
    (ii) Submit the parameter monitoring levels developed under 
paragraph (f)(7)(i) of this section and the basis for them in the 
Notification of Compliance Status report, as specified in 
Sec. 63.506(e)(5).
    (iii) Demonstrate that the parameter monitoring levels established 
for the primary product are also appropriate for those periods when 
products other than the primary product are being produced. Material 
demonstrating this finding shall be submitted in the Notification of 
Compliance Status report as specified in Sec. 63.506(e)(5).
    (g) Storage vessel ownership determination. The owner or operator 
shall follow the procedures specified in paragraphs (g)(1) through 
(g)(8) of this section to determine to which process unit a storage 
vessel shall belong.
    (1) If a storage vessel is already subject to another subpart of 40 
CFR part 63 on September 5, 1996, that storage vessel shall belong to 
the process unit subject to the other subpart.
    (2) If a storage vessel is dedicated to a single process unit, the 
storage vessel shall belong to that process unit.
    (3) If a storage vessel is shared among process units, then the 
storage vessel shall belong to that process unit located on the same 
plant site as the storage vessel that has the greatest input into or 
output from the storage vessel (i.e., the process unit has the 
predominant use of the storage vessel).
    (4) If predominant use cannot be determined for a storage vessel 
that is shared among process units and if only one of those process 
units is an EPPU subject to this subpart, the storage vessel shall 
belong to that EPPU.
    (5) If predominant use cannot be determined for a storage vessel 
that is shared among process units and if more than one of the process 
units are EPPUs that have different primary products and that are 
subject to this subpart, then the owner or operator shall assign the 
storage vessel to any one of the EPPUs sharing the storage vessel.
    (6) If the predominant use of a storage vessel varies from year to 
year, then predominant use shall be determined based on the utilization 
that occurred during the year preceding September 5, 1996 or based on 
the expected

[[Page 46927]]

utilization for the 5 years following September 5, 1996 for existing 
affected sources, whichever is more representative of the expected 
operations for that storage vessel, and based on the expected 
utilization for the 5 years after initial startup for new affected 
sources. The determination of predominant use shall be reported in the 
Notification of Compliance Status required by Sec. 63.506(e)(5)(vii). 
If the predominant use changes, the redetermination of predominant use 
shall be reported in the next Periodic Report.
    (7) If the storage vessel begins receiving material from (or 
sending material to) another process unit; ceases to receive material 
from (or send material to) a process unit; or if the applicability of 
this subpart to a storage vessel has been determined according to the 
provisions of paragraphs (g)(1) through (g)(6) of this section and 
there is a significant change in the use of the storage vessel that 
could reasonably change the predominant use, the owner or operator 
shall reevaluate the applicability of this subpart to the storage 
vessel.
    (8) Where a storage vessel is located at a major source that 
includes one or more process units which place material into, or 
receive materials from the storage vessel, but the storage vessel is 
located in a tank farm, the applicability of this subpart shall be 
determined according to the provisions in paragraphs (g)(8)(i) through 
(g)(8)(iv) of this section.
    (i) The storage vessel may only be assigned to a process unit that 
utilizes the storage vessel and does not have an intervening storage 
vessel for that product (or raw materials, as appropriate). With 
respect to any process unit, an intervening storage vessel means a 
storage vessel connected by hard-piping to the process unit and to the 
storage vessel in the tank farm so that product or raw material 
entering or leaving the process unit flows into (or from) the 
intervening storage vessel and does not flow directly into (or from) 
the storage vessel in the tank farm.
    (ii) If there is no process unit at the major source that meets the 
criteria of paragraph (g)(8)(i) of this section with respect to a 
storage vessel, this subpart does not apply to the storage vessel.
    (iii) If there is only one process unit at the major source that 
meets the criteria of paragraph (g)(8)(i) of this section with respect 
to a storage vessel, the storage vessel shall be assigned to that 
process unit. Applicability of this subpart to the storage vessel shall 
then be determined according to the provisions of paragraph (a) of this 
section.
    (iv) If there are two or more process units at the major source 
that meet the criteria of paragraph (g)(8)(i) of this section with 
respect to a storage vessel, the storage vessel shall be assigned to 
one of those process units according to the provisions of paragraph 
(g)(6) of this section. The predominant use shall be determined among 
only those process units that meet the criteria of paragraph (g)(8)(i) 
of this section.
    (h) Recovery operation equipment ownership determination. The owner 
or operator shall follow the procedures specified in paragraphs (h)(1) 
through (h)(7) of this section to determine to which process unit 
recovery operation equipment shall belong.
    (1) If recovery operation equipment is already subject to another 
subpart of 40 CFR part 63 on September 5, 1996, that recovery operation 
equipment shall belong to the process unit subject to the other 
subpart.
    (2) If recovery operation equipment is used exclusively by a single 
process unit, the recovery operation shall belong to that process unit.
    (3) If recovery operation equipment is shared among process units, 
then the recovery operation equipment shall belong to that process unit 
located on the same plant site as the recovery operation equipment that 
has the greatest input into or output from the recovery operation 
equipment (i.e., that process unit has the predominant use of the 
recovery operation equipment).
    (4) If predominant use cannot be determined for recovery operation 
equipment that is shared among process units and if one of those 
process units is an EPPU subject to this subpart, the recovery 
operation equipment shall belong to the EPPU subject to this subpart.
    (5) If predominant use cannot be determined for recovery operation 
equipment that is shared among process units and if more than one of 
the process units are EPPUs that have different primary products and 
that are subject to this subpart, then the owner or operator shall 
assign the recovery operation equipment to any one of those EPPUs.
    (6) If the predominant use of recovery operation equipment varies 
from year to year, then the predominant use shall be determined based 
on the utilization that occurred during the year preceding September 5, 
1996 or based on the expected utilization for the 5 years following 
September 5, 1996 for existing affected sources, whichever is the more 
representative of the expected operations for the recovery operations 
equipment, and based on the expected utilization for the first 5 years 
after initial startup for new affected sources. This determination 
shall be reported in the Notification of Compliance Status required by 
Sec. 63.506(e)(5)(viii). If the predominant use changes, the 
redetermination of predominant use shall be reported in the next 
Periodic Report.
    (7) If there is an unexpected change in the utilization of recovery 
operation equipment that could reasonably change the predominant use, 
the owner or operator shall redetermine to which process unit the 
recovery operation belongs by reperforming the procedures specified in 
paragraphs (h)(2) through (h)(6) of this section.
    (i) Changes or additions to plant sites. The provisions of 
paragraphs (i)(1) through (i)(4) of this section apply to owners or 
operators that change or add to their plant site or affected source. 
Paragraph (i)(5) provides examples of what are and are not considered 
process changes for purposes of paragraph (i) of this section.
    (1) Adding an EPPU to a plant site. The provisions of paragraphs 
(i)(1)(i) through (i)(1)(ii) of this section apply to owners or 
operators that add EPPUs to a plant site.
    (i) If an EPPU is added to a plant site, the addition shall be a 
new affected source and shall be subject to the requirements for a new 
affected source in this subpart upon initial startup or by September 5, 
1996, whichever is later, if the addition meets the criteria specified 
in paragraphs (i)(1)(i)(A) through (i)(1)(i)(B) and either (i)(1)(i)(C) 
or (i)(1)(i)(D) of this section:
    (A) It is an addition that meets the definition of construction in 
Sec. 63.2 of subpart A;
    (B) Such construction commenced after June 12, 1995; and
    (C) The addition has the potential to emit 10 tons per year or more 
of any HAP or 25 tons per year or more of any combination of HAP, and 
the primary product of the addition is currently produced at the plant 
site as the primary product of an affected source; or
    (D) The primary product of the addition is not currently produced 
at the plant site as the primary product of an affected source, and the 
plant site meets, or after the addition is constructed will meet, the 
definition of a major source in Sec. 63.2 of subpart A.
    (ii) If an EPPU is added to a plant site, the addition shall be 
subject to the requirements for an existing affected source in this 
subpart upon initial startup or by 3 years after September 5, 1996, 
whichever is later, if the addition does not meet the criteria 
specified in

[[Page 46928]]

paragraph (i)(1)(i) of this section and the plant site meets, or after 
the addition is completed will meet, the definition of major source.
    (2) Adding emission points or making process changes to existing 
affected sources. The provisions of paragraphs (i)(2)(i) through 
(i)(2)(ii) of this section apply to owners or operators that add 
emission points or make process changes to an existing affected source.
    (i) If any process change is made or emission point is added to an 
existing affected source, or if a process change creating one or more 
additional Group 1 emission point(s) is made to an existing affected 
source, the entire affected source shall be a new affected source and 
shall be subject to the requirements for a new affected source in this 
subpart upon initial startup or by September 5, 1996, whichever is 
later, if the process change or addition meets the criteria specified 
in paragraphs (i)(2)(i)(A) through (i)(2)(i)(B) of this section:
    (A) It is a process change or addition that meets the definition of 
reconstruction in Sec. 63.2 of subpart A; and
    (B) Such reconstruction commenced after June 12, 1995.
    (ii) If any process change is made or emission point is added to an 
existing affected source, or if a process change creating one or more 
additional Group 1 emission point(s) is made to an existing affected 
source and the process change or addition does not meet the criteria 
specified in paragraphs (i)(2)(i)(A) and (i)(2)(i)(B) of this section, 
the resulting emission point(s) shall be subject to the requirements 
for an existing affected source in this subpart. The resulting emission 
point(s) shall be in compliance upon initial startup or by 3 years 
after September 5, 1996, whichever is later, unless the owner or 
operator demonstrates to the Administrator that achieving compliance 
will take longer than making the process change or addition. If this 
demonstration is made to the Administrator's satisfaction, the owner or 
operator shall follow the procedures in paragraphs (i)(2)(iii)(A) 
through (i)(2)(iii)(C) of this section to establish a compliance date.
    (iii) To establish a compliance date for an emission point or 
points specified in paragraph (i)(2)(ii) of this section, the 
procedures specified in paragraphs (i)(2)(iii)(A) through 
(i)(2)(iii)(C) of this section shall be followed.
    (A) The owner or operator shall submit to the Administrator for 
approval a compliance schedule, along with a justification for the 
schedule.
    (B) The compliance schedule shall be submitted within 180 days 
after the process change or addition is made or the information 
regarding the change or addition is known to the owner or operator, 
unless the compliance schedule has been previously submitted to the 
permitting authority. The compliance schedule may be submitted in the 
next Periodic Report if the process change or addition is made after 
the date the Notification of Compliance Status report is due.
    (C) The Administrator shall approve the compliance schedule or 
request changes within 120 calendar days of receipt of the compliance 
schedule and justification.
    (3) Existing source requirements for Group 2 emission points that 
become Group 1 emission points. If a process change or addition that 
does not meet the criteria in paragraph (i)(1) or (i)(2) of this 
section is made to an existing plant site or existing affected source, 
and the change causes a Group 2 emission point to become a Group 1 
emission point, for that emission point the owner or operator shall 
comply with the requirements of this subpart for existing Group 1 
emission points. Compliance shall be achieved as expeditiously as 
practicable, but in no event later than 3 years after the emission 
point becomes a Group 1 emission point.
    (4) Existing source requirements for some emission points that 
become subject to subpart H requirements. If a surge control vessel or 
bottoms receiver becomes subject to Sec. 63.170 of subpart H, or if a 
compressor becomes subject to Sec. 63.164 of subpart H, the owner or 
operator shall be in compliance upon initial startup or by 3 years 
after September 5, 1996, whichever is later, unless the owner or 
operator demonstrates to the Administrator that achieving compliance 
will take longer than making the change. If this demonstration is made 
to the Administrator's satisfaction, the owner or operator shall follow 
the procedures in paragraphs (i)(2)(iii)(A) through (i)(2)(iii)(C) of 
this section to establish a compliance date.
    (5) Determining what are and are not process changes. For purposes 
of paragraph (i) of this section, examples of process changes include, 
but are not limited to, changes in production capacity, feedstock type, 
or catalyst type, or whenever there is a replacement, removal, or 
addition of recovery equipment. For purposes of paragraph (i) of this 
section, process changes do not include: Process upsets, unintentional 
temporary process changes, and changes that are within the equipment 
configuration and operating conditions documented in the Notification 
of Compliance Status report required by Sec. 63.506(e)(5).
    (j) Applicability of this subpart except during periods of startup, 
shutdown, and malfunction. Each provision set forth in this subpart or 
referred to in this subpart shall apply at all times except during 
periods of startup, shutdown, and malfunction if the startup, shutdown, 
or malfunction precludes the ability of a particular emission point at 
an affected source to comply with one or more specific provisions to 
which it is subject.


Sec. 63.481  Compliance schedule and relationship to existing 
applicable rules.

    (a) Affected sources are required to achieve compliance on or 
before the dates specified in paragraphs (b) through (d) of this 
section. Paragraph (e) of this section provides information on 
requesting compliance extensions. Paragraphs (f) through (i) of this 
section discuss the relationship of this subpart to subpart A and to 
other applicable rules. Where an override of another authority of the 
Act is indicated in this subpart, only compliance with the provisions 
of this subpart is required. Paragraph (j) of this section specifies 
the meaning of time periods.
    (b) New affected sources that commence construction or 
reconstruction after June 12, 1995 shall be in compliance with this 
subpart upon initial startup or September 5, 1996, whichever is later, 
as provided in Sec. 63.6(b) of subpart A.
    (c) Existing affected sources shall be in compliance with this 
subpart (except for Sec. 63.502 for which compliance is covered by 
paragraph (d) of this section) no later than 3 years after September 5, 
1996, as provided in Sec. 63.6(c) of subpart A, unless an extension has 
been granted as specified in paragraph (e) of this section.
    (d) Except as provided for in paragraphs (d)(1) through (d)(4) of 
this section, existing affected sources shall be in compliance with 
Sec. 63.502 no later than March 5, 1997 unless a request for a 
compliance extension is granted pursuant to section 112(i)(3)(B) of the 
Act, as discussed in Sec. 63.182(a)(6) of subpart H.
    (1) Compliance with the compressor provisions of Sec. 63.164 of 
subpart H shall occur no later than September 5, 1997 for any 
compressor meeting one or more of the criteria in paragraphs (d)(1)(i) 
through (d)(1)(iii) of this section, if the work can be accomplished 
without a process unit shutdown, as defined in Sec. 63.161 of subpart 
H.
    (i) The seal system will be replaced;

[[Page 46929]]

    (ii) A barrier fluid system will be installed; or
    (iii) A new barrier fluid will be utilized which requires changes 
to the existing barrier fluid system.
    (2) Compliance with the compressor provisions of Sec. 63.164 of 
subpart H shall occur no later than March 5, 1998, for any compressor 
meeting all the criteria in paragraphs (d)(2)(i) through (d)(2)(iv) of 
this section.
    (i) The compressor meets one or more of the criteria specified in 
paragraphs (d)(1)(i) through (d)(1)(iii) of this section;
    (ii) The work can be accomplished without a process unit shutdown 
as defined in Sec. 63.161 of subpart H;
    (iii) The additional time is actually necessary, due to the 
unavailability of parts beyond the control of the owner or operator; 
and
    (iv) The owner or operator submits the request for a compliance 
extension to the U.S. Environmental Protection Agency (EPA) Regional 
Office at the addresses listed in Sec. 63.13 of subpart A no later than 
45 days before March 5, 1997. The request for a compliance extension 
shall contain the information specified in Sec. 63.6(i)(6)(i)(A), (B), 
and (D) of subpart A. Unless the EPA Regional Office objects to the 
request for a compliance extension within 30 calendar days after 
receipt of the request, the request shall be deemed approved.
    (3) If compliance with the compressor provisions of Sec. 63.164 of 
subpart H cannot reasonably be achieved without a process unit 
shutdown, as defined in Sec. 63.161 of subpart H, the owner or operator 
shall achieve compliance no later than September 8, 1998. The owner or 
operator who elects to use this provision shall submit a request for an 
extension of compliance in accordance with the requirements of 
paragraph (d)(2)(iv) of this section.
    (4) Compliance with the compressor provisions of Sec. 63.164 of 
subpart H shall occur not later than September 6, 1999 for any 
compressor meeting one or more of the criteria in paragraphs (d)(4)(i) 
through (d)(4)(iii) of this section. The owner or operator who elects 
to use these provisions shall submit a request for an extension of 
compliance in accordance with the requirements of paragraph (d)(2)(iv) 
of this section.
    (i) Compliance cannot be achieved without replacing the compressor;
    (ii) Compliance cannot be achieved without recasting the distance 
piece; or
    (iii) Design modifications are required to connect to a closed-vent 
or recovery system.
    (5) Compliance with the surge control vessel and bottoms receiver 
provisions of Sec. 63.170 of subpart H shall occur no later than 
September 6, 1999.
    (e) Pursuant to section 112(i)(3)(B) of the Act, an owner or 
operator may request an extension allowing the existing source up to 1 
additional year to comply with section 112(d) standards. For purposes 
of this subpart, a request for an extension shall be submitted to the 
operating permit authority as part of the operating permit application 
or to the Administrator as a separate submittal or as part of the 
Precompliance Report. Requests for extensions shall be submitted no 
later than the date on which the Precompliance Report is required to be 
submitted in Sec. 63.506(e)(3)(i). The dates specified in Sec. 63.6(i) 
of subpart A for submittal of requests for extensions shall not apply 
to this subpart.
    (1) A request for an extension of compliance shall include the data 
described in Sec. 63.6(i)(6)(i) (A), (B), and (D) of subpart A.
    (2) The requirements in Sec. 63.6(i)(8) through Sec. 63.6(i)(14) of 
subpart A shall govern the review and approval of requests for 
extensions of compliance with this subpart.
    (f) Table 1 of this subpart specifies the provisions of subpart A 
that apply and those that do not apply to owners and operators of 
affected sources subject to this subpart. For the purposes of this 
subpart, Table 3 of subpart F is not applicable.
    (g) Table 2 of this subpart summarizes the provisions of subparts 
F, G, and H that apply and those that do not apply to owners and 
operators of affected sources subject to this subpart.
    (h)(1) After the compliance dates specified in this section, an 
affected source subject to this subpart that is also subject to the 
provisions of 40 CFR part 63, subpart I, is required to comply only 
with the provisions of this subpart.
    (2) Sources subject to 40 CFR part 63, subpart I that have elected 
to comply through a quality improvement program, as specified in 
Sec. 63.175 or Sec. 63.176 or both of subpart H, may elect to continue 
these programs without interruption as a means of complying with this 
subpart. In other words, becoming subject to this subpart does not 
restart or reset the ``compliance clock'' as it relates to reduced 
burden earned through a quality improvement program.
    (i) After the compliance dates specified in this section, a storage 
vessel that belongs to an affected source subject to this subpart that 
is also subject to the provisions of 40 CFR part 60, subpart Kb is 
required to comply only with the provisions of this subpart. After the 
compliance dates specified in paragraph (d) of this section, that 
storage vessel shall no longer be subject to 40 CFR part 60, subpart 
Kb.
    (j) All terms in this subpart that define a period of time for 
completion of required tasks (e.g., monthly, quarterly, annual), unless 
specified otherwise in the section or subsection that imposes the 
requirement, refer to the standard calendar periods.
    (1) Notwithstanding time periods specified in this subpart for 
completion of required tasks, such time periods may be changed by 
mutual agreement between the owner or operator and the Administrator, 
as specified in subpart A of this part (e.g., a period could begin on 
the compliance date or another date, rather than on the first day of 
the standard calendar period). For each time period that is changed by 
agreement, the revised period shall remain in effect until it is 
changed. A new request is not necessary for each recurring period.
    (2) Where the period specified for compliance is a standard 
calendar period, if the initial compliance date occurs after the 
beginning of the period, compliance shall be required according to the 
schedule specified in paragraphs (j)(2)(i) or (j)(2)(ii) of this 
section, as appropriate.
    (i) Compliance shall be required before the end of the standard 
calendar period within which the compliance deadline occurs, if there 
remain at least 2 weeks for tasks that must be performed monthly, at 
least 1 month for tasks that must be performed each quarter, or at 
least 3 months for tasks that must be performed annually; or
    (ii) In all other cases, compliance shall be required before the 
end of the first full standard calendar period after the period within 
which the initial compliance deadline occurs.
    (3) In all instances where a provision of this subpart requires 
completion of a task during each multiple successive period, an owner 
or operator may perform the required task at any time during the 
specified period, provided that the task is conducted at a reasonable 
interval after completion of the task during the previous period.


Sec. 63.482  Definitions.

    (a) The following terms used in this subpart shall have the meaning 
given them in subparts A (Sec. 63.2), F (Sec. 63.101), G (Sec. 63.111), 
and H (Sec. 63.161) as specified after each term:

Act (subpart A)
Administrator (subpart A)
Automated monitoring and recording system (subpart G)
Average concentration (subpart G)
Boiler (subpart G)
Bottoms receiver (subpart H)

[[Page 46930]]

By compound (subpart G)
By-product (subpart F)
Car-seal (subpart G)
Chemical manufacturing process unit (subpart F)
Closed-vent system (subpart G)
Co-product (subpart F)
Combustion device (subpart G)
Commenced (subpart A)
Compliance date (subpart A)
Compliance schedule (subpart A)
Connector (subpart H)
Construction (subpart A)
Continuous monitoring system (subpart A)
Continuous record (subpart G)
Continuous recorder (subpart G)
Cover (subpart G)
Distillation unit (subpart G)
Emission standard (subpart A)
Emissions averaging (subpart A)
EPA (subpart A)
Equipment (subpart H)
Equipment leak (subpart F)
Existing source (subpart A)
External floating roof (subpart G)
Fill (subpart G)
Fixed roof (subpart G)
Flame zone (subpart G)
Flexible operation unit (subpart F)
Floating roof (subpart G)
Flow indicator (subpart G)
Halogens and hydrogen halides (subpart G)
Hazardous air pollutant (subpart A)
Heat exchange system (subpart F)
Impurity (subpart F)
Incinerator (subpart G)
In organic hazardous air pollutant service (subpart H)
Instrumentation system (subpart H)
Internal floating roof (subpart G)
Lesser quantity (subpart A)
Maintenance wastewater (subpart F)
Major source (subpart A)
Malfunction (subpart A)
Mass flow rate (subpart G)
Maximum true vapor pressure (subpart G)
New source (subpart A)
Open-ended valve or line (subpart H)
Operating permit (subpart F)
Organic HAP service (subpart H)
Organic monitoring device (subpart G)
Owner or operator (subpart A)
Performance evaluation (subpart A)
Performance test (subpart A)
Permitting authority (subpart A)
Plant site (subpart F)
Point of generation (subpart G)
Potential to emit (subpart A)
Primary fuel (subpart G)
Process heater (subpart G)
Process unit shutdown (subpart H)
Process wastewater (subpart F)
Process wastewater stream (subpart G)
Product separator (subpart F)
Reactor (subpart G)
Reconstruction (subpart A)
Recovery device (subpart G)
Reference control technology for process vents (subpart G)
Reference control technology for storage vessels (subpart G)
Reference control technology for wastewater (subpart G)
Relief valve (subpart G)
Research and development facility (subpart F)
Residual (subpart G)
Run (subpart A)
Secondary fuel (subpart G)
Sensor (subpart H)
Shutdown (subpart A)
Specific gravity monitoring device (subpart G)
Startup (subpart A)
Startup, shutdown, and malfunction plan (subpart F)
State (subpart A)
Surge control vessel (subpart H)
Temperature monitoring device (subpart G)
Test method (subpart A)
Total resource effectiveness index value (subpart G)
Treatment process (subpart G)
Unit operation (subpart F)
Vent stream (subpart G)
Visible emission (subpart A)
Waste management unit (subpart G)
Wastewater (subpart F)
Wastewater stream (subpart G)
    (b) All other terms used in this subpart shall have the meaning 
given them in this section. If a term is defined in a subpart 
referenced above and in this section, it shall have the meaning given 
in this section for purposes of this subpart.
    Affected source is defined in Sec. 63.480(a).
    Aggregate batch vent stream means a gaseous emission stream 
containing only the exhausts from two or more batch front-end process 
vents that are ducted together before being routed to a control device 
that is in continuous operation.
    Average flow rate, as used in conjunction with wastewater 
provisions, is defined in and determined by the specifications in 
Sec. 63.144(c) of subpart G; or, as used in conjunction with the batch 
front-end process vent provisions, is defined in and determined by the 
specifications in Sec. 63.488(e).
    Back-end refers to the unit operations in an EPPU following the 
stripping operations. Back-end process operations include, but are not 
limited to, filtering, coagulation, blending, concentration, drying, 
separating, and other finishing operations, as well as latex and crumb 
storage.
    Batch cycle means the operational step or steps, from start to 
finish, that occur as part of a batch unit operation.
    Batch cycle limitation means an enforceable restriction on the 
number of batch cycles that can be performed in a year for an 
individual batch front-end process vent.
    Batch emission episode means a discrete emission venting episode 
associated with a single batch unit operation. Multiple batch emission 
episodes may occur from a single batch unit operation.
    Batch front-end process vent means a point of emission from a batch 
unit operation having a gaseous emission stream with annual organic HAP 
emissions greater than 225 kilograms per year and located in the front-
end of a process unit. Batch front-end process vents exclude relief 
valve discharges and leaks from equipment regulated under Sec. 63.502.
    Batch process means a discontinuous process involving the bulk 
movement of material through sequential manufacturing steps. Mass, 
temperature, concentration, and other properties of the process vary 
with time. Addition of raw material and withdrawal of product do not 
typically occur simultaneously in a batch process. For the purposes of 
this subpart, a process producing polymers is characterized as 
continuous or batch based on the operation of the polymerization 
reactors.
    Batch unit operation means a unit operation operated in a batch 
process mode.
    Butyl rubber means a copolymer of isobutylene and other monomers. 
Typical other monomers include isoprene and methylstyrenes. A typical 
composition of butyl rubber is approximately 85 to 99 percent 
isobutylene and one to fifteen percent other monomers. Most butyl 
rubber is produced by precipitation polymerization, although other 
methods may be used.
    Compounding unit means a unit of operation which blends, melts, and 
resolidifies solid polymers for the purpose of incorporating additives, 
colorants, or stabilizers into the final elastomer product. A unit 
operation whose primary purpose is to remove residual monomers from 
polymers is not a compounding unit.
    Continuous front-end process vent means a point of emission from a 
continuous process unit operation within an affected source having a 
gaseous emission stream with a flow rate greater than or equal to 0.005 
standard cubic meter per minute and with a total organic HAP 
concentration greater than or equal to 50 parts per million by volume. 
Continuous front-end process vents exclude relief valve

[[Page 46931]]

discharges and leaks from equipment regulated under Sec. 63.502.
    Continuous process means a process where the inputs and outputs 
flow continuously through sequential manufacturing steps throughout the 
duration of the process. Continuous processes typically approach 
steady-state conditions. Continuous processes typically involve the 
simultaneous addition of raw material and withdrawal of product. For 
the purposes of this subpart, a process producing polymers is 
characterized as continuous or batch based on the operation of the 
polymerization reactors.
    Continuous unit operation means a unit operation operated in a 
continuous process mode.
    Control device is defined in Sec. 63.111 of subpart G, except that 
the term ``process vent'' shall be replaced with the term ``continuous 
front-end process vent'' for the purpose of this subpart.
    Crumb rubber dry weight means the weight of the polymer, minus the 
weight of water and residual organics.
    Drawing unit means a unit operation which converts polymer into a 
different shape by melting or mixing the polymer and then pulling it 
through an orifice to create a continuously extruded product.
    Elastomer means any polymer having a glass transition temperature 
lower than -10 deg.C, or a glass transition temperature between 
-10 deg.C and 25 deg.C that is capable of undergoing deformation 
(stretching) of several hundred percent and recovering essentially when 
the stress is removed. For the purposes of this subpart, resins are not 
considered to be elastomers.
    Elastomer product means one of the following 12 types of products, 
as they are defined in this section:
    (1) Butyl Rubber,
    (2) Halobutyl Rubber,
    (3) Epichlorohydrin Elastomers,
    (4) Ethylene Propylene Rubber,
    (5) HypalonTM,
    (6) Neoprene,
    (7) Nitrile Butadiene Rubber,
    (8) Nitrile Butadiene Latex,
    (9) Polybutadiene Rubber/Styrene Butadiene Rubber by Solution,
    (10) Polysulfide Rubber,
    (11) Styrene Butadiene Rubber by Emulsion, and
    (12) Styrene Butadiene Latex.
    Elastomer product process unit (EPPU) means a collection of 
equipment assembled and connected by pipes or ducts used to process raw 
materials and to manufacture an elastomer product as its primary 
product. This collection of equipment includes process vents; storage 
vessels, as determined in Sec. 63.480(g); and the equipment (i.e., 
pumps, compressors, agitators, pressure relief devices, sampling 
connection systems, open-ended valves or lines, valves, connectors, 
instrumentation systems, surge control vessels, and bottoms receivers 
that are associated with the elastomer product process unit) that are 
subject to the equipment leak provisions as specified in Sec. 63.502. 
Compounding units, spinning units, drawing units, extruding units, and 
other finishing steps are not part of an EPPU. In addition, a solid 
state polymerization unit is not part of an EPPU.
    Elastomer type means one of the elastomers defined under 
``elastomer product'' in this section. Each elastomer identified in 
that definition represents a different elastomer type.
    Emission point means an individual continuous front-end process 
vent, batch front-end process vent, back-end process vent, storage 
vessel, wastewater stream, or equipment leak.
    Emulsion process means a process carried out with the reactants in 
an emulsified form (e.g., polymerization reaction).
    Epichlorohydrin elastomer means an elastomer formed from the 
polymerization or copolymerization of epichlorohydrin (EPI). The main 
epichlorohydrin elastomers are polyepichlorohydrin, epi-ethylene oxide 
(EO) copolymer, epi-allyl glycidyl ether (AGE) copolymer, and epi-EO-
AGE terpolymer. Epoxy resins produced by the copolymerization of EPI 
and bisphenol A are not epichlorohydrin elastomers.
    Ethylene-propylene rubber means an ethylene-propylene copolymer or 
an ethylene-propylene terpolymer. Ethylene-propylene copolymers (EPM) 
result from the polymerization of ethylene and propylene and contain a 
saturated chain of the polymethylene type. Ethylene-propylene 
terpolymers (EPDM) are produced in a similar manner as EPM, except that 
a moderate amount of the third monomer is added to the reaction 
sequence. Typical third monomers include ethylidene norbornene, 1,4-
hexadiene, or dicyclopentadiene. Ethylidene norbornene is the most 
commonly used. The production process includes, but is not limited to, 
polymerization, recycle, recovery, and packaging operations. The 
polymerization reaction may occur in either a solution process or a 
suspension process.
    Extruding unit means a unit operation which converts polymer into a 
different shape by melting or mixing the polymer and then forcing it 
through an orifice to create a continuously extruded product.
    Front-end refers to the unit operations in an EPPU prior to, and 
including, the stripping operations. The process front-end includes all 
activity from raw material storage through the stripping operation, 
including pre-polymerization blending, reactions, etc. For all gas-
phased reaction processes, all unit operations are considered to be 
front-end.
    Gas-phased reaction process means an elastomer production process 
where the reaction occurs in a gas phase, fluidized bed.
    Grade means the subdivision of an elastomer product type by 
different characteristics such as molecular weight, monomer 
composition, significant mooney values, and the presence or absence of 
extender oil and/or carbon black.
    Group 1 batch front-end process vent means a batch front-end 
process vent releasing annual organic HAP emissions greater than or 
equal to 11,800 kg/yr and with a cutoff flow rate, calculated in 
accordance with Sec. 63.488(f), greater than or equal to the annual 
average flow rate.
    Group 2 batch front-end process vent means a batch front-end 
process vent that does not fall within the definition of a Group 1 
batch front-end process vent.
    Group 1 continuous front-end process vent means a continuous front-
end process vent releasing a gaseous emission stream that has a total 
resource effectiveness index value, calculated according to Sec. 63.115 
of subpart G, less than or equal to 1.0.
    Group 2 continuous front-end process vent means a continuous front-
end process vent that does not fall within the definition of a Group 1 
continuous front-end process vent.
    Group 1 storage vessel means a storage vessel at an existing 
affected source that meets the applicability criteria specified in 
Table 3 of this subpart, or a storage vessel at a new affected source 
that meets the applicability criteria specified in Table 4 of this 
subpart.
    Group 2 storage vessel means a storage vessel that does not fall 
within the definition of a Group 1 storage vessel.
    Group 1 wastewater stream means a process wastewater stream from an 
elastomer product process unit at an existing or new source with a 
total volatile organic hazardous air pollutant average concentration 
greater than or equal to 10,000 parts per million by weight of 
compounds listed in table 9 of subpart G at any flowrate; or a process 
wastewater stream from a process unit at an existing or new source that 
has an average flow rate greater than or equal to 10 liters per minute 
and a total volatile organic hazardous air pollutant

[[Page 46932]]

concentration greater than 1,000 parts per million by weight of 
compounds listed in table 9 of subpart G.
    Group 2 wastewater stream means any process wastewater stream that 
does not meet the definition of a Group 1 wastewater stream.
    Halobutyl rubber means a butyl rubber elastomer produced using 
halogenated copolymers.
    Halogenated aggregate batch vent stream means an aggregate batch 
vent stream determined to have a total mass emission rate of halogen 
atoms contained in organic compounds of 3,750 kg/yr or greater 
determined by the Procedures presented in Sec. 63.488(h).
    Halogenated batch front-end process vent means a batch front-end 
process vent determined to have a mass emission rate of halogen atoms 
contained in organic compounds of 3,750 kg/yr or greater determined by 
the procedures presented in Sec. 63.488(h).
    Halogenated continuous front-end process vent means a continuous 
front-end process vent determined to have a mass emission rate of 
halogen atoms contained in organic compounds of 0.45 kg/hr or greater 
determined by the procedures presented in Sec. 63.115(d)(2)(v) of 
subpart G.
    High conversion latex means a latex where all monomers are reacted 
to at least 95 percent conversion.
    Hypalon TM means a chlorosulfonated polyethylene that is a 
synthetic rubber produced for uses such as wire and cable insulation, 
shoe soles and heels, automotive components, and building products.
    Latex means a colloidal aqueous emulsion of elastomer. A latex may 
be further processed into finished products by direct use as a coating 
or as a foam, or it may be precipitated to separate the rubber 
particles, which are then used in dry state to prepare finished 
products.
    Latex weight includes the weight of the polymer and the weight of 
the water solution.
    Mass process means a process carried out through the use of thermal 
energy (e.g., polymerization reaction). Mass processes do not utilize 
emulsifying or suspending agents, but can utilize catalysts or other 
additives.
    Material recovery section means the equipment that recovers 
unreacted or by-product materials from any process section for return 
to the EPPU, off-site purification or treatment, or sale. Equipment 
designed to separate unreacted or by-product material from the polymer 
product is to be included in this process section, provided that at the 
time of initial compliance some of the material is recovered for reuse 
in the process, off-site purification or treatment, or sale. Otherwise, 
such equipment is to be assigned to one of the other process sections, 
as appropriate. If equipment is used to recover unreacted or by-product 
material and return it directly to the same piece of process equipment 
from which it was emitted, then the recovery equipment is considered to 
be part of the process section that contains the process equipment. On 
the other hand, if equipment is used to recover unreacted or by-product 
material and return it to a different piece of process equipment in the 
same process section, the recovery equipment is considered to be part 
of a material recovery section. Equipment that treats recovered 
materials is to be included in this process section, but equipment that 
also treats raw materials is not to be included in this process 
section. The latter equipment is to be included in the raw materials 
preparation section.
    Month means either a calendar month or a repeating 30-day period. 
For the purposes of compliance with the back-end limitations in 
Sec. 63.506, a month can begin on any day of the month (i.e., starting 
on the 15th and ending on the 14th of the following month), 
as long as the month never contains more than 31 calendar days.
    Neoprene means a polymer of chloroprene (2-chloro-1,3-butadiene). 
The free radical emulsion process is generally used to produce 
neoprene, although other methods may be used.
    Nitrile butadiene latex means a polymer consisting primarily of 
unsaturated nitriles and dienes, usually acrylonitrile and 1,3-
butadiene, that is sold as a latex.
    Nitrile butadiene rubber means a polymer consisting primarily of 
unsaturated nitriles and dienes, usually acrylonitrile and 1,3-
butadiene, not including those facilities that produce nitrile 
butadiene latex.
    Organic hazardous air pollutant(s) (organic HAP) means one or more 
of the chemicals listed in Table 5 of this subpart or any other 
chemical which:
    (1) Is knowingly introduced into the manufacturing process other 
than as an impurity, or has been or will be reported under any Federal 
or State program, such as EPCRA section 311, 312, or 313 or Title V; 
and
    (2) Is listed in Table 2 of subpart F of this part.
    Polybutadiene rubber/styrene butadiene rubber by solution means a 
polymer of 1,3-butadiene produced using a solution process, and/or a 
polymer that consists primarily of styrene and butadiene monomer units 
and is produced using a solution process.
    Polymerization reaction section means the equipment designed to 
cause monomer(s) to react to form polymers, including equipment 
designed primarily to cause the formation of short polymer chains 
(e.g., oligomers or low polymers), but not including equipment designed 
to prepare raw materials for polymerization (e.g., esterification 
vessels). For the purposes of this subpart, the polymerization reaction 
section begins with the equipment used to transfer the materials from 
the raw materials preparation section and ends with the last vessel in 
which polymerization occurs.
    Polysulfide rubber means a polymer produced by reacting sodium 
polysulfide and chloroethyl formal. Polysulfide rubber may be produced 
as latexes or solid product.
    Primary product is defined in and determined by the procedures 
specified in Sec. 63.480(f).
    Process section means the equipment designed to accomplish a 
general but well-defined task in polymers production. Process sections 
include raw materials preparation, polymerization reaction, and 
material recovery. A process section may be dedicated to a single EPPU 
or may be common to more than one EPPU.
    Process unit means a collection of equipment assembled and 
connected by pipes or ducts to process raw materials and to manufacture 
a product.
    Process vent means a point of emission from a unit operation having 
a gaseous emission stream. Typical process vents include condenser 
vents, dryer vents, vacuum pumps, steam ejectors, and atmospheric vents 
from reactors and other process vessels, but do not include pressure 
relief valves.
    Product means a compound or material which is manufactured by a 
process unit. By-products, isolated intermediates, impurities, wastes, 
and trace contaminants are not considered products.
    Raw materials preparation section means the equipment at a polymer 
manufacturing plant designed to prepare raw materials, such as monomers 
and solvents, for polymerization. For the purposes of this standard, 
this process section begins with the equipment used to transfer raw 
materials from storage and/or the equipment used to transfer recovered 
material from the material recovery process sections, and ends with the 
last piece of equipment that prepares the material for polymerization. 
The raw materials preparation section may include equipment that is 
used to purify, dry, or otherwise treat raw materials or raw and 
recovered

[[Page 46933]]

materials together; to activate catalysts; and to promote 
esterification including the formation of some short polymer chains 
(oligomers). The raw materials preparation section does not include 
equipment that is designed primarily to accomplish the formation of 
oligomers, the treatment of recovered materials alone, or the storage 
of raw materials.
    Recovery operations equipment means the equipment used to separate 
the components of process streams. Recovery operations equipment 
includes distillation units, condensers, etc. Equipment used for 
wastewater treatment shall not be considered recovery operations 
equipment.
    Resin means a polymer that is not an elastomer. The following are 
characteristics of resins and the production of resins:
    (1) The polymer is a block polymer;
    (2) The manufactured polymer does not require vulcanization to make 
useful products;
    (3) The polymer production process is operated to achieve at least 
99 percent monomer conversion; and
    (4) The polymer process unit does not recycle unreacted monomer 
back to the process.
    Solid state polymerization unit means a unit operation which, 
through the application of heat, furthers the polymerization (i.e., 
increases the intrinsic viscosity) of polymer chips.
    Solution process means a process where both the monomers and the 
resulting polymers are dissolved in an organic solvent.
    Steady-state conditions means that all variables (temperatures, 
pressures, volumes, flow rates, etc.) in a process do not vary 
significantly with time; minor fluctuations about constant mean values 
can occur.
    Storage vessel means a tank or other vessel that is used to store 
liquids that contain one or more organic HAP and that has been 
assigned, according to the procedures in Sec. 63.480(g), to an EPPU 
that is subject to this subpart. Storage vessels do not include:
    (1) Vessels permanently attached to motor vehicles such as trucks, 
railcars, barges, or ships;
    (2) Pressure vessels designed to operate in excess of 204.9 
kilopascals and without emissions to the atmosphere;
    (3) Vessels with capacities smaller than 38 cubic meters;
    (4) Vessels and equipment storing and/or handling material that 
contains no organic HAP, or organic HAP as impurities only;
    (5) Surge control vessels and bottoms receiver tanks; and
    (6) Wastewater storage tanks.
    Stripping technology means the removal of organic compounds from a 
raw elastomer product by the use of heat and/or vacuum. Stripping 
technology includes steam stripping, direct volatilization, chemical 
stripping, and other methods of devolatilization.
    Styrene butadiene latex means a polymer consisting primarily of 
styrene and butadiene monomer units produced using an emulsion process 
and sold as a latex.
    Styrene butadiene rubber by emulsion means a polymer consisting 
primarily of styrene and butadiene monomer units produced using an 
emulsion process. Styrene butadiene rubber by emulsion does not include 
styrene butadiene latex.
    Suspension process means a process carried out with the reactants 
in a state of suspension, typically achieved through the use of water 
and/or suspending agents (e.g., polymerization reaction).
    Total organic compounds (TOC) means those compounds, excluding 
methane and ethane, measured according to the procedures of Method 18 
or Method 25A of 40 CFR part 60, appendix A.
    Year means any consecutive 12-month period or 365 rolling days. For 
the purposes of emissions averaging, the term year applies to any 12-
month period selected by the facility and defined in its Emissions 
Averaging Plan. For the purposes of batch cycle limitations, the term 
year applies to the 12-month period defined by the facility in its 
Notification of Compliance Status.


Sec. 63.483  Emission standards.

    (a) Except as allowed under paragraphs (b) and (c) of this section, 
the owner or operator of an existing or new affected source shall 
comply with the provisions in:
    (1) Section 63.484 for storage vessels;
    (2) Section 63.485 for continuous front-end process vents;
    (3) Sections 63.486 through 63.492 for batch front-end process 
vents;
    (4) Sections 63.493 through 63.500 for back-end process operations;
    (5) Section 63.501 for wastewater;
    (6) Section 63.502 for equipment leaks;
    (7) Section 63.504 for additional test methods and procedures;
    (8) Section 63.505 for monitoring levels and excursions; and
    (9) Section 63.506 for general reporting and recordkeeping 
requirements.
    (b) Instead of complying with Secs. 63.484, 63.485, 63.493, and 
63.501, the owner or operator of an existing affected source may elect 
to control any or all of the storage vessels, continuous front-end 
process vents, batch front-end process vents, aggregate batch vent 
streams, and back-end process emissions within the affected source, 
plus any or all process wastewater streams associated with the affected 
source, to different levels using an emissions averaging compliance 
approach that uses the procedures specified in Sec. 63.503. An owner or 
operator electing to use emissions averaging must still comply with the 
provisions of Secs. 63.484, 63.485, 63.486, 63.493, and 63.501 for 
affected source emission points not included in the emissions average.
    (c) A State may decide not to allow the use of the emissions 
averaging compliance approach specified in paragraph (b) of this 
section as a compliance option for an existing affected source.


Sec. 63.484  Storage vessel provisions.

    (a) For each storage vessel located at an affected source, except 
for those storage vessels exempted by paragraph (b) of this section, 
the owner or operator shall comply with the requirements of 
Secs. 63.119 through 63.123 and Sec. 63.148 of subpart G, with the 
differences noted in paragraphs (c) through (q) of this section.
    (b) Storage vessels described in paragraphs (b)(1) through (b)(7) 
of this section are exempt from the storage vessel requirements of this 
section.
    (1) Storage vessels containing styrene-butadiene latex;
    (2) Storage vessels containing other latex products and located 
downstream of the stripping operations;
    (3) Storage vessels containing high conversion latex products;
    (4) Storage vessels located downstream of the stripping operations 
at affected sources subject to the back-end residual organic HAP 
limitation located in Sec. 63.494, that are complying through the use 
of stripping technology, as specified in Sec. 63.495;
    (5) Storage vessels containing styrene;
    (6) Storage vessels containing acrylamide; and
    (7) Storage vessels containing epichlorohydrin.
    (c) When the term ``storage vessel'' is used in Secs. 63.119 
through 63.123 and 63.148 of subpart G, the definition of this term in 
Sec. 63.482 shall apply for the purposes of this subpart.
    (d) When the term ``Group 1 storage vessel'' is used in 
Secs. 63.119 through 63.123 and Sec. 63.148 of subpart G, the 
definition of this term in Sec. 63.482 shall apply for the purposes of 
this subpart.
    (e) When the term ``Group 2 storage vessel'' is used in 
Secs. 63.119 through

[[Page 46934]]

63.123 and Sec. 63.148 of subpart G, the definition of this term in 
Sec. 63.482 shall apply for the purposes of this subpart.
    (f) When the emissions averaging provisions of Sec. 63.150 of 
subpart G are referred to in Sec. 63.119 and Sec. 63.123 of subpart G, 
the emissions averaging provisions contained in Sec. 63.503 shall apply 
for the purposes of this subpart.
    (g) When December 31, 1992 is referred to in Sec. 63.119 of subpart 
G, it shall be replaced with June 12, 1995 for the purposes of this 
subpart.
    (h) When April 22, 1994 is referred to in Sec. 63.119 of subpart G, 
it shall be replaced with September 5, 1996 for the purposes of this 
subpart.
    (i) Each owner or operator shall comply with this paragraph instead 
of Sec. 63.120(d)(1)(ii) of subpart G for the purposes of this subpart. 
If the control device used to comply with this section is also used to 
comply with Secs. 63.485 through Sec. 63.501, the performance test 
required for these sections is acceptable for demonstrating compliance 
with Sec. 63.119(e) of subpart G for the purposes of this subpart. The 
owner or operator will not be required to prepare a design evaluation 
for the control device as described in Sec. 63.120(d)(1)(i) of subpart 
G, if the performance test meets the criteria specified in paragraphs 
(i)(1) and (i)(2) of this section.
    (1) The performance test demonstrates that the control device 
achieves greater than or equal to the required control efficiency 
specified in Sec. 63.119(e)(1) or Sec. 63.119(e)(2) of subpart G, as 
applicable; and
    (2) The performance test is submitted as part of the Notification 
of Compliance Status required by Sec. 63.506(e)(5).
    (j) When the term ``operating range'' is used in 
Sec. 63.120(d)(3)(i) of subpart G, it shall be replaced with the term 
``level,'' for the purposes of this subpart. This level shall be 
established using the procedures specified in Sec. 63.505.
    (k) When the Notification of Compliance Status requirements 
contained in Sec. 63.152(b) of subpart G are referred to in 
Secs. 63.120, 63.122, and 63.123 of subpart G, the Notification of 
Compliance Status requirements contained in Sec. 63.506(e)(5) shall 
apply for the purposes of this subpart.
    (l) When the Periodic Report requirements contained in 
Sec. 63.152(c) of subpart G are referred to in Secs. 63.120, 63.122, 
and 63.123 of subpart G, the Periodic Report requirements contained in 
Sec. 63.506(e)(6) shall apply for the purposes of this subpart.
    (m) When other reports as required in Sec. 63.152(d) of subpart G 
are referred to in Sec. 63.122 of subpart G, the reporting requirements 
contained in Sec. 63.506(e)(7) shall apply for the purposes of this 
subpart.
    (n) When the Implementation Plan requirements contained in 
Sec. 63.151(c) of subpart G are referred to in Sec. 63.119 through 
Sec. 63.123 of subpart G, for the purposes of this subpart the owner or 
operator of an affected source need not comply.
    (o) When the Initial Notification Plan requirements contained in 
Sec. 63.151(b) of subpart G are referred to in Sec. 63.119 through 
Sec. 63.123 of subpart G, for the purposes of this subpart the owner or 
operator of an affected source need not comply.
    (p) When the determination of equivalence criteria in 
Sec. 63.102(b) of subpart F are referred to in Sec. 63.121(a) of 
subpart G, the provisions in Sec. 63.6(g) of subpart A shall apply for 
the purposes of this subpart.
    (q) The compliance date for storage vessels at affected sources 
subject to the provisions of this section is specified in Sec. 63.481.


Sec. 63.485  Continuous front-end process vent provisions.

    (a) For each continuous front-end process vent located at an 
affected source, the owner or operator shall comply with the 
requirements of Secs. 63.113 through 63.118 of subpart G, except as 
provided for in paragraphs (b) through (s) of this section. Continuous 
front-end process vents that are combined with one or more batch front-
end process vents shall comply with paragraph (m) or (n) of this 
section.
    (b) When the term ``process vent'' is used in Secs. 63.113 through 
63.118 of subpart G, it shall be replaced with the term ``continuous 
front-end process vent,'' and the definition of this term in 
Sec. 63.482 shall apply for the purposes of this subpart.
    (c) When the term ``halogenated process vent'' is used in 
Secs. 63.113 through 63.118 of subpart G, it shall be replaced with the 
term ``halogenated continuous front-end process vent,'' and the 
definition of this term in Sec. 63.482 shall apply for the purposes of 
this subpart.
    (d) When the term ``Group 1 process vent'' is used in Secs. 63.113 
through 63.118 of subpart G, it shall be replaced with the term ``Group 
1 continuous front-end process vent,'' and the definition of this term 
in Sec. 63.482 shall apply for the purposes of this subpart.
    (e) When the term ``Group 2 process vent'' is used in Secs. 63.113 
through 63.118 of subpart G, it shall be replaced with the term ``Group 
2 continuous front-end process vent,'' and the definition of this term 
in Sec. 63.482 shall apply for the purposes of this subpart.
    (f) When December 31, 1992 is referred to in Sec. 63.113 of subpart 
G, it shall be replaced with June 12, 1995 for the purposes of this 
subpart.
    (g) When Secs. 63.151(f), alternative monitoring parameters, and 
63.152(e), submission of an operating permit, of subpart G are referred 
to in Secs. 63.114(c) and 63.117(e) of subpart G, Sec. 63.506(f), 
alternative monitoring parameters, and Sec. 63.506(e)(8), submission of 
an operating permit, respectively, shall apply for the purposes of this 
subpart.
    (h) When the Notification of Compliance Status requirements 
contained in Sec. 63.152(b) of subpart G are referred to in 
Secs. 63.114, 63.117, and 63.118 of subpart G, the Notification of 
Compliance Status requirements contained in Sec. 63.506(e)(5) shall 
apply for the purposes of this subpart.
    (i) When the Periodic Report requirements contained in 
Sec. 63.152(c) of subpart G are referred to in Secs. 63.117 and 63.118 
of subpart G, the Periodic Report requirements contained in 
Sec. 63.506(e)(6) shall apply for the purposes of this subpart.
    (j) When the definition of excursion in Sec. 63.152(c)(2)(ii)(A) of 
subpart G is referred to in Sec. 63.118(f)(2) of subpart G, the 
definition of excursion in Sec. 63.505(g) and (h) shall apply for the 
purposes of this subpart.
    (k) For the purposes of this subpart, owners and operators shall 
comply with Sec. 63.505, parameter monitoring levels and excursions, 
instead of Sec. 63.114(e) of subpart G. When the term ``range'' is used 
in Sec. 63.117(f), Sec. 63.118(a)(2)(iv), (b)(2)(iv), (f)(1), and 
(f)(6) of subpart G, it shall be replaced with the term ``level.'' This 
level is determined in accordance with Sec. 63.505.
    (l) When reports of process changes are required under Sec. 63.118 
(g), (h), (i), and (j) of subpart G, paragraphs (l)(1) through (l)(4) 
of this section shall apply for the purposes of this subpart.
    (1) Whenever a process change, as defined in Sec. 63.115(e) of 
subpart G, is made that causes a Group 2 continuous front-end process 
vent to become a Group 1 continuous front-end process vent, the owner 
or operator shall submit the following information in the first 
periodic report following the process change, as specified in 
Sec. 63.506(e)(6)(iii)(D)(2):
    (i) A description of the process change; and
    (ii) A schedule for compliance with Sec. 63.113(a) of subpart G, as 
required under Sec. 63.506(e)(6)(iii)(D)(2).
    (2) Whenever a process change, as defined in Sec. 63.115(e) of 
subpart G, is made that causes a Group 2 continuous front-end process 
vent with a TRE greater than 4.0 to become a Group 2

[[Page 46935]]

continuous front-end process vent with a TRE less than 4.0, the owner 
or operator shall submit the following information in the first 
periodic report following the process change, as specified in 
Sec. 63.506(e)(6)(iii)(D)(2):
    (i) A description of the process change; and
    (ii) A schedule for compliance with the provisions of 
Sec. 63.113(d) of subpart G, as required under 
Sec. 63.506(e)(6)(iii)(D)(2).
    (3) Whenever a process change, as defined in Sec. 63.115(e) of 
subpart G, is made that causes a Group 2 continuous front-end process 
vent with a flow rate less than 0.005 standard cubic meter per minute 
(scmm) to become a Group 2 continuous front-end process vent with a 
flow rate of 0.005 scmm or greater and a TRE index value less than or 
equal to 4.0, the owner or operator shall submit the following 
information in the first periodic report following the process change, 
as specified in Sec. 63.506(e)(6)(iii)(D)(2):
    (i) A description of the process change; and
    (ii) A schedule for compliance with two provisions of 
Sec. 63.113(d) of subpart G, as required under 
Sec. 63.506(e)(6)(iii)(D)(2).
    (4) Whenever a process change, as defined in Sec. 63.115(e) of 
subpart G, is made that causes a Group 2 continuous front-end process 
vent with an organic HAP concentration less than 50 parts per million 
by volume (ppmv) to become a Group 2 continuous front-end process vent 
with an organic HAP concentration of 50 ppmv or greater and a TRE index 
value less than or equal to 4.0, the owner or operator shall submit the 
following information in the first periodic report following the 
process change, as specified in Sec. 63.506(e)(6)(iii)(D)(2):
    (i) A description of the process change; and
    (ii) A schedule for compliance with the provisions of 
Sec. 63.113(d) of subpart G, as required under 
Sec. 63.506(e)(6)(iii)(D)(2).
    (m) If a batch front-end process vent is combined with a continuous 
front-end process vent prior to being routed to a control device, the 
combined vent stream shall comply with either paragraph (m)(1) or 
(m)(2) of this section, as appropriate.
    (1) If the continuous front-end process vent is a Group 1 
continuous front-end process vent, the combined vent stream shall 
comply with all requirements for a Group 1 continuous process vent 
stream in Secs. 63.113 through 63.118 of subpart G, with the 
differences noted in paragraphs (b) through (l) of this section.
    (2) If the continuous front-end process vent is a Group 2 
continuous front-end process vent, the TRE index value shall be 
calculated during maximum representative operating conditions. For 
combined streams containing continuous front-end and batch front-end 
process vents, the maximum representative operating conditions shall be 
during periods when batch emission episodes are venting to the control 
device resulting in the highest concentration of organic HAP in the 
combined vent stream.
    (n) If a batch front-end process vent is combined with a continuous 
front-end process vent prior to being routed to a recovery device, the 
TRE index value shall be calculated at the exit of the recovery device 
at maximum representative operating conditions. For combined vent 
streams containing continuous front-end and batch front-end process 
vents, the maximum representative operating conditions shall be during 
periods when batch emission episodes are venting to the recovery device 
resulting in the highest concentration of organic HAP in the combined 
vent stream.
    (o) Group 1 halogenated continuous front-end process vents at 
affected existing sources producing butyl rubber, halobutyl rubber, or 
ethylene propylene rubber are exempt from the requirements to control 
hydrogen halides and halogens from the outlet of combustion devices 
contained in Sec. 63.113(c) of subpart G, if the conditions in 
paragraphs (o)(1) and (o)(2) of this section are met. Affected new 
sources are not exempt from these provisions.
    (1)(i) For affected sources producing butyl rubber, halobutyl 
rubber, or ethylene propylene rubber using a solution process, if the 
halogenated continuous front-end process vent stream was controlled by 
a combustion device prior to June 12, 1995, or
    (ii) For affected sources producing ethylene propylene rubber using 
a gas-phased reaction process, if the halogenated continuous front-end 
process vent stream was controlled by a combustion device since 
startup.
    (2) The combustion device meets the requirements of 
Sec. 63.113(a)(1)(i), Sec. 63.113(a)(2), Sec. 63.113(a)(3), or 
Sec. 63.113(b) of subpart G.
    (p) The compliance date for continuous front-end process vents 
subject to the provisions of this section is specified in Sec. 63.481. 
This replaces the reference to Sec. 63.100 of subpart F in 
Sec. 63.115(e)(2) of subpart G.
    (q) Internal combustion engines. In addition to the three options 
for the control of a Group 1 continuous front-end process vent listed 
in Sec. 63.113(a) (1)-(3) of subpart G, an owner or operator can route 
emissions of organic HAP to an internal combustion engine, provided the 
conditions listed in paragraphs (q)(1) through (q)(3) of this section 
are met.
    (1) The vent stream routed to the internal combustion engine shall 
not be a halogenated continuous front-end process vent stream.
    (2) The organic HAP is introduced with the primary fuel.
    (3) The owner or operator continuously monitors the on/off status 
of the internal combustion engine.
    (4) If an internal combustion engine meeting the requirements of 
paragraphs (q) (1) through (3) of this section is used to comply with 
the provisions of Sec. 63.113(a) of subpart G, the internal combustion 
engine is exempt from the source testing requirements of Sec. 63.116 of 
subpart G.
    (r) When the provisions of Sec. 63.116 (c)(3) and (c)(4) of subpart 
G specify that Method 18 shall be used, Method 18 or Method 25A may be 
used for the purposes of this subpart. The use of Method 25A shall 
comply with paragraphs (r)(1) and (r)(2) of this section.
    (1) The organic HAP used as the calibration gas for Method 25A 
shall be the single organic HAP representing the largest percent by 
volume of the emissions.
    (2) The use of Method 25A is acceptable if the response from the 
high-level calibration gas is at least 20 times the standard deviation 
of the response from the zero calibration gas when the instrument is 
zeroed on the most sensitive scale.
    (s) When the provisions of Sec. 63.116(b) identify conditions under 
which a performance test is not required, for purposes of this subpart, 
the exemption in paragraph (s)(1) of this section shall also apply. 
Further, if a performance test meeting the conditions specified in 
paragraph (s)(2) of this section has been conducted by the owner or 
operator, the results of that performance test shall suffice, for the 
purposes of this section.
    (1) An incinerator burning hazardous waste for which the owner or 
operator complies with the requirements of 40 CFR part 264, subpart O.
    (2) Performance tests done for other subparts in part 60 or part 63 
where total organic HAP or TOC was measured, provided that the owner or 
operator can demonstrate that operating conditions for the process and 
control or recovery device during the performance test are 
representative of current operating conditions.

[[Page 46936]]

Sec. 63.486   Batch front-end process vent provisions.

    (a) Batch front-end process vents. Except as specified in paragraph 
(b) of this section, owners and operators of new and existing affected 
sources with batch front-end process vents shall comply with the 
requirements in Secs. 63.487 through 63.492. The batch front-end 
process vent group status shall be determined in accordance with 
Sec. 63.488. Batch front-end process vents classified as Group 1 shall 
comply with the reference control technology requirements for Group 1 
batch front-end process vents in Sec. 63.487, the monitoring 
requirements in Sec. 63.489, the performance test methods and 
procedures to determine compliance requirements in Sec. 63.490, the 
recordkeeping requirements in Sec. 63.491, and the reporting 
requirements in Sec. 63.492. All Group 2 batch front-end process vents 
shall comply with the applicable reference control technology 
requirements in Sec. 63.487, the recordkeeping requirements in 
Sec. 63.491, and the reporting requirements in Sec. 63.492.
    (b) Aggregate batch vent streams. Aggregate batch vent streams, as 
defined in Sec. 63.482, are subject to the control requirements for 
individual batch front-end process vents, as specified in 
Sec. 63.487(b), as well as the monitoring, testing, recordkeeping, and 
reporting requirements specified in Sec. 63.489 through Sec. 63.492.


Sec. 63.487   Batch front-end process vents--reference control 
technology.

    (a) Batch front-end process vents. The owner or operator of a Group 
1 batch front-end process vent, as determined using the procedures in 
Sec. 63.488, shall comply with the requirements of either paragraph 
(a)(1) or (a)(2) of this section. Compliance can be based on either 
organic HAP or TOC.
    (1) For each batch front-end process vent, reduce organic HAP 
emissions using a flare.
    (i) The flare shall comply with the requirements of Sec. 63.11(b) 
of subpart A.
    (ii) Halogenated batch front-end process vents, as defined in 
Sec. 63.482, shall not be vented to a flare.
    (2) For each batch front-end process vent, reduce organic HAP 
emissions for the batch cycle by 90 weight percent using a control 
device. Owners or operators may achieve compliance with this paragraph 
through the control of selected batch emission episodes or the control 
of portions of selected batch emission episodes. Documentation 
demonstrating how the 90 weight percent emission reduction is achieved 
is required by Sec. 63.490(c)(2).
    (b) Aggregate batch vent streams. The owner or operator of an 
aggregate batch vent stream that contains one or more Group 1 batch 
front-end process vents shall comply with the requirements of either 
paragraph (b)(1) or (b)(2) of this section. Compliance can be based on 
either organic HAP or TOC.
    (1) For each aggregate batch vent stream, reduce organic HAP 
emissions using a flare.
    (i) The flare shall comply with the requirements of Sec. 63.11(b) 
of subpart A.
    (ii) Halogenated aggregate batch vent streams, as defined in 
Sec. 63.482, shall not be vented to a flare.
    (2) For each aggregate batch vent stream, reduce organic HAP 
emissions by 90 weight percent on a continuous basis using a control 
device.
    (c) Halogenated emissions. Halogenated Group 1 batch front-end 
process vents, halogenated aggregate batch vent streams, and 
halogenated continuous front-end process vents that are combusted as 
part of complying with paragraph (a)(2) or (b)(2) of this section, 
shall be controlled according to either paragraph (c)(1) or (c)(2) of 
this section.
    (1) If a combustion device is used to comply with paragraph (a)(2) 
or (b)(2) of this section for a halogenated batch front-end process 
vent or halogenated aggregate batch vent stream, the emissions shall be 
ducted from the combustion device to an additional control device that 
reduces overall emissions of hydrogen halides and halogens by 99 
percent before those emissions are discharged to the atmosphere.
    (2) A control device may be used to reduce the halogen atom mass 
emission rate to less than 3,750 kg/yr for batch front-end process 
vents or aggregate batch vent streams and thus make the batch front-end 
process vent or aggregate batch vent stream nonhalogenated. The 
nonhalogenated batch front-end process vent or aggregate batch vent 
stream must then comply with the requirements of either paragraph (a) 
or (b) of this section, as appropriate.
    (d) If a boiler or process heater is used to comply with the 
percent reduction requirement specified in paragraph (a)(2) or (b)(2) 
of this section, the batch front-end process vent or aggregate batch 
vent stream shall be introduced into the flame zone of such a device.
    (e) Combination of batch front-end process vents or aggregate batch 
vent streams with continuous front-end process vents. A batch front-end 
process vent or aggregate batch vent stream combined with a continuous 
front-end process vent stream is not subject to the provisions of 
Secs. 63.488 through 63.492, providing the requirements of paragraphs 
(e)(1), (e)(2), and either (e)(3) or (e)(4) of this section are met.
    (1) The batch front-end process vent is combined with a continuous 
front-end process vent prior to routing the continuous front-end 
process vent to a control or recovery device. In this paragraph, the 
definitions of control device and recovery device as they relate to 
continuous front-end process vents shall be used.
    (2) The only emissions to the atmosphere from the batch front-end 
process vent or aggregate batch vent stream prior to being combined 
with the continuous front-end process vent are from equipment subject 
to and in compliance with Sec. 63.502.
    (3) If the batch front-end vent stream or aggregate batch vent 
stream is combined with a continuous front-end process vent stream 
prior to being routed to a control device, the combined vent stream 
shall comply with the requirements in Sec. 63.485(m). In this 
paragraph, the definition of control device as it relates to continuous 
front-end process vents shall be used.
    (4) If the batch front-end process vent or aggregate batch vent 
stream is combined with a continuous front-end process vent stream 
prior to being routed to a recovery device, the combined vent stream 
shall comply with the requirements in Sec. 63.485(n). In this 
paragraph, the definition of recovery device as it relates to 
continuous front-end process vents shall be used.
    (f) Group 2 batch front-end process vents with annual emissions 
greater than or equal to the level specified in Sec. 63.488(d). The 
owner or operator of a Group 2 batch front-end process vent with annual 
emissions greater than or equal to the level specified in 
Sec. 63.488(d) shall comply with the provisions of paragraphs (f)(1) 
and (f)(2) of this section.
    (1) Establish a batch cycle limitation that ensures that the Group 
2 batch front-end process vent does not become a Group 1 batch front-
end process vent, and
    (2) Comply with the recordkeeping requirements in 
Sec. 63.491(d)(2), and the reporting requirements in Sec. 63.492(a)(3) 
and (b).
    (g) Group 2 batch front-end process vents with annual emissions 
less than the level specified in Sec. 63.488(d). The owner or operator 
of a Group 2 batch front-end process vent with annual organic HAP 
emissions less than the level specified in Sec. 63.488(d), shall comply 
with either paragraphs (g)(1) and (g)(2) of this section or with

[[Page 46937]]

paragraphs (f)(1) and (f)(2) of this section.
    (1) Establish a batch cycle limitation that ensures emissions do 
not exceed the appropriate level specified in Sec. 63.488(d), and
    (2) Comply with the recordkeeping requirements in 
Sec. 63.491(d)(1), and the reporting requirements in Sec. 63.492(a)(2), 
(b), and (c).


Sec. 63.488   Methods and procedures for batch front-end process vent 
group determination.

    (a) General requirements. Except as provided in paragraph (a)(3) of 
this section, the owner or operator of batch front-end process vents at 
affected sources shall determine the group status of each batch front-
end process vent in accordance with the provisions of this section. 
This determination may be based on either organic HAP or TOC emissions.
    (1) The procedures specified in paragraphs (b) through (i) shall be 
followed for the expected mix of products for a given batch front-end 
process vent, as specified in paragraph (a)(1)(i) of this section, or 
for the worst-case HAP emitting batch unit operation, as specified in 
paragraphs (a)(1)(ii) through (a)(1)(iv) of this section. ``Worst-case 
HAP emitting product'' is defined in paragraph (a)(1)(iii) of this 
section.
    (i) If an owner or operator chooses to follow the procedures 
specified in paragraphs (b) through (i) of this section for the 
expected mix of products, an identification of the different products 
and the number of batch cycles accomplished for each is required as 
part of the group determination documentation.
    (ii) If an owner or operator chooses to follow the procedures 
specified in paragraphs (b) through (i) of this section for the worst-
case HAP emitting product, documentation identifying the worst-case HAP 
emitting product is required as part of the group determination 
documentation.
    (iii) Except as specified in paragraph (a)(1)(iii)(B) of this 
section, the worst-case HAP emitting product is as defined in paragraph 
(a)(1)(iii)(A) of this section.
    (A) The worst-case HAP emitting product is the one with the highest 
mass emission rate (kg organic HAP per hour) averaged over the entire 
time period of the batch cycle.
    (B) Alternatively, when one product is produced more than 75 
percent of the time, accounts for more than 75 percent of the annual 
mass of product, and the owner or operator can show that the mass 
emission rate (kg organic HAP per hour) averaged over the entire time 
period of the batch cycle can reasonably be expected to be similar to 
the mass emission rate for other products having emissions from the 
same batch front-end process vent, that product may be considered the 
worst-case HAP emitting product.
    (C) An owner or operator shall determine the worst-case HAP 
emitting product for a batch front-end process vent as specified in 
paragraphs (a)(1)(iii)(C)(1) through (a)(1)(iii)(C)(3) of this section.
    (1) The emissions per batch emission episode shall be determined 
using any of the procedures specified in paragraph (b) of this section. 
The mass emission rate (kg organic HAP per hour) averaged over the 
entire time period of the batch cycle shall be determined by summing 
the emissions for each batch emission episode making up a complete 
batch cycle and dividing by the total duration in hours of the batch 
cycle.
    (2) To determine the worst-case HAP emitting product as specified 
under paragraph (a)(1)(iii)(A) of this section, the mass emission rate 
for each product shall be determined and compared.
    (3) To determine the worst-case HAP emitting product as specified 
under paragraph (a)(1)(iii)(B) of this section, the mass emission rate 
for the product meeting the time and mass criteria of paragraph 
(a)(1)(iii)(B) of this section shall be determined, and the owner or 
operator shall provide adequate information to demonstrate that the 
mass emission rate for said product is similar to the mass emission 
rates for the other products having emissions from the same batch 
process vent. In addition, the owner or operator shall provide 
information demonstrating that the selected product meets the time and 
mass criteria of paragraph (a)(1)(iii)(B) of this section.
    (iv) The annual production of the worst-case HAP emitting product 
shall be determined by ratioing the production time of the worst-case 
product up to a 12 month period of actual production. It is not 
necessary to ratio up to a maximum production rate (i.e., 8,760 hours 
per year at maximum design production).
    (2) The annual uncontrolled organic HAP or TOC emissions and 
average flow rate shall be determined at the exit from the batch unit 
operation. For the purposes of these determinations, the primary 
condenser operating as a reflux condenser on a distillation column, the 
primary condenser recovering monomer or solvent from a batch stripping 
operation, and the primary condenser recovering monomer or solvent from 
a batch distillation operation shall be considered part of the batch 
unit operation. All other devices that recover or oxidize organic HAP 
or TOC vapors shall be considered control devices as defined in 
Sec. 63.482.
    (3) The owner or operator of a batch front-end process vent 
complying with the flare provisions in Sec. 63.487(a)(1) or 
Sec. 63.487(b)(1) or routing the batch front-end process vent to a 
control device to comply with the requirements in Sec. 63.487(a)(2) or 
Sec. 63.487(b)(2) is not required to perform the batch front-end 
process vent group determination described in this section, but shall 
comply with all requirements applicable to Group 1 batch front-end 
process vents.
    (b) Determination of annual emissions. The owner or operator shall 
calculate annual uncontrolled TOC or organic HAP emissions for each 
batch front-end process vent using the methods described in paragraphs 
(b)(1) through (b)(8) of this section. Paragraphs (b)(1) through (b)(4) 
of this section present procedures that can be used to calculate the 
emissions from individual batch emission episodes. Emissions from batch 
front-end processes involving multicomponent systems are to be 
calculated using the procedures in paragraphs (b)(1) through (b)(4) of 
this section. Individual HAP partial pressures in multicomponent 
systems shall be determined by the following methods: If the components 
are miscible in one another, use Raoult's law to calculate the partial 
pressures; if the solution is a dilute aqueous mixture, use Henry's law 
constants to calculate partial pressures; if Raoult's law or Henry's 
law are not appropriate or available, use experimentally obtained 
activity coefficients, Henry's law constants, or solubility data; if 
Raoult's law or Henry's law are not appropriate, use models, such as 
the group-contribution models, to predict activity coefficients; and if 
Raoult's law or Henry's law are not appropriate, assume the components 
of the system behave independently and use the summation of all vapor 
pressures from the HAP's as the total HAP partial pressure. Chemical 
property data can be obtained from standard reference texts. Paragraph 
(b)(5) of this section describes how direct measurement can be used to 
estimate emissions. If the owner or operator can demonstrate that the 
procedures in paragraphs (b)(1) through (b)(4) of this section are not 
appropriate to estimate emissions from a batch front-end process 
emission episode, emissions may be estimated using engineering 
assessment, as described in paragraph (b)(6) of this section. Owners or 
operators are not required to demonstrate that direct measurement is

[[Page 46938]]

not appropriate before utilizing engineering assessment. Paragraph 
(b)(6)(ii) of this section describes how an owner or operator shall 
demonstrate that the procedures in paragraphs (b)(1) through (b)(4) of 
this section are not appropriate. Emissions from a batch cycle shall be 
calculated in accordance with paragraph (b)(7) of this section, and 
annual emissions from the batch front-end process vent shall be 
calculated in accordance with paragraph (b)(8) of this section.
    (1) TOC or organic HAP emissions from the purging of an empty 
vessel shall be calculated using Equation 1. This equation does not 
take into account evaporation of any residual liquid in the vessel.
[GRAPHIC] [TIFF OMITTED] TR05SE96.000

where:

Eepisode=Emissions, kg/episode.
Vves=Volume of vessel, m3.
P=TOC or total organic HAP partial pressure, kPa.
MWWAVG=Weighted average molecular weight of TOC or organic HAP in 
vapor, determined in accordance with paragraph (b)(4)(iii) of this 
section, kg/kmol.
R=Ideal gas constant, 8.314 m3kPa/kmol deg.K.
T=Temperature of vessel vapor space,  deg.K.
m=Number of volumes of purge gas used.

    (2) TOC or organic HAP emissions from the purging of a filled 
vessel shall be calculated using Equation 2.
[GRAPHIC] [TIFF OMITTED] TR05SE96.001

where:

Eepisode=Emissions, kg/episode.
y=Saturated mole fraction of all TOC or organic HAP in vapor phase.
Vdr=Volumetric gas displacement rate, m3/min.
P=Pressure in vessel vapor space, kPa.
MWWAVG=Weighted average molecular weight of TOC or organic HAP in 
vapor, determined in accordance with paragraph (b)(4)(iii) of this 
section, kg/kmol.
R=Ideal gas constant, 8.314 m3kPa/kmol deg.K.
T=Temperature of vessel vapor space,  deg.K.
Pi=Vapor pressure of TOC or individual organic HAP i, kPa.
xi=Mole fraction of TOC or organic HAP i in the liquid.
n=Number of organic HAP in stream.
    Note: Summation not required if TOC emissions are being estimated.
Tm=Minutes/episode.

    (3) Emissions from vapor displacement due to transfer of material 
into or out of a vessel shall be calculated using Equation 3.
[GRAPHIC] [TIFF OMITTED] TR05SE96.002

where:

Eepisode=Emissions, kg/episode.
y=Saturated mole fraction of all TOC or organic HAP in vapor phase.
V=Volume of gas displaced from the vessel, m3.
P=Pressure of vessel vapor space, kPa.
MWWAVG=Weighted average molecular weight of TOC or organic HAP in 
vapor, determined in accordance with paragraph (b)(4)(iii) of this 
section, kg/kmol.
R=Ideal gas constant, 8.314 m3kPa/kmol deg.K.
T=Temperature of vessel vapor space,  deg.K.
    (4) Emissions caused by the heating of a vessel shall be calculated 
using the procedures in either paragraph (b)(4)(i), (b)(4)(ii), or 
(b)(4)(iii) of this section, as appropriate.
    (i) If the final temperature to which the vessel contents is heated 
is lower than 50 K below the boiling point of the HAP in the vessel, 
then emissions shall be calculated using the equations in paragraphs 
(b)(4)(i)(A) through (b)(4)(i)(D) of this section.
    (A) Emissions caused by heating of a vessel shall be calculated 
using Equation 4. The assumptions made for this calculation are 
atmospheric pressure of 760 mm Hg and the displaced gas is always 
saturated with VOC vapor in equilibrium with the liquid mixture.

[[Page 46939]]

[GRAPHIC] [TIFF OMITTED] TR05SE96.003


where:

Eepisode=Emissions, kg/episode.
(Pi)T1, (Pi)T2=Partial pressure (kPa) TOC or each organic HAP 
in the vessel headspace at initial (T1) and final (T2) temperature.
n=Number of organic HAP in stream. Note: Summation not required if TOC 
emissions are being estimated.
=Number of kilogram-moles (kg-moles) of gas 
displaced, determined in accordance with paragraph (b)(4)(i)(B) of this 
section.
101.325=Constant, kPa.
(MWWAVG,T1), (MWWAVG,T2)=Weighted average molecular weight of 
TOC or organic HAP in vapor, determined in accordance with paragraph 
(b)(4)(iii) of this section.

    (B) The moles of gas displaced, , is calculated 
using equation 5.
[GRAPHIC] [TIFF OMITTED] TR05SE96.004

where:
=Number of kg-moles of gas displaced.
Vfs=Volume of free space in the vessel, m3.
R=Ideal gas constant, 8.314 m3kPa/kmolK.
Pa1=Initial noncondensible gas pressure in the vessel, kPa.
Pa2=Final noncondensible gas pressure, kPa.
T1=Initial temperature of vessel, K.
T2=Final temperature of vessel, K.
    (C) The initial and final pressure of the noncondensible gas in the 
vessel shall be calculated using equation 6.
[GRAPHIC] [TIFF OMITTED] TR05SE96.005

where:

Pa=Initial or final partial pressure of noncondensible gas in the 
vessel headspace, kPa.
101.325=Constant, kPa.
(Pi)T=Partial pressure of TOC or each organic HAP i in the vessel 
headspace, kPa, at the initial or final temperature (T1 or 
T2).
n=Number of organic HAP in stream. Note: Summation not required if TOC 
emissions are being estimated.

    (D) The weighted average molecular weight of organic HAP in the 
displaced gas, MWHAP, shall be calculated using equation 7:
[GRAPHIC] [TIFF OMITTED] TR05SE96.006

where:

c=TOC or organic HAP component
n=Number of TOC or organic HAP components in stream.

    (ii) If the vessel contents are heated to a temperature greater 
than 50 K below the boiling point, then emissions from the heating of a 
vessel shall be calculated as the sum of the emissions calculated in 
accordance with paragraphs (b)(4)(ii)(A) and (b)(4)(ii)(B) of this 
section.
    (A) For the interval from the initial temperature to the 
temperature 50 K below the boiling point, emissions shall be calculated 
using Equation 4, where T2 is the temperature 50 K below the 
boiling point.
    (B) For the interval from the temperature 50 K below the boiling 
point to the final temperature, emissions shall be calculated as the 
summation of emissions for each 5 K increment, where the emissions for 
each increment shall be calculated using Equation 4.
    (1) If the final temperature of the heatup is lower than 5 K below 
the boiling point, the final temperature for the last increment shall 
be the final temperature for the heatup, even if the last increment is 
less than 5 K.
    (2) If the final temperature of the heatup is higher than 5 K below 
the boiling point, the final temperature for the last increment shall 
be the temperature 5 K below the boiling point, even if the last 
increment is less than 5 K.
    (3) If the vessel contents are heated to the boiling point and the 
vessel is not operating with a condenser, the final temperature for the 
final increment shall be the temperature 5 K below the boiling point, 
even if the last increment is less than 5 K.
    (iii) If the vessel is operating with a condenser, and the vessel 
contents are heated to the boiling point, the primary condenser is 
considered part of the process, as described in Sec. 63.488(a)(2). 
Emissions shall be calculated as the sum of Equation 4, which 
calculates emissions due to heating the vessel contents to the 
temperature of the gas

[[Page 46940]]

exiting the condenser, and Equation 3, which calculates emissions due 
to the displacement of the remaining saturated noncondensible gas in 
the vessel. The final temperature in Equation 4 shall be set equal to 
the exit gas temperature of the condenser. Equation 3 shall be used as 
written below in Equation 3a, using free space volume, and T2 is 
set equal to the condenser exit gas temperature.
[GRAPHIC] [TIFF OMITTED] TR05SE96.007

where:

Eepisode=Organic HAP emissions, kg/episode.
yi=Saturated mole fraction of organic HAP in the vapor phase.
Vfs=Volume of the free space in the vessel, m3.
PT=Pressure of the vessel vapor space, kPa.
MWHAP=Weighted average molecular weight of organic HAP in vapor, 
determined in accordance with paragraph (b)(4)(iii) of this section.
R=Ideal gas constant, 8.314 m3kPa/kmolK.
T=Temperature of condenser exit stream K.
n=Number of organic HAP in stream.

    (5) The owner or operator may estimate annual emissions for a batch 
emission episode by direct measurement. If direct measurement is used, 
the owner or operator shall either perform a test for the duration of a 
representative batch emission episode or perform a test during only 
those periods of the batch emission episode for which the emission rate 
for the entire episode can be determined or for which the emissions are 
greater than the average emission rate of the batch emission episode. 
The owner or operator choosing either of these options must develop an 
emission profile for the entire batch emission episode, based on either 
process knowledge or test data collected, to demonstrate that test 
periods are representative. Examples of information that could 
constitute process knowledge include calculations based on material 
balances and process stoichiometry. Previous test results may be used 
provided the results are still relevant to the current batch process 
vent conditions. Performance tests shall follow the procedures 
specified in paragraphs (b)(5)(i) through (b)(5)(iii) of this section. 
The procedures in either paragraph (b)(5)(iv) or (b)(5)(v) of this 
section shall be used to calculate the emissions per batch emission 
episode.
    (i) Method 1 or 1A, as appropriate, shall be used for selection of 
the sampling sites if the flow measuring device is a pitot tube. No 
traverse is necessary when Method 2A or 2D is used to determine gas 
stream volumetric flow rate.
    (ii) Gas stream volumetric flow rate and/or average flow rate shall 
be determined as specified in paragraph (e) of this section.
    (iii) Method 18 or Method 25A, of 40 CFR part 60, appendix A, shall 
be used to determine the concentration of TOC or organic HAP, as 
appropriate. The use of Method 25A shall comply with paragraphs 
(b)(5)(iii)(A) and (b)(5)(iii)(B) of this section.
    (A) The organic HAP used as the calibration gas for Method 25A 
shall be the single organic HAP representing the largest percent by 
volume of the emissions.
    (B) The use of Method 25A is acceptable if the response from the 
high-level calibration gas is at least 20 times the standard deviation 
of the response from the zero calibration gas when the instrument is 
zeroed on the most sensitive scale.
    (iv) If an integrated sample is taken over the entire batch 
emission episode to determine TOC or average total organic HAP 
concentration, emissions shall be calculated using Equation 8.
[GRAPHIC] [TIFF OMITTED] TR05SE96.008

where:

Eepisode=Emissions, kg/episode
K=Constant, 2.494  x  10-6 (ppmv) -1 (gm-mole/scm) (kg/gm) 
(min/hr), where standard temperature is 20 deg.C.
Cj=Average concentration of TOC or sample organic HAP component j 
of the gas stream for the batch emission episode, dry basis, ppmv.
Mj=Molecular weight of TOC or sample component j of the gas 
stream, dry basis, gm/gm-mole.
AFR=Average flow rate of gas stream, dry basis, scmm.
Th=Hours/episode
n=Number of organic HAP in stream. Note: Summation not required if TOC 
emissions are being estimated using a TOC concentration measured using 
Method 25A.

    (v) If grab samples are taken to determine TOC or average total 
organic HAP concentration, emissions shall be calculated according to 
paragraphs (b)(5)(v)(A) and (b)(5)(v)(B) of this section.
    (A) For each measurement point, the emission rate shall be 
calculated using Equation 9.
[GRAPHIC] [TIFF OMITTED] TR05SE96.009

where:

Epoint=Emission rate for individual measurement point, kg/hr.
K=Constant, 2.494  x  10-6 (ppmv)-1 (gm-mole/scm) (kg/gm) 
(min/hr), where standard temperature is 20 deg.C.
Cj=Concentration of TOC or sample component j of the gas stream, 
dry basis, ppmv.
Mj=Molecular weight of TOC or sample component j of the gas 
stream, gm/gm-mole.
FR=Flow rate of gas stream for the measurement point, dry basis, scmm.
n=Number of organic HAP in stream. Note: Summation not required if TOC 
emissions are being estimated using a TOC concentration measured using 
Method 25A.

    (B) The emissions per batch emission episode shall be calculated 
using Equation 10.
[GRAPHIC] [TIFF OMITTED] TR05SE96.010

where:

Eepisode=Emissions, kg/episode.
DUR=Duration of the batch emission episode, hr/episode.
Ei=Emissions for measurement point i, kg/hr.
n=Number of measurements.
    (6) If the owner or operator can demonstrate that the methods in 
paragraphs (b)(1) through (b)(4) of this section are not appropriate to 
estimate emissions for a batch emissions episode, the owner or operator 
may use engineering assessment to estimate emissions as specified in 
paragraphs (b)(6)(i) and (b)(6)(ii) of this section. All data, 
assumptions, and procedures used in an engineering assessment shall be 
documented.
    (i) Engineering assessment includes, but is not limited to, the 
following:
    (A) Previous test results, provided the tests are representative of 
current operating practices.
    (B) Bench-scale or pilot-scale test data representative of the 
process under representative operating conditions.
    (C) Flow rate, TOC emission rate, or organic HAP emission rate 
specified or implied within a permit limit applicable to the batch 
front-end process vent.
    (D) Design analysis based on accepted chemical engineering 
principles, measurable process parameters, or physical or chemical laws 
or properties. Examples of analytical methods include, but are not 
limited to:

[[Page 46941]]

    (1) Use of material balances,
    (2) Estimation of flow rate based on physical equipment design, 
such as pump or blower capacities, and
    (3) Estimation of TOC or organic HAP concentrations based on 
saturation conditions.
    (ii) The emissions estimation equations in paragraphs (b)(1) 
through (b)(4) of this section shall be considered inappropriate for 
estimating emissions for a given batch emissions episode if one or more 
of the criteria in paragraphs (b)(6)(ii)(A) through (b)(6)(ii)(B) of 
this section are met.
    (A) Previous test data are available that show a greater than 20 
percent discrepancy between the test value and the estimated value.
    (B) The owner or operator can demonstrate to the Administrator 
through any other means that the emissions estimation equations are not 
appropriate for a given batch emissions episode.
    (C) Data or other information supporting a finding that the 
emissions estimation equations are inappropriate as specified under 
paragraph (b)(6)(ii)(A) of this section shall be reported in the 
Notification of Compliance Status, as required in Sec. 63.506(e)(5).
    (D) Data or other information supporting a finding that the 
emissions estimation equations are inappropriate as specified under 
paragraph (b)(6)(ii)(B) of this section shall be reported in the 
Precompliance Report, as required in Sec. 63.506(e)(3).
    (7) For each batch front-end process vent, the TOC or organic HAP 
emissions associated with a single batch cycle shall be calculated 
using Equation 11.
[GRAPHIC] [TIFF OMITTED] TR05SE96.011

where:

Ecycle=Emissions for an individual batch cycle, kg/batch cycle.
Eepisodei=Emissions from a batch emission episode i, kg/episode.
n=Number of batch emission episodes for the batch cycle.

    (8) Annual TOC or organic HAP emissions from a batch front-end 
process vent shall be calculated using Equation 12.
[GRAPHIC] [TIFF OMITTED] TR05SE96.012

where:

AE=Annual emissions from a batch front-end process vent, kg/yr.
Ni=Number of type i batch cycles performed annually, cycles/year.
Ecyclei=Emissions from the batch front-end process vent associated 
with single type i batch cycle, as determined in paragraph (b)(7) of 
this section, kg/batch cycle.
n=Number of different types of batch cycles that cause the emission of 
TOC or organic HAP from the batch front-end process vent.

    (c) [Reserved]
    (d) Minimum emission level exemption. A batch front-end process 
vent with annual emissions less than 11,800 kg/yr is considered a Group 
2 batch front-end process vent and the owner or operator of that batch 
front-end process vent shall comply with the requirements in 
Sec. 63.487 (f) or (g). The owner or operator of that batch front-end 
process vent is not required to comply with the provisions in 
paragraphs (e) through (g) of this section.
    (e) Determination of average flow rate. The owner or operator shall 
determine the average flow rate for each batch emission episode in 
accordance with one of the procedures provided in paragraphs (e)(1) 
through (e)(2) of this section. The annual average flow rate for a 
batch front-end process vent shall be calculated as specified in 
paragraph (e)(3) of this section.
    (1) Determination of the average flow rate for a batch emission 
episode by direct measurement shall be made using the procedures 
specified in paragraphs (e)(1)(i) through (e)(1)(iii) of this section.
    (i) The vent stream volumetric flow rate (Qs) for a batch 
emission episode, in scmm at 20  deg.C, shall be determined using 
Method 2, 2A, 2C, or 2D of 40 CFR part 60, appendix A, as appropriate.
    (ii) The volumetric flow rate of a representative batch emission 
episode shall be measured every 15 minutes.
    (iii) The average flow rate for a batch emission episode shall be 
calculated using Equation 13.
[GRAPHIC] [TIFF OMITTED] TR05SE96.013

where:

AFRepisode=Average flow rate for the batch emission episode, scmm.
FRi=Flow rate for individual measurement i, scmm.
n=Number of flow rate measurements taken during the batch emission 
episode.

    (2) The average flow rate for a batch emission episode may be 
determined by engineering assessment, as defined in paragraph (b)(6)(i) 
of this section. All data, assumptions, and procedures used shall be 
documented.
    (3) The annual average flow rate for a batch front-end process vent 
shall be calculated using Equation 14.
[GRAPHIC] [TIFF OMITTED] TR05SE96.014

where:

AFR=Annual average flow rate for the batch front-end process vent, 
scmm.
DURi=Duration of type i batch emission episodes annually, hr/yr.
AFRepisode,i=Average flow rate for type i batch emission episode, 
scmm.
n=Number of types of batch emission episodes venting from the batch 
front-end process vent.

    (f) Determination of cutoff flow rate. For each batch front-end 
process vent, the owner or operator shall calculate the cutoff flow 
rate using Equation 15.
[GRAPHIC] [TIFF OMITTED] TR05SE96.015

where:

CFR=Cutoff flow rate, scmm.
AE=Annual TOC or organic HAP emissions, as determined in paragraph 
(b)(8) of this section, kg/yr.

    (g) Group 1/Group 2 status determination. The owner or operator 
shall compare the cutoff flow rate, calculated in accordance with 
paragraph (f) of this section, with the annual average flow rate, 
determined in accordance with paragraph (e)(3) of this section. The 
group determination status for each batch front-end process vent shall 
be made using the criteria specified in paragraphs (g)(1) and (g)(2) of 
this section.
    (1) If the cutoff flow rate is greater than or equal to the annual 
average flow rate of the stream, the batch front-end process vent is 
classified as a Group 1 batch front-end process vent.
    (2) If the cutoff flow rate is less than the annual average flow 
rate of the stream, the batch front-end process vent is classified as a 
Group 2 batch front-end process vent.
    (h) Determination of halogenation status. To determine whether a 
batch front-end process vent or an aggregate batch vent stream is 
halogenated, the annual mass emission rate of halogen atoms contained 
in organic compounds shall be calculated using the procedures specified 
in paragraphs (h)(1) through (h)(3) of this section.
    (1) The concentration of each organic compound containing halogen 
atoms (ppmv, by compound) for each batch emission episode shall be 
determined based on the following procedures:

[[Page 46942]]

    (i) Process knowledge that no halogens or hydrogen halides are 
present in the process may be used to demonstrate that a batch emission 
episode is nonhalogenated. Halogens or hydrogen halides that are 
unintentionally introduced into the process shall not be considered in 
making a finding that a batch emission episode is nonhalogenated.
    (ii) Engineering assessment as discussed in paragraph (b)(6)(i) of 
this section.
    (iii) Concentration of organic compounds containing halogens and 
hydrogen halides as measured by Method 26 or 26A of 40 CFR part 60, 
appendix A.
    (iv) Any other method or data that has been validated according to 
the applicable procedures in Method 301 of appendix A of this part.
    (2) The annual mass emissions of halogen atoms for a batch front-
end process vent shall be calculated using Equation 16.
[GRAPHIC] [TIFF OMITTED] TR05SE96.016

where:

Ehalogen=Mass of halogen atoms, dry basis, kg/yr.
K=Constant, 0.022 (ppmv)-1 (kg-mole per scm) (min/yr), where 
standard temperature is 20 deg.C.
AFR=Annual average flow rate of the batch front-end process vent, 
determined according to paragraph (e) of this section, scmm.
Mj,i=Molecular weight of halogen atom i in compound j, kg/kg-mole.
Lj,i=Number of atoms of halogen i in compound j.
n=Number of halogenated compounds j in the batch front-end process 
vent.
m=Number of different halogens i in each compound j of the batch front-
end process vent.

Cavgj=Average annual concentration of halogenated compound j in 
the batch front-end process vent, as determined by using Equation 17, 
dry basis, ppmv.
[GRAPHIC] [TIFF OMITTED] TR05SE96.017

where:

DURi=Duration of type i batch emission episodes annually, hr/yr.
Ci=Average concentration of halogenated compound j in type i batch 
emission episode, ppmv.
n=Number of types of batch emission episodes venting from the batch 
front-end process vent.
    (3) The annual mass emissions of halogen atoms for an aggregate 
batch vent stream shall be the sum of the annual mass emissions of 
halogen atoms for all batch front-end process vents included in the 
aggregate batch vent stream.
    (i) Process changes affecting Group 2 batch front-end process 
vents. Whenever process changes, as described in paragraph (i)(1) of 
this section, are made that affect one or more Group 2 batch front-end 
process vents, the owner or operator shall comply with paragraphs 
(i)(2) and (i)(3) of this section.
    (1) Examples of process changes include, but are not limited to, 
changes in production capacity, production rate, feedstock type, or 
catalyst type; or whenever there is replacement, removal, or 
modification of recovery equipment considered part of the batch unit 
operation as specified in paragraph (a)(2) of this section. An increase 
in the annual number of batch cycles beyond the batch cycle limitation 
constitutes a process change. For purposes of this paragraph, process 
changes do not include: Process upsets; unintentional, temporary 
process changes; and changes that are within the margin of variation on 
which the original group determination was based.
    (2) For each batch front-end process vent affected by a process 
change, the owner or operator shall redetermine the group status by 
repeating the procedures specified in paragraphs (b) through (g) of 
this section, as applicable. Alternatively, engineering assessment, as 
described in paragraph (b)(6)(i) of this section, can be used to 
determine the effects of the process change.
    (3) Based on the results of paragraph (i)(2) of this section, 
owners or operators shall comply with either paragraph (i)(3) (i), 
(ii), or (iii) of this section.
    (i) If the redetermination described in paragraph (i)(2) of this 
section indicates that a Group 2 batch front-end process vent has 
become a Group 1 batch front-end process vent as a result of the 
process change, the owner or operator shall submit a report as 
specified in Sec. 63.492(b) and shall comply with the Group 1 
provisions in Sec. 63.487 through Sec. 63.492 in accordance with the 
compliance schedule described in Sec. 63.506(e)(6)(iii)(D)(2).
    (ii) If the redetermination described in paragraph (i)(2) of this 
section indicates that a Group 2 batch front-end process vent with 
annual emissions less than the applicable level specified in paragraph 
(d) of this section, and that is in compliance with Sec. 63.487(g), now 
has annual emissions greater than or equal to the applicable level 
specified by paragraph (d) of this section but remains a Group 2 batch 
front-end process vent, the owner or operator shall submit a report as 
specified in Sec. 63.492(c) and shall comply with Sec. 63.487(f) in 
accordance with the compliance schedule required by 
Sec. 63.506(e)(6)(iii)(D)(2).
    (iii) If the redetermination described in paragraph (i)(2) of this 
section indicates no change in group status or no change in the 
relation of annual emissions to the levels specified in paragraph (d) 
of this section, the owner or operator is not required to submit a 
report, as described in Sec. 63.492(d).


Sec. 63.489  Batch front-end process vents--monitoring requirements.

    (a) General requirements. Each owner or operator of a batch front-
end process vent or aggregate batch vent stream that uses a control 
device to comply with the

[[Page 46943]]

requirements in Sec. 63.487(a)(2) or Sec. 63.487(b)(2) shall install 
the monitoring equipment specified in paragraph (b) of this section.
    (1) This monitoring equipment shall be in operation at all times 
when batch emission episodes, or portions thereof, that the owner or 
operator has selected to control are vented to the control device, or 
at all times when an aggregate batch vent stream is vented to the 
control device.
    (2) The owner or operator shall operate control devices such that 
monitored parameters remain above the minimum level or below the 
maximum level, as appropriate, established as specified in paragraph 
(e) of this section.
    (b) Batch front-end process vent and aggregate batch vent stream 
monitoring parameters. The monitoring equipment specified in paragraphs 
(b)(1) through (b)(8) of this section shall be installed as specified 
in paragraph (a) of this section. The parameters to be monitored are 
specified in Table 6 of this subpart.
    (1) Where an incinerator is used, a temperature monitoring device 
equipped with a continuous recorder is required.
    (i) Where an incinerator other than a catalytic incinerator is 
used, the temperature monitoring device shall be installed in the 
firebox or in the ductwork immediately downstream of the firebox in a 
position before any substantial heat exchange occurs.
    (ii) Where a catalytic incinerator is used, temperature monitoring 
devices shall be installed in the gas stream immediately before and 
after the catalyst bed.
    (2) Where a flare is used, a device (including, but not limited to, 
a thermocouple, ultra-violet beam sensor, or infrared sensor) capable 
of continuously detecting the presence of a pilot flame is required.
    (3) Where a boiler or process heater of less than 44 megawatts 
design heat input capacity is used, a temperature monitoring device in 
the firebox equipped with a continuous recorder is required. Any boiler 
or process heater in which all batch front-end process vents or 
aggregate batch vent streams are introduced with the primary fuel or 
are used as the primary fuel is exempt from this requirement.
    (4) Where a scrubber is used with an incinerator, boiler, or 
process heater in concert with the combustion of halogenated batch 
front-end process vents, the following monitoring equipment is required 
for the scrubber:
    (i) A pH monitoring device equipped with a continuous recorder to 
monitor the pH of the scrubber effluent; and
    (ii) A flow meter equipped with a continuous recorder shall be 
located at the scrubber influent to monitor the scrubber liquid flow 
rate.
    (5) Where an absorber is used, a scrubbing liquid temperature 
monitoring device and a specific gravity monitoring device are 
required, each equipped with a continuous recorder.
    (6) Where a condenser is used, a condenser exit temperature 
(product side) monitoring device equipped with a continuous recorder is 
required.
    (7) Where a carbon adsorber is used, an integrating regeneration 
stream flow monitoring device having an accuracy of 10 
percent, capable of recording the total regeneration stream mass flow 
for each regeneration cycle; and a carbon bed temperature monitoring 
device, capable of recording the carbon bed temperature after each 
regeneration and within 15 minutes of completing any cooling cycle are 
required.
    (8) As an alternate to paragraphs (b)(5) through (b)(7) of this 
section, the owner or operator may install an organic monitoring device 
equipped with a continuous recorder.
    (c) Alternative monitoring parameters. An owner or operator of a 
batch front-end process vent or aggregate batch vent stream may request 
approval to monitor parameters other than those required by paragraph 
(b) of this section. The request shall be submitted according to the 
procedures specified in Sec. 63.506(f). Approval shall be requested if 
the owner or operator:
    (1) Uses a control device other than those included in paragraph 
(b) of this section; or
    (2) Uses one of the control devices included in paragraph (b) of 
this section, but seeks to monitor a parameter other than those 
specified in Table 6 of this subpart and paragraph (b) of this section.
    (d) Monitoring of bypass lines. The owner or operator of a batch 
front-end process vent or aggregate batch vent stream using a vent 
system that contains bypass lines that could divert emissions away from 
a control device used to comply with Sec. 63.487(a) or Sec. 63.487(b) 
shall comply with either paragraph (d)(1), (d)(2), or (d)(3) of this 
section. Equipment such as low leg drains, high point bleeds, analyzer 
vents, open-ended valves or lines, and pressure relief valves needed 
for safety purposes are not subject to this paragraph.
    (1) Properly install, maintain, and operate a flow indicator that 
takes a reading at least once every 15 minutes. Records shall be 
generated as specified in Sec. 63.491(e)(3). The flow indicator shall 
be installed at the entrance to any bypass line that could divert 
emissions away from the control device and to the atmosphere; or
    (2) Secure the bypass line valve in the non-diverting position with 
a car-seal or a lock-and-key type configuration. A visual inspection of 
the seal or closure mechanism shall be performed at least once every 
month to ensure that the valve is maintained in the non-diverting 
position and emissions are not diverted through the bypass line. 
Records shall be generated as specified in Sec. 63.491(e)(4).
    (3) Continuously monitor the bypass line damper or valve position 
using computer monitoring and record any periods when the position of 
the bypass line damper or valve has changed as specified in 
Sec. 63.491(e)(4).
    (e) Establishment of parameter monitoring levels. Parameter 
monitoring levels for batch front-end process vents and aggregate batch 
vent streams shall be established as specified in paragraphs (e)(1) 
through (e)(3) of this section.
    (1) For each parameter monitored under paragraph (b) of this 
section, the owner or operator shall establish a level, defined as 
either a maximum or minimum operating parameter as denoted in Table 7 
of this subpart, that indicates proper operation of the control device. 
The level shall be established in accordance with the procedures 
specified in Sec. 63.505.
    (i) For batch front-end process vents using a control device to 
comply with Sec. 63.487(a)(2), the established level shall reflect the 
control efficiency established as part of the initial compliance 
demonstration specified in Sec. 63.490(c)(2).
    (ii) For aggregate batch vent streams using a control device to 
comply with Sec. 63.487(b)(2), the established level shall reflect the 
control efficiency requirement specified in Sec. 63.487(b)(2).
    (2) The established level, along with supporting documentation, 
shall be submitted in the Notification of Compliance Status or the 
operating permit application as required in Sec. 63.506(e)(5) or 
Sec. 63.506(e)(8), respectively.
    (3) The operating day shall be defined as part of establishing the 
parameter monitoring level and shall be submitted with the information 
in paragraph (e)(2) of this section. The definition of operating day 
shall specify the times at which an operating day begins and ends. The 
operating day shall not exceed 24 hours.

[[Page 46944]]

Sec. 63.490  Batch front-end process vents--performance test methods 
and procedures to determine compliance.

    (a) Use of a flare. When a flare is used to comply with 
Sec. 63.487(a)(1) or Sec. 63.487(b)(1), the owner or operator shall 
comply with the flare provisions in Sec. 63.11(b) of subpart A.
    (b) Exceptions to performance tests. An owner or operator is not 
required to conduct a performance test when a control device specified 
in paragraphs (b)(1) through (b)(4) of this section is used to comply 
with Sec. 63.487(a)(2).
    (1) A boiler or process heater with a design heat input capacity of 
44 megawatts or greater.
    (2) A boiler or process heater where the vent stream is introduced 
with the primary fuel or is used as the primary fuel.
    (3) A control device for which a performance test was conducted for 
determining compliance with a new source performance standard (NSPS) 
and the test was conducted using the same procedures specified in this 
section and no process changes have been made since the test.
    (4) A boiler or process heater burning hazardous waste for which 
the owner or operator:
    (i) Has been issued a final permit under 40 CFR part 270 and 
complies with the requirements of 40 CFR part 266, subpart H; or
    (ii) Has certified compliance with the interim status requirements 
of 40 CFR part 266, subpart H.
    (5) An incinerator burning hazardous waste for which the owner or 
operator complies with the requirements of 40 CFR part 264, subpart O.
    (6) Performance tests done for other subparts in part 60 or part 63 
where total organic HAP or TOC was measured, provided that the owner or 
operator can demonstrate that operating conditions for the process and 
control device during the performance test are representative of 
current operating conditions.
    (c) Batch front-end process vent testing and procedures for 
compliance with Sec. 63.487(a)(2). Except as provided in paragraph (b) 
of this section, an owner or operator using a control device to comply 
with Sec. 63.487(a)(2) shall conduct a performance test using the 
procedures specified in paragraph (c)(1) of this section in order to 
determine the control efficiency of the control device. An owner or 
operator shall determine the percent reduction for the batch cycle 
using the control efficiency of the control device as specified in 
paragraphs (c)(2)(i) through (c)(2)(iii) of this section and the 
procedures specified in paragraph (c)(2) of this section. Compliance 
may be based on either total organic HAP or TOC. For purposes of this 
paragraph and all paragraphs that are part of paragraph (c) of this 
section, the term ``batch emission episode'' shall have the meaning 
``period of the batch emission episode selected for control,'' which 
may be the entire batch emission episode or may only be a portion of 
the batch emission episode.
    (1) Performance tests shall be conducted as specified in paragraphs 
(c)(1)(i) through (c)(1)(v) of this section.
    (i) Except as specified in paragraph (c)(1)(i)(A) of this section, 
a test shall be performed for the entire period of each batch emission 
episode in the batch cycle that the owner or operator selects to 
control as part of achieving the required 90 percent emission reduction 
for the batch cycle specified in Sec. 63.487(a)(2). Only one test is 
required for each batch emission episode selected by the owner or 
operator for control. The owner or operator shall follow the procedures 
listed in paragraphs (c)(1)(i)(B) through (c)(1)(i)(D) of this section.
    (A) Alternatively, an owner or operator may choose to test only 
those periods of the batch emission episode during which the emission 
rate for the entire episode can be determined or during which the 
emissions are greater than the average emission rate of the batch 
emission episode. The owner or operator choosing either of these 
options must develop an emission profile for the entire batch emission 
episode, based on either process knowledge or test data collected, to 
demonstrate that test periods are representative. Examples of 
information that could constitute process knowledge include 
calculations based on material balances and process stoichiometry. 
Previous test results may be used, provided the results are still 
relevant to the current batch front-end process vent conditions.
    (B) Method 1 or 1A, as appropriate, shall be used for selection of 
the sampling sites if the flow measuring device is a pitot tube. No 
traverse is necessary when Method 2A or 2D is used to determine gas 
stream volumetric flow rate. Inlet sampling sites shall be located as 
specified in paragraphs (c)(1)(i)(B)(1) and (c)(1)(i)(B)(2) of this 
section. Outlet sampling sites shall be located at the outlet of the 
final control device prior to release to the atmosphere.
    (1) The control device inlet sampling site shall be located at the 
exit from the batch unit operation before any control device. Section 
63.488(a)(2) describes those recovery devices considered part of the 
unit operation. Inlet sampling sites would be after these specified 
recovery devices.
    (2) If a batch process vent is introduced with the combustion air 
or as a secondary fuel into a boiler or process heater with a design 
capacity less than 44 megawatts, selection of the location of the inlet 
sampling sites shall ensure the measurement of total organic HAP or TOC 
(minus methane and ethane) concentrations in all batch front-end 
process vents and primary and secondary fuels introduced into the 
boiler or process heater.
    (C) Gas stream volumetric flow rate and/or average flow rate shall 
be determined as specified in Sec. 63.488(e).
    (D) Method 18 or Method 25A of 40 CFR part 60, Appendix A, shall be 
used to determine the concentration of organic HAP or TOC, as 
appropriate. The use of Method 25A shall comply with paragraphs 
(c)(1)(i)(D)(1) and (c)(1)(i)(D)(2) of this section.
    (1) The organic HAP used as the calibration gas for Method 25A 
shall be the single organic HAP representing the largest percent by 
volume of the emissions.
    (2) The use of Method 25A is acceptable if the response from the 
high-level calibration gas is at least 20 times the standard deviation 
of the response from the zero calibration gas when the instrument is 
zeroed on the most sensitive scale.
    (ii) If an integrated sample is taken over the entire batch 
emission episode to determine TOC or average total organic HAP 
concentration, emissions per batch emission episode shall be calculated 
using Equations 18 and 19.
[GRAPHIC] [TIFF OMITTED] TR05SE96.018


[[Page 46945]]

[GRAPHIC] [TIFF OMITTED] TR05SE96.019


where:

Eepisode=Inlet or outlet emissions, kg/episode.
K=Constant, 2.494  x  10-6 (ppmv)-1 (gm-mole/scm) (kg/gm) 
(min/hr), where standard temperature is 20 deg.C.
Cj=Average inlet or outlet concentration of TOC or sample 
component j of the gas stream for the batch emission episode, dry 
basis, ppmv.
Mj=Molecular weight of TOC or sample component j of the gas 
stream, gm/gm-mole.
AFR=Average inlet or outlet flow rate of gas stream for the batch 
emission episode, dry basis, scmm.
Th=Hours/episode.
n=Number of organic HAP in stream. Note: Summation not required if TOC 
emissions are being estimated using a TOC concentration measured using 
Method 25A.

    (iii) If grab samples are taken to determine TOC or total organic 
HAP concentration, emissions shall be calculated according to 
paragraphs (c)(1)(iii)(A) and (c)(1)(iii)(B) of this section.
    (A) For each measurement point, the emission rates shall be 
calculated using Equations 20 and 21.
[GRAPHIC] [TIFF OMITTED] TR05SE96.020

[GRAPHIC] [TIFF OMITTED] TR05SE96.050

where:

Epoint=Inlet or outlet emission rate for the measurement point, 
kg/hr.
K=Constant, 2.494 x 10-6 (ppmv)-1 (gm-mole/scm) (kg/gm) (min/
hr), where standard temperature is 20 deg.C.
Cj=Inlet or outlet concentration of TOC or sample organic HAP 
component j of the gas stream, dry basis, ppmv.
Mj=Molecular weight of TOC or sample organic HAP component j of 
the gas stream, gm/gm-mole.
FR=Inlet or outlet flow rate of gas stream for the measurement point, 
dry basis, scmm.
n=Number of organic HAP in stream.

    Note: Summation not required if TOC emissions are being 
estimated using a TOC concentration measured using Method 25A.

    (B) The emissions per batch emission episode shall be calculated 
using Equations 22 and 23.
[GRAPHIC] [TIFF OMITTED] TR05SE96.021

[GRAPHIC] [TIFF OMITTED] TR05SE96.022

where:

Eepisode=Inlet or outlet emissions, kg/episode.
DUR=Duration of the batch emission episode, hr/episode.
Epoint,i=Inlet or outlet emissions for measurement point i, kg/hr.
n=Number of measurements.

    (iv) The control efficiency for the control device shall be 
calculated using Equation 24.
[GRAPHIC] [TIFF OMITTED] TR05SE96.023

Where:

R=Control efficiency of control device, percent.
Einleti=Mass rate of TOC or total organic HAP for batch emission 
episode i at the inlet to the control device as calculated under 
paragraph (c)(1)(ii) or (c)(1)(iii) of this section, kg/hr.
Eoutleti=Mass rate of TOC or total organic HAP for batch emission 
episode i at the outlet of the control device, as calculated under 
paragraph (c)(1)(ii) or (c)(1)(iii) of this section, kg/hr.
n=Number of batch emission episodes in the batch cycle selected to be 
controlled.

    (v) If the batch front-end process vent entering a boiler or 
process heater with a design capacity less than 44 megawatts is 
introduced with the combustion air or as a secondary fuel, the weight-
percent reduction of total organic HAP or TOC across the device shall 
be determined by comparing the TOC or total organic HAP in all 
combusted batch front-end process vents and primary and secondary fuels 
with the TOC or total organic HAP exiting the combustion device, 
respectively.
    (2) The percent reduction for the batch cycle shall be determined 
using Equation 25 and the control device efficiencies specified in 
paragraphs (c)(2)(i) through (c)(2)(iii) of this section. All 
information used to calculate the batch cycle percent reduction, 
including a definition of the batch cycle identifying all batch 
emission episodes, must be recorded as specified in Sec. 63.491(b)(2). 
This information shall include identification of those batch emission 
episodes, or portions thereof, selected for control.

[[Page 46946]]

[GRAPHIC] [TIFF OMITTED] TR05SE96.024


where:
Eunc=Mass rate of TOC or total organic HAP for uncontrolled batch 
emission episode i, kg/hr.
Einletcon=Mass rate of TOC or total organic HAP for controlled 
batch emission episode i at the inlet to the control device, kg/hr.
R=Control efficiency of control device as specified in paragraphs 
(c)(2)(i) through (c)(2)(iii) of this section.
n=Number of uncontrolled batch emission episodes, controlled batch 
emission episodes, and control devices. The value of n is not 
necessarily the same for these three items.
    (i) If a performance test is required by paragraph (c) of this 
section, the control efficiency of the control device shall be as 
determined in paragraph (c)(1)(iv) of this section.
    (ii) If a performance test is not required by paragraph (c) of this 
section for a combustion control device, as specified in paragraph (b) 
of this section, the control efficiency of the control device shall be 
98 percent. The control efficiency for a flare shall be 98 percent.
    (iii) If a performance test is not required by paragraph (c) of 
this section for a noncombustion control device, the control efficiency 
shall be determined by the owner or operator based on engineering 
assessment.
    (d) Batch process vent and aggregate batch vent stream testing for 
compliance with Sec. 63.487(c) [halogenated emission streams]. An owner 
or operator controlling halogenated emissions in compliance with 
Sec. 63.487(c) shall conduct a performance test to determine compliance 
with the control efficiency specified in Sec. 63.487(c)(1) or the 
emission limit specified in Sec. 63.487(c)(2) for hydrogen halides and 
halogens.
    (1) Sampling sites shall be located at the inlet and outlet of the 
scrubber or other control device used to reduce halogen emissions in 
complying with Sec. 63.487(c)(1) or at the outlet of the control device 
used to reduce halogen emissions in complying with Sec. 63.487(c)(2).
    (2) The mass emissions of each hydrogen halide and halogen compound 
for the batch cycle or aggregate batch vent stream shall be calculated 
from the measured concentrations and the gas stream flow rate(s) 
determined by the procedures specified in paragraphs (d)(2)(i) and 
(d)(2)(ii) of this section, except as specified in paragraph (d)(5) of 
this section.
    (i) Method 26 or Method 26A of 40 CFR part 60, appendix A, shall be 
used to determine the concentration, in Mg per dry scm, of total 
hydrogen halides and halogens present in the emissions stream.
    (ii) Gas stream volumetric flow rate and/or average flow rate shall 
be determined as specified in Sec. 63.488(e).
    (3) To determine compliance with the percent reduction specified in 
Sec. 63.487(c)(1), the mass emissions for any hydrogen halides and 
halogens present at the inlet of the scrubber or other control device 
shall be summed together. The mass emissions of any hydrogen halides or 
halogens present at the outlet of the scrubber or other control device 
shall be summed together. Percent reduction shall be determined by 
subtracting the outlet mass emissions from the inlet mass emissions and 
then dividing the result by the inlet mass emissions.
    (4) To determine compliance with the emission limit specified in 
Sec. 63.487(c)(2), the annual mass emissions for any hydrogen halides 
and halogens present at the outlet of the control device and prior to 
any combustion device shall be summed together and compared to the 
emission limit specified in Sec. 63.487(c)(2).
    (5) The owner or operator may use any other method to demonstrate 
compliance if the method or data has been validated according to the 
applicable procedures of Method 301 of appendix A.
    (e) Aggregate batch vent stream testing for compliance with 
Sec. 63.487(b)(2). Owners or operators of aggregate batch vent streams 
complying with Sec. 63.487(b)(2) shall conduct a performance test using 
the performance testing procedures for continuous front-end process 
vents in Sec. 63.116(c) of subpart G. For the purposes of this subpart, 
when the provisions of Sec. 63.116(c) specify that Method 18 shall be 
used, Method 18 or Method 25A may be used. The use of Method 25A shall 
comply with paragraphs (e)(1) and (e)(2) of this section.
    (1) The organic HAP used as the calibration gas for Method 25A 
shall be the single organic HAP representing the largest percent by 
volume of the emissions.
    (2) The use of Method 25A is acceptable if the response from the 
high-level calibration gas is at least 20 times the standard deviation 
of the response from the zero calibration gas when the instrument is 
zeroed on the most sensitive scale.
    (f) Batch cycle limitation. The batch cycle limitation required by 
Sec. 63.487(f)(1) and Sec. 63.487(g)(1) shall be established as 
specified in paragraph (f)(1) of this section and shall include the 
elements specified in paragraph (f)(2) of this section.
    (1) The batch cycle limitation shall be determined by the owner or 
operator such that annual emissions for the batch front-end process 
vent remain less than the level specified in Sec. 63.488(d) when 
complying with Sec. 63.487(g). Alternatively, when complying with 
Sec. 63.487(f), the batch cycle limitation shall ensure that annual 
emissions remain at a level such that the batch front-end process vent 
remains a Group 2 batch front-end process vent, given the actual annual 
flow rate for that batch front-end process vent determined according to 
Sec. 63.488(e)(3). The batch cycle limitation shall be determined using 
the same basis, as described in Sec. 63.488(a)(1), used to make the 
group determination (i.e., expected mix of products or worst-case HAP 
emitting product). The establishment of the batch cycle limitation is 
not dependent upon any past production or activity level.
    (i) If the expected mix of products serves as the basis for the 
batch cycle limitation, the batch cycle limitation shall be determined 
such that any foreseeable combination of products which the owner or 
operator desires the flexibility to manufacture shall be allowed. 
Combinations of products not accounted for in the documentation 
required by paragraph (f)(2)(iv) of this section shall not be allowed 
within the restrictions of the batch cycle limitation.
    (ii) If, for a batch front-end process vent with more than one 
product, a single worst-case HAP emitting product serves as the basis 
for the batch cycle limitation, the batch cycle limitation shall be 
determined such that the maximum number of batch cycles the owner or 
operator desires the flexibility to accomplish, using the worst-case

[[Page 46947]]

HAP emitting product and ensuring that the batch front-end process vent 
remains a Group 2 batch front-end process vent or that emissions remain 
less than the level specified in Sec. 63.488(d), shall be allowed. This 
value shall be the total number of batch cycles allowed within the 
restrictions of the batch cycle limitation regardless of which products 
are manufactured.
    (2) Documentation supporting the establishment of the batch cycle 
limitation shall include the information specified in paragraphs 
(f)(2)(i) through (f)(2)(v) of this section, as appropriate.
    (i) Identification that the purpose of the batch cycle limitation 
is to comply with Sec. 63.487(f)(1) or (g)(1).
    (ii) Identification that the batch cycle limitation is based on a 
single worst-case HAP emitting product or on the expected mix of 
products for the batch front-end process vent as allowed under 
Sec. 63.488(a)(1).
    (iii) Definition of the operating year, for the purposes of 
determining compliance with the batch cycle limitation.
    (iv) If the batch cycle limitation is based on a single worst-case 
HAP emitting product, documentation specified in Sec. 63.488(a)(1)(ii) 
describing how the single product meets the requirements for worst-case 
HAP emitting product, as specified in Sec. 63.488(a)(1) and the number 
of batch cycles allowed under the batch cycle limitation for each 
product associated with the batch front-end process vent are required.
    (v) If the batch cycle limitation is based on the expected mix of 
products, the owner or operator shall provide documentation that 
describes as many scenarios for differing mixes of products (i.e., how 
many of each type of product) that the owner or operator desires the 
flexibility to accomplish. Alternatively, the owner or operator shall 
provide a description of the relationship among the mix of products 
that will allow a determination of compliance with the batch cycle 
limitation under an infinite number of scenarios. For example, if a 
batch process vent has two products, each product has the same flow 
rate and emits for the same amount of time, and product No. 1 has twice 
the emissions as product No. 2, the relationship describing an infinite 
number of scenarios would be that the owner or operator can accomplish 
two batch cycles of product No. 2 for each batch cycle of product No. 1 
within the restriction of the batch cycle limitation.


Sec. 63.491  Batch front-end process vents--recordkeeping requirements.

    (a) Group determination records for batch front-end process vents. 
Except as provided in paragraphs (a)(7) through (a)(9) of this section, 
each owner or operator of an affected source shall maintain the records 
specified in paragraphs (a)(1) through (a)(6) of this section for each 
batch front-end process vent subject to the group determination 
procedures of Sec. 63.488. Except for paragraph (a)(1) of this section, 
the records required to be maintained by this paragraph are limited to 
the information developed and used to make the group determination 
under Sec. 63.488(b) through Sec. 63.488(g), as appropriate. The 
information required by paragraph (a)(1) of this section is required 
for all batch front-end process vents subject to the group 
determination procedures of Sec. 63.488. If an owner or operator did 
not need to develop certain information (e.g., annual average flow 
rate) to determine the group status, this paragraph does not require 
that additional information be developed.
    (1) An identification of each unique product that has emissions 
from one or more batch emission episodes venting from the batch front-
end process vent.
    (2) A description of, and an emission estimate for, each batch 
emission episode, and the total emissions associated with one batch 
cycle for each unique product identified in paragraph (a)(1) of this 
section that was considered in making the group determination under 
Sec. 63.488.
    (3) Total annual uncontrolled TOC or organic HAP emissions, 
determined at the exit from the batch unit operation before any 
emission control, as determined in accordance with Sec. 63.488(b).
    (i) For Group 2 batch front-end process vents, emissions shall be 
determined at the batch cycle limitation.
    (ii) For Group 1 batch front-end process vents, emissions shall be 
those used to determine the group status of the batch front-end process 
vent.
    (4) The annual average flow rate for the batch front-end process 
vent as determined in accordance with Sec. 63.488(e).
    (5) The cutoff flow rate, determined in accordance with 
Sec. 63.488(f).
    (6) The results of the batch front-end process vent group 
determination, conducted in accordance with Sec. 63.488(g).
    (7) If a batch front-end process vent is in compliance with 
Sec. 63.487(a) or Sec. 63.487(b), and the control device is operating 
at all times when batch emission episodes are venting from the batch 
front-end process vent, none of the records in paragraphs (a)(1) 
through (a)(6) of this section are required.
    (8) If a batch front-end process vent is in compliance with 
Sec. 63.487(a) or Sec. 63.487(b), but the control device is operated 
only during selected batch emission episodes, only the records in 
paragraphs (a)(1) through (a)(3) of this section are required.
    (9) If the total annual emissions from the batch front-end process 
vent are less than the appropriate level specified in Sec. 63.488(d), 
only the records in paragraphs (a)(1) through (a)(3) of this section 
are required.
    (b) Compliance demonstration records. Each owner or operator of a 
batch front-end process vent or aggregate batch vent stream complying 
with Sec. 63.487(a) or (b), shall keep the following records, as 
applicable, up-to-date and readily accessible:
    (1) The annual mass emissions of halogen atoms in the batch front-
end process vent or aggregate batch vent stream determined according to 
the procedures specified in Sec. 63.488(h)(2).
    (2) If a batch front-end process vent is in compliance with 
Sec. 63.487(a)(2), records documenting the batch cycle percent 
reduction as specified in Sec. 62.486-4(c)(2).
    (3) When using a flare to comply with Sec. 63.487(a)(1):
    (i) The flare design (i.e., steam-assisted, air-assisted, or non-
assisted);
    (ii) All visible emission readings, heat content determinations, 
flow rate measurements, and exit velocity determinations made during 
the compliance determination required by Sec. 63.11(b) of subpart A; 
and
    (iii) All periods during the compliance determination required by 
Sec. 63.11(b) of subpart A when the pilot flame is absent.
    (4) The following information when using a control device to 
achieve compliance with Sec. 63.487(a)(2) or (b)(2):
    (i) For an incinerator or non-combustion control device, the 
percent reduction of organic HAP or TOC achieved, as determined using 
the procedures specified in Sec. 63.490(c) for batch front-end process 
vents and Sec. 63.490(e) for aggregate batch vent streams;
    (ii) For a boiler or process heater, a description of the location 
at which the vent stream is introduced into the boiler or process 
heater;
    (iii) For a boiler or process heater with a design heat input 
capacity of less than 44 megawatts and where the process vent stream is 
introduced with combustion air or is used as a secondary fuel and is 
not mixed with the primary fuel, the percent reduction of organic HAP 
or TOC achieved, as determined

[[Page 46948]]

using the procedures specified in Sec. 63.490(c) for batch front-end 
process vents and Sec. 63.490(e) for aggregate batch vent streams; and
    (iv) For a scrubber or other control device following a combustion 
device to control a halogenated batch front-end process vent or 
halogenated aggregate batch vent stream, the percent reduction of total 
hydrogen halides and halogens, as determined under Sec. 63.490(d)(3) or 
the emission limit determined under Sec. 63.490(d)(4).
    (c) Establishment of parameter monitoring level records. For each 
parameter monitored according to Sec. 63.489(b) and Table 6 of this 
subpart, or for alternate parameters and/or parameters for alternate 
control devices monitored according to Sec. 63.492(e) as allowed under 
Sec. 63.489(c), maintain documentation showing the establishment of the 
level that indicates proper operation of the control device as required 
by Sec. 63.489(e) for parameters specified in Sec. 63.489(b) and as 
required by Sec. 63.506(f) for alternate parameters. This documentation 
shall include the parameter monitoring data used to establish the 
level.
    (d) Group 2 batch front-end process vent continuous compliance 
records. The owner or operator of a Group 2 batch front-end process 
vent shall comply with either paragraph (d)(1) or (d)(2) of this 
section, as appropriate.
    (1) The owner or operator of a Group 2 batch front-end process vent 
complying with Sec. 63.487(g) shall keep the following records up-to-
date and readily accessible:
    (i) Records designating the established batch cycle limitation 
required by Sec. 63.487(g)(1) and specified in Sec. 63.490(f).
    (ii) Records specifying the number and type of batch cycles 
accomplished.
    (2) The owner or operator of a Group 2 batch front-end process vent 
complying with Sec. 63.487(f) shall keep the following records up-to-
date and readily accessible:
    (i) Records designating the established batch cycle limitation 
required by Sec. 63.487(f)(1) and specified in Sec. 63.490(f).
    (ii) Records specifying the number and type of batch cycles 
accomplished for each three month period.
    (e) Controlled batch front-end process vent continuous compliance 
records. Each owner or operator of a batch front-end process vent that 
uses a control device to comply with Sec. 63.487(a) shall keep the 
following records up-to-date and readily accessible:
    (1) Continuous records of the equipment operating parameters 
specified to be monitored under Sec. 63.489(b) as applicable, and 
listed in Table 6 of this subpart, or specified by the Administrator in 
accordance with Sec. 63.492(e) as allowed under Sec. 63.489(c). These 
records shall be kept as specified under Sec. 63.506(d), except as 
specified in paragraphs (e)(1)(i) and (e)(1)(ii) of this section.
    (i) For flares, the records specified in Table 6 of this subpart 
shall be kept rather than averages.
    (ii) For carbon adsorbers, the records specified in Table 6 of this 
subpart shall be kept rather than averages.
    (2) Records of the batch cycle daily average value of each 
continuously monitored parameter, except as provided in paragraphs 
(e)(2)(iii) of this section, as calculated using the procedures 
specified in paragraphs (e)(2)(i) through (e)(2)(ii) of this section.
    (i) The batch cycle daily average shall be calculated as the 
average of all parameter values measured during those batch emission 
episodes, or portions thereof, in the batch cycle that the owner or 
operator has selected to control.
    (ii) Monitoring data recorded during periods of monitoring system 
breakdowns, repairs, calibration checks, and zero (low-level) and high-
level adjustments shall not be included in computing the batch cycle 
daily averages.
    (iii) If all recorded values for a monitored parameter during an 
operating day are above the minimum or below the maximum level 
established in accordance with Sec. 63.489(e), the owner or operator 
may record that all values were above the minimum or below the maximum 
level established, rather than calculating and recording a batch cycle 
daily average for that operating day.
    (3) Hourly records of whether the flow indicator for bypass lines 
specified under Sec. 63.489(d)(1) was operating and whether flow was 
detected at any time during the hour. Also, records of the times and 
durations of all periods when the vent is diverted from the control 
device, or the flow indicator specified in Sec. 63.489(d)(1) is not 
operating.
    (4) Where a seal or closure mechanism is used to comply with 
Sec. 63.489(d)(2) or where computer monitoring of the position of the 
bypass damper or valve is used to comply with Sec. 63.489(d)(3), hourly 
records of flow are not required.
    (i) For compliance with Sec. 63.489(d)(2), the owner or operator 
shall record whether the monthly visual inspection of the seals or 
closure mechanism has been done, and shall record the occurrence of all 
periods when the seal mechanism is broken, the bypass line valve 
position has changed, or the key for a lock-and-key type configuration 
has been checked out, and records of any car-seal that has been broken.
    (ii) For compliance with Sec. 63.489(d)(3), the owner or operator 
shall record the times of all periods when the bypass line valve 
position has changed.
    (5) Records specifying the times and duration of periods of 
monitoring system breakdowns, repairs, calibration checks, and zero 
(low-level) and high level adjustments. In addition, records specifying 
any other periods of process or control device operation when monitors 
are not operating.
    (f) Aggregate batch vent stream continuous compliance records. In 
addition to the records specified in paragraphs (b) and (c) of this 
section, each owner or operator of an aggregate batch vent stream using 
a control device to comply with Sec. 63.487(b) shall keep records in 
accordance with the requirements for continuous process vents in 
Sec. 63.118(a) and Sec. 63.118(b) of subpart G, as applicable and 
appropriate, except that when complying with Sec. 63.118(b), owners or 
operators shall disregard statements concerning TRE index values for 
the purposes of this subpart.


Sec. 63.492   Batch front-end process vents--reporting requirements.

    (a) The owner or operator of a batch front-end process vent at an 
affected source shall submit the information specified in paragraphs 
(a)(1) through (a)(4) of this section, as appropriate, as part of the 
Notification of Compliance Status specified in Sec. 63.506(e)(5).
    (1) For each batch front-end process vent complying with 
Sec. 63.487(a) and each aggregate batch vent stream complying with 
Sec. 63.487(b), the information specified in Sec. 63.491(b) and 
Sec. 63.491(c), as applicable.
    (2) For each Group 2 batch front-end process vent with annual 
emissions less than the level specified in Sec. 63.488(d), the 
information specified in Sec. 63.491(d)(1)(i).
    (3) For each Group 2 batch front-end process vent with annual 
emissions greater than or equal to the level specified in 
Sec. 63.488(d), the information specified in Sec. 63.491(d)(2)(i).
    (4) For each batch process vent subject to the group determination 
procedures, the information specified in Sec. 63.491(a), as 
appropriate.
    (b) Whenever a process change, as defined in Sec. 63.488(i)(1), is 
made that causes a Group 2 batch front-end process vent to become a 
Group 1 batch front-end process vent, the owner or operator shall 
submit a report within 180 operating days after the process

[[Page 46949]]

change is made or the information regarding the process change is known 
to the owner or operator. This report may be included in the next 
Periodic Report, as specified in Sec. 63.506(e)(6)(iii)(D)(2). The 
following information shall be submitted:
    (1) A description of the process change; and
    (2) A schedule for compliance with the provisions of Sec. 63.487(a) 
or Sec. 63.487(b), as appropriate, as required under 
Sec. 63.506(e)(6)(iii)(D)(2).
    (c) Whenever a process change, as defined in Sec. 63.488(i)(1), is 
made that causes a Group 2 batch front-end process vent with annual 
emissions less than the level specified in Sec. 63.488(d) that is in 
compliance with Sec. 63.487(g) to have annual emissions greater than or 
equal to the levels specified in Sec. 63.488(d) but remains a Group 2 
batch front-end process vent, the owner or operator shall submit a 
report within 180 operating days after the process change is made or 
the information regarding the process change is known to the owner or 
operator. This report may be included in the next Periodic Report, as 
specified in Sec. 63.506(e)(6)(iii)(D)(2). The following information 
shall be submitted:
    (1) A description of the process change;
    (2) The results of the redetermination of the annual emissions, 
average flow rate, and cutoff flow rate required under Sec. 63.488(f) 
and recorded under Sec. 63.491 (a)(3) through (a)(5); and
    (3) The batch cycle limitation determined in accordance with 
Sec. 63.487(f)(1).
    (d) The owner or operator is not required to submit a report of a 
process change if one of the conditions specified in paragraphs (d)(1) 
and (d)(2) of this section is met.
    (1) The process change does not meet the description of a process 
change in Sec. 63.488(i).
    (2) The redetermined group status remains Group 2 for an individual 
batch front-end process vent with annual emissions greater than or 
equal to the level specified in Sec. 63.488(d), or a Group 2 batch 
front-end process vent with annual emissions less than the level 
specified in Sec. 63.488(d) complying with Sec. 63.487(g) continues to 
have emissions less than the level specified in Sec. 63.488(d).
    (e) If an owner or operator uses a control device other than those 
specified in Sec. 63.489(b) and listed in Table 6 of this subpart or 
requests approval to monitor a parameter other than those specified in 
Sec. 63.489(c) and listed in Table 6 of this subpart, the owner or 
operator shall submit a description of planned reporting and 
recordkeeping procedures, as specified in Sec. 63.506(f), as part of 
the Precompliance Report as required under Sec. 63.506(e)(3). The 
Administrator will specify appropriate reporting and recordkeeping 
requirements as part of the review of the Precompliance Report.
    (f) Owners or operators complying with Sec. 63.489(d), shall comply 
with paragraph (f)(1) or (f)(2) of this section, as appropriate.
    (1) Reports of the times of all periods recorded under 
Sec. 63.491(e)(3) when the batch front-end process vent is diverted 
away from the control device through a bypass line.
    (2) Reports of all occurrences recorded under Sec. 63.491(e)(4) in 
which the seal mechanism is broken, the bypass line valve position has 
changed, or the key to unlock the bypass line valve was checked out.


Sec. 63.493   Back-end process provisions.

    Owners and operators of new and existing affected sources shall 
comply with the requirements in Sec. 63.494 through Sec. 63.500. Owners 
and operators of affected sources that produce only latex products, 
liquid rubber products, or products in a gas-phased polymerization 
reaction are not subject to the provisions of these sections. Section 
63.494 contains residual organic HAP limitations. Compliance with these 
residual organic HAP limitations may be achieved by using either 
stripping technology, or by using control or recovery devices. If 
compliance with these limitations is achieved using stripping 
technology, the procedures to determine compliance are specified in 
Sec. 63.495. If compliance with these limitations is achieved using 
control or recovery devices, the procedures to determine compliance are 
specified in Sec. 63.496, and associated monitoring requirements are 
specified in Sec. 63.497. Recordkeeping requirements are contained in 
Sec. 63.498, and reporting requirements in Sec. 63.499. Section 63.500 
contains a limitation on carbon disulfide emissions from affected 
sources that produce styrene butadiene rubber using an emulsion 
process. Table 8 contains a summary of compliance alternative 
requirements for these sections.


Sec. 63.494   Back-end process provisions--residual organic HAP 
limitations.

    (a) The monthly weighted average residual organic HAP content of 
all grades of elastomer processed, measured immediately after the 
stripping operation [or the reactor(s) if the plant has no stripper(s)] 
is completed, shall not exceed the limits provided in paragraphs (a)(1) 
through (a)(4) of this section, as applicable. Owners or operators 
shall comply with the requirements of this paragraph using either 
stripping technology or control/recovery devices.
    (1) For styrene butadiene rubber produced by the emulsion process:
    (i) A monthly weighted average of 0.40 kg styrene per megagram (Mg) 
latex for existing sources; and
    (ii) A monthly weighted average of 0.23 kg styrene per Mg latex for 
new sources;
    (2) For polybutadiene rubber and styrene butadiene rubber produced 
by the solution process:
    (i) A monthly weighted average of 10 kg total organic HAP per Mg 
crumb rubber (dry weight) for existing sources; and
    (ii) A monthly weighted average of 6 kg total organic HAP per Mg 
crumb rubber (dry weight) for new sources.
    (3) For ethylene-propylene rubber produced by the solution process:
    (i) A monthly weighted average of 8 kg total organic HAP per Mg 
crumb rubber (dry weight) for existing sources; and
    (ii) A monthly weighted average of 5 kg total organic HAP per Mg 
crumb rubber (dry weight) for new sources.
    (4) There are no back-end process operation residual organic HAP 
limitations for neoprene, Hypalon TM, nitrile butadiene rubber, 
butyl rubber, halobutyl rubber, epichlorohydrin elastomer, and 
polysulfide rubber.
    (5) For EPPU that produce both an elastomer product with a residual 
organic HAP limitation listed in this section, and a product listed in 
paragraphs (a)(5) (i) through (iv) of this section, only the residual 
HAP content of the elastomer product with a residual organic HAP 
limitation shall be used in determining the monthly average residual 
organic HAP content.
    (i) Resins;
    (ii) Liquid rubber products;
    (iii) Latexes from which crumb rubber is not coagulated; or
    (iii) Elastomer products listed in paragraph (a)(4) of this 
section.
    (b) If an owner or operator complies with the residual organic HAP 
limitations in paragraph (a) of this section using stripping 
technology, compliance shall be demonstrated in accordance with 
Sec. 63.495. The owner or operator shall also comply with the 
recordkeeping provisions in Sec. 63.498, and the reporting provisions 
in Sec. 63.499.
    (c) If an owner or operator complies with the residual organic HAP 
limitations in paragraph (a) of this section using control or recovery 
devices, compliance shall be

[[Page 46950]]

demonstrated using the procedures in Sec. 63.496. The owner or operator 
shall also comply with the monitoring provisions in Sec. 63.497, the 
recordkeeping provisions in Sec. 63.498, and the reporting provisions 
in Sec. 63.499.


Sec. 63.495  Back-end process provisions--procedures to determine 
compliance using stripping technology.

    (a) If an owner or operator complies with the residual organic HAP 
limitations in Sec. 63.494(a) using stripping technology, compliance 
shall be demonstrated using the periodic sampling procedures in 
paragraph (b) of this section, or using the stripper parameter 
monitoring procedures in paragraph (c) of this section. The owner or 
operator shall determine the monthly weighted average residual organic 
HAP content for each month in which any portion of the back-end of an 
elastomer production process is in operation. A single monthly weighted 
average shall be determined for all back-end process operations at the 
affected source.
    (b) If the owner or operator is demonstrating compliance using 
periodic sampling, this demonstration shall be in accordance with 
paragraphs (b)(1) through (b)(5) of this section,
    (1) The location of the sampling shall be in accordance with 
paragraph (d) of this section.
    (2) The frequency of the sampling shall be in accordance with 
paragraphs (b)(2)(i) or (b)(2)(ii) of this section.
    (i) If batch stripping is used, at least one representative sample 
is to be taken from every batch of elastomer produced, at the location 
specified in paragraph (d) of this section, and identified by elastomer 
type and by the date and time the batch is completed.
    (ii) If continuous stripping is used, at least one representative 
sample is to be taken each operating day. The sample is to be taken at 
the location specified in paragraph (d) of this section, and identified 
by elastomer type and by the date and time the sample was taken.
    (3) The residual organic HAP content in each sample is to be 
determined using specified methods.
    (4) The quantity of material (weight of latex or dry crumb rubber) 
represented by each sample shall be recorded. Acceptable methods of 
determining this quantity are production records, measurement of stream 
characteristics, and engineering calculations.
    (5) The monthly weighted average shall be determined using the 
equation in paragraph (f) of this section. All samples taken and 
analyzed during the month shall be used in the determination of the 
monthly weighted average.
    (c) If the owner or operator is demonstrating compliance using 
stripper parameter monitoring, this demonstration shall be in 
accordance with paragraphs (c)(1) through (c)(4) of this section.
    (1) The owner or operator shall establish stripper operating 
parameter levels for each grade in accordance with Sec. 63.505(e).
    (2) The owner or operator shall monitor the stripper operating 
parameters at all times the stripper is in operation. Readings of each 
parameter shall be made at intervals no greater than 15 minutes.
    (3) The residual organic HAP content for each grade shall be 
determined in accordance with either paragraph (c)(3)(i) or (c)(3)(ii) 
of this section.
    (i) If during the processing of a grade in the stripper, all hourly 
average parameter values are in accordance with operating parameter 
levels established in paragraph (c)(1) of this section, the owner or 
operator shall use the residual organic HAP content determined in 
accordance with Sec. 63.505(e)(1).
    (ii) If during the processing of a grade in the stripper, the 
hourly average of any stripper monitoring parameter is not in 
accordance with an established operating parameter level, the residual 
organic HAP content shall be determined using the procedures in 
paragraphs (b)(1) and (b)(3) of this section.
    (4) The monthly weighted average shall be determined using the 
equation in paragraph (f) of this section.
    (d) The location of the sampling shall be in accordance with 
paragraph (d)(1) or (d)(2) of this section.
    (1) For styrene butadiene rubber produced by the emulsion process, 
the sample shall be a sample of the latex taken at the location 
specified in either paragraph (d)(1)(i), (d)(1)(ii), or (d)(1)(iii) of 
this section.
    (i) When the latex is not blended with other materials or latexes, 
the sample shall be taken at a location meeting all of the following 
criteria:
    (A) After the stripping operation,
    (B) Prior to entering the coagulation operations, and
    (C) Before the addition of carbon black or oil extenders.
    (ii) When two or more latexes subject to this subpart are blended, 
samples may be taken in accordance with either paragraph (d)(1)(ii) (A) 
or (B) of this section, at a location meeting the requirements of 
paragraphs (d)(1)(i) (A) through (C) of this section.
    (A) Individual samples may be taken of each latex prior to 
blending, or
    (B) A sample of the blended latex may be taken.
    (iii) When a latex subject to this subpart is blended with a latex 
or material not subject to this subpart, a sample shall be taken of the 
latex prior to blending at a location meeting the requirements of 
paragraphs (d)(1)(i) (A) through (C) of this section.
    (2) For styrene butadiene rubber produced by the solution process, 
polybutadiene rubber produced by the solution process, and ethylene-
propylene rubber produced by the solution process, the sample shall be 
a sample of crumb rubber taken as soon as safe and feasible after the 
stripping operation, but no later than the entry point for the first 
unit operation following the stripper (e.g., the dewatering screen).
    (e) Reserved.
    (f) The monthly weighted average residual organic HAP content shall 
be calculated using Equation 26.
[GRAPHIC] [TIFF OMITTED] TR05SE96.025

where:
HAPCONTavg,wk = Monthly weighted average organic HAP content for 
all rubber processed at the affected source, kg organic HAP per Mg 
latex or dry crumb rubber.
n = Number of samples in the month.
Ci = Residual organic HAP content of sample i, determined in 
accordance with (b)(3) or (c)(3) of this section, kg organic HAP per Mg 
latex or dry crumb rubber.
Pi = Weight of latex or dry crumb rubber represented by sample i.
Pwk = Weight of latex or dry crumb rubber (Mg) processed in the 
month.


Sec. 63.496  Back-end process provisions--procedures to determine 
compliance using control or recovery devices.

    (a) If an owner or operator complies with the residual organic HAP 
limitations in Sec. 63.494(a) using control or recovery devices, 
compliance shall be demonstrated using the procedures in paragraphs (b) 
and (c) of this section. Previous test results conducted in accordance 
with paragraphs (b)(1) through (b)(6) of this section may be used to 
determine compliance in accordance with paragraph (c) of this section.
    (b) Compliance shall be demonstrated using the provisions in 
paragraphs (b)(1) through (b)(10) of this section, as applicable.
    (1) A test shall be conducted, the duration of which shall be in 
accordance with either paragraph

[[Page 46951]]

(b)(1)(i) or (b)(1)(ii) of this section, as appropriate.
    (i) If the back-end process operations are continuous, the test 
shall consist of three separate one hour runs.
    (ii) If the back-end process operations are batch, the test shall 
consist of three separate one-hour runs, unless the duration of the 
batch cycle is less than one-hour, in which case the run length shall 
equal the complete duration of the back-end process batch cycle.
    (2) The test shall be conducted when the grade of elastomer product 
with the highest residual organic HAP content leaving the stripper is 
processed in the back-end operations.
    (3) The uncontrolled residual organic HAP content in the latex or 
dry crumb rubber shall be determined in accordance with 
Sec. 63.495(b)(1) and (b)(3). A separate sample shall be taken and 
analyzed for each test run. The sample shall be representative of the 
material being processed in the back-end operation during the test, and 
does not need to be taken during the test.
    (4) The quantity of material (weight of latex or dry crumb rubber) 
processed during the test run shall be recorded. Acceptable methods of 
determining this quantity are production records, measurement of stream 
characteristics, and engineering calculations.
    (5) The inlet and outlet emissions from the control or recovery 
device shall be determined using the procedures in paragraphs (b)(5)(i) 
through (b)(5)(v) of this section, with the exceptions noted in 
paragraphs (b)(6) and (b)(7) of this section. The inlet and outlet 
emissions shall be determined when the material for which the 
uncontrolled residual organic HAP content is determined in accordance 
with paragraph (b)(3) of this section, is being processed in the 
equipment controlled by the control or recovery device.
    (i) Method 1 or 1A of 40 CFR part 60, appendix A, as appropriate, 
shall be used for selection of the sampling sites. Sampling sites shall 
be located at the inlet of the control or recovery device as specified 
in paragraphs (b)(5)(i)(A) or (b)(5)(i)(B) of this section, and at the 
outlet of the control or recovery device.
    (A) The inlet sampling site shall be located at the exit of the 
back-end process unit operation before any opportunity for emission to 
the atmosphere, and before any control or recovery device.
    (B) If back-end process vent streams are combined prior to being 
routed to control or recovery devices, the inlet sampling site may be 
for the combined stream, as long as there is no opportunity for 
emission to the atmosphere from any of the streams prior to being 
combined.
    (ii) The gas volumetric flow rate shall be determined using Method 
2, 2A, 2C, or 2D of 40 CFR part 60, appendix A, as appropriate.
    (iii) To determine the inlet and outlet total organic HAP 
concentrations, the owner or operator shall use Method 18 or Method 25A 
of 40 CFR part 60, appendix A. Alternatively, any other method or data 
that has been validated according to the applicable procedures in 
Method 301 of appendix A may be used. The minimum sampling time for 
each run shall be in accordance with paragraph (b)(1) of this section, 
during which either an integrated sample or grab samples shall be 
taken. If grab sampling is used, then the samples shall be taken at 
approximately equal intervals during the run, with the time between 
samples no greater than 15 minutes.
    (iv) The mass rate of total organic HAP shall be computed using 
Equations 27 and 28.
[GRAPHIC] [TIFF OMITTED] TR05SE96.026

where:
Cij, Coj=Concentration of sample component j of the gas 
stream at the inlet and outlet of the control or recovery device, 
respectively, dry basis, ppmv.
Ei, Eo=Mass rate of total organic HAP at the inlet and outlet 
of the control or recovery device, respectively, dry basis, kg per hour 
(kg/hr).
Mij, Moj=Molecular weight of sample component j of the gas 
stream at the inlet and outlet of the control or recovery device, 
respectively, gm/gm-mole.
Qi, Qo=Flow rate of gas stream at the inlet and outlet of the 
control or recovery device, respectively, dry standard m\3\/min.
K2=Constant, 2.494  x  10-6 (ppmv)-1 (gm-mole/scm) (kg/
gm) (min/hr), where standard temperature is 20 deg.C.
    (v) Inlet and outlet organic HAP emissions for the run shall be 
calculated by multiplying the mass rate total inlet and outlet 
emissions determined in accordance with paragraph (b)(5)(iv) of this 
section by the duration of the run (in hours).
    (6) If a back-end process vent stream is introduced with the 
combustion air, or as a secondary fuel into a boiler or process heater 
with a design capacity less than 44 megawatts, the inlet and outlet 
emissions shall be determined in accordance with paragraphs (b)(6)(i) 
through (b)(6)(iv) of this section.
    (i) The inlet organic HAP emissions for the back-end process unit 
operation shall be determined in accordance with paragraph (b)(5) of 
this section.
    (ii) The owner or operator shall also measure total organic HAP (or 
TOC, minus methane and ethane) emissions in all process vent streams 
and primary and secondary fuels introduced into the boiler or process 
heater, using the procedures in paragraph (b)(5) of this section, with 
the exceptions noted in paragraphs (b)(6)(ii)(A) through (b)(6)(ii)(C) 
of this section.
    (A) Selection of the location of the inlet sampling sites shall 
ensure the measurement of total organic HAP concentrations in all 
process vent streams and primary and secondary fuels introduced into 
the boiler or process heater.
    (B) Paragraph (b)(5)(iii) of this section is applicable, except 
that TOC (minus methane and ethane) may be measured instead of total 
organic HAP.
    (C) The mass rates shall be calculated in accordance with paragraph 
(b)(5)(iv) of this section, except that Cj at the inlet and outlet 
of the control device shall be the sum of all total organic HAP (or 
TOC, minus methane and ethane) concentrations for all process vent 
streams and primary and secondary fuels introduced into the boiler or 
process heater.
    (iii) The control efficiency of the boiler or process heater shall 
be calculated using Equation 29.
[GRAPHIC] [TIFF OMITTED] TR05SE96.027


[[Page 46952]]


where:

R=Control efficiency of boiler or process heater, percent.
Einlet=Mass rate of total organic HAP or TOC (minus methane and 
ethane) for all process vent streams and primary and secondary fuels at 
the inlet to the boiler or process heater, kg organic HAP/hr or kg TOC/
hr.
Eoutlet=Mass rate of total organic HAP or TOC (minus methane and 
ethane) for all process vent streams and primary and secondary fuels at 
the outlet to the boiler or process heater, kg organic HAP/hr or kg 
TOC/hr.

    (iv) The outlet total organic HAP emissions associated with the 
back-end process unit operation shall be calculated using the equation 
in paragraph (b)(8) of this section.
    (7) An owner or operator is not required to conduct a source test 
to determine the outlet organic HAP emissions if any control device 
specified in paragraphs (b)(7)(i) through (b)(7)(v) of this section is 
used. For these devices, the inlet emissions associated with the back-
end process unit operation shall be determined in accordance with 
paragraph (b)(5) of this section, and the outlet emissions shall be 
calculated using the equation in paragraph (b)(8) of this section.
    (i) A flare, provided the owner or operator complies with the flare 
provisions in Sec. 63.11(b) of subpart A. The compliance determination 
required by Sec. 63.6(h) of subpart A shall be conducted using Method 
22 of 40 CFR part 60, appendix A, to determine visible emissions. 
Compliance determinations are not necessary for flares already deemed 
to be in compliance with the flare provisions in Sec. 63.11(b) of 
subpart A.
    (ii) A boiler or process heater with a design heat input capacity 
of 44 megawatts or greater.
    (iii) A boiler or process heater into which the process vent stream 
is introduced with the primary fuel or is used as the primary fuel.
    (iv) A control device for which a performance test was conducted 
for determining compliance with an NSPS and the test was conducted 
using the same procedures specified in this section and no process 
changes have been made since the test.
    (v) A boiler or process heater burning hazardous waste for which 
the owner or operator:
    (A) Has been issued a final permit under 40 CFR part 270 and 
complies with the requirements of 40 CFR part 266, subpart H, or
    (B) Has certified compliance with the interim status requirements 
of 40 CFR part 266, subpart H.
    (8) If one of the control devices listed in paragraph (b)(6) or 
(b)(7) of this section is used, the outlet emissions shall be 
calculated using Equation 30.
[GRAPHIC] [TIFF OMITTED] TR05SE96.028

where:

Eo=Mass rate of total organic HAP at the outlet of the control or 
recovery device, respectively, dry basis, kg/hr.
Ei=Mass rate of total organic HAP at the inlet of the control or 
recovery device, respectively, dry basis, kg/hr, determined using the 
procedures in paragraph (b)(5)(iv) of this section.
R=Control efficiency of control device, as specified in paragraph 
(b)(8) (i), (ii), or (iii) of this section.

    (i) If a back-end process vent stream is introduced with the 
combustion air, or as a secondary fuel into a boiler or process heater 
with a design capacity less than 44 megawatts, the control efficiency 
of the boiler or process heater shall be determined using the 
procedures in paragraph (b)(6)(iii) of this section.
    (ii) If a back-end process vent is controlled using a control 
device specified in paragraph (b)(7) (i), (ii), (iii), or (v) of this 
section, the control device efficiency shall be assumed to be 98 
percent.
    (iii) If a back-end process vent is controlled using a control 
device specified in paragraph (b)(7)(iv) of this section, the control 
device efficiency shall be the efficiency determined in the previous 
performance test.
    (c) Compliance shall be determined using the procedures in this 
paragraph.
    (1) For each test run, the residual organic HAP content, adjusted 
for the control or recovery device emission reduction, shall be 
calculated using Equation 31.
Where:

[GRAPHIC] [TIFF OMITTED] TR05SE96.029

HAPCONTrun=Factor, kg organic HAP per kg elastomer (latex or dry 
crumb rubber).
C=Total uncontrolled organic HAP content, determined in accordance with 
paragraph (b)(3) of this section, kg organic HAP per kg latex or dry 
crumb rubber.
P=Weight of latex or dry crumb rubber processed during test run.
Ei,run=Mass rate of total organic HAP at the inlet of the control 
or recovery device, respectively, dry basis, kg per test run.
Eo,run=Mass rate of total organic HAP at the outlet of the control 
or recovery device, respectively, dry basis, kg per test run.

    (2) A facility is in compliance if the average of the organic HAP 
contents calculated for all three test runs is below the residual 
organic HAP limitations in Sec. 63.494(a).
    (d) An owner or operator complying with the residual organic HAP 
limitations in Sec. 63.494(a) using a control or recovery device, shall 
redetermine the compliance status through the requirements described in 
paragraph (b) of this section whenever process changes are made. The 
owner or operator shall report the results of the redetermination in 
accordance with Sec. 63.499(d). For the purposes of this section, a 
process change is any action that would reasonably be expected to 
impair the performance of the control or recovery device. For the 
purposes of this section, the production of an elastomer with a 
residual organic HAP content greater than the residual organic HAP 
content of the elastomer used in the compliance demonstration 
constitutes a process change, unless the overall effect of the change 
is to reduce organic HAP emissions from the source as a whole. Other 
examples of process changes may include changes in production capacity 
or production rate, or removal or addition of equipment. For the 
purposes of this paragraph, process changes do not include: Process 
upsets; unintentional, temporary process changes; or changes that 
reduce the residual organic HAP content of the elastomer.


Sec. 63.497  Back-end process provisions--monitoring provisions for 
control and recovery devices.

    (a) An owner or operator complying with the residual organic HAP 
limitations in Sec. 63.494(a) using control

[[Page 46953]]

or recovery devices, or a combination of stripper technology and 
control or recovery devices, shall install the monitoring equipment 
specified in paragraphs (a)(1) through (a)(6) of this section, as 
appropriate.
    (1) Where an incinerator is used, a temperature monitoring device 
equipped with a continuous recorder is required.
    (i) Where an incinerator other than a catalytic incinerator is 
used, the temperature monitoring device shall be installed in the 
firebox or in the ductwork immediately downstream of the firebox in a 
position before any substantial heat exchange occurs.
    (ii) Where a catalytic incinerator is used, the temperature 
monitoring devices shall be installed in the gas stream immediately 
before and after the catalyst bed.
    (2) Where a flare is used, a device (including, but not limited to, 
a thermocouple, ultra-violet beam sensor, or infrared sensor) capable 
of continuously detecting the presence of a pilot flame is required.
    (3) Where a boiler or process heater of less than 44 megawatts 
design heat input capacity is used, a temperature monitoring device in 
the firebox equipped with a continuous recorder is required. Any boiler 
or process heater in which all vent streams are introduced with primary 
fuel or are used as the primary fuel is exempt from this requirement.
    (4) For an absorber, a scrubbing liquid temperature monitoring 
device and a specific gravity monitoring device are required, each 
equipped with a continuous recorder.
    (5) For a condenser, a condenser exit (product side) temperature 
monitoring device equipped with a continuous recorder is required.
    (6) For a carbon adsorber, an integrating regeneration stream flow 
monitoring device having an accuracy of at least plus-minus10 
percent, capable of recording the total regeneration stream flow for 
each regeneration cycle; and a carbon bed temperature monitoring 
device, capable of recording the carbon bed temperature after each 
regeneration and within 15 minutes of completing any cooling cycle are 
required.
    (b) An owner or operator may request approval to monitor parameters 
other than those required by paragraph (a) of this section. The request 
shall be submitted according to the procedures specified in 
Sec. 63.506(f) or (g). Approval shall be requested if the owner or 
operator:
    (1) Uses a control or recovery device other than those listed in 
paragraph (a) of this section; or
    (2) Uses one of the control or recovery devices listed in paragraph 
(a) of this section, but seeks to monitor a parameter other than those 
specified in paragraph (a) of this section.
    (c) The owner or operator shall establish a level, defined as 
either a maximum or minimum operating parameter, that indicates proper 
operation of the control or recovery device for each parameter 
monitored under paragraphs (a)(1) through (a)(6) of this section. This 
level is determined in accordance with Sec. 63.505. The established 
level, along with supporting documentation, shall be submitted in the 
Notification of Compliance Status or the operating permit application, 
as required in Sec. 63.506 (e)(5) or (e)(8), respectively. The owner or 
operator shall operate control and recovery devices above or below the 
established level, as required, to ensure continued compliance with the 
standard.
    (d) The owner or operator of a controlled back-end process vent 
using a vent system that contains bypass lines that could divert a vent 
stream away from the control or recovery device used to comply with 
Sec. 63.494(a) shall comply with paragraph (d)(1), (d)(2), or (d)(3) of 
this section. Equipment such as low leg drains, high point bleeds, 
analyzer vents, open-ended valves or lines, and pressure relief valves 
needed for safety purposes are not subject to this paragraph.
    (1) Properly install, maintain, and operate a flow indicator that 
takes a reading at least once every 15 minutes. Records shall be 
generated as specified in Sec. 63.498(d)(5)(iii). The flow indicator 
shall be installed at the entrance to any bypass line that could divert 
the vent stream away from the control device to the atmosphere; or
    (2) Secure the bypass line valve in the non-diverting position with 
a car-seal or a lock-and-key type configuration. A visual inspection of 
the seal or closure mechanism shall be performed at least once every 
month to ensure that the valve is maintained in the non-diverting 
position and the vent stream is not diverted through the bypass line.
    (3) Continuously monitor the bypass line damper or valve position 
using computer monitoring and record any periods when the position of 
the bypass line valve has changes as specified in 
Sec. 63.498(d)(5)(iv).


Sec. 63.498  Back-end process provisions--recordkeeping.

    (a) Each owner or operator shall maintain the records specified in 
paragraphs (a)(1) through (a)(3) of this section for each back-end 
process operation at an affected source.
    (1) The type of elastomer product processed in the back-end 
operation.
    (2) The type of process (solution process, emulsion process, etc.)
    (3) If the back-end process operation is subject to an emission 
limitation in Sec. 63.494(a), whether compliance will be achieved by 
stripping technology, or by control or recovery devices.
    (b) Each owner or operator of a back-end process operation using 
stripping technology to comply with an emission limitation in 
Sec. 63.494(a), and demonstrating compliance using the periodic 
sampling procedures in Sec. 63.495(b), shall maintain the records 
specified in paragraph (b)(1), and in paragraph (b)(2) or (b)(3) of 
this section, as appropriate.
    (1) Records associated with each sample taken in accordance with 
Sec. 63.495(b). These records shall include the following for each 
sample:
    (i) Elastomer type,
    (ii) The date and time the sample was collected,
    (iii) The corresponding quantity of elastomer processed over the 
time period represented by the sample. Acceptable methods of 
determining this quantity are production records, measurement of stream 
characteristics, and engineering calculations.
    (A) For emulsion processes, this quantity shall be the weight of 
the latex leaving the stripper.
    (B) For solution processes, this quantity shall be the crumb rubber 
dry weight of the rubber leaving the stripper.
    (iv) The organic HAP content of each sample.
    (2) The monthly weighted average organic HAP content, calculated in 
accordance with Sec. 63.495(f).
    (3) If the organic HAP contents for all samples analyzed during a 
month are below the appropriate level in Sec. 63.494(a), the owner or 
operator may record that all samples were in accordance with the 
residual organic HAP limitations in Sec. 63.494(a), rather than 
calculating and recording a monthly weighted average.
    (c) Each owner or operator of a back-end process operation using 
stripping technology to comply with an emission limitation in 
Sec. 63.494(a), and demonstrating compliance using the stripper 
parameter monitoring procedures in Sec. 63.495(c), shall maintain the 
records specified in paragraphs (c)(1) through (c)(3) of this section.
    (1) Records associated with the initial, and subsequent, 
determinations of the organic HAP content of each grade of elastomer 
produced. These records shall include the following:

[[Page 46954]]

    (i) An identification of the elastomer type and grade;
    (ii) The results of the residual organic HAP analyses, conducted in 
accordance with Sec. 63.505(e)(1);
    (iii) The stripper monitoring parameters required to be established 
in Sec. 63.495(c)(1).
    (iv) If re-determinations are made of the organic HAP content, and 
re-establishment of the stripper monitoring parameters, records of the 
initial determination are no longer required to be maintained.
    (2) Records associated with each grade or batch. These records 
shall include the following for each grade or batch:
    (i) Elastomer type and grade;
    (ii) The quantity of elastomer processed;
    (A) For emulsion processes, this quantity shall be the weight of 
the latex leaving the stripper.
    (B) For solution processes, this quantity shall be the crumb rubber 
dry weight of the crumb rubber leaving the stripper.
    (iii) The hourly average of all stripper parameter results;
    (iv) If one or more hourly average stripper monitoring parameters 
is not in accordance with the established levels, the results of the 
residual organic HAP analysis.
    (3) The monthly weighted average organic HAP content, calculated in 
accordance with Sec. 63.495(f).
    (d) Each owner or operator of a back-end process operation using 
control or recovery devices to comply with an organic HAP emission 
limitation in Sec. 63.494(a) shall maintain the records specified in 
paragraphs (d)(1) through (d)(5) of this section.
    (1) Results of the testing required by Sec. 63.496(b). These 
results shall include the following, for each of the three required 
test runs:
    (i) The uncontrolled residual organic HAP content in the latex or 
dry crumb rubber, as required to be determined by Sec. 63.496(b)(3), 
including the test results of the analysis;
    (ii) The total quantity of material (weight of latex or dry crumb 
rubber) processed during the test run, recorded in accordance with 
Sec. 63.496(b)(4),
    (iii) The organic HAP emissions at the inlet and outlet of the 
control or recovery device, determined in accordance with Sec. 63.496 
(b)(5) through (b)(8), including all test results and calculations,
    (iv) The residual organic HAP content, adjusted for the control or 
recovery device emission reduction, determined in accordance with 
Sec. 63.496(c)(1).
    (2) The operating parameter level established in accordance with 
Sec. 63.497(c), along with supporting documentation.
    (3) The following information when using a flare:
    (i) The flare design (i.e., steam-assisted, air-assisted, or non-
assisted);
    (ii) All visible emission readings, heat content determinations, 
flow rate measurements, and exit velocity determinations made during 
the compliance determination; and
    (iii) All periods during the compliance determination when the 
pilot flame is absent.
    (4) When using a boiler or process heater, a description of the 
location at which the vent stream is introduced into the boiler or 
process heater.
    (5) Each owner or operator using a control or recovery device shall 
keep the following records up-to-date and readily accessible:
    (i) Continuous records of the equipment operating parameters 
specified to be monitored under Sec. 63.497(a) or specified by the 
Administrator in accordance with Sec. 63.497(b). For flares, the hourly 
records and records of pilot flame outages shall be maintained in place 
of continuous records.
    (ii) Records of the daily average value of each continuously 
monitored parameter for each operating day, except as provided in 
paragraphs (d)(5)(ii)(D) and (d)(5)(ii)(E) of this section.
    (A) The daily average shall be calculated as the average of all 
values for a monitored parameter recorded during the operating day, 
except as provided in paragraph (d)(5)(ii)(B) of this section. The 
average shall cover a 24-hour period if operation is continuous, or the 
number of hours of operation per operating day if operation is not 
continuous.
    (B) Monitoring data recorded during periods of monitoring system 
breakdowns, repairs, calibration checks, and zero (low-level) and high-
level adjustments shall not be included in computing the hourly or 
daily averages. Records shall be kept of the times and durations of all 
such periods and any other periods of process or control device 
operation when monitors are not operating.
    (C) The operating day shall be the period defined in the operating 
permit or the Notification of Compliance Status in Sec. 63.506(e)(8) or 
(e)(5). It may be from midnight to midnight or another 24-hour period.
    (D) If all recorded values for a monitored parameter during an 
operating day are below the maximum, or above the minimum, level 
established in the Notification of Compliance Status in 
Sec. 63.506(e)(5) or in the operating permit, the owner or operator may 
record that all values were below the maximum or above the minimum 
level, rather than calculating and recording a daily average for that 
operating day.
    (E) For flares, records of the times and duration of all periods 
during which the pilot flame is absent shall be kept rather than daily 
averages. The records specified in this paragraph are not required 
during periods when emissions are not routed to the flare, or during 
startups, shutdowns, or malfunctions when the owner or operator 
complies with the applicable requirements of subpart A of this part, as 
directed by Sec. 63.506(b)(1).
    (iii) Hourly records of whether the flow indicator specified under 
Sec. 63.497(d)(1) was operating and whether a diversion was detected at 
any time during the hour, as well as records of the times of all 
periods when the vent stream is diverted from the control device or the 
flow indicator is not operating.
    (iv) Where a seal mechanism is used to comply with 
Sec. 63.497(d)(2), or where computer monitoring of the position of the 
bypass damper or valve is used to comply with Sec. 63.497(d)(3), hourly 
records of flow are not required.
    (A) For compliance with Sec. 63.497(d)(2), the owner or operator 
shall record whether the monthly visual inspection of the seals or 
closure mechanisms has been done, and shall record instances when the 
seal mechanism is broken, the bypass line valve position has changed, 
or the key for a lock-and-key type configuration has been checked out, 
and records of any car-seal that has broken.
    (B) For compliance with Sec. 63.497(d)(3), the owner or operator 
shall record the times of all periods when the bypass line damper or 
valve position has changed.


Sec. 63.499   Back-end process provisions--reporting.

    (a) The owner or operator of an affected source with back-end 
process operations shall submit the information required in 
Sec. 63.498(a) as part of the Notification of Compliance Status 
specified in Sec. 63.506(e)(5).
    (b) Each owner or operator of a back-end process operation using 
stripping to comply with an emission limitation in Sec. 63.494(a), and 
demonstrating compliance by stripper parameter monitoring, shall submit 
reports as specified in paragraphs (b)(1) and (b)(2) of this section.
    (1) As part of the Notification of Compliance Status specified in

[[Page 46955]]

Sec. 63.506(e)(5), the owner or operator shall submit the information 
specified in Sec. 63.498(c)(1).
    (2) For organic HAP content/stripping monitoring parameter re-
determinations, and the addition of new grades, the information 
specified in Sec. 63.498(c)(1) shall be submitted in the next periodic 
report specified in Sec. 63.506(e)(6).
    (c) Each owner or operator of a back-end process operation control 
or recovery devices that must comply with an emission limitation in 
Sec. 63.494(a) shall submit the information specified in paragraphs 
(c)(1) through (c)(3) of this section as part of the Notification of 
Compliance Status specified in Sec. 63.506(e)(5).
    (1) The residual organic HAP content, adjusted for the control or 
recovery device emission reduction, determined in accordance with 
Sec. 63.496(c)(1), for each test run in the compliance determination.
    (2) The operating parameter level established in accordance with 
Sec. 63.497(c), along with supporting documentation.
    (3) The information specified in Sec. 63.498(d)(3) regarding flares 
and Sec. 63.498(d)(4) regarding boilers and process heaters, if 
applicable.
    (d) Whenever a process change, as defined in Sec. 63.496(d), is 
made that causes the redetermination of the compliance status for the 
back-end process operations, the owner or operator shall submit a 
report within 180 calendar days after the process change as specified 
in Sec. 63.506(e)(7)(iii). The report shall include:
    (1) A description of the process change;
    (2) The results of the redetermination of the compliance status, 
determined in accordance with Sec. 63.496(b), and recorded in 
accordance with Sec. 63.498(d)(1), and
    (3) Documentation of the re-establishment of a parameter level for 
the control or recovery device, defined as either a maximum or minimum 
operating parameter, that indicates proper operation of the control or 
recovery device, in accordance with Sec. 63.497(c) and recorded in 
accordance with Sec. 63.498(d)(2).
    (e) If an owner or operator uses a control or recovery device other 
than those listed in Sec. 63.497(a) or requests approval to monitor a 
parameter other than those specified in Sec. 63.497(a), the owner or 
operator shall submit a description of planned reporting and 
recordkeeping procedures as required under Sec. 63.506(e)(3) or (e)(8). 
The Administrator will specify appropriate reporting and recordkeeping 
requirements as part of the review of the Precompliance Report or 
Operating Permit application.


Sec. 63.500   Back-end process provisions--carbon disulfide limitations 
for styrene butadiene rubber by emulsion processes.

    (a) Owners or operators of sources subject to this subpart 
producing styrene butadiene rubber using an emulsion process shall 
operate the process such that the carbon disulfide concentration in 
each crumb dryer exhausts shall not exceed 45 ppmv.
    (1) The owner or operator shall develop standard operating 
procedures for the addition of sulfur containing shortstop agents to 
ensure that the limitation in paragraph (a) of this section is 
maintained. There shall be a standard operating procedure representing 
the production of every grade of styrene butadiene rubber produced at 
the affected source using a sulfur containing shortstop agent.
    (2) A validation of each standard operating procedure shall be 
conducted in accordance with paragraph (c) of this section, except as 
provided in paragraph (b) of this section, to demonstrate compliance 
with the limitation in paragraph (a) of this section.
    (3) The owner or operator shall operate the process in accordance 
with a validated standard operating procedure at all times when styrene 
butadiene rubber is being produced using a sulfur containing shortstop 
agent. If a standard operating procedure is changed, it must be re-
validated.
    (4) Records specified in paragraph (d) of this section shall be 
maintained.
    (5) Reports shall be submitted in accordance with paragraph (e) of 
this section.
    (b) Crumb dryers that are vented to a combustion device are not 
subject to the provisions in this section.
    (c) The owner or operator shall validate each standard operating 
procedure to determine compliance with the limitation in paragraph (a) 
of this section using the testing procedures in paragraph (c)(1) of 
this section or engineering assessment, as described in paragraph 
(c)(2) of this section.
    (1) The owner or operator shall conduct a performance test using 
the procedures in paragraphs (c)(1)(i) through (c)(1)(iii) of this 
section to demonstrate compliance with the carbon disulfide 
concentration limitation in paragraph (a) of this section. One test 
shall be conducted for each standard operating procedure.
    (i) Method 1 or 1A of 40 CFR part 60, appendix A, as required, 
shall be used for selection of the sampling sites.
    (ii) The gas volumetric flow rate shall be determined using Method 
2, 2A, 2C, or 2D of 40 CFR part 60, appendix A, as required.
    (iii) To determine compliance with the carbon disulfide 
concentration limit in paragraph (a) of this section, the owner or 
operator shall use Method 18 or Method 25A of 40 CFR part 60, appendix 
A, to measure carbon disulfide. Alternatively, any other method or data 
that has been validated according to the applicable procedures in 
Method 301 of appendix A of this part may be used. The following 
procedures shall be used to calculate carbon disulfide concentration:
    (A) The minimum sampling time for each run shall be 1 hour, in 
which either an integrated sample or a minimum of four grab samples 
shall be taken. If grab sampling is used, then the samples shall be 
taken at approximately equal intervals in time, such as 15 minute 
intervals during the run.
    (B) The concentration of carbon disulfide shall be calculated using 
Equation 32.
[GRAPHIC] [TIFF OMITTED] TR05SE96.030

where:

CCS2=Concentration of carbon disulfide, dry basis, ppmv.
CCS2i=Concentration of carbon disulfide of sample i, dry basis, 
ppmv.
n=Number of samples in the sample run.

    (2) The owner or operator shall use engineering assessment to 
demonstrate compliance with the carbon disulfide concentration 
limitation in paragraph (a) of this section. Engineering assessment 
includes, but is not limited to, the following:
    (i) Previous test results, provided the tests are representative of 
current operating practices at the process unit.
    (ii) Bench-scale or pilot-scale test data representative of the 
process under representative operating conditions.
    (iii) Flow rate and/or carbon disulfide emission rate specified or 
implied within an applicable permit limit.
    (iv) Design analysis based on accepted chemical engineering 
principles, measurable process parameters, or physical or chemical laws 
or properties. Examples of analytical methods include, but are not 
limited to:
    (A) Use of material balances,
    (B) Estimation of flow rate based on physical equipment design such 
as pump or blower capacities, and
    (C) Estimation of carbon disulfide concentrations based on 
saturation conditions.

[[Page 46956]]

    (v) All data, assumptions, and procedures used in the engineering 
assessment shall be documented.
    (d) Owners and operators of sources subject to this section shall 
maintain the records specified in paragraphs (d)(1) and (d)(2) of this 
section.
    (1) Documentation of the results of the testing required by 
paragraph (c) of this section.
    (2) A description of the standard operating procedure used during 
the testing. This description shall include, at a minimum, an 
identification of the sulfur containing shortstop added to the styrene 
butadiene rubber prior to the dryers, an identification of the point 
and time in the process where the sulfur containing shortstop is added, 
and an identification of the amount of sulfur containing shortstop 
added per unit of latex.
    (e) Owners and operators shall submit the reports as specified in 
paragraphs (e)(1) and (e)(2) of this section.
    (1) As part of the Notification of Compliance Status specified in 
Sec. 63.506(e)(5), documentation of the results of the testing required 
by paragraph (c) of this section.
    (2) If changes are made in the standard operating procedure used 
during the compliance test and recorded in accordance with paragraph 
(d)(2) of this section, and if those changes have the potential for 
increasing the concentration of carbon disulfide in the crumb dryer 
exhaust to above the 45 ppmv limit, the owner or operator shall:
    (i) Redetermine compliance using the test procedures in paragraph 
(c) of this section, and
    (ii) Submit documentation of the testing results in the next 
periodic report required by Sec. 63.506(e)(6).


Sec. 63.501  Wastewater provisions.

    (a) For each process wastewater stream originating at an affected 
source, except those wastewater streams exempted by paragraph (c) of 
this section, the owner or operator shall comply with the requirements 
of Secs. 63.131 through 63.148 of subpart G, with the differences noted 
in paragraphs (a)(1) through (a)(11) of this section, for the purposes 
of this subpart.
    (1) When the determination of equivalence criteria in 
Sec. 63.102(b) of subpart F is referred to in Secs. 63.132, 63.133, and 
63.137 of subpart G, the provisions in Sec. 63.6(g) of subpart A shall 
apply for the purposes of this subpart.
    (2) When the storage tank requirements contained in Secs. 63.119 
through 63.123 of subpart G are referred to in Secs. 63.132 through 
63.148 of subpart G, Secs. 63.119 through 63.123 of subpart G are 
applicable, with the exception of the differences referred to in 
Sec. 63.484, for the purposes of this subpart.
    (3) When the Implementation Plan requirements contained in 
Sec. 63.151 in subpart G are referred to in Sec. 63.146 of subpart G, 
the owner or operator of an affected source subject to this subpart 
need not comply.
    (4) When the Initial Notification Plan requirements in 
Sec. 63.151(b) of subpart G are referred to in Sec. 63.146 of subpart 
G, the owner or operator of an affected source subject to this subpart 
need not comply.
    (5) When the owner or operator requests to use alternatives to the 
continuous operating parameter monitoring and recordkeeping provisions 
referred to in Sec. 63.151(g) of subpart G, or the owner or operator 
submits an operating permit application instead of an Implementation 
Plan as specified in Sec. 63.152(e) of subpart G, as referred to in 
Sec. 63.146(a)(3) of subpart G, Sec. 63.506(f) and Sec. 63.506(e)(8), 
respectively, shall apply for the purposes of this subpart.
    (6) When the Notification of Compliance Status requirements 
contained in Sec. 63.152(b) of subpart G are referred to in 
Secs. 63.146 and 63.147 of subpart G, the Notification of Compliance 
Status requirements contained in Sec. 63.506(e)(5) shall apply for the 
purposes of this subpart.
    (7) When the Periodic Report requirements contained in 
Sec. 63.152(c) of subpart G are referred to in Secs. 63.146 and 63.147 
of subpart G, the Periodic Report requirements contained in 
Sec. 63.506(e)(6) shall apply for the purposes of this subpart.
    (8) When the term ``range'' is used in Sec. 63.143(f) of subpart G, 
the term ``level'' shall be used instead, for the purposes of this 
subpart. This level shall be determined using the procedures specified 
in Sec. 63.505.
    (9) For the purposes of this subpart, owners or operators are not 
required to comply with the provisions of Sec. 63.138(e)(2) of subpart 
G which specify that owners or operators shall demonstrate that 95 
percent of the mass of HAP, as listed in Table 9 of subpart G, is 
removed from the wastewater stream or combination of wastewater streams 
by the procedure specified in Sec. 63.145(i) of subpart G for a 
biological treatment unit.
    (10) For the purposes of this subpart, owners or operators are not 
required to comply with the provisions of Sec. 63.138(j)(3) of subpart 
G which specify that owners or operators shall use the procedures 
specified in Appendix C of subpart G to demonstrate compliance when 
using a biological treatment unit.
    (11) When the provisions of Sec. 63.139(c)(1)(ii) of subpart G or 
the provisions of Sec. 63.145(e)(2)(ii)(B) specify that Method 18 shall 
be used, Method 18 or Method 25A may be used for the purposes of this 
subpart. The use of Method 25A shall comply with paragraphs (a)(11)(i) 
and (a)(11)(ii) of this section.
    (i) The organic HAP used as the calibration gas for Method 25A 
shall be the single organic HAP representing the largest percent by 
volume of the emissions.
    (ii) The use of Method 25A is acceptable if the response from the 
high-level calibration gas is at least 20 times the standard deviation 
of the response from the zero calibration gas when the instrument is 
zeroed on the most sensitive scale.
    (b) Except for those streams exempted by paragraph (c) of this 
section, the owner or operator of each affected source shall comply 
with the requirements for maintenance wastewater in Sec. 63.105 of 
subpart F, except that when Sec. 63.105(a) refers to ``organic HAPs,'' 
the definition of organic HAP in Sec. 63.482 shall apply for the 
purposes of this subpart.
    (c) The following wastewater streams are exempt from the 
requirements of paragraphs (a) and (b) of this section:
    (1) Back-end wastewater streams originating from equipment that 
only produces latex products.
    (2) Back-end wastewater streams at affected sources that are 
subject to a residual organic HAP limitation in Sec. 63.494(a), and 
that are complying with these limitations through the use of stripping 
technology.
    (d) The compliance date for the affected source subject to the 
provisions of this section is specified in Sec. 63.481.


Sec. 63.502  Equipment leak provisions.

    (a) The owner or operator of each affected source, shall comply 
with the requirements of subpart H of this part for all equipment in 
organic HAP service, with the exception noted in paragraphs (b) through 
(h) of this section.
    (b) Surge control vessels and bottoms receivers described in 
paragraphs (b)(1) through (b)(6) of this section are exempt from the 
requirements contained in Sec. 63.170 of subpart H.
    (1) Surge control vessels and bottoms receivers containing styrene-
butadiene latex;
    (2) Surge control vessels and bottoms receivers containing other 
latex products and located downstream of the stripping operations;

[[Page 46957]]

    (3) Surge control vessels and bottoms receivers containing high 
conversion latex products;
    (4) Surge control vessels and bottoms receivers located downstream 
of the stripping operations at affected sources subject to the back-end 
residual organic HAP limitation located in Sec. 63.494, that are 
complying through the use of stripping technology, as specified in 
Sec. 63.495;
    (5) Surge control vessels and bottoms receivers containing styrene;
    (6) Surge control vessels and bottoms receivers containing 
acrylamide; and
    (7) Surge control vessels and bottoms receivers containing 
epichlorohydrin.
    (c) The compliance date for the equipment leak provisions in this 
section is provided in Sec. 63.481.
    (d) For an affected source producing polybutadiene rubber and 
styrene butadiene rubber by solution, the indications of liquids 
dripping, as defined in subpart H of this part, from bleed ports in 
pumps and agitator seals in light liquid service, shall not be 
considered a leak. For the purposes of this subpart, a ``bleed port'' 
is a technologically-required feature of the pump or seal whereby 
polymer fluid used to provide lubrication and/or cooling of the pump or 
agitator shaft exits the pump, thereby resulting in a visible dripping 
of fluid.
    (e) Affected sources subject to subpart I of this part shall 
continue to comply with subpart I until the compliance date specified 
in Sec. 63.481. After the compliance date for this section, the source 
shall be subject to subpart H of this part and shall no longer be 
subject to subpart I.
    (f) The owner or operator of each affected source shall comply with 
the requirements of Sec. 63.104 of subpart F for heat exchange systems.
    (g) Owners and operators of an affected source subject to this 
subpart are not required to submit the Initial Notification required by 
Sec. 63.182(a)(1) and Sec. 63.182(b) of subpart H.
    (h) The Notification of Compliance Status required by 
Sec. 63.182(a)(2) and Sec. 63.182(c) of subpart H shall be submitted 
within 150 days (rather than 90 days) of the applicable compliance date 
specified in Sec. 63.481 for the equipment leak provisions. The 
notification can be submitted as part of the Notification of Compliance 
Status required by Sec. 63.506(e)(5).
    (i) The Periodic Reports required by Sec. 63.182(a)(3) and 
Sec. 63.182(d) of subpart H shall be submitted as part of the Periodic 
Reports required by Sec. 63.506(e)(6).


Sec. 63.503  Emissions averaging provisions.

    (a) This section applies to owners or operators of existing 
affected sources who seek to comply with Sec. 63.483(b) by using 
emissions averaging rather than following the provisions of 
Secs. 63.484, 63.485, 63.486, 63.494, and 64.488.
    (1) The following emission point limitations apply to the use of 
these provisions:
    (i) All emission points included in an emissions average shall be 
from the same affected source. There may be an emissions average for 
each individual affected source located at a plant site.
    (ii)(A) If a plant site has only one affected source for which 
emissions averaging is being used to demonstrate compliance, the number 
of emission points allowed to be included in the emission average is 
limited to twenty. This number may be increased by up to five 
additional points if pollution prevention measures are used to control 
five or more of the emission points included in the emissions average.
    (B) If a plant site has two or more affected sources for which 
emissions averaging is being used to demonstrate compliance, the number 
of emission points allowed in the emissions average for those affected 
sources is limited to twenty. This number may be increased by up to 
five additional emission points if pollution prevention measures are 
used to control five or more of the emission points included in the 
emissions averages.
    (2) Compliance with the provisions of this section can be based on 
either organic HAP or TOC.
    (3) For the purposes of these provisions, whenever Method 18 is 
specified within the paragraphs of this section or is specified by 
reference through provisions outside this section, Method 18 or Method 
25A may be used. The use of Method 25A shall comply with paragraphs 
(a)(3)(i) and (a)(3)(ii) of this section.
    (i) The organic HAP used as the calibration gas for Method 25A 
shall be the single organic HAP representing the largest percent by 
volume of the emissions.
    (ii) The use of Method 25A is acceptable if the response from the 
high-level calibration gas is at least 20 times the standard deviation 
of the response from the zero calibration gas when the instrument is 
zeroed on the most sensitive scale.
    (b) Unless an operating permit application has been submitted, the 
owner or operator shall develop and submit for approval an Emissions 
Averaging Plan containing all of the information required in 
Sec. 63.506(e)(4) for all emission points to be included in an 
emissions average.
    (c) Paragraphs (c)(1) through (c)(4) of this section describe the 
emission points that can be used to generate emissions averaging 
credits if control was applied after November 15, 1990 and if 
sufficient information is available to determine the appropriate value 
of credits for the emission point. Paragraph (c)(5) of this section 
discusses the use of pollution prevention in generating emissions 
averaging credits.
    (1) Storage vessels, batch front-end process vents, aggregate batch 
vent streams, continuous front-end process vents, and process 
wastewater streams that are determined to be Group 2 emission points.
    (2) Storage vessels, continuous front-end process vents, and 
process wastewater steams that are determined to be Group 1 emission 
points and that are controlled by a technology that the Administrator 
or permitting authority agrees has a higher nominal efficiency than the 
reference control technology. Information on the nominal efficiencies 
for such technologies must be submitted and approved as provided in 
paragraph (i) of this section.
    (3) Batch front-end process vents and aggregate batch vent streams 
that are determined to be Group 1 emission points and that are 
controlled to a level more stringent than the applicable standard.
    (4) Back-end process operations that are controlled such that 
organic HAP emissions from the back-end process operation are less than 
would be achieved by meeting the residual organic HAP limits in 
Sec. 63.494. For the purposes of the emission averaging provisions in 
this section, all back-end process operations at an affected facility 
shall be considered a single emission point.
    (5) The percent reduction for any storage vessel, batch front-end 
process vent, aggregate batch vent stream, continuous front-end process 
vent, and process wastewater stream shall be determined using the 
procedures specified in paragraph (j) of this section.
    (i) For a Group 1 storage vessel, batch front-end process vent, 
aggregate batch vent stream, continuous front-end process vent, or 
process wastewater stream, the pollution prevention measure must reduce 
emissions more than if the reference control technology or standard had 
been applied to the emission point instead of the pollution prevention 
measure, except as provided in paragraph (c)(5)(ii) of this section.
    (ii) If a pollution prevention measure is used in conjunction with 
other controls for a Group 1 storage vessel,

[[Page 46958]]

batch front-end process vent, aggregate batch vent stream, continuous 
front-end process vent, or process wastewater stream, the pollution 
prevention measure alone does not have to reduce emissions more than 
the reference control technology or standard, but the combination of 
the pollution prevention measure and other controls must reduce 
emissions more than if the applicable reference control technology or 
standard had been applied instead of the pollution prevention measure.
    (d) The following emission points cannot be used to generate 
emissions averaging credits:
    (1) Emission points already controlled on or before November 15, 
1990 cannot be used to generate credits unless the level of control was 
increased after November 15, 1990. In this case, credit will be allowed 
only for the increase in control after November 15, 1990.
    (2) Group 1 emission points, identified in paragraph (c)(2) of this 
section, that are controlled by a reference control technology cannot 
be used to generate credits unless the reference control technology has 
been approved for use in a different manner and a higher nominal 
efficiency has been assigned according to the procedures in paragraph 
(i) of this section.
    (3) Emission points on nonoperating EPPU cannot be used to generate 
credits. EPPU that are shutdown cannot be used to generate credits or 
debits.
    (4) Maintenance wastewater cannot be used to generate credits. 
Wastewater streams treated in biological treatment units cannot be used 
to generate credits. These two types of wastewater cannot be used to 
generate credits or debits. For the purposes of this section, the terms 
wastewater and wastewater stream are used to mean process wastewater.
    (5) Emission points controlled to comply with a State or Federal 
rule other than this subpart cannot be used to generate credits, unless 
the level of control has been increased after November 15, 1990 to a 
level above what is required by the other State or Federal rule. Only 
the control above what is required by the other State or Federal rule 
will be credited. However, if an emission point has been used to 
generate emissions averaging credit in an approved emissions average, 
and the emission point is subsequently made subject to a State or 
Federal rule other than this subpart, the emission point can continue 
to generate emissions averaging credit for the purpose of complying 
with the previously approved emissions average.
    (e) For all emission points included in an emissions average, the 
owner or operator shall perform the following tasks:
    (1) Calculate and record monthly debits for all Group 1 emission 
points that are controlled to a level less stringent than the reference 
control technology or standard for those emission points. The Group 1 
emission points are identified in paragraphs (c)(2) through (c)(4) of 
this section. Equations in paragraph (g) of this section shall be used 
to calculate debits.
    (2) Calculate and record monthly credits for all Group 1 and Group 
2 emission points that are overcontrolled to compensate for the debits. 
Equations in paragraph (h) of this section shall be used to calculate 
credits. Emission points and controls that meet the criteria of 
paragraph (c) of this section may be included in the credit 
calculation, whereas those described in paragraph (d) of this section 
shall not be included.
    (3) Demonstrate that annual credits calculated according to 
paragraph (h) of this section are greater than or equal to debits 
calculated for the same annual compliance period according to paragraph 
(g) of this section.
    (i) The owner or operator may choose to include more than the 
required number of credit-generating emission points in an emissions 
average in order to increase the likelihood of being in compliance.
    (ii) The initial demonstration in the Emissions Averaging Plan or 
operating permit application that credit-generating emission points 
will be capable of generating sufficient credits to offset the debits 
from the debit-generating emission points must be made under 
representative operating conditions. After the compliance date, actual 
operating data will be used for all debit and credit calculations.
    (4) Demonstrate that debits calculated for a quarterly (3-month) 
period according to paragraph (g) of this section are not more than 
1.30 times the credits for the same period calculated according to 
paragraph (h) of this section. Compliance for the quarter shall be 
determined based on the ratio of credits and debits from that quarter, 
with 30 percent more debits than credits allowed on a quarterly basis.
    (5) Record and report quarterly and annual credits and debits in 
the Periodic Reports as specified in Sec. 63.506(e)(6). Every fourth 
Periodic Report shall include a certification of compliance with the 
emissions averaging provisions as required by 
Sec. 63.506(e)(6)(vi)(D)(2).
    (f) Debits and credits shall be calculated in accordance with the 
methods and procedures specified in paragraphs (g) and (h) of this 
section, respectively, and shall not include emissions during the 
following periods:
    (1) Emissions during periods of startup, shutdown, and malfunction 
as described in the Startup, Shutdown, and Malfunction Plan.
    (2) Emissions during periods of monitoring excursions, as defined 
in Sec. 63.505 (g) or (h). For these periods, the calculation of 
monthly credits and debits shall be adjusted as specified in paragraphs 
(f)(2)(i) through (f)(2)(iii) of this section.
    (i) No credits would be assigned to the credit-generating emission 
point.
    (ii) Maximum debits would be assigned to the debit-generating 
emission point.
    (iii) The owner or operator may demonstrate to the Administrator 
that full or partial credits or debits should be assigned using the 
procedures in paragraph (l) of this section.
    (g) Debits are generated by the difference between the actual 
emissions from a Group 1 emission point that is uncontrolled or is 
controlled to a level less stringent than the applicable reference 
control technology or standard and the emissions allowed for the Group 
1 emission point. Debits shall be calculated as follows:
    (1) Source-wide debits shall be calculated using Equation 33. 
Debits and all terms of the equation are in units of megagrams per 
month (Mg/month).

[[Page 46959]]

[GRAPHIC] [TIFF OMITTED] TR05SE96.031


where:
ECFEPViACTUAL=Emissions from each Group 1 continuous front-end 
process vent i that is uncontrolled or is controlled to a level less 
stringent than the applicable reference control technology. 
ECFEPViACTUAL is calculated according to paragraph (g)(2)(iii) of 
this section.
(0.02)ECFEPViu=Emissions from each Group 1 continuous front-end 
process vent i if the applicable reference control technology had been 
applied to the uncontrolled emissions. ECFEPViu is calculated 
according to paragraph (g)(2)(ii) of this section.
ESiACTUAL=Emissions from each Group 1 storage vessel i that is 
uncontrolled or is controlled to a level less stringent than the 
applicable reference control technology or standard. ESiACTUAL is 
calculated according to paragraph (g)(3) of this section.
(0.05)ESiu=Emissions from each Group 1 storage vessel i if the 
applicable reference control technology or standard had been applied to 
the uncontrolled emissions. ESiu is calculated according to 
paragraph (g)(3) of this section.
EBEPACTUAL=Emissions from back-end process operations that do not 
meet the residual organic HAP limits in Sec. 63.494. EBEPACTUAL is 
calculated according to paragraph (g)(4)(i) of this section.
EBEPc=Emissions from back-end process operations if the residual 
organic HAP limits in Sec. 63.494(a) were met. EBEPc is calculated 
according to paragraph (g)(4)(ii) of this section.
EWWiACTUAL=Emissions from each Group 1 wastewater stream i that is 
uncontrolled or is controlled to a level less stringent than the 
applicable reference control technology. EWW2iACTUAL is calculated 
according to paragraph (g)(5) of this section.
EWWic=Emissions from each Group 1 wastewater stream i if the 
reference control technology had been applied to the uncontrolled 
emissions. EWWic is calculated according to paragraph (g)(5) of 
this section.
EBFEPViACTUAL=Emissions from each Group 1 batch front-end process 
vent stream i that is uncontrolled or is controlled to a level less 
stringent than the reference control technology. EBFEPViACTUAL is 
calculated according to paragraph (g)(6)(ii) of this section.
(0.1)EBFEPViu=Emissions from each Group 1 batch front-end process 
vent i if the applicable reference control technology or standard had 
been applied to the uncontrolled emissions. EBFEPViu is calculated 
according to paragraph (g)(6)(i) of this section.
EABViACTUAL=Emissions from each Group 1 aggregate batch vent 
stream i that is uncontrolled or is controlled to a level less 
stringent than the applicable reference control technology. 
EABViACTUAL is calculated according to paragraph (g)(7)(iii) of 
this section.
(0.1)EABViu=Emissions from each Group 1 aggregate batch vent 
stream i if the applicable reference control technology had been 
applied to the uncontrolled emissions. EABViu is calculated 
according to paragraph (g)(7)(ii) of this section.
n=The number of emission points being included in the emissions 
average.

    (2) Emissions from continuous front-end process vents shall be 
calculated as follows:
    (i) For purposes of determining continuous front-end process vent 
stream flow rate, organic HAP concentrations, and temperature, the 
sampling site shall be after the final product recovery device, if any 
recovery devices are present; before any control device (for continuous 
front-end process vents, recovery devices shall not be considered 
control devices); and before discharge to the atmosphere. Method 1 or 
1A of 40 CFR part 60, appendix A, shall be used for selection of the 
sampling site.
    (ii) ECFEPViu for each continuous front-end process vent i 
shall be calculated using Equation 34.
[GRAPHIC] [TIFF OMITTED] TR05SE96.032

where:
ECFEPViu=Uncontrolled continuous front-end process vent emission 
rate from continuous front-end process vent i, Mg/month.
Q=Vent stream flow rate, dry standard m3/min, measured using 
Method 2, 2A, 2C, or 2D of 40 CFR part 60, appendix A, as appropriate.
h=Monthly hours of operation during which positive flow is present in 
the continuous front-end process vent, hr/month.
Cj=Concentration, ppmv, dry basis, of organic HAP j as measured by 
Method 18 or Method 25A of 40 CFR part 60, appendix A.

[[Page 46960]]

Mj=Molecular weight of organic HAP j, gram per gram-mole.
n=Number of organic HAP in stream.

    (A) The values of Q and Cj shall be determined during a 
performance test conducted under representative operating conditions. 
The values of Q and Cj shall be established in the Notification of 
Compliance Status and must be updated as provided in paragraph 
(g)(2)(ii)(B) of this section.
    (B) If there is a change in capacity utilization other than a 
change in monthly operating hours, or if any other change is made to 
the process or product recovery equipment or operation such that the 
previously measured values of Q and Cj are no longer 
representative, a new performance test shall be conducted to determine 
new representative values of Q and Cj. These new values shall be 
used to calculate debits and credits from the time of the change 
forward, and the new values shall be reported in the next Periodic 
Report.
    (iii) The following procedures and equations shall be used to 
calculate ECFEPViACTUAL:
    (A) If the continuous front-end process vent is not controlled by a 
control device or pollution prevention measure, ECFEPViACTUAL = 
ECFEPViu, where ECFEPViu is calculated according to the 
procedures contained in paragraphs (g)(2)(i) and (g)(2)(ii) of this 
section.
    (B) If the continuous front-end process vent is controlled using a 
control device or a pollution prevention measure achieving less than 
98-percent reduction, ECFEPViACTUAL is calculated using Equation 
35.
[GRAPHIC] [TIFF OMITTED] TR05SE96.033

Where:

ECFEPViACTUAL = Emissions from each Group 1 continuous front-end 
process vent i that is uncontrolled or is controlled to a level less 
stringent than the reference control technology.
ECFEPViu = Uncontrolled continuous front-end process vent emission 
rate from continuous front-end process vent i, Mg/month.
    (1) The percent reduction shall be measured according to the 
procedures in Sec. 63.116 of subpart G if a combustion control device 
is used. For a flare meeting the criteria in Sec. 63.116(a) of subpart 
G, or a boiler or process heater meeting the criteria in Sec. 63.116(b) 
of subpart G, the percent reduction shall be 98 percent. If a 
noncombustion control device is used, percent reduction shall be 
demonstrated by a performance test at the inlet and outlet of the 
device, or, if testing is not feasible, by a control design evaluation 
and documented engineering calculations.
    (2) For determining debits from Group 1 continuous front-end 
process vents, product recovery devices shall not be considered control 
devices and cannot be assigned a percent reduction in calculating 
ECFEPViACTUAL. The sampling site for measurement of uncontrolled 
emissions is after the final product recovery device. However, as 
provided in Sec. 63.113(a)(3) of subpart G, a Group 1 continuous front-
end process vent may add sufficient product recovery to raise the TRE 
index value above 1.0, thereby becoming a Group 2 continuous front-end 
process vent. Such a continuous front-end process vent would not be a 
Group 1 continuous front-end process vent and would, therefore, not be 
included in determining debits under this paragraph.
    (3) Procedures for calculating the percent reduction of pollution 
prevention measures are specified in paragraph (j) of this section.
    (3) Emissions from storage vessels shall be calculated using the 
procedures specified in Sec. 63.150(g)(3) of subpart G.
    (4) Emissions from back-end process operations shall be calculated 
as follows:
    (i) Equation 36 shall be used to calculate EBEPACTUAL:
    [GRAPHIC] [TIFF OMITTED] TR05SE96.034
    
where:

EBEPACTUAL = Actual emissions from back-end process operations, 
Mg/month.
Ci = Residual organic HAP content of sample i, kg organic HAP per 
Mg latex or dry crumb rubber.
Pi = Weight of latex or dry crumb rubber leaving the stripper 
represented by sample i, Mg.
    (ii) Equation 37 shall be used to calculate EBEPc:
    [GRAPHIC] [TIFF OMITTED] TR05SE96.051
    
where:

EBEPc = Emissions from back-end process operations if the residual 
organic HAP limits in Sec. 63.494(a) were met, Mg/month.
HAPlimit = Residual organic HAP limits in Sec. 63.494 of this 
subpart, kg organic HAP per Mg latex or dry crumb rubber.
Pmonth=Weight of latex or dry crumb rubber leaving the stripper in 
the month, Mg.

    (5) Emissions from wastewater shall be calculated using the 
procedures specified in Sec. 63.150(g)(5) of subpart G.
    (6) Emissions from batch front-end process vents shall be 
calculated as follows:
    (i) EBFEPViu for each batch front-end process vent i shall be 
calculated using the procedures specified in Sec. 63.488(b).
    (ii) The following procedures and equations shall be used to 
determine EBFEPViACTUAL:
    (A) If the batch front-end process vent is not controlled by a 
control device or pollution prevention measure,

[[Page 46961]]

EBFEPViACTUAL=EBFEPViu, where EBFEPViu is calculated 
according to the procedures in Sec. 63.488(b).
    (B) If the batch front-end process vent is controlled using a 
control device or a pollution prevention measure achieving less than 90 
percent reduction for the batch cycle, calculate EBFEPViACTUAL 
using Equation 38, where percent reduction is for the batch cycle.
[GRAPHIC] [TIFF OMITTED] TR05SE96.035

    (1) The percent reduction for the batch cycle shall be measured 
according to the procedures in Sec. 63.490(c)(2).
    (2) The percent reduction for control devices shall be calculated 
according to the procedures in Sec. 63.490 (c)(2)(i) through 
(c)(2)(iii).
    (3) The percent reduction of pollution prevention measures shall be 
calculated using the procedures specified in paragraph (j) of this 
section.
    (7) Emissions from aggregate batch vents shall be calculated as 
follows:
    (i) For purposes of determining aggregate batch vent stream flow 
rate, organic HAP concentrations, and temperature, the sampling site 
shall be before any control device and before discharge to the 
atmosphere. Method 1 or 1A of 40 CFR part 60, appendix A, shall be used 
for selection of the sampling site.
    (ii) EABViu for each aggregate batch vent i shall be 
calculated using Equation 39.
[GRAPHIC] [TIFF OMITTED] TR05SE96.036

where:

EABViu=Uncontrolled aggregate batch vent emission rate from 
aggregate batch vent i, Mg/month.
Q=Vent stream flow rate, dry standard cubic meters per minute, measured 
using Method 2, 2A, 2C, or 2D of 40 CFR part 60, appendix A, as 
appropriate.
h=Monthly hours of operation during which positive flow is present from 
the aggregate batch vent stream, hr/month.
Cj=Concentration, ppmv, dry basis, of organic HAP j as measured by 
Method 18 of 40 CFR part 60, appendix A.
Mj=Molecular weight of organic HAP j, gram per gram-mole.
n=Number of organic HAP in the stream.

    (A) The values of Q and Cj shall be determined during a 
performance test conducted under representative operating conditions. 
The values of Q and Cj shall be established in the Notification of 
Compliance Status and must be updated as provided in paragraph 
(g)(7)(ii)(B) of this section.
    (B) If there is a change in capacity utilization other than a 
change in monthly operating hours, or if any other change is made to 
the process or product recovery equipment or operation such that the 
previously measured values of Q and Cj are no longer 
representative, a new performance test shall be conducted to determine 
new representative values of Q and Cj. These new values shall be 
used to calculate debits and credits from the time of the change 
forward, and the new values shall be reported in the next Periodic 
Report.
    (iii) The following procedures and equations shall be used to 
calculate EABViACTUAL:
    (A) If the aggregate batch vent is not controlled by a control 
device or pollution prevention measure, EABViACTUAL = EABViu, 
where EABViu is calculated according to the procedures in 
paragraphs (g)(7)(i) and (g)(7)(ii) of this section.
    (B) If the aggregate batch vent stream is controlled using a 
control device or a pollution prevention measure achieving less than 90 
percent reduction, calculate EABViACTUAL using Equation 40.
[GRAPHIC] [TIFF OMITTED] TR05SE96.037

    (1) The percent reduction for control devices shall be determined 
according to the procedures in Sec. 63.490(e).
    (2) The percent reduction of pollution prevention measures shall be 
calculated according to the procedures specified in paragraph (j) of 
this section.
    (h) Credits are generated by the difference between emissions that 
are allowed for each Group 1 and Group 2 emission point and the actual 
emissions from that Group 1 or Group 2 emission point that has been 
controlled after November 15, 1990 to a level more stringent than what 
is required by this subpart or any other State or Federal rule or 
statute. Credits shall be calculated as follows:
    (1) Source-wide credits shall be calculated using Equation 41. 
Credits and all terms of the equation are in units of Mg/month, and the 
baseline date is November 15, 1990.

[[Page 46962]]

[GRAPHIC] [TIFF OMITTED] TR05SE96.038


where:
D = Discount factor = 0.9 for all credit generating emission points, 
except those controlled by a pollution prevention measure; discount 
factor = 1.0 for each credit generating emission point controlled by a 
pollution prevention measure (i.e., no discount provided).
ECFEPV1iACTUAL = Emissions for each Group 1 continuous front-end 
process vent i that is controlled to a level more stringent than the 
reference control technology. ECFEPV1iACTUAL is calculated 
according to paragraph (h)(2)(ii) of this section.
(0.02)ECFEPV1iu = Emissions from each Group 1 continuous front-end 
process vent i if the reference control technology had been applied to 
the uncontrolled emissions. ECFEPV1iu is calculated according to 
paragraph (h)(2)(i) of this section.
ECFEPV2iACTUAL = Emissions from each Group 2 continuous front-end 
process vent i that is controlled. ECFEPV2iACTUAL is calculated 
according to paragraph (h)(2)(iii) of this section.
ECFEPV2iBASE = Emissions from each Group 2 continuous front-end 
process vent i at the baseline date. ECFEPV1iBASE is calculated in 
paragraph (h)(2)(iv) of this section.
ES1iACTUAL = Emissions from each Group 1 storage vessel i that is 
controlled to a level more stringent than the reference control 
technology or standard. ES1iACTUAL is calculated according to 
paragraph (h)(3) of this section.
(0.05) ES1iu = Emissions from each Group 1 storage vessel i if the 
reference control technology had been applied to the uncontrolled 
emissions. ES1iu is calculated according to paragraph (h)(3) of 
this section.
ES2iACTUAL = Emissions from each Group 2 storage vessel i that is 
controlled. ES2iACTUAL is calculated according to paragraph (h)(3) 
of this section.
ES2iBASE = Emissions from each Group 2 storage vessel i at the 
baseline date. ES2iBASE is calculated in paragraph (h)(3) of this 
section.
EBEPACTUAL = Actual emissions from back-end process operations, 
Mg/month. EBEPACTUAL is calculated in paragraph (h)(4)(i) of this 
section.
EBEPc = Emissions from back-end process operations if the residual 
organic HAP limits in Sec. 63.494(a) were met, Mg/month. EBEPc is 
calculated in paragraph (h)(4)(ii) of this section.
EWW1iACTUAL = Emissions from each Group 1 wastewater stream i that 
is controlled to a level more stringent than the reference control 
technology. EWW1iACTUAL is calculated according to paragraph 
(h)(5) of this section.
EWW1ic = Emissions from each Group 1 wastewater stream i if the 
reference control technology had been applied to the uncontrolled 
emissions. EWW1ic is calculated according to paragraph (h)(5) of 
this section.
EWW2iACTUAL = Emissions from each Group 2 wastewater stream i that 
is controlled. EWW2iACTUAL is calculated according to paragraph 
(h)(5) of this section.
EWW2iBASE = Emissions from each Group 2 wastewater stream i at the 
baseline date. EWW2iBASE is calculated according to paragraph 
(h)(5) of this section.
(0.1) EBFEPV1iu = Emissions from each Group 1 batch front-end 
process vent i if the applicable reference control technology had been 
applied to the uncontrolled emissions. EBFEPViu is calculated 
according to paragraph (h)(6)(i) of this section.
EBFEPV1iACTUAL = Emissions from each Group 1 batch front-end 
process vent i that is controlled to a level more stringent than the 
reference control technology. EBFEPV1iACTUAL is calculated 
according to paragraph (h)(6)(ii) of this section.
(0.1)EABV1iu = Emissions from each Group 1 aggregate batch vent 
stream i if the applicable reference control technology had been 
applied to the uncontrolled emissions. EABV1iu is calculated 
according to paragraph (h)(7)(i) of this section.
EABV1iACTUAL = Emissions from each Group 1 aggregate batch vent 
stream i that is controlled to a level more stringent than the 
reference control technology or standard. EABV1iACTUAL is 
calculated according to paragraph (h)(7)(ii) of this section.
EBFEPV2iBASE = Emissions from each Group 2 batch front-end process 
vent i at the baseline date. EBFEPV2iBASE is calculated according 
to paragraph (h)(6)(iv) of this section.
EBFEPV2iACTUAL = Emissions from each Group 2 batch front-end 
process vent i that is controlled. EBFEPV2iACTUAL is calculated 
according to paragraph (h)(6)(iii) of this section.
EABV2iBASE = Emissions from each Group 2 aggregate batch vent 
stream i at the baseline date. EABV2iBASE is calculated according 
to paragraph (g)(7)(iv) of this section.
EABV2iACTUAL = Emissions from each Group 2 aggregate batch vent 
stream i that is controlled. EABV2iACTUAL is calculated according 
to paragraph (g)(7)(iii) of this section.

[[Page 46963]]

n = Number of Group 1 emission points included in the emissions 
average. The value of n is not necessarily the same for continuous 
front-end process vents, batch front-end process vents, aggregate batch 
vent streams, storage vessels, wastewater streams, or the collection of 
process sections within the affected source.
m = Number of Group 2 emission points included in the emissions 
average. The value of m is not necessarily the same for continuous 
front-end process vents, batch front-end process vents, aggregate batch 
vent streams, storage vessels, wastewater streams, or the collection of 
process sections within the affected source.
    (i) Except as specified in paragraph (h)(1)(iv) of this section, 
for an emission point controlled using a reference control technology, 
the percent reduction for calculating credits shall be no greater than 
the nominal efficiency associated with the reference control 
technology, unless a higher nominal efficiency is assigned as specified 
in paragraph (h)(1)(ii) of this section.
    (ii) For an emission point controlled to a level more stringent 
than the reference control technology, the nominal efficiency for 
calculating credits shall be assigned as described in paragraph (i) of 
this section. A reference control technology may be approved for use in 
a different manner and assigned a higher nominal efficiency according 
to the procedures in paragraph (i) of this section. A reference control 
technology may be approved for use in a different manner and assigned a 
higher nominal efficiency according to the procedure in paragraph (i) 
of this section.
    (iii) For an emission point controlled using a pollution prevention 
measure, except for back-end process operation emissions, the nominal 
efficiency for calculating credits shall be as determined as described 
in paragraph (j) of this section. Emissions for back-end process 
operations shall be determined as described in paragraph (h)(4) of this 
section.
    (iv) For Group 1 and Group 2 batch front-end process vents and 
Group 1 and Group 2 aggregate batch vent streams, the percent reduction 
for calculating credits shall be the percent reduction determined 
according to the procedures in paragraphs (h)(6)(ii) and (h)(6)(iii) of 
this section for batch front-end process vents and paragraphs 
(h)(7)(ii) and (h)(7)(iii) of this section for aggregate batch vent 
streams.
    (2) Emissions from continuous front-end process vents shall be 
determined as follows:
    (i) Uncontrolled emissions from Group 1 continuous front-end 
process vents, ECFEPV1iu, shall be calculated according to the 
procedures and equation for ECFEPViu in paragraphs (g)(2)(i) and 
(g)(2)(ii) of this section.
    (ii) Actual emissions from Group 1 continuous front-end process 
vents controlled using a technology with an approved nominal efficiency 
greater than 98 percent or a pollution prevention measure achieving 
greater than 98 percent emission reduction, ECFEPV1iACTUAL, shall 
be calculated using Equation 42.
[GRAPHIC] [TIFF OMITTED] TR05SE96.039

Where:
ECFEPV1iACTUAL = Emissions for each Group 1 continuous front-end 
process vent i that is controlled to a level more stringent than the 
reference control technology.
ECFEPV1iu = Emissions from each Group 1 continuous front-end 
process vent i if the reference control technology had been applied to 
the uncontrolled emissions.
    (iii) The following procedures shall be used to calculate actual 
emissions from Group 2 continuous front-end process vents, 
ECFEPV2iACTUAL:
    (A) For a Group 2 continuous front-end process vent controlled by a 
control device, a recovery device applied as a pollution prevention 
project, or a pollution prevention measure, where the control achieves 
a percent reduction less than or equal to 98 percent reduction, 
Equation 43 shall be used.
[GRAPHIC] [TIFF OMITTED] TR05SE96.040

    Where:
ECFEPV2iACTUAL=Emissions from each Group 2 continuous
front-end process vent i that is controlled.
ECFEPV2iu=Emissions from each Group 2 continuous front-end process 
vent i if the reference control technology had been applied to the 
uncontrolled emissions.
    (1) ECFEPV2iu shall be calculated according to the equations 
and procedures for ECFEPViu in paragraphs (g)(2)(i) and 
(g)(2)(ii) of this section, except as provided in paragraph 
(h)(2)(iii)(A)(3) of this section.
    (2) The percent reduction shall be calculated according to the 
procedures in paragraphs (g)(2)(iii)(B)(1) through (g)(2)(iii)(B)(3) of 
this section, except as provided in paragraph (h)(2)(iii)(A)(4) of this 
section.
    (3) If a recovery device was added as part of a pollution 
prevention project, ECFEPV2iu shall be calculated prior to that 
recovery device. The equation for ECFEPViu in paragraph (g)(2)(ii) 
of this section shall be used to calculate ECFEPV2iu; however, the 
sampling site for measurement of vent stream flow rate and organic HAP 
concentration shall be at the inlet of the recovery device.
    (4) If a recovery device was added as part of a pollution 
prevention project, the percent reduction shall be demonstrated by 
conducting a performance test at the inlet and outlet of that recovery 
device.
    (B) For a Group 2 continuous front-end process vent controlled 
using a technology with an approved nominal efficiency greater than 98 
percent or a pollution prevention measure achieving greater than 98 
percent reduction, Equation 44 shall be used.

[[Page 46964]]

[GRAPHIC] [TIFF OMITTED] TR05SE96.041


Where:
ECFEPV2iACTUAL=Emissions from each Group 2 continuous
front-end process vent i that is controlled.
ECFEPV2iu=Emissions from each Group 2 continuous front-end process 
vent i if the reference control technology had been applied to the 
uncontrolled emissions.
    (iv) Emissions from Group 2 continuous front-end process vents at 
baseline, ECFEPV2iBASE, shall be calculated as follows:
    (A) If the continuous front-end process vent was uncontrolled on 
November 15, 1990, ECFEPV2iBASE=ECFEPV2iu and shall be 
calculated according to the procedures and equation for ECFEPViu 
in paragraphs (g)(2)(i) and (g)(2)(ii) of this section.
    (B) If the continuous front-end process vent was controlled on 
November 15, 1990, Equation 45 shall be used.
[GRAPHIC] [TIFF OMITTED] TR05SE96.042

    (1) ECFEPV2iu is calculated according to the procedures and 
equation for ECFEPViu in paragraphs (g)(2)(i) and (g)(2)(ii) of 
this section.
    (2) The percent reduction shall be calculated according to the 
procedures specified in paragraphs (g)(2)(iii)(B)(1) through 
(g)(2)(iii)(B)(3) of this section.
    (C) If a recovery device was added as part of a pollution 
prevention project initiated after November 15, 1990, 
ECFEPV2iBASE=ECFEPV2iu, where ECFEPV2iu is calculated 
according to paragraph (h)(2)(iii)(A)(3) of this section.
    (3) Emissions from storage vessels shall be calculated using the 
procedures specified in Sec. 63.150(h)(3) of subpart G.
    (4) Emissions from back-end process operations shall be calculated 
as follows:
    (i) EBEPACTUAL shall be calculated according to the equation 
for EBEPACTUAL contained in paragraph (g)(4)(i) of this section.
    (ii) EBEPc shall be calculated according to the equation for 
EBEPc contained in paragraph (g)(4)(ii) of this section.
    (5) Emissions from wastewater streams shall be calculated using the 
procedures specified in Sec. 63.150(h)(5) of subpart G.
    (6) Emissions from batch front-end process vents shall be 
determined as follows:
    (i) Uncontrolled emissions from Group 1 batch front-end process 
vents (EBFEPV1iu) shall be calculated according using the 
procedures specified in Sec. 63.488(b).
    (ii) Actual emissions from Group 1 batch front-end process vents 
controlled to a level more stringent than the reference control 
technology (EBFEPV1iACTUAL) shall be calculated using Equation 46, 
where percent reduction is for the batch cycle.
[GRAPHIC] [TIFF OMITTED] TR05SE96.043

    (A) The percent reduction for the batch cycle shall be calculated 
according to the procedures in Sec. 63.490(c)(2).
    (B) The percent reduction for control devices shall be determined 
according to the procedures in Sec. 63.490(c)(2)(i) through 
(c)(2)(iii).
    (C) The percent reduction of pollution prevention measures shall be 
calculated using the procedures specified in paragraph (j) of this 
section.
    (iii) Actual emissions from Group 2 batch front-end process vents 
(EBFEPV2iACTUAL) shall be calculated using Equation 47 and the 
procedures in paragraphs (h)(6)(ii)(A) through (h)(6)(ii)(C) of this 
section. EBFEPV2iu shall be calculated using the procedures 
specified in Sec. 63.488(b).
[GRAPHIC] [TIFF OMITTED] TR05SE96.044

    (iv) Emissions from Group 2 batch front-end process vents at 
baseline shall be calculated as follows:
    (A) If the batch front-end process vent was uncontrolled on 
November 15, 1990, EBFEPV2iBASE=EBFEPV2iu and shall be 
calculated according to the procedures using the procedures specified 
in Sec. 63.488(b).
    (B) If the batch front-end process vent was controlled on November 
15, 1990, use Equation 48 and the procedures in paragraphs 
(h)(6)(ii)(A) through (h)(6)(ii)(C) of this section. EBFEPV2iu 
shall be calculated using the procedures specified in Sec. 63.488(b).
[GRAPHIC] [TIFF OMITTED] TR05SE96.045


[[Page 46965]]


    (7) Emissions from aggregate batch vent streams shall be determined 
as follows:
    (i) Uncontrolled emissions from Group 1 aggregate batch vent 
streams (EABV1iu) shall be calculated according to the procedures 
and equation for EABViu in paragraphs (g)(7)(i) and (g)(7)(ii) of 
this section.
    (ii) Actual emissions from Group 1 aggregate batch vent streams 
controlled to a level more stringent than the reference control 
technology (EABV1iACTUAL) shall be calculated using Equation 49.
[GRAPHIC] [TIFF OMITTED] TR05SE96.046

    (A) The percent reduction for control devices shall be determined 
according to the procedures in Sec. 63.490(e).
    (B) The percent reduction of pollution prevention measures shall be 
calculated using the procedures specified in paragraph (j) of this 
section.
    (iii) Actual emissions from Group 2 aggregate batch vents streams 
(EABV2iACTUAL) shall be calculated using Equation 50 and the 
procedures in paragraphs (h)(7)(ii)(A) through (h)(7)(ii)(B) of this 
section. EABV2iu shall be calculated according to the equations 
and procedures for EABViu in paragraphs (g)(7)(i) and (g)(7)(ii) 
of this section.
[GRAPHIC] [TIFF OMITTED] TR05SE96.047

    (iv) Emissions from Group 2 aggregate batch vent streams at 
baseline shall be calculated as follows:
    (A) If the aggregate batch vent stream was uncontrolled on November 
15, 1990, EABV2iBASE=EABV2iu and shall be calculated 
according to the procedures and equation for EABViu in paragraph 
(g)(7)(i) and (g)(7)(ii) of this section.
    (B) If the aggregate batch vent stream was controlled on November 
15, 1990, use Equation 51 and the procedures in paragraphs 
(h)(7)(ii)(A) through (h)(7)(ii)(B) of this section. EABV2iu shall 
be calculated according to the equations and procedures for EABViu 
in paragraphs (g)(7)(i) and (g)(7)(ii) of this section.
[GRAPHIC] [TIFF OMITTED] TR05SE96.048

    (i) The following procedures shall be followed to establish nominal 
efficiencies for emission controls for storage vessels, continuous 
front-end process vents, and process wastewater streams. The procedures 
in paragraphs (i)(1) through (i)(6) of this section shall be followed 
for control technologies that are different in use or design from the 
reference control technologies and achieve greater percent reductions 
than the percent efficiencies assigned to the reference control 
technologies in Sec. 63.111 of subpart G.
    (1) In those cases where the owner or operator is seeking 
permission to take credit for use of a control technology that is 
different in use or design from the reference control technology, and 
the different control technology will be used in more than three 
applications at a single plant-site, the owner or operator shall submit 
the information specified in paragraphs (i)(1)(i) through (i)(1)(iv) of 
this section to the Director of the EPA Office of Air Quality Planning 
and Standards, in writing.
    (i) Emission stream characteristics of each emission point to which 
the control technology is or will be applied, including the kind of 
emission point, flow, organic HAP concentration, and all other stream 
characteristics necessary to design the control technology or determine 
its performance.
    (ii) Description of the control technology, including design 
specifications.
    (iii) Documentation demonstrating to the Administrator's 
satisfaction the control efficiency of the control technology. This may 
include performance test data collected using an appropriate EPA Method 
or any other method validated according to Method 301 of appendix A. If 
it is infeasible to obtain test data, documentation may include a 
design evaluation and calculations. The engineering basis of the 
calculation procedures and all inputs and assumptions made in the 
calculations shall be documented.
    (iv) A description of the parameter or parameters to be monitored 
to ensure that the control technology will be operated in conformance 
with its design and an explanation of the criteria used for selection 
of that parameter (or parameters).
    (2) The Administrator shall determine within 120 operating days 
whether an application presents sufficient information to determine 
nominal efficiency. The Administrator reserves the right to request 
specific data in addition to the items listed in paragraph (i)(1) of 
this section.
    (3) The Administrator shall determine within 120 operating days of 
the submittal of sufficient data whether a control technology shall 
have a nominal efficiency and the level of that nominal efficiency. If, 
in the Administrator's judgment, the control technology achieves a 
level of emission reduction greater than the reference control 
technology for a particular kind of emission point, the Administrator 
will publish a Federal Register notice establishing a nominal 
efficiency for the control technology.

[[Page 46966]]

    (4) The Administrator may grant permission to take emission credits 
for use of the control technology. The Administrator may also impose 
requirements that may be necessary to ensure operation and maintenance 
to achieve the specified nominal efficiency.
    (5) In those cases where the owner or operator is seeking 
permission to take credit for use of a control technology that is 
different in use or design from the reference control technology and 
the different control technology will be used in no more than three 
applications at a single plant site, the information listed in 
paragraph (i)(1)(i) can be submitted to the permitting authority for 
the affected source for approval instead of the Administrator.
    (i) In these instances, use and conditions for use of the control 
technology can be approved by the permitting authority as part of an 
operating permit application or modification. The permitting authority 
shall follow the procedures specified in paragraphs (i)(2) through 
(i)(4) of this section except that, in these instances, a Federal 
Register notice is not required to establish the nominal efficiency for 
the different technology.
    (ii) If, in reviewing the application, the permitting authority 
believes the control technology has broad applicability for use by 
other sources, the permitting authority shall submit the information 
provided in the application to the Director of the EPA Office of Air 
Quality Planning and Standards. The Administrator shall review the 
technology for broad applicability and may publish a Federal Register 
notice; however, this review shall not affect the permitting 
authority's approval of the nominal efficiency of the control 
technology for the specific application.
    (6) If, in reviewing an application for a control technology for an 
emission point, the Administrator or permitting authority determines 
that the control technology is not different in use or design from the 
reference control technology, the Administrator or permitting authority 
shall deny the application.
    (j) The following procedures shall be used for calculating the 
efficiency (percent reduction) of pollution prevention measures for 
storage vessels, continuous front-end process vents, batch front-end 
process vents, aggregate batch vent streams, and wastewater streams:
    (1) A pollution prevention measure is any practice which meets the 
criteria of paragraphs (j)(1)(i) and (j)(1)(ii) of this section.
    (i) A pollution prevention measure is any practice that results in 
a lesser quantity of organic HAP emissions per unit of product released 
to the atmosphere prior to out-of-process recycling, treatment, or 
control of emissions, while the same product is produced.
    (ii) Pollution prevention measures may include substitution of 
feedstocks that reduce organic HAP emissions; alterations to the 
production process to reduce the volume of materials released to the 
environment; equipment modifications; housekeeping measures; and in-
process recycling that returns waste materials directly to production 
as raw materials. Production cutbacks do not qualify as pollution 
prevention.
    (2) The emission reduction efficiency of pollution prevention 
measures implemented after November 15, 1990, can be used in 
calculating the actual emissions from an emission point in the debit 
and credit equations in paragraphs (g) and (h) of this section.
    (i) For pollution prevention measures, the percent reduction is 
used in the equations in paragraphs (g)(2) through (g)(7) of this 
section and paragraphs (h)(2) through (h)(7) of this section is the 
percent difference between the monthly organic HAP emissions for each 
emission point after the pollution prevention measure for the most 
recent month versus monthly emissions from the same emission point 
before the pollution prevention measure, adjusted by the volume of 
product produced during the two monthly periods.
    (ii) Equation 52 shall be used to calculate the percent reduction 
of a pollution prevention measure for each emission point.
[GRAPHIC] [TIFF OMITTED] TR05SE96.049

where:

Percent reduction=Efficiency of pollution prevention measure (percent 
organic HAP reduction).
EB=Monthly emissions before the pollution prevention measure, Mg/
month, determined as specified in paragraphs (j)(2)(ii)(A), 
(j)(2)(ii)(B), and (j)(2)(ii)(C) of this section.
Epp=Monthly emissions after the pollution prevention measure, Mg/
month, as determined for the most recent month, determined as specified 
in either paragraphs (j)(2)(ii)(D) or (j)(2)(ii)(E) of this section.
PB=Monthly production before the pollution prevention measure, Mg/
month, during the same period over which EB is calculated.
Ppp=Monthly production after the pollution prevention measure, Mg/
month, as determined for the most recent month.

    (A) The monthly emissions before the pollution prevention measure, 
EB, shall be determined in a manner consistent with the equations 
and procedures in paragraph (g)(2) of this section for continuous 
front-end process vents, paragraph (g)(3) of this section for storage 
vessels, paragraph (g)(6) of this section for batch front-end process 
vents, and paragraph (g)(7) of this section for aggregate batch vent 
streams.
    (B) For wastewater, E B shall be calculated according to 
Sec. 63.150(j)(2)(ii)(B) of subpart G.
    (C) If the pollution prevention measure was implemented prior to 
September 5, 1996, records may be used to determine E B.
    (D) The monthly emissions after the pollution prevention measure, E 
pp, may be determined during a performance test or by a design 
evaluation and documented engineering calculations. Once an emissions-
to-production ratio has been established, the ratio can be used to 
estimate monthly emissions from monthly production records.
    (E) For wastewater, E pp shall be calculated according to 
Sec. 63.150(j)(2)(ii)(E) of subpart G.
    (iii) All equations, calculations, test procedures, test results, 
and other information used to determine the percent reduction achieved 
by a pollution prevention measure for each emission point shall be 
fully documented.

[[Page 46967]]

    (iv) The same pollution prevention measure may reduce emissions 
from multiple emission points. In such cases, the percent reduction in 
emissions for each emission point must be calculated.
    (v) For the purposes of the equations in paragraphs (h)(2) through 
(h)(7) of this section, used to calculate credits for emission points 
controlled more stringently than the reference control technology, the 
nominal efficiency of a pollution prevention measure is equivalent to 
the percent reduction of the pollution prevention measure. When a 
pollution prevention measure is used, the owner or operator of an 
affected source is not required to apply to the Administrator for a 
nominal efficiency and is not subject to paragraph (i) of this section.
    (k) The owner or operator must demonstrate that the emissions from 
the emission points proposed to be included in the emissions average 
will not result in greater hazard, or at the option of the 
Administrator, greater risk to human health or the environment than if 
the emission points were controlled according to the provisions in 
Secs. 63.484, 63.485, 63.486, 63.493, and 63.501.
    (1) This demonstration of hazard or risk equivalency shall be made 
to the satisfaction of the Administrator.
    (i) The Administrator may require owners and operators to use 
specific methodologies and procedures for making a hazard or risk 
determination.
    (ii) The demonstration and approval of hazard or risk equivalency 
shall be made according to any guidance that the Administrator makes 
available for use.
    (2) Owners and operators shall provide documentation demonstrating 
the hazard or risk equivalency of their proposed emissions average in 
their operating permit application or in their Emissions Averaging Plan 
if an operating permit application has not yet been submitted.
    (3) An Emissions Averaging Plan that does not demonstrate hazard or 
risk equivalency to the satisfaction of the Administrator shall not be 
approved. The Administrator may require such adjustments to the 
Emissions Averaging Plan as are necessary in order to ensure that the 
emissions average will not result in greater hazard or risk to human 
health or the environment than would result if the emission points were 
controlled according to Secs. 63.484, 63.485, 63.486, 63.493, and 
63.501.
    (4) A hazard or risk equivalency demonstration must:
    (i) Be a quantitative, bona fide chemical hazard or risk 
assessment;
    (ii) Account for differences in chemical hazard or risk to human 
health or the environment; and
    (iii) Meet any requirements set by the Administrator for such 
demonstrations.
    (l) For periods of monitoring excursions, an owner or operator may 
request that the provisions of paragraphs (l)(1) through (l)(4) of this 
section be followed instead of the procedures in paragraphs (f)(2)(i) 
and (f)(2)(ii) of this section.
    (1) The owner or operator shall notify the Administrator of 
monitoring excursions in the Periodic Reports as required in 
Sec. 63.506(e)(6).
    (2) The owner or operator shall demonstrate that other types of 
monitoring data or engineering calculations are appropriate to 
establish that the control device for the emission point was operating 
in such a fashion to warrant assigning full or partial credits and 
debits. This demonstration shall be made to the Administrator's 
satisfaction, and the Administrator may establish procedures for 
demonstrating compliance that are acceptable.
    (3) The owner or operator shall provide documentation of the 
excursion and the other types of monitoring data or engineering 
calculations to be used to demonstrate that the control device for the 
emission point was operating in such a fashion to warrant assigning 
full or partial credits and debits.
    (4) The Administrator may assign full or partial credit and debits 
upon review of the information provided.
    (m) For each emission point included in an emissions average, the 
owner or operator shall perform testing, monitoring, recordkeeping, and 
reporting equivalent to that required for Group 1 emission points 
complying with Secs. 63.484, 63.485, 63.486, 63.493, and 63.501, as 
applicable. If back-end process operations are included in an emissions 
average, the owner or operator shall perform testing, monitoring, 
recordkeeping, and reporting equivalent to that required for back-end 
process operations complying with Sec. 63.493. The specific 
requirements for continuous front-end process vents, batch front-end 
process vents, aggregate batch vent streams, storage vessels, back-end 
process operations, and wastewater are identified in paragraphs (m)(1) 
through (m)(6) of this section.
    (1) For each continuous front-end process vent equipped with a 
flare, incinerator, boiler, or process heater, as appropriate to the 
control technique:
    (i) Determine whether the continuous front-end process vent is 
Group 1 or Group 2 according to the procedures specified in Sec. 63.115 
of subpart G and as required by Sec. 63.485;
    (ii) Conduct initial performance tests to determine percent 
reduction as specified in Sec. 63.116 of subpart G and as required by 
Sec. 63.485; and
    (iii) Monitor the operating parameters, keep records, and submit 
reports as specified in Sec. 63.114, Sec. 63.117(a), and 
Sec. 63.118(a), (f), and (g) of subpart G, as required, for the 
specific control device as required by Sec. 63.485.
    (2) For each continuous front-end process vent equipped with a 
carbon adsorber, absorber, or condenser but not equipped with a control 
device, as appropriate to the control technique:
    (i) Determine the flow rate, organic HAP concentration, and TRE 
index value according to the procedures specified in Sec. 63.115 of 
subpart G; and
    (ii) Monitor the operating parameters, keep records, and submit 
reports according to the procedures specified in Sec. 63.114, 
Sec. 63.117(a), and Sec. 63.118 (b), (f), and (g) of subpart G, as 
required, for the specific recovery device, and as required by 
Sec. 63.485.
    (3) For each storage vessel controlled with an internal floating 
roof, external roof, or a closed vent system with a control device, as 
appropriate to the control technique:
    (i) Perform the monitoring or inspection procedures according to 
the procedures specified in Sec. 63.120 of subpart G, and as required 
by Sec. 63.484;
    (ii) Perform the reporting and recordkeeping procedures according 
to the procedures specified in Secs. 63.122 and 63.123 of subpart G, 
and as required by Sec. 63.484; and
    (iii) For closed vent systems with control devices, conduct an 
initial design evaluation and submit an operating plan according to the 
procedures specified in Sec. 63.120(d) and Sec. 63.122(a)(2) and (b) of 
subpart G, and as required by Sec. 63.484.
    (4) For back-end process operations included in an emissions 
average:
    (i) If stripping technology, and no control or recovery device, is 
used to reduce back-end process operation emissions, the owner or 
operator shall implement the following portions of this subpart:
    (A) Paragraphs (b)(1), (b)(2), and (b)(3) of Sec. 63.495, paragraph 
(b) of Sec. 63.498, and the applicable provisions of Sec. 63.499, or
    (B) Paragraphs (c) (1), (2), and (3) of Sec. 63.495, paragraph (c) 
of Sec. 63.498, and the applicable provisions of Sec. 63.499;
    (ii) If a control or recovery device is used to reduce back-end 
process operation emissions, the owner or operator shall comply with 
Secs. 63.496, 63.497, 63.498(d), and the applicable provisions of 
63.499, and shall

[[Page 46968]]

implement the provisions of these sections.
    (5) For wastewater emission points, as appropriate to the control 
techniques:
    (i) For wastewater treatment processes, conduct tests according to 
the procedures specified in Sec. 63.138(i) and (j) of subpart G, and as 
required by Sec. 63.501;
    (ii) Conduct inspections and monitoring according to the procedures 
specified in Sec. 63.143 of subpart G, and as required by Sec. 63.501;
    (iii) Implement a recordkeeping program according to the procedures 
specified in Sec. 63.147 of subpart G, and as required by Sec. 63.501; 
and
    (iv) Implement a reporting program according to the procedures 
specified in Sec. 63.146 of subpart G, and as required by Sec. 63.501.
    (6) For each batch front-end process vent and aggregate batch vent 
stream equipped with a control device, as appropriate to the control 
technique:
    (i) Determine whether the batch front-end process vent or aggregate 
batch vent stream is Group 1 or Group 2 according to the procedures 
specified in Sec. 63.488;
    (ii) Conduct performance tests according to the procedures 
specified in Sec. 63.490;
    (iii) Conduct monitoring according to the procedures specified in 
Sec. 63.489; and
    (iv) Perform the recordkeeping and reporting procedures according 
to the procedures specified in Secs. 63.491 and 63.492.
    (7) If an emission point in an emissions average is controlled 
using a pollution prevention measure or a device or technique for which 
no monitoring parameters or inspection procedures are required by 
Secs. 63.484, 63.485, 63.486, 63.493, or Sec. 63.501, the owner or 
operator shall submit the information specified in Sec. 63.506(f) for 
alternate monitoring parameters or inspection procedures in the 
Emissions Averaging Plan or operating permit application.
    (n) Records of all information required to calculate emission 
debits and credits shall be retained for 5 years.
    (o) Precompliance Reports, Emission Averaging Plans, Notifications 
of Compliance Status, Periodic Reports, and other reports shall be 
submitted as required by Sec. 63.506.


Sec. 63.504  Additional test methods and procedures.

    (a) Performance testing shall be conducted in accordance with 
Sec. 63.7 (a)(3), (d), (e), (g), and (h) of subpart A, with the 
exceptions specified in paragraphs (a)(1) through (a)(4) of this 
section and the additions specified in paragraph (b) of this section. 
Sections 63.484 through 63.501 also contain specific testing 
requirements.
    (1) Performance tests shall be conducted according to the 
provisions of Sec. 63.7(e) of subpart A, except that performance tests 
shall be conducted at maximum representative operating conditions for 
the process.
    (2) References in Sec. 63.7(g) of subpart A to the Notification of 
Compliance Status requirements in Sec. 63.9(h) shall refer to the 
requirements in Sec. 63.506(e)(5).
    (3) Because the site-specific test plans in Sec. 63.7(c)(3) of 
subpart A are not required, Sec. 63.7(h)(4)(ii) is not applicable.
    (4) The owner or operator shall notify the Administrator of the 
intention to conduct a performance test at least 30 calendar days 
before the performance test is scheduled, to allow the Administrator 
the opportunity to have an observer present during the test.
    (b) Data shall be reduced in accordance with the EPA approved 
methods specified in the applicable subpart or, if other test methods 
are used, the data and methods shall be validated according to the 
protocol in Method 301 of appendix A of this part.


Sec. 63.505  Parameter monitoring levels and excursions.

    (a) Establishment of parameter monitoring levels. The owner or 
operator of a control or recovery device that has one or more parameter 
monitoring level requirements specified under this subpart shall 
establish a maximum or minimum level for each measured parameter using 
the procedures specified in paragraph (b), (c), or (d) of this section. 
The procedures specified in paragraph (b) have been approved by the 
Administrator. The procedures in paragraphs (c) and (d) of this section 
have not been approved by the Administrator, and determination of the 
parameter monitoring level using the procedures in paragraphs (c) or 
(d) of this section and is subject to review and approval by the 
Administrator. The determination and supporting documentation shall be 
included in the Precompliance Report.
    (1) The owner or operator shall operate control and recovery 
devices such that monitored parameters remain above the minimum 
established level or below the maximum established level.
    (2) As specified in Sec. 63.506(e)(5) and Sec. 63.506(e)(8), all 
established levels, along with their supporting documentation and the 
definition of an operating day, shall be approved as part of and 
incorporated into the Notification of Compliance Status or operating 
permit, respectively.
    (3) Nothing in this section shall be construed to allow a 
monitoring parameter excursion caused by an activity that violates 
other applicable provisions of subparts A, F, or G of this part.
    (b) Establishment of parameter monitoring levels based on 
performance tests. The procedures specified in paragraphs (b)(1) 
through (b)(3) of this section shall be used, as applicable, in 
establishing parameter monitoring levels. Level(s) established under 
this paragraph shall be based on the parameter values measured during 
the performance test.
    (1) Storage tanks and wastewater. The maximum and/or minimum 
monitoring levels shall be based on the parameter values measured 
during the performance test, supplemented, if desired, by engineering 
assessments and/or manufacturer's recommendations.
    (2) Continuous front-end process vents and back-end process 
operations complying using control or recovery devices. During initial 
compliance testing, the appropriate parameter shall be continuously 
monitored during the required 1-hour runs. The monitoring level(s) 
shall then be established as the average of the maximum (or minimum) 
point values from the three test runs. The average of the maximum 
values shall be used when establishing a maximum level, and the average 
of the minimum values shall be used when establishing a minimum level.
    (3) Batch front-end process vents. The monitoring level(s) shall be 
established using the procedures specified in paragraphs (b)(3)(i) 
through (b)(3)(iii) of this section, as appropriate. The procedures 
specified in this paragraph may only be used if the batch emission 
episodes, or portions thereof, selected to be controlled were tested, 
and monitoring data were collected, during the entire period in which 
emissions were vented to the control device, as specified in 
Sec. 63.490(c)(1)(i). If the owner or operator chose to test only a 
portion of the batch emission episode, or portion thereof, selected to 
be controlled, as specified in Sec. 63.490(c)(1)(i)(A), the procedures 
in paragraph (c) of this section must be used.
    (i) If more than one batch emission episode or more than one 
portion of a batch emission episode has been selected to be controlled, 
a single level for the batch cycle shall be calculated as follows:
    (A) During initial compliance testing, the appropriate parameter 
shall be

[[Page 46969]]

monitored continuously at all times when batch emission episodes, or 
portions thereof, selected to be controlled are vented to the control 
device.
    (B) The average monitored parameter value shall be calculated for 
each batch emission episode, or portion thereof, in the batch cycle 
selected to be controlled. The average shall be based on all values 
measured during the required performance test.
    (C) If the level to be established is a maximum operating 
parameter, the level shall be defined as the minimum of the average 
parameter values of the batch emission episodes, or portions thereof, 
in the batch cycle selected to be controlled.
    (D) If the level to be established is a minimum operating 
parameter, the level shall be defined as the maximum of the average 
parameter values of the batch emission episodes, or portions thereof, 
in the batch cycle selected to be controlled.
    (E) Alternatively, an average monitored parameter value shall be 
calculated for the entire batch cycle based on all values measured 
during each batch emission episode, or portion thereof, selected to be 
controlled.
    (ii) Instead of establishing a single level for the batch cycle, as 
described in paragraph (b)(3)(i) of this section, an owner or operator 
may establish separate levels for each batch emission episode, or 
portion thereof, selected to be controlled. Each level shall be 
determined as specified in paragraphs (b)(3)(i)(A) and (b)(3)(i)(B) of 
this section.
    (iii) The batch cycle shall be defined in the Notification of 
Compliance Status, as specified in Sec. 63.506(e)(5). The definition 
shall include an identification of each batch emission episode and the 
information required to determine parameter monitoring compliance for 
partial batch cycles (i.e., when part of a batch cycle is accomplished 
during two different operating days).
    (4) Aggregate batch vent streams. For aggregate batch vent streams, 
the monitoring level shall be established in accordance with paragraph 
(b)(2) of this section.
    (c) Establishment of parameter monitoring levels based on 
performance tests, engineering assessments, and/or manufacturer's 
recommendations. As required in paragraph (a) of this section, the 
information specified in paragraphs (c)(2) and (c)(3) of this section 
shall be provided in the Precompliance Report.
    (1) Parameter monitoring levels established under this paragraph 
shall be based on the parameter values measured during the performance 
test supplemented by engineering assessments and manufacturer's 
recommendations. Performance testing is not required to be conducted 
over the entire range of expected parameter values.
    (2) The specific level of the monitored parameter(s) for each 
emission point.
    (3) The rationale for the specific level for each parameter for 
each emission point, including any data and calculations used to 
develop the level and a description of why the level indicates proper 
operation of the control or recovery device.
    (d) Establishment of parameter monitoring based on engineering 
assessments and/or manufacturer's recommendations. If a performance 
test is not required by this subpart for a control or recovery device, 
the maximum or minimum level may be based solely on engineering 
assessments and/or manufacturer's recommendations. As required in 
paragraph (a) of this section, the determined level and all supporting 
documentation shall be provided in the Precompliance Report.
    (e) Demonstration of compliance with back-end process provisions 
using stripper parameter monitoring. If the owner or operator is 
demonstrating compliance with Sec. 63.495 using stripper parameter 
monitoring, stripper parameter levels shall be established for each 
grade in accordance with paragraphs (e)(1) and (e)(2) of this section. 
A single set of stripper parameter levels can be representative of 
multiple grades.
    (1) For each grade, the owner or operator shall calculate the 
residual organic HAP content using the procedures in paragraphs 
(e)(1)(i) and (e)(1)(ii) of this section.
    (i) The location of the sampling shall be in accordance with 
Sec. 63.495(d).
    (ii) The residual organic HAP content in each sample is to be 
determined using specified methods.
    (2) For each grade, the owner or operator shall establish stripper 
operating parameter levels that represent stripper operation during the 
residual organic HAP content determination in paragraph (e)(1) of this 
section. The stripper operating parameters shall include, at a minimum, 
temperature, pressure, steaming rates (for steam strippers), and some 
parameter that is indicative of residence time.
    (3) After the initial determinations, an owner or operator can add 
a grade, with corresponding stripper parameter levels, using the 
procedures in paragraphs (e)(1) and (e)(2) of this section. The results 
of this determination shall be submitted in the next periodic report.
    (4) An owner or operator complying with the residual organic HAP 
limitations in paragraph (a) of Sec. 63.494 using stripping, and 
demonstrating compliance by stripper parameter monitoring, shall 
redetermine the residual organic HAP content for all affected grades 
whenever process changes are made. For the purposes of this section, a 
process change is any action that would reasonably be expected to 
impair the performance of the stripping operation. For the purposes of 
this section, examples of process changes may include changes in 
production capacity or production rate, or removal or addition of 
equipment. For purposes of this paragraph, process changes do not 
include: Process upsets; unintentional, temporary process changes; or 
changes that reduce the residual organic HAP content of the elastomer.
    (f) Compliance determinations. The provisions of this paragraph 
apply only to emission points and control or recovery devices for which 
continuous monitoring is required under this subpart.
    (1) The parameter monitoring data for storage vessels, front-end 
process vents, back-end process operations complying through the use of 
control or recovery devices, process wastewater streams, and emission 
points included in emissions averages that are required to perform 
continuous monitoring shall be used to determine compliance for the 
monitored control or recovery devices.
    (2) Except as provided in paragraph (f)(3) and (i) of this section, 
for each excursion, as defined in paragraphs (g) and (h) of this 
section, the owner or operator shall be deemed out of compliance with 
the provisions of this subpart.
    (3) If the daily average value of a monitored parameter is above 
the maximum level or below the minimum level established, or if 
monitoring data cannot be collected during monitoring device 
calibration check or monitoring device malfunction, but the affected 
source is operated during the periods of startup, shutdown, or 
malfunction in accordance with the affected source's Startup, Shutdown, 
and Malfunction Plan, then the event shall not be considered a 
monitoring parameter excursion.
    (g) Parameter monitoring excursion definitions. (1) For storage 
vessels, continuous front-end process vents, aggregate batch vent 
streams, back-end process operations complying through the use of 
control or recovery devices, and wastewater streams, an excursion

[[Page 46970]]

means any of the three cases listed in paragraphs (g)(1)(i) through 
(g)(1)(iii) of this section. For a control or recovery device where 
multiple parameters are monitored, if one or more of the parameters 
meets the excursion criteria in paragraphs (g)(1)(i) through 
(g)(1)(iii) of this section, this is considered a single excursion for 
the control or recovery device.
    (i) When the daily average value of one or more monitored 
parameters is above the maximum level or below the minimum level 
established for the given parameters.
    (ii) When the period of control or recovery device operation is 4 
hours or greater in an operating day and monitoring data are 
insufficient, as defined in paragraph (g)(1)(iv) of this section, to 
constitute a valid hour of data for at least 75 percent of the 
operating hours.
    (iii) When the period of control or recovery device operation is 
less than 4 hours in an operating day and more than two of the hours 
during the period of operation do not constitute a valid hour of data 
due to insufficient monitoring data, as defined in paragraph (g)(1)(iv) 
of this section.
    (iv) Monitoring data are insufficient to constitute a valid hour of 
data, as used in paragraphs (g)(1)(ii) and (g)(1)(iii) of this section, 
if measured values are unavailable for any of the 15-minute periods 
within the hour. For data compression systems approved under 
Sec. 63.506(g)(3), monitoring data are insufficient to calculate a 
valid hour of data if there are less than four data measurements made 
during the hour.
    (2) For batch front-end process vents, an excursion means one of 
the two cases listed in paragraphs (g)(2)(i) and (g)(2)(ii) of this 
section. For a control device where multiple parameters are monitored, 
if one or more of the parameters meets the excursion criteria in either 
paragraph (g)(2)(i) or (g)(2)(ii) of this section, this is considered a 
single excursion for the control device.
    (i) When the batch cycle daily average value of one or more 
monitored parameters is above the maximum or below the minimum 
established level for the given parameters.
    (ii) When monitoring data are insufficient. Monitoring data shall 
be considered insufficient when measured values are not available for 
at least 75 percent of the 15-minute periods when batch emission 
episodes, or portions thereof, selected to be controlled are being 
vented to the control device during the operating day.
    (h) Excursion definitions for back-end operations complying through 
stripping. (1) For back-end process operations complying through the 
use of stripping technology, and demonstrating compliance by sampling, 
an excursion means one of the two cases listed in paragraphs (h)(1)(i) 
and (h)(1)(ii) of this section.
    (i) When the monthly weighted average residual organic HAP content 
is above the applicable residual organic HAP limitation in Sec. 63.494; 
or
    (ii) When less than 75 percent of the samples required in 1 month 
are taken and analyzed in accordance with the provisions of 
Sec. 63.495(b).
    (2) For back-end process operations complying through the use of 
stripping technology, and demonstrating compliance by stripper 
parameter monitoring, an excursion means one of the three cases listed 
in paragraphs (h)(2)(i), (h)(2)(ii), and (h)(2)(iii) of this section.
    (i) When the monthly weighted average residual organic HAP content 
is above the applicable residual organic HAP limitation in Sec. 63.494;
    (ii) When an owner or operator fails to sample and analyze the 
organic HAP content of a sample for a grade with an hourly average 
stripper operating parameter value not in accordance with the 
established monitoring parameter levels for that parameter; or
    (iii) When an owner or operator does not collect sufficient 
monitoring data for at least 75 percent of the grades or batches 
processed during a month. Stripper monitoring data are considered 
insufficient if monitoring parameters are obtained for less than 75 
percent of the 15-minute periods during the processing of a grade, and 
a sample of that grade or batch is not taken and analyzed to determine 
the residual organic HAP content.
    (i) Excused excursions. A number of excused excursions shall be 
allowed for each control or recovery device for each semiannual period. 
The number of excused excursions for each semiannual period is 
specified in paragraphs (i)(1) through (i)(6) of this section. This 
paragraph applies to affected sources required to submit Periodic 
Reports semiannually or quarterly. The first semiannual period is the 
6-month period starting the date the Notification of Compliance Status 
is due.
    (1) For the first semiannual period--six excused excursions.
    (2) For the second semiannual period--five excused excursions.
    (3) For the third semiannual period--four excused excursions.
    (4) For the fourth semiannual period--three excused excursions.
    (5) For the fifth semiannual period--two excused excursions.
    (6) For the sixth and all subsequent semiannual periods--one 
excused excursion.


Sec. 63.506   General recordkeeping and reporting provisions.

    (a) Data retention. Each owner or operator of an affected source 
shall keep copies of all applicable records and reports required by 
this subpart for at least 5 years, unless otherwise specified in this 
subpart.
    (b) Subpart A requirements. The owner or operator of an affected 
source shall comply with the applicable recordkeeping and reporting 
requirements in 40 CFR part 63, subpart A as specified in Table 1 of 
this subpart. These requirements include, but are not limited to, the 
requirements specified in paragraphs (b)(1) and (b)(2) of this section.
    (1) Startup, shutdown, and malfunction plan. The owner or operator 
of an affected source shall develop and implement a written startup, 
shutdown, and malfunction plan as specified in Sec. 63.6(e)(3) of 
subpart A. This plan shall describe, in detail, procedures for 
operating and maintaining the affected source during periods of 
startup, shutdown, and malfunction and a program for corrective action 
for malfunctioning process and air pollution control equipment used to 
comply with this subpart. The affected source shall keep this plan 
onsite and shall incorporate it by reference into their operating 
permit. Records associated with the plan shall be kept as specified in 
paragraphs (b)(1)(i)(A) through (b)(1)(i)(D) of this section. Reports 
related to the plan shall be submitted as specified in paragraph 
(b)(1)(ii) of this section.
    (i) Records of startup, shutdown, and malfunction. The owner or 
operator shall keep the records specified in paragraphs (b)(1)(i)(A) 
through (b)(1)(i)(D) of this section.
    (A) Records of the occurrence and duration of each malfunction of 
air pollution control equipment or continuous monitoring systems used 
to comply with this subpart.
    (B) For each startup, shutdown, or malfunction, a statement that 
the procedures specified in the affected source's startup, shutdown, 
and malfunction plan were followed; alternatively, documentation of any 
actions taken that are not consistent with the plan.
    (C) For continuous monitoring systems used to comply with this 
subpart, records documenting the completion of calibration checks and 
maintenance of continuous monitoring

[[Page 46971]]

systems that are specified in the manufacturer's instructions.
    (D) Records specified in paragraphs (b)(1)(i)(B) and (b)(1)(i)(C) 
of this section are not required if they pertain solely to Group 2 
emission points that are not included in an emissions average.
    (ii) Reports of startup, shutdown, and malfunction. For the 
purposes of this subpart, the semiannual startup, shutdown, and 
malfunction reports shall be submitted on the same schedule as the 
Periodic Reports required under paragraph (e)(6) of this section 
instead of the schedule specified in Sec. 63.10(d)(5)(i) of subpart A. 
The reports shall include the information specified in paragraphs 
(b)(1)(i)(A) through (b)(1)(i)(C) of this section and shall contain the 
name, title, and signature of the owner or operator or other 
responsible official who is certifying its accuracy.
    (2) Application for approval of construction or reconstruction. For 
new affected sources, each owner or operator shall comply with the 
provisions in Sec. 63.5 of subpart A regarding construction and 
reconstruction, excluding the provisions specified in 
Sec. 63.5(d)(1)(ii)(H), (d)(1)(iii), (d)(2), and (d)(3)(ii) of subpart 
A.
    (c) Subpart H requirements. Owners or operators of affected sources 
shall comply with the reporting and recordkeeping requirements in 
subpart H, except as specified in Sec. 63.502(g) through 
Sec. 63.502(i).
    (d) Recordkeeping and documentation. Owners or operators required 
to keep continuous records shall keep records as specified in 
paragraphs (d)(1) through (d)(8) of this section, unless an alternative 
recordkeeping system has been requested and approved as specified in 
paragraph (f), (g), or (h) of this section. Documentation requirements 
are specified in paragraphs (d)(9) and (d)(10) of this section.
    (1) The monitoring system shall measure data values at least once 
every 15 minutes.
    (2) The owner or operator shall record either:
    (i) Each measured data value; or
    (ii) Block average values for 1 hour or shorter periods calculated 
from all measured data values during each period. If values are 
measured more frequently than once per minute, a single value for each 
minute may be used to calculate the hourly (or shorter period) block 
average instead of all measured values; or
    (iii) For batch front-end process vents, each batch cycle average 
or batch emission episode average, as appropriate, in addition to each 
measured data value recorded as required in paragraph (d)(2)(i) of this 
section.
    (3) Daily average (or batch cycle daily average) values of each 
continuously monitored parameter shall be calculated for each operating 
day as specified in paragraphs (d)(3)(i) through (d)(3)(ii) of this 
section, except as specified in paragraph (d)(6) of this section.
    (i) The daily average value or batch cycle daily average shall be 
calculated as the average of all parameter values recorded during the 
operating day. As specified in Sec. 63.491(e)(2)(i), only parameter 
values measured during those batch emission episodes, or portions 
thereof, in the batch cycle that the owner or operator has chosen to 
control shall be used to calculate the average. The calculated average 
shall cover a 24-hour period if operation is continuous, or the number 
of hours of operation per operating day if operation is not continuous.
    (ii) The operating day shall be the period that the owner or 
operator specifies in the operating permit or the Notification of 
Compliance Status. It may be from midnight to midnight or another 24-
hour period.
    (4) Records required when out of compliance. If the daily average 
(or batch cycle daily average) value of a monitored parameter for a 
given operating day is below the minimum level or above the maximum 
level established in the Notification of Compliance Status or operating 
permit, the owner or operator shall retain the data recorded that 
operating day under paragraph (d)(2) of this section.
    (5) Records required when in compliance for daily average value or 
batch cycle daily average value. If the daily average (or batch cycle 
daily average) value of a monitored parameter for a given operating day 
is above the minimum level or below the maximum level established in 
the Notification of Compliance Status or operating permit, the owner or 
operator shall either:
    (i) Retain block average values for 1 hour or shorter periods for 
that operating day; or
    (ii) Retain the data recorded in paragraphs (d)(2)(i) and 
(d)(2)(iii) of this section.
    (6) Records required when all recorded values are in compliance. If 
all recorded values for a monitored parameter during an operating day 
are above the minimum level or below the maximum level established in 
the Notification of Compliance Status or operating permit, the owner or 
operator may record that all values were above the minimum level or 
below the maximum level rather than calculating and recording a daily 
average (or batch cycle daily average) for that operating day. For 
these operating days, the records required in paragraph (d)(5) of this 
section are required.
    (7) Monitoring data recorded during periods of monitoring system 
breakdowns, repairs, calibration checks, and zero (low-level) and high-
level adjustments shall not be included in any average computed under 
this subpart. Records shall be kept of the times and durations of all 
such periods.
    (8) In addition to the periods specified in paragraph (d)(7) of 
this section, records shall be kept of the times and durations of any 
other periods during process operation or control device operation when 
monitors are not operating. For batch front-end process vents, this 
paragraph only applies during batch emission episodes, or portions 
thereof, that the owner or operator has selected for control.
    (9) For each EPPU that is not part of the affected source because 
it does not use any organic HAP, the owner or operator shall maintain 
the documentation specified in Sec. 63.480(b)(1).
    (10) For each flexible operation unit in which the primary product 
is determined to be something other than an elastomer product, the 
owner or operator shall maintain the documentation specified in 
Sec. 63.480(f)(6).
    (e) Reporting and notification. (1) In addition to the reports and 
notifications required by subparts A and H, as specified in this 
subpart, the owner or operator of an affected source shall prepare and 
submit the reports listed in paragraphs (e)(3) through (e)(8) of this 
section, as applicable.
    (2) All reports required under this subpart shall be sent to the 
Administrator at the addresses listed in Sec. 63.13 of subpart A of 
this part. If acceptable to both the Administrator and the owner or 
operator of a source, reports may be submitted on electronic media.
    (3) Precompliance Report. Affected sources requesting an extension 
for compliance, or requesting approval to use alternative monitoring 
parameters, alternative continuous monitoring and recordkeeping, or 
alternative controls, shall submit a Precompliance Report according to 
the schedule described in paragraph (e)(3)(i) of this section. The 
Precompliance Report shall contain the information specified in 
paragraphs (e)(3)(ii) through (e)(3)(vi) of this section, as 
appropriate.
    (i) Submittal dates. The Precompliance Report shall be submitted to 
the Administrator no later

[[Page 46972]]

than 12 months prior to the compliance date. For new sources, the 
Precompliance Report shall be submitted to the Administrator with the 
application for approval of construction or reconstruction required in 
paragraph (b)(2) of this section.
    (ii) A request for an extension for compliance must be submitted in 
the Precompliance Report, if it has not been submitted to the operating 
permit authority as part of the operating permit application. The 
request for a compliance extension will include the data outlined in 
Sec. 63.6(i)(6)(i)(A), (B), and (D) of subpart A, as required in 
Sec. 63.481(e)(1).
    (iii) The alternative monitoring parameter information required in 
paragraph (f) of this section shall be submitted if, for any emission 
point, the owner or operator of an affected source seeks to comply 
through the use of a control technique other than those for which 
monitoring parameters are specified in this subpart or in subpart G of 
this part, or seeks to comply by monitoring a different parameter than 
those specified in this subpart or in subpart G of this part.
    (iv) If the affected source seeks to comply using alternative 
continuous monitoring and recordkeeping as specified in paragraph (g) 
of this section, the information requested in paragraph (e)(3)(iv)(A) 
or (e)(3)(iv)(B) of this section must be submitted in the Precompliance 
Report.
    (A) The owner or operator must submit notification of the intent to 
use the provisions specified in paragraph (h) of this section; or
    (B) The owner or operator must submit a request for approval to use 
alternative continuous monitoring and recordkeeping provisions as 
specified in paragraph (g) of this section.
    (v) The owner or operator shall report the intent to use 
alternative controls to comply with the provisions of this subpart. 
Alternative controls must be deemed by the Administrator to be 
equivalent to the controls required by the standard, under the 
procedures outlined in Sec. 63.6(g) of subpart A.
    (4) Emissions Averaging Plan. For all existing affected sources 
using emissions averaging, an Emissions Averaging Plan shall be 
submitted for approval according to the schedule and procedures 
described in paragraph (e)(4)(i) of this section. The Emissions 
Averaging Plan shall contain the information specified in paragraph 
(e)(4)(ii) of this section, unless the information required in 
paragraph (e)(4)(ii) of this section is submitted with an operating 
permit application. An owner or operator of an affected source who 
submits an operating permit application instead of an Emissions 
Averaging Plan shall submit the information specified in paragraph 
(e)(8) of this section. In addition, a supplement to the Emissions 
Averaging Plan, as required under paragraph (e)(4)(iii) of this 
section, is to be submitted whenever alternative controls or operating 
scenarios may be used to comply with this subpart. Updates to the 
Emissions Averaging Plan shall be submitted in accordance with 
paragraph (e)(4)(iv) of this section.
    (i) Submittal and approval. The Emissions Averaging Plan shall be 
submitted no later than 18 months prior to the compliance date, and is 
subject to Administrator approval. The Administrator shall determine 
within 120 operating days whether the Emissions Averaging Plan 
submitted presents sufficient information. The Administrator shall 
either approve the Emissions Averaging Plan, request changes, or 
request that the owner or operator submit additional information. Once 
the Administrator receives sufficient information, the Administrator 
shall approve, disapprove, or request changes to the plan within 120 
operating days.
    (ii) Information required. The Emissions Averaging Plan shall 
contain the information listed in paragraphs (e)(4)(ii)(A) through 
(e)(4)(ii)(M) of this section for all emission points included in an 
emissions average.
    (A) The required information shall include the identification of 
all emission points and process back-end operations in the planned 
emissions average and, where applicable, notation of whether each 
storage vessel, continuous front-end process vent, batch front-end 
process vent, aggregate batch vents stream, and process wastewater 
stream is a Group 1 or Group 2 emission point, as defined in 
Sec. 63.482 or as designated under Sec. 63.503(c)(2).
    (B) The required information shall include the projected emission 
debits and credits for each emission point and the sum for the emission 
points involved in the average calculated according to Sec. 63.503. The 
projected credits must be greater than or equal to the projected 
debits, as required under Sec. 63.503(e)(3).
    (C) The required information shall include the specific control 
technology or pollution prevention measure that will be used for each 
emission point included in the average and date of application or 
expected date of application.
    (D) The required information shall include the specific 
identification of each emission point affected by a pollution 
prevention measure. To be considered a pollution prevention measure, 
the criteria in Sec. 63.503(j)(1) must be met. If the same pollution 
prevention measure reduces or eliminates emissions from multiple 
emission points in the average, the owner or operator must identify 
each of these emission points.
    (E) The required information shall include a statement that the 
compliance demonstration, monitoring, inspection, recordkeeping, and 
reporting provisions in Sec. 63.503(m), (n), and (o) that are 
applicable to each emission point in the emissions average will be 
implemented beginning on or before the date of compliance.
    (F) The required information shall include documentation of the 
data listed in paragraphs (e)(4)(ii)(F)(1) through (e)(4)(ii)(F)(5) of 
this section for each storage vessel and continuous front-end process 
vent included in the average.
    (1) The required documentation shall include the values of the 
parameters used to determine whether the emission point is Group 1 or 
Group 2. Where a TRE index value is used for continuous front-end 
process vent group determination, the estimated or measured values of 
the parameters used in the TRE equation in Sec. 63.115(d) of subpart G 
and the resulting TRE index value shall be submitted.
    (2) The required documentation shall include the estimated values 
of all parameters needed for input to the emission debit and credit 
calculations in Sec. 63.503 (g) and (h). These parameter values shall 
be specified in the affected source's Emissions Averaging Plan (or 
operating permit) as enforceable operating conditions. Changes to these 
parameters must be reported in an update to the Emissions Averaging 
Plan, as required by paragraph (e)(4)(iv)(B)(2) of this section.
    (3) The required documentation shall include the estimated percent 
reduction if a control technology achieving a lower percent reduction 
than the efficiency of the applicable reference control technology or 
standard is or will be applied to the emission point.
    (4) The required documentation shall include the anticipated 
nominal efficiency if a control technology achieving a greater percent 
emission reduction than the efficiency of the reference control 
technology is or will be applied to the emission point. The procedures 
in Sec. 63.503(i) shall be followed to apply for a nominal efficiency.
    (5) The required documentation shall include the information 
specified in Sec. 63.120(d)(2)(i) and in either

[[Page 46973]]

Sec. 63.120(d)(2)(ii) or (d)(2)(iii) of subpart G for each storage 
vessel controlled with a closed-vent system using a control device 
other than a flare.
    (G) The information specified in paragraph (f) of this section 
shall be included in the Emissions Averaging Plan for:
    (1) Each continuous front-end process vent controlled by a 
pollution prevention measure or control technique for which monitoring 
parameters or inspection procedures are not specified in Sec. 63.114 of 
subpart G, and
    (2) Each storage vessel controlled by pollution prevention or a 
control technique other than an internal or external floating roof or a 
closed vent system with a control device.
    (H) The required information shall include documentation of the 
data listed in paragraphs (e)(4)(ii)(H)(1) through (e)(4)(ii)(H)(4) of 
this section for each process wastewater stream included in the 
average.
    (1) The required documentation shall include the data used to 
determine whether the wastewater stream is a Group 1 or Group 2 
wastewater stream and the information specified in table 14b of subpart 
G of this part for wastewater streams at new and existing sources.
    (2) The required documentation shall include the estimated values 
of all parameters needed for input to the wastewater emission credit 
and debit calculations in Sec. 63.503(g)(5) and (h)(5). These parameter 
values shall be specified in the affected source's Emissions Averaging 
Plan (or operating permit) as enforceable operating conditions. Changes 
to these parameters must be reported as required by paragraph 
(e)(4)(iv)(B)(2) of this section.
    (3) The required documentation shall include the estimated percent 
reduction if:
    (i) A control technology that achieves an emission reduction less 
than or equal to the emission reduction that would otherwise have been 
achieved by a steam stripper designed to the specifications found in 
Sec. 63.138(g) of subpart G is or will be applied to the wastewater 
stream, or external floating roof or a closed vent system with a 
control device.
    (ii) A control technology achieving less than or equal to 95 
percent emission reduction is or will be applied to the vapor stream(s) 
vented and collected from the treatment processes, or
    (iii) A pollution prevention measure is or will be applied.
    (4) The required documentation shall include the anticipated 
nominal efficiency if the owner or operator plans to apply for a 
nominal efficiency under Sec. 63.503(i). A nominal efficiency shall be 
applied for if:
    (i) A control technology that achieves an emission reduction 
greater than the emission reduction that would have been achieved by a 
steam stripper designed to the specifications found in Sec. 63.138(g) 
of subpart G, is or will be applied to the wastewater stream; or
    (ii) A control technology achieving greater than 95 percent 
emission reduction is or will be applied to the vapor stream(s) vented 
and collected from the treatment processes.
    (I) For each pollution prevention measure, treatment process, or 
control device used to reduce air emissions of organic HAP from 
wastewater and for which no monitoring parameters or inspection 
procedures are specified in Sec. 63.143 of subpart G, the information 
specified in paragraph (f) of this section (Alternative Monitoring 
Parameters) shall be included in the Emissions Averaging Plan.
    (J) The required information shall include documentation of the 
data required by estimated values of all parameters needed for input to 
the emission debit and credit calculations in Sec. 63.503 (g) and (h) 
for each process back-end operation included in an emissions average. 
These values shall be specified in the affected source's Emissions 
Averaging Plan (or operating permit) as enforceable operating 
conditions. Changes to these parameters must be reported as required by 
paragraph (e)(4)(iv)(B)(2) of this section.
    (K) The required information shall include documentation of the 
information required by Sec. 63.503(k). The documentation must 
demonstrate that the emissions from the emission points proposed to be 
included in the average will not result in greater hazard or, at the 
option of the Administrator, greater risk to human health or the 
environment than if the emission points were not included in an 
emissions average.
    (L) The required information shall include documentation of the 
data listed in paragraphs (e)(4)(ii)(L)(1) through (e)(4)(ii)(L)(3) of 
this section for each batch front-end process vent and aggregate batch 
vent stream included in the average.
    (1) The required documentation shall include the values of the 
parameters used to determine whether the emission point is Group 1 or 
Group 2.
    (2) The required information shall include the estimated values of 
all parameters needed for input to the emission debit and credit 
calculations in Sec. 63.503(g) and (h). These parameter values shall be 
specified in the affected source's Emissions Averaging Plan (or 
operating permit) as enforceable operating conditions. Changes to these 
parameters must be reported as required by paragraph (e)(4)(iv) of this 
section.
    (3) For batch front-end process vents, the required documentation 
shall include the estimated percent reduction for the batch cycle. For 
aggregate batch vent streams, the required documentation shall include 
the estimated percent reduction achieved on a continuous basis.
    (M) For each pollution prevention measure or control device used to 
reduce air emissions of organic HAP from batch front-end process vents 
or batch vent streams and for which no monitoring parameters or 
inspection procedures are specified in Sec. 63.489, the information 
specified in paragraph (f) of this section, Alternative Monitoring 
Parameters, shall be included in the Emissions Averaging Plan.
    (iii) Supplement to Emissions Averaging Plan. The owner or operator 
required to prepare an Emissions Averaging Plan under paragraph (e)(4) 
of this section shall also prepare a supplement to the Emissions 
Averaging Plan for any alternative controls or operating scenarios that 
may be used to achieve compliance.
    (iv) Updates to Emissions Averaging Plan. The owner or operator of 
an affected source required to submit an Emissions Averaging Plan under 
paragraph (e)(4) of this section shall also submit written updates of 
the Emissions Averaging Plan to the Administrator for approval under 
the circumstances described in paragraphs (e)(4)(iv)(A) and 
(e)(4)(iv)(B) of this section unless the relevant information has been 
included and submitted in an operating permit application or amendment.
    (A) The owner or operator who plans to make a change listed in 
either paragraph (e)(4)(iv)(A)(1) or (e)(4)(iv)(A)(2) of this section 
shall submit an Emissions Averaging Plan update at least 120 operating 
days prior to making the change.
    (1) An Emissions Averaging Plan update shall be submitted whenever 
an owner or operator elects to achieve compliance with the emissions 
averaging provisions in Sec. 63.503 by using a control technique other 
than that specified in the Emissions Averaging Plan, or plans to 
monitor a different parameter or operate a control device in a manner 
other than that specified in the Emissions Averaging Plan.
    (2) An Emissions Averaging Plan update shall be submitted whenever 
an emission point or an EPPU is added to an existing affected source 
and is

[[Page 46974]]

planned to be included in an emissions average, or whenever an emission 
point not included in the emissions average described in the Emissions 
Averaging Plan is to be added to an emissions average. The information 
in paragraph (e)(4) of this section shall be updated to include the 
additional emission point.
    (B) The owner or operator who has made a change as defined in 
paragraph (e)(4)(iv)(B)(1) or (e)(4)(iv)(B)(2) of this section shall 
submit an Emissions Averaging Plan update within 90 operating days 
after the information regarding the change is known to the affected 
source. The update may be submitted in the next quarterly periodic 
report if the change is made after the date the Notification of 
Compliance Status is due.
    (1) An Emissions Averaging Plan update shall be submitted whenever 
a process change is made such that the group status of any emission 
point in an emissions average changes.
    (2) An Emissions Averaging Plan update shall be submitted whenever 
a value of a parameter in the emission credit or debit equations in 
Sec. 63.503(g) or (h) changes such that it is below the minimum or 
above the maximum established level specified in the Emissions 
Averaging Plan and causes a decrease in the projected credits or an 
increase in the projected debits.
    (C) The Administrator shall approve or request changes to the 
Emissions Averaging Plan update within 120 operating days of receipt of 
sufficient information regarding the change for emission points 
included in emissions averages.
    (5) Notification of Compliance Status. For existing and new 
affected sources, a Notification of Compliance Status shall be 
submitted within 150 operating days after the compliance dates 
specified in Sec. 63.481. The notification shall contain the 
information listed in paragraphs (e)(5)(i) through (e)(5)(vii) of this 
section.
    (i) The results of any emission point group determinations, process 
section applicability determinations, performance tests, inspections, 
continuous monitoring system performance evaluations, any other 
information used to demonstrate compliance, values of monitored 
parameters established during performance tests, and any other 
information required to be included in the Notification of Compliance 
Status under Sec. 63.122 of subpart G for storage vessels, Sec. 63.117 
of subpart G for continuous front-end process vents, Sec. 63.492 for 
batch front-end process vents, Sec. 63.499 for back-end process 
operations, Sec. 63.146 of subpart G for process wastewater, and 
Sec. 63.503 for emission points included in an emissions average. In 
addition, each owner or operator shall comply with paragraphs 
(e)(5)(i)(A) and (e)(5)(i)(B) of this section.
    (A) For performance tests, and group determinations, and process 
section applicability determinations that are based on measurements, 
the Notification of Compliance Status shall include one complete test 
report, as described in paragraph (e)(5)(i)(B) of this section, for 
each test method used for a particular kind of emission point. For 
additional tests performed for the same kind of emission point using 
the same method, the results and any other required information shall 
be submitted, but a complete test report is not required.
    (B) A complete test report shall include a brief process 
description, sampling site description, description of sampling and 
analysis procedures and any modifications to standard procedures, 
quality assurance procedures, record of operating conditions during the 
test, record of preparation of standards, record of calibrations, raw 
data sheets for field sampling, raw data sheets for field and 
laboratory analyses, documentation of calculations, and any other 
information required by the test method.
    (ii) For each monitored parameter for which a maximum or minimum 
level is required to be established under Sec. 63.120(d)(3) of subpart 
G for storage vessels, Sec. 63.485(k) for continuous front-end process 
vents, Sec. 63.489 for batch front-end process vents and aggregate 
batch vent streams, Sec. 63.497 for back-end process operations, 
Sec. 63.143(f) of subpart G for process wastewater, Sec. 63.503(m) for 
emission points in emissions averages, paragraph (e)(8) of this 
section, or paragraph (f) of this section, the information specified in 
paragraphs (e)(5)(ii)(A) through (e)(5)(ii)(E) of this section, unless 
this information has been established and provided in the operating 
permit.
    (A) The required information shall include the specific maximum or 
minimum level of the monitored parameter(s) for each emission point.
    (B) The required information shall include the rationale for the 
specific maximum or minimum level for each parameter for each emission 
point, including any data and calculations used to develop the level 
and a description of why the level indicates proper operation of the 
control device.
    (C) The required information shall include a definition of the 
affected source's operating day, as specified in paragraph (d)(3)(ii) 
of this section, for purposes of determining daily average values of 
monitored parameters.
    (D) For batch front-end process vents, the required information 
shall include a definition of each batch cycle that requires the 
control of one or more batch emission episodes during the cycle, as 
specified in Sec. 63.490(c)(2) and 63.505(b)(3)(ii).
    (E) The required information shall include a definition of the 
affected source's operating month for the purposes of determining 
monthly average values of residual organic HAP.
    (iii) For emission points included in an emissions average, the 
values of all parameters needed for input to the emission credit and 
debit equations in Sec. 63.503 (g) and (h), calculated or measured 
according to the procedures in Sec. 63.503 (g) and (h), and the 
resulting calculation of credits and debits for the first quarter of 
the year. The first quarter begins on the compliance date specified.
    (iv) For batch front-end process vents required to establish a 
batch cycle limitation under Sec. 63.490(f), the owner or operator must 
define the 12-month period over which that source's ``year'' will be 
said to occur, as required by the definition of ``year'' in 
Sec. 63.482.
    (v) The determination of applicability for flexible operation units 
as specified in Sec. 63.480(f)(6).
    (vi) The parameter monitoring levels for flexible operation units, 
and the basis on which these levels were selected, or a demonstration 
that these levels are appropriate at all times, as specified in 
Sec. 63.480(f)(7).
    (vii) The results for each predominant use determination for 
storage vessels belonging to an affected source subject to this subpart 
that is made under Sec. 63.480(g)(6).
    (viii) The results for each predominant use determination for 
recovery operation equipment belonging to an affected source subject to 
this subpart that is made under Sec. 63.480(h)(6).
    (ix) For owners and operators of Group 2 batch front-end process 
vents establishing a batch cycle limitation, as specified in 
Sec. 63.490(f), the affected source's operating year for purposes of 
determining compliance with the batch cycle limitation.
    (6) Periodic Reports. For existing and new affected sources, each 
owner or operator shall submit Periodic Reports as specified in 
paragraphs (e)(6)(i) through (e)(6)(xi) of this section.
    (i) Except as specified in paragraphs (e)(6)(x) and (e)(6)(xi) of 
this section, a report containing the information in paragraph 
(e)(6)(ii) of this section or paragraphs (e)(6)(iii) through (e)(6)(ix) 
of this section, as appropriate, shall be

[[Page 46975]]

submitted semiannually no later than 60 operating days after the end of 
each 180 day period. The first report shall be submitted no later than 
240 days after the date the Notification of Compliance Status is due 
and shall cover the 6-month period beginning on the date the 
Notification of Compliance Status is due. Subsequent reports shall 
cover each preceding 6-month period.
    (ii) If none of the compliance exceptions in paragraphs (e)(6)(iii) 
through (e)(6)(ix) of this section occurred during the 6-month period, 
the Periodic Report required by paragraph (e)(6)(i) of this section 
shall be a statement that the affected source was in compliance for the 
preceding 6-month period and that none of the activities specified in 
paragraphs (e)(6)(iii) through (e)(6)(ix) of this section occurred.
    (iii) For an owner or operator of an affected source complying with 
the provisions of Secs. 63.484 through 63.501 for any emission point, 
Periodic Reports shall include:
    (A) All information specified in Sec. 63.122(a)(4) of subpart G for 
storage vessels, Secs. 63.117(a)(3) and 63.118(f) of subpart G for 
continuous front-end process vents, Sec. 63.492 for batch front-end 
process vents and aggregate batch vent streams, Sec. 63.499 for back-
end process operations, Sec. 63.104(b)(4) of subpart F for heat 
exchange systems, and Sec. 63.146(c) through Sec. 63.146(f) of subpart 
G for process wastewater.
    (B) The daily average values or batch cycle daily average values of 
monitored parameters for all excursions, as defined in Sec. 63.505(g) 
and Sec. 63.505(h).
    (C) The periods when monitoring data were not collected shall be 
specified; and
    (D) The information in paragraphs (e)(6)(iii)(D)(1) through 
(e)(6)(iii)(D)(3) of this section, as applicable:
    (1) Any supplements to the Emissions Averaging Plan, as required in 
paragraph (e)(4)(iii) of this section;
    (2) Notification if a process change is made such that the group 
status of any emission point changes. The information submitted shall 
include a compliance schedule, as specified in paragraphs 
(e)(6)(iii)(D)(2)(i) and (e)(6)(iii)(D)(2)(ii) of this section, for 
emission points that change from Group 2 to Group 1, or for continuous 
front-end process vents under the conditions listed in 
Sec. 63.485(l)(1) through Sec. 63.485(l)(4), or for batch front-end 
process vents under the conditions listed in Sec. 63.492 (b) or (c).
    (i) The owner of operator shall submit to the Administrator for 
approval a compliance schedule and a justification for the schedule.
    (ii) The Administrator shall approve the compliance schedule or 
request changes within 120 operating days of receipt of the compliance 
schedule and justification.
    (3) Notification if one or more emission points or one or more EPPU 
is added to an affected source. The owner or operator shall submit the 
information contained in paragraphs (e)(6)(iii)(D)(3)(i) through 
(e)(6)(iii)(D)(3)(iii) of this section.
    (i) A description of the addition to the affected source;
    (ii) Notification of the group status of the additional emission 
point or all emission points in the EPPU;
    (iii) A compliance schedule, as required under paragraph 
(e)(6)(iii)(D)(2) of this section.
    (4) Notification if a standard operating procedure, as defined in 
Sec. 63.500(l), is changed. This shall also include test results of the 
carbon disulfide concentration resulting from the new standard 
operating procedure.
    (E) The information in paragraph (b)(1)(ii) of this section for 
reports of startup, shutdown, and malfunction.
    (iv) For each batch front-end process vent with a batch cycle 
limitation, the owner or operator shall include the number of batch 
cycles accomplished during the preceding 12-month period once per year 
in a Periodic Report.
    (v) If any performance tests are reported in a Periodic Report, the 
following information shall be included:
    (A) One complete test report shall be submitted for each test 
method used for a particular kind of emission point tested. A complete 
test report shall contain the information specified in paragraph 
(e)(5)(i)(B) of this section.
    (B) For additional tests performed for the same kind of emission 
point using the same method, results and any other information required 
shall be submitted, but a complete test report is not required.
    (vi) The results for each change made to a primary product 
determination for an elastomer product made under Sec. 63.480(f)(6).
    (vii) The results for each change made to a predominant use 
determination for a storage vessel belonging to an affected source 
subject to this subpart that is made under Sec. 63.480(g)(6).
    (viii) The results for each change made to a predominant use 
determination for recovery operation equipment belonging to an affected 
source subject to this subpart that is made under Sec. 63.480(h)(6).
    (ix) The Periodic Report required by Sec. 63.502(i) shall be 
submitted as part of the Periodic Report required by paragraph (e)(6) 
of this section.
    (x) The owner or operator of an affected source shall submit 
quarterly reports for all emission points included in an emissions 
average.
    (A) The quarterly reports shall be submitted no later than 60 
operating days after the end of each quarter. The first report shall be 
submitted with the Notification of Compliance Status no later than 150 
days after the compliance date.
    (B) The quarterly reports shall include the information specified 
in paragraphs (e)(6)(x)(B)(1) through (e)(6)(x)(B)(7) of this section 
for all emission points included in an emissions average.
    (1) The credits and debits calculated each month during the 
quarter;
    (2) A demonstration that debits calculated for the quarter are not 
more than 1.30 times the credits calculated for the quarter, as 
required under Sec. 63.503(e)(4);
    (3) The values of any inputs to the debit and credit equations in 
Sec. 63.503(g) and (h) that change from month to month during the 
quarter or that have changed since the previous quarter;
    (4) Results of any performance tests conducted during the reporting 
period including one complete report for each test method used for a 
particular kind of emission point as described in paragraph (e)(6)(v) 
of this section;
    (5) Reports of daily average values or batch cycle daily averages 
of monitored parameters for excursions as defined in Sec. 63.505(g) or 
(h);
    (6) For excursions caused by lack of monitoring data, the duration 
of periods when monitoring data were not collected shall be specified; 
and
    (7) Any other information the affected source is required to report 
under the operating permit or Emissions Averaging Plan for the affected 
source.
    (C) Sec. 63.505 shall govern the use of monitoring data to 
determine compliance for Group 1 and Group 2 emission points included 
in emissions averages.
    (D) Every fourth quarterly report shall include the following:
    (1) A demonstration that annual credits are greater than or equal 
to annual debits as required by Sec. 63.503(e)(3); and
    (2) A certification of compliance with all the emissions averaging 
provisions in Sec. 63.503.
    (xi) The owner or operator of an affected source shall submit 
quarterly reports for particular emission points and process sections 
not included in an emissions average as specified in paragraphs 
(e)(6)(xi)(A) through (e)(6)(xi)(E) of this section.
    (A) If requested by the Administrator, the owner or operator of an 
affected

[[Page 46976]]

source shall submit quarterly reports for a period of 1 year for an 
emission point or process section that is not included in an emissions 
average if either the conditions in paragraph (e)(6)(xi)(A)(1) or 
(e)(6)(xi)(A)(2) of this section are met.
    (1) An emission point has any excursions, as defined in 
Sec. 63.505(g) or Sec. 63.505(h) for a semiannual reporting period.
    (2) The process section is out of compliance with its applicable 
standard.
    (B) The quarterly reports shall include all information specified 
in paragraphs (e)(6)(iii) and (e)(6)(ix) of this section, as applicable 
to the emission point or process section for which quarterly reporting 
is required under paragraph (e)(6)(ix)(A) of this section. Information 
applicable to other emission points within the affected source shall be 
submitted in the semiannual reports required under paragraph (e)(6)(i) 
of this section.
    (C) Quarterly reports shall be submitted no later than 60 operating 
days after the end of each quarter.
    (D) After quarterly reports have been submitted for an emission 
point for 1 year, the owner or operator may return to semiannual 
reporting for the emission point or process section unless the 
Administrator requests the owner or operator to continue to submit 
quarterly reports.
    (E) Sec. 63.505 shall govern the use of monitoring data to 
determine compliance for Group 1 emission points.
    (7) Other reports. Other reports shall be submitted as specified in 
paragraphs (e)(7)(i) and (e)(7)(ii) of this section.
    (i) For storage vessels, the notifications of inspections required 
by Sec. 63.484 shall be submitted, as specified in Sec. 63.122(h)(1) 
and (h)(2) of subpart G.
    (ii) For owners or operators of affected sources required to 
request approval for a nominal control efficiency for use in 
calculating credits for an emissions average, the information specified 
in Sec. 63.503(i) shall be submitted.
    (iii) For back-end process operations complying using control or 
recovery devices, the recompliance determination report required by 
Sec. 63.499(d) shall be submitted within 180 days after the process 
change.
    (8) Operating Permit. An owner or operator who submits an operating 
permit application instead of an Emissions Averaging Plan or a 
Precompliance Report shall submit the following information with the 
operating permit application:
    (i) The information specified in paragraph (e)(4) of this section 
for points included in an emissions average; and
    (ii) The information specified in paragraph (e)(3) of this section, 
Precompliance Report, as applicable.
    (f) Alternative monitoring parameters. The owner or operator who 
has been directed by any section of this subpart to set unique 
monitoring parameters, or who requests approval to monitor a different 
parameter than those listed in Sec. 63.484 for storage vessels, 
Sec. 63.114 of subpart G for continuous front-end process vents, 
Sec. 63.489 for batch front-end process vents and aggregate batch vent 
streams, Sec. 63.497 for back-end process operations, or Sec. 63.143 of 
subpart G for process wastewater shall submit the information specified 
in paragraphs (f)(1) through (f)(3) of this section in the 
Precompliance Report, as required by paragraph (e)(3) of this section. 
The owner or operator shall retain for a period of 5 years each record 
required by paragraphs (f)(1) through (f)(3) of this section.
    (1) The required information shall include a description of the 
parameter(s) to be monitored to ensure the recovery device, control 
device, or pollution prevention measure is operated in conformance with 
its design and achieves the specified emission limit, percent 
reduction, or nominal efficiency, and an explanation of the criteria 
used to select the parameter(s).
    (2) The required information shall include a description of the 
methods and procedures that will be used to demonstrate that the 
parameter indicates proper operation, the schedule for this 
demonstration, and a statement that the owner or operator will 
establish a level for the monitored parameter as part of the 
Notification of Compliance Status report required in paragraph (e)(5) 
of this section, unless this information has already been included in 
the operating permit application.
    (3) The required information shall include a description of the 
proposed monitoring, recordkeeping, and recording system, to include 
the frequency and content of monitoring, recordkeeping, and reporting. 
Further, the rationale for the proposed monitoring, recordkeeping, and 
reporting system shall be included if either condition in paragraph 
(f)(3)(i) or (f)(3)(ii) of this section are met:
    (i) If monitoring and recordkeeping is not continuous, or
    (ii) If reports of daily average values will not be included in 
Periodic Reports when the monitored parameter value is above the 
maximum level or below the minimum level as established in the 
operating permit or the Notification of Compliance Status.
    (g) Alternative continuous monitoring and recordkeeping. An owner 
or operator choosing not to implement the continuous parameter 
operating and recordkeeping provisions listed in Sec. 63.485 for 
continuous front-end process vents, Sec. 63.486 for batch front-end 
process vents and aggregate batch vent streams, Sec. 63.493 for back-
end process operations, and Sec. 63.501 for wastewater, may instead 
request approval to use alternative continuous monitoring and 
recordkeeping provisions according to the procedures specified in 
paragraphs (g)(1) through (g)(4) of this section. Requests shall be 
submitted in the Precompliance Report as specified in paragraph 
(e)(3)(iv) of this section, if not already included in the operating 
permit application, and shall contain the information specified in 
paragraphs (g)(2)(ii) and (g)(3)(ii) of this section, as applicable.
    (1) The provisions in Sec. 63.8(f)(5)(i) of subpart A shall govern 
the review and approval of requests.
    (2) An owner or operator of an affected source that does not have 
an automated monitoring and recording system capable of measuring 
parameter values at least once every 15 minutes and that does not 
generate continuous records may request approval to use a nonautomated 
system with less frequent monitoring, in accordance with paragraphs 
(g)(2)(i) and (g)(2)(ii) of this section.
    (i) The requested system shall include manual reading and recording 
of the value of the relevant operating parameter no less frequently 
than once per hour. Daily average or batch cycle daily average values 
shall be calculated from these hourly values and recorded.
    (ii) The request shall contain:
    (A) A description of the planned monitoring and recordkeeping 
system;
    (B) Documentation that the affected source does not have an 
automated monitoring and recording system;
    (C) Justification for requesting an alternative monitoring and 
recordkeeping system; and
    (D) Demonstration to the Administrator's satisfaction that the 
proposed monitoring frequency is sufficient to represent control device 
operating conditions, considering typical variability of the specific 
process and control device operating parameter being monitored.
    (3) An owner or operator may request approval to use an automated 
data compression recording system that does not record monitored 
operating parameter values at a set frequency (for example, once every 
15 minutes), but that records all values that meet set criteria for 
variation from previously

[[Page 46977]]

recorded values, in accordance with paragraphs (g)(3)(i) and (g)(3)(ii) 
of this section.
    (i) The requested system shall be designed to:
    (A) Measure the operating parameter value at least once every 15 
minutes;
    (B) Except for the monitoring of batch front-end process vents, 
record at least four values each hour during periods of operation;
    (C) Record the date and time when monitors are turned off or on;
    (D) Recognize unchanging data that may indicate the monitor is not 
functioning properly, alert the operator, and record the incident;
    (E) Calculate daily average or batch cycle daily average values of 
the monitored operating parameter based on all measured data; and
    (F) If the daily average is not an excursion, as defined in 
Sec. 63.505 (g) or (h), the data for that operating day may be 
converted to hourly average values and the four or more individual 
records for each hour in the operating day may be discarded.
    (ii) The request shall contain:
    (A) A description of the monitoring system and data compression 
recording system, including the criteria used to determine which 
monitored values are recorded and retained;
    (B) The method for calculating daily averages and batch cycle daily 
averages; and
    (C) A demonstration that the system meets all criteria in paragraph 
(g)(3)(i) of this section.
    (4) An owner or operator may request approval to use other 
alternative monitoring systems according to the procedures specified in 
Sec. 63.8(f)(4) of subpart A.
    (h) Reduced recordkeeping program. For any parameter with respect 
to any item of equipment, the owner or operator may implement the 
recordkeeping requirements in paragraph (h)(1) or (h)(2) of this 
section as alternatives to the continuous operating parameter 
monitoring and recordkeeping provisions listed in Sec. 63.484 for 
storage vessels, Sec. 63.485 for continuous front-end process vents, 
Sec. 63.486 for batch front-end process vents and aggregate batch vent 
streams, Sec. 63.493 for back-end processes, and Sec. 63.501 for 
wastewater. The owner or operator shall retain for a period of 5 years 
each record required by paragraph (h)(1) or (h)(2) of this section.
    (1) The owner or operator may retain only the daily average or the 
batch cycle daily average value, and is not required to retain more 
frequent monitored operating parameter values, for a monitored 
parameter with respect to an item of equipment, if the requirements of 
paragraphs (h)(1)(i) through (h)(1)(iv) of this section are met. An 
owner or operator electing to comply with the requirements of paragraph 
(h)(1) of this section shall notify the Administrator in the 
Notification of Compliance Status or, if the Notification of Compliance 
Status has already been submitted, in the Periodic Report immediately 
preceding implementation of the requirements of paragraph (h)(1) of 
this section.
    (i) The monitoring system is capable of detecting unrealistic or 
impossible data during periods of operation other than startups, 
shutdowns or malfunctions (e.g., a temperature reading of -200 deg.C on 
a boiler), and will alert the operator by alarm or other means. The 
owner or operator shall record the occurrence. All instances of the 
alarm or other alert in an operating day constitute a single 
occurrence.
    (ii) The monitoring system generates, updated at least hourly 
throughout each operating day, a running average of the monitoring 
values that have been obtained during that operating day, and the 
capability to observe this running average is readily available to the 
Administrator on-site during the operating day. The owner or operator 
shall record the occurrence of any period meeting the criteria in 
paragraphs (h)(1)(ii)(A) through (h)(1)(ii)(C) of this section. All 
instances in an operating day constitute a single occurrence.
    (A) The running average is above the maximum or below the minimum 
established limits;
    (B) The running average is based on at least six one-hour periods; 
and
    (C) The running average reflects a period of operation other than a 
startup, shutdown, or malfunction.
    (iii) The monitoring system is capable of detecting unchanging data 
during periods of operation other than startups, shutdowns or 
malfunctions, except in circumstances where the presence of unchanging 
data is the expected operating condition based on past experience 
(e.g., pH in some scrubbers), and will alert the operator by alarm or 
other means. The owner or operator shall record the occurrence. All 
instances of the alarm or other alert in an operating day constitute a 
single occurrence.
    (iv) The monitoring system will alert the owner or operator by an 
alarm, if the running average parameter value calculated under 
paragraph (h)(1)(ii) of this section reaches a set point that is 
appropriately related to the established limit for the parameter that 
is being monitored.
    (v) The owner or operator shall verify the proper functioning of 
the monitoring system, including its ability to comply with the 
requirements of paragraph (h)(1) of this section, at the times 
specified in paragraphs (h)(1)(v)(A) through (h)(1)(v)(C) of this 
section. The owner or operator shall document that the required 
verifications occurred.
    (A) Upon initial installation.
    (B) Annually after initial installation.
    (C) After any change to the programming or equipment constituting 
the monitoring system, which might reasonably be expected to alter the 
monitoring system's ability to comply with the requirements of this 
section.
    (vi) The owner or operator shall retain the records identified in 
paragraphs (h)(1)(vi)(A) through (h)(1)(vi)(C) of this section.
    (A) Identification of each parameter, for each item of equipment, 
for which the owner or operator has elected to comply with the 
requirements of paragraph (h) of this section.
    (B) A description of the applicable monitoring system(s), and how 
compliance will be achieved with each requirement of paragraphs 
(h)(1)(i) through (h)(1)(v) of this section. The description shall 
identify the location and format (e.g., on-line storage, log entries) 
for each required record. If the description changes, the owner or 
operator shall retain both the current and the most recent superseded 
description.
    (C) A description, and the date, of any change to the monitoring 
system that would reasonably be expected to affect its ability to 
comply with the requirements of paragraph (h)(1) of this section.
    (2) If an owner or operator has elected to implement the 
requirements of paragraph (h)(1) of this section for a monitored 
parameter with respect to an item of equipment and a period of 6 
consecutive months has passed without an excursion as defined in 
paragraph (h)(2)(iv) of this section, the owner or operator is no 
longer required to record the daily average or batch cycle daily 
average value, for any operating day when the daily average or batch 
cycle daily average value is less than the maximum, or greater than the 
minimum established limit. With approval by the Administrator, 
monitoring data generated prior to the compliance date of this subpart 
shall be credited toward the period of 6 consecutive months, if the 
parameter limit and the monitoring accomplished during the period prior 
to the compliance date was required and/or approved by the 
Administrator.
    (i) If the owner or operator elects not to retain the daily average 
or batch cycle

[[Page 46978]]

daily average values, the owner or operator shall notify the 
Administrator in the next Periodic Report. The notification shall 
identify the parameter and unit of equipment.
    (ii) If, on any operating day after the owner or operator has 
ceased recording daily average or batch cycle daily average values as 
provided in paragraph (h)(2) of this section, there is an excursion as 
defined in paragraph (h)(2)(iv) of this section, the owner or operator 
shall immediately resume retaining the daily average or batch cycle 
daily average value for each operating day and shall notify the 
Administrator in the next Periodic Report. The owner or operator shall 
continue to retain each daily average or batch cycle daily average 
value until another period of 6 consecutive months has passed without 
an excursion as defined in paragraph (h)(2)(iv) of this section.
    (iii) The owner or operator shall retain the records specified in 
paragraphs (h)(1)(i), (h)(1)(ii), and (h)(1)(iv) of this section, for 
the duration specified in paragraph (h) of this section. For any 
calendar month, if compliance with paragraphs (h)(1)(i) through 
(h)(1)(iv) of this section does not result in retention of a record of 
at least one occurrence or measured parameter value, the owner or 
operator shall record and retain at least one parameter value during a 
period of operation other than a startup, shutdown, or malfunction.
    (iv) For the purposes of paragraph (h) of this section, an 
excursion means that the daily average or batch cycle daily average 
value of monitoring data for a parameter is greater than the maximum, 
or less than the minimum established value, except as provided in 
paragraphs (h)(2)(iv)(A) and (h)(2)(iv)(B) of this section.
    (A) The daily average or batch cycle daily average value during any 
startup, shutdown, or malfunction shall not be considered an excursion 
for purposes of paragraph (h)(2) of this section, if the owner or 
operator follows the applicable provisions of the startup, shutdown, 
and malfunction plan required by Sec. 63.6(e)(3) of subpart A.
    (B) An excused excursion, as described in Sec. 63.505(i), shall not 
be considered an excursion for the purposes of paragraph (h)(2) of this 
section.

                   Table 1.--Applicability of General Provisions to Subpart U Affected Sources                  
----------------------------------------------------------------------------------------------------------------
              Reference                 Applies to subpart U                        Comment                     
----------------------------------------------------------------------------------------------------------------
63.1(a)(1)...........................  Yes...................  Sec.  63.482 of Subpart U specifies definitions  
                                                                in addition to or that supersede definitions in 
                                                                Sec.  63.2.                                     
63.1(a)(2)-63.1(a)(3)................  Yes                                                                      
63.1(a)(4)...........................  Yes...................  Subpart U (this table) specifies the             
                                                                applicability of each paragraph in subpart A to 
                                                                subpart U.                                      
63.1(a)(5)...........................  No....................  Reserved.                                        
63.1(a)(6)-63.1(a)(8)................  Yes                                                                      
63.1(a)(9)...........................  No....................  Reserved.                                        
63.1(a)(10)..........................  No....................  Subpart U and other cross-referenced subparts    
                                                                specify calendar or operating day.              
63.1(a)(11)..........................  Yes                                                                      
63.1(a)(12)-63.1(a)(14)..............  Yes                                                                      
63.1(b)(1)...........................  Yes...................  Sec.  63.480(a) contains specific applicability  
                                                                criteria.                                       
63.1(b)(2)...........................  Yes                                                                      
63.1(b)(3)...........................  No....................  Sec.  63.480(b) of subpart U provides            
                                                                documentation requirements for EPPUs not        
                                                                considered affected sources.                    
63.1(c)(1)...........................  Yes...................  Subpart U (this table) specifies the             
                                                                applicability of each paragraph in subpart A to 
                                                                subpart U.                                      
63.1(c)(2)...........................  No....................  Area sources are not subject to subpart U.       
63.1(c)(3)...........................  No....................  Reserved.                                        
63.1(c)(4)...........................  Yes                                                                      
63.1(c)(5)...........................  Yes...................  Except that affected sources are not required to 
                                                                submit notifications overridden by this table.  
63.1(d)..............................  No....................  Reserved.                                        
63.1(e)..............................  Yes                                                                      
63.2.................................  Yes...................  Sec.  63.482 of subpart U specifies those subpart
                                                                A definitions that apply to subpart U.          
63.3.................................  Yes                                                                      
63.4(a)(1)-63.4(a)(3)................  Yes                                                                      
63.4(a)(4)...........................  No....................  Reserved.                                        
63.4(a)(5)...........................  Yes                                                                      
63.4(b)..............................  Yes                                                                      
63.4(c)..............................  Yes                                                                      
63.5(a)..............................  Yes                                                                      
63.5(b)(1)...........................  Yes                                                                      
63.5(b)(2)...........................  No....................  Reserved.                                        
63.5(b)(3)...........................  Yes                                                                      
63.5(b)(4)...........................  Yes                                                                      
63.5(b)(5)...........................  Yes                                                                      
63.5(b)(6)...........................  No....................  Sec.  63.480(i) of subpart U specifies           
                                                                requirements.                                   
63.5(c)..............................  No....................  Reserved.                                        
63.5(d)(1)(i)........................  Yes                                                                      
63.5(d)(1)(ii).......................  Yes...................  Except that for affected sources subject to      
                                                                subpart U, emission estimates specified in Sec. 
                                                                63.5(d)(1)(ii)(H) are not required.             
63.5(d)(1)(iii)......................  No....................  Sec.  63.506(e)(5) of subpart U specifies        
                                                                Notification of Compliance Status requirements. 
63.5(d)(2)...........................  xlNo..................                                                   
63.5(d)(3)...........................  Yes...................  Except Sec.  63.5(d)(3)(ii) does not apply.      
63.5(d)(4)...........................  Yes                                                                      
63.5(e)..............................  Yes                                                                      
63.5(f)(1)...........................  Yes                                                                      
63.5(f)(2)...........................  Yes...................  Except that where Sec.  63.5(d)(1) is referred   
                                                                to, Sec.  63.5(d)(1)(i) does not apply.         
63.6(a)..............................  Yes                                                                      
63.6(b)(1)...........................  Yes                                                                      

[[Page 46979]]

                                                                                                                
63.6(b)(2)...........................  Yes                                                                      
63.6(b)(3)...........................  Yes                                                                      
63.6(b)(4)...........................  Yes                                                                      
63.6(b)(5)...........................  Yes                                                                      
63.6(b)(6)...........................  No....................  Reserved.                                        
63.6(b)(7)...........................  Yes                                                                      
63.6(c)(1)...........................  Yes...................  Sec.  63.481 of subpart U specifies the          
                                                                compliance date.                                
63.6(c)(2)...........................  Yes                                                                      
63.6(c)(3)...........................  No....................  Reserved.                                        
63.6(c)(4)...........................  No....................  Reserved.                                        
63.6(c)(5)...........................  Yes                                                                      
63.6(d)..............................  No....................  Reserved.                                        
63.6(e)..............................  Yes...................  Except the plan, and any records or reports of   
                                                                startup, shutdown and malfunction do not apply  
                                                                to Group 2 emission points, unless they are     
                                                                included in an emissions average.               
63.6(f)(1)...........................  Yes                                                                      
63.6(f)(2)...........................  Yes...................  Except that in Sec.  63.6(f)(2)(iii)(D),         
                                                                paragraph 63.7(c) does not apply.               
63.6(f)(3)...........................  Yes...................  Except that Sec.  63.6(f)(2)(iii)(D) is not      
                                                                applicable.                                     
63.6(g)..............................  Yes                                                                      
63.6(h)..............................  No....................  Subpart U does not require opacity and visible   
                                                                emission standards.                             
63.6(i)..............................  Yes...................  Except for Sec.  63.6(i)(15), which is reserved, 
                                                                and except that the requests for extension shall
                                                                be submitted no later than the date on which the
                                                                Precompliance Report is required to be submitted
                                                                in Sec.  63.506(e)(3)(i).                       
63.6(j)..............................  Yes                                                                      
63.7(a)(1)...........................  Yes                                                                      
63.7(a)(2)...........................  No....................  Sec.  63.506(e)(5) of subpart U specifies        
                                                                submittal dates.                                
63.7(a)(3)...........................  Yes                                                                      
63.7(b)..............................  No....................  Sec.  63.504(a)(4) of subpart U specifies        
                                                                notification requirements.                      
63.7(c)..............................  No....................  Except if the owner or operator chooses to submit
                                                                an alternative nonopacity emission standard for 
                                                                approval under Sec.  63.6(g).                   
63.7(d)..............................  Yes                                                                      
63.7(e)..............................  Yes...................  Except that performance tests must be conducted  
                                                                at maximum representative operating conditions. 
                                                                In addition, some of the testing requirements   
                                                                specified in subpart U are not consistent with  
                                                                Sec.  63.7(e)(3).                               
63.7(f)..............................  No....................  Subpart U specifies applicable test methods and  
                                                                provides alternatives.                          
63.7(g)..............................  Yes...................  Except that references to the Notification of    
                                                                Compliance Status report in 63.9(h) of subpart A
                                                                are replaced with the requirements in Sec.      
                                                                63.506(e)(5) of subpart U.                      
63.7(h)..............................  Yes...................  Except Sec.  63.7(h)(4)(ii) is not applicable,   
                                                                since the site-specific test plans in Sec.      
                                                                63.7(c)(3) are not required.                    
63.8(a)(1)...........................  Yes                                                                      
63.8(a)(2)...........................  No                                                                       
63.8(a)(3)...........................  No....................  Reserved.                                        
63.8(a)(4)...........................  Yes                                                                      
63.8(b)(1)...........................  Yes                                                                      
63.8(b)(2)...........................  No....................  Subpart U specifies locations to conduct         
                                                                monitoring.                                     
63.8(b)(3)                                                                                                      
63.8(c)(1)(i)........................  Yes                                                                      
63.8(c)(1)(ii).......................  No                                                                       
63.8(c)(1)(iii)......................  Yes                                                                      
63.8(c)(2)...........................  Yes                                                                      
63.8(c)(3)...........................  Yes                                                                      
63.8(c)(4)...........................  No....................  Sec.  63.505 of subpart U specifies monitoring   
                                                                frequency.                                      
63.8(c)(5)-63.8(c)(8)................  No                                                                       
63.8(d)..............................  No                                                                       
63.8(e)..............................  No                                                                       
63.8(f)(1)-63.8(f)(3)................  Yes                                                                      
63.8(f)(4)(i)........................  No....................  Timeframe for submitting request is specified in 
                                                                Sec.  63.506(f) of subpart U.                   
63.8(f)(4)(ii).......................  No                                                                       
63.8(f)(4)(iii)......................  No                                                                       
63.8(f)(5)(i)........................  Yes                                                                      
63.8(f)(5)(ii).......................  No                                                                       
63.8(f)(5)(iii)......................  Yes                                                                      
63.8(f)(6)...........................  No....................  Subpart U does not require CEM's.                
63.8(g)..............................  No....................  Data reduction procedures specified in Sec.      
                                                                63.506(d) of subpart U.                         
63.9(a)..............................  Yes                                                                      
63.9(b)..............................  No....................  Subpart U does not require an initial            
                                                                notification.                                   
63.9(c)..............................  Yes                                                                      
63.9(d)..............................  Yes                                                                      
63.9(e)..............................  No                                                                       
63.9(f)..............................  No....................  Subpart U does not require opacity and visible   
                                                                emission standards.                             
63.9(g)..............................  No                                                                       
63.9(h)..............................  No....................  Sec.  63.506(e)(5) of subpart U specifies        
                                                                Notification of Compliance Status requirements. 

[[Page 46980]]

                                                                                                                
63.9(i)..............................  Yes                                                                      
63.9(j)..............................  No                                                                       
63.10(a).............................  Yes                                                                      
63.10(b)(1)..........................  Yes                                                                      
63.10(b)(2)..........................  Yes                                                                      
63.10(b)(3)..........................  No....................  Sec.  63.480(b) of subpart U requires            
                                                                documentation of sources that are not affected  
                                                                sources.                                        
63.10(c).............................  No....................  Sec.  63.506 of subpart U specifies recordkeeping
                                                                requirements.                                   
63.10(d)(1)..........................  Yes                                                                      
63.10(d)(2)..........................  No                                                                       
63.10(d)(3)..........................  No....................  Subpart U does not require opacity and visible   
                                                                emission standards.                             
63.10(d)(4)..........................  Yes                                                                      
63.10(d)(5)..........................  Yes...................  Except that reports required by Sec.             
                                                                63.10(d)(5)(i) shall be submitted at the same   
                                                                time as Periodic Reports specified in Sec.      
                                                                63.506(e)(6) of subpart U. The startup,         
                                                                shutdown, and malfunction plan, and any records 
                                                                or reports of startup, shutdown, and malfunction
                                                                do not apply to Group 2 emission points unless  
                                                                they are included in an emissions average.      
63.10(e).............................  No                                                                       
63.10(f).............................  Yes                                                                      
63.10(d)(4)..........................  Yes                                                                      
63.11................................  Yes                                                                      
63.12................................  Yes                                                                      
63.13................................  Yes                                                                      
63.14................................  Yes                                                                      
63.15................................  Yes                                                                      
----------------------------------------------------------------------------------------------------------------


                   Table 2. Applicability of Subparts F, G, & H to Subpart U Affected Sources                   
----------------------------------------------------------------------------------------------------------------
                                 Applies To                                               Applicable section of 
          Reference              subpart U                     Comment                          subpart U       
----------------------------------------------------------------------------------------------------------------
                                                    Subpart F                                                   
----------------------------------------------------------------------------------------------------------------
63.100.......................  No                                                                               
63.101.......................  Yes..........  Several definitions from 63.101 are       63.482                  
                                               incorporated by reference into 63.482.                           
63.102-63.109................  No                                                                               
----------------------------------------------------------------------------------------------------------------
                                                    Subpart G                                                   
----------------------------------------------------------------------------------------------------------------
63.110.......................  No                                                                               
63.111.......................  Yes..........  Several definitions from 63.111 are       63.482                  
                                               incorporated by reference into 63.482.                           
63.112.......................  No                                                                               
63.113-63.118................  Yes..........  With the differences noted in 63.485(b)   63.485                  
                                               through 63.485(k).                                               
63.119-63.123................  Yes..........  With the differences noted in 63.484(c)   63.484                  
                                               through 63.484(q).                                               
63.124-63.125................  No...........  Reserved                                                          
63.126-63.130................  No                                                                               
63.131-63.147................  Yes..........  With the differences noted in             63.501                  
                                               63.501(a)(1) through 63.501(a)(8).                               
63.148.......................  Yes..........  With the differences noted in 63.484(c)   63.484 and 63.501       
                                               through 63.484(q) and 63.501(a)(1)                               
                                               through 63.501(a)(8).                                            
63.149.......................  No...........  Reserved                                                          
63.150(a) through 63.150(f)..  No                                                                               
63.150(g)(1) and 63.150(g)(2)  No                                                                               
63.150(g)(3).................  Yes..........  ........................................  63.503(g)(3)            
63.150(g)(4).................  No                                                                               
63.150(g)(5).................  Yes..........  ........................................  63.503(g)(5)            
63.150(h)(1) and 63.150(h)(2)  No                                                                               
63.150(h)(3).................  Yes..........  ........................................  63.503(h)(3)            
63.150(h)(4).................  No                                                                               
63.150(h)(5).................  Yes..........  ........................................  63.503(h)(5)            
63.150(i) through 63.150(o)..  No                                                                               
63.151-63.152................  No                                                                               
----------------------------------------------------------------------------------------------------------------
                                                    Subpart H                                                   
----------------------------------------------------------------------------------------------------------------
63.160-63.193................  Yes..........  Subpart U affected sources must comply    63.502                  
                                               with all requirements of subpart H.                              
----------------------------------------------------------------------------------------------------------------


[[Page 46981]]



     Table 3.--Group 1 Storage Vessels at Existing Affected Sources     
------------------------------------------------------------------------
                                                   Vapor pressure a     
       Vessel capacity  (cubic meters)               (kilopascals)      
------------------------------------------------------------------------
75  capacity < 151...............  13.1           
151  capacity....................  5.2            
------------------------------------------------------------------------
a Maximum true vapor pressure of total organic HAP at storage           
  temperature.                                                          


            Table 4.--Group 1 Storage Vessels at New Sources            
------------------------------------------------------------------------
                                                   Vapor Pressure a     
       Vessel capacity (cubic meters)                (kilopascals)      
------------------------------------------------------------------------
38  capacity < 151...............   13.1          
151  capacity....................   0.7           
------------------------------------------------------------------------
a Maximum true vapor pressure of total organic HAP at storage           
  temperature.                                                          


                                                   Table 5.--Known Organic HAP From Elastomer Products                                                  
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                             Elastomer Product/Subcategory                                              
  Organic HAP/chemical name   --------------------------------------------------------------------------------------------------------------------------
          (CAS No.)                                                                                                 PBR/                                
                                   BR        EPI        EPR        HBR       HYP       NEO       NBL       NBR      SBRS       PSR       SBL      SBRE  
--------------------------------------------------------------------------------------------------------------------------------------------------------
Acrylonitrile (107131).......  .........  .........  .........  ........  ........  ........                                              
 1,3 Butadiene (106990)......  .........  .........  .........  ........  ........  ........           ........      
Carbon Tetrachloride (56235).  .........  .........  .........  ........                                                                         
Chlorobenzene (108907).......  .........  .........  .........  ........                                                                         
Chloroform (67663)...........  .........  .........  .........  ........                                                                         
Chloroprene (126998).........  .........  .........  .........  ........  ........                                                               
Epichlorohydrin (106898).....  .........                                                                                                         
Ethylbenzene (100414)........      .........  .........  ........  ........  ........  ........  ........  ........  ........             
Ethylene Dichloride (75343)..  .........  .........  .........  ........  ........  ........  ........  ........  ........  ........  ........          
Ethylene Oxide (75218).......  .........      .........  ........  ........  ........  ........  ........  ........                       
Formaldehyde (50000).........  .........  .........  .........  ........  ........  ........  ........  ........  ........                       
Hexane (100543)..............      .........      ........  ........  ........  ........  ........     ........      
Methanol (67561).............      .........  .........  ........  ........  ........  ........  ........                                 
Methyl Chloride (74873)......      .........  .........  ........                                                                         
Propylene Oxide (75569)......  .........                                                                                                         
Styrene (100425).............  .........  .........  .........  ........  ........  ........  ........  ........     ........      
Toluene (108883).............  .........          ........  ........     ........  ........     ........      
Xylenes (1330207)............      .........  .........  ........  ........  ........  ........  ........  ........  ........             
--------------------------------------------------------------------------------------------------------------------------------------------------------
 AAAACAS No. = Chemical Abstract Service Number.                                                                                                        
 BR = Butyl Rubber.                                                                                                                                     
 EPI = Epichlorohydrin Rubber.                                                                                                                          
 EPR = Ethylene Propylene Rubber.                                                                                                                       
 HBR = Halobutyl Rubber.                                                                                                                                
 HYP = Hypalon TM.                                                                                                                                      
 NEO = Neoprene.                                                                                                                                        
 NBL = Nitrile Butadiene Latex.                                                                                                                         
 NBR = Nitrile Butadiene Rubber.                                                                                                                        
 PBR/SBRS = Polybutadiene and Styrene Butadiene Rubber by Solution.                                                                                     
 PSR = Polysulfide Rubber.                                                                                                                              
 SBL = Styrene Butadiene Latex.                                                                                                                         
 SBR = Styrene Butadiene Rubber by Emulsion or Solution.                                                                                                
a Includes mono- and di-ethers of ethylene glycol, diethylene glycol, and triethylene glycol R-(OCH2 CH2)n -OR' where:                                  
 n=1,2, or 3;                                                                                                                                           
 R=alkyl or aryl groups; and                                                                                                                            
 R'=R, H, or groups which, when removed, yield glycol ethers with the structure:                                                                        
 R-(OCH2 CH2)n-OH                                                                                                                                       


      Table 6.--Group 1 Batch Front-End Process Vents--Monitoring,      
                Recordkeeping, and Reporting Requirements               
------------------------------------------------------------------------
                                                      Recordkeeping and 
                                 Parameter to be          reporting     
   Control/recovery device          monitored         requirements for  
                                                    monitored parameters
------------------------------------------------------------------------
Thermal Incinerator.........  Firebox temperature   1. Continuous       
                               a.                    records as         
                                                     specified in Sec.  
                                                     63.491(e)(1) b.    
                                                    2. Record and report
                                                     the average firebox
                                                     temperature        
                                                     measured during the
                                                     performance test-- 
                                                     NCS.c              

[[Page 46982]]

                                                                        
                                                    3. Record the batch 
                                                     cycle daily average
                                                     firebox temperature
                                                     as specified in    
                                                     Sec.  63.491(e)(2).
                                                    4. Report all batch 
                                                     cycle daily average
                                                     temperatures that  
                                                     are below the      
                                                     minimum operating  
                                                     temperature        
                                                     established in the 
                                                     NCS or operating   
                                                     permit and all     
                                                     instances when     
                                                     monitoring data are
                                                     not collected--    
                                                     PR.d,e             
Catalytic Incinerator.......  Temperature upstream  1. Continuous       
                               and downstream of     records as         
                               the catalyst bed.     specified in Sec.  
                                                     63.491(e)(1).b     
                                                    2. Record and report
                                                     the average        
                                                     upstream and       
                                                     downstream         
                                                     temperatures and   
                                                     the average        
                                                     temperature        
                                                     difference across  
                                                     the catalyst bed   
                                                     measured during the
                                                     performance test-- 
                                                     NCS.c              
                                                    3. Record the batch 
                                                     cycle daily average
                                                     upstream           
                                                     temperature and    
                                                     temperature        
                                                     difference across  
                                                     catalyst bed as    
                                                     specified in Sec.  
                                                     63.491(e)(2).      
                                                    4. Report all batch 
                                                     cycle daily average
                                                     upstream           
                                                     temperatures that  
                                                     are below the      
                                                     minimum upstream   
                                                     temperature        
                                                     established in the 
                                                     NCS or operating   
                                                     permit--PR.d,e     
                                                    5. Report all batch 
                                                     cycle daily average
                                                     temperature        
                                                     differences across 
                                                     the catalyst bed   
                                                     that are below the 
                                                     minimum difference 
                                                     established in the 
                                                     NCS or operating   
                                                     permit--PR.d,e     
                                                    6. Report all       
                                                     instances when     
                                                     monitoring data are
                                                     not collected.e    
Boiler or Process Heater      Firebox temperature   1. Continuous       
 with a design heat input      a.                    records as         
 capacity less than 44                               specified in Sec.  
 megawatts and where the                             63.491(e)(1).b     
 batch front-end process                            2. Record and report
 vents or aggregate batch                            the average firebox
 vent streams are not                                temperature        
 introduced with or used as                          measured during the
 the primary fuel.                                   performance test-- 
                                                     NCS.c              
                                                    3. Record the batch 
                                                     cycle daily average
                                                     firebox temperature
                                                     as specified in    
                                                     Sec.  63.491(e)(2).
                                                     d                  
                                                    4. Report all batch 
                                                     cycle daily average
                                                     temperatures that  
                                                     are below the      
                                                     minimum operating  
                                                     temperature        
                                                     established in the 
                                                     NCS or operating   
                                                     permit and all     
                                                     instances when     
                                                     monitoring data are
                                                     not collected--    
                                                     PR.d,e             
Flare.......................  Presence of a flame   1. Hourly records of
                               at the pilot light.   whether the monitor
                                                     was continuously   
                                                     operating during   
                                                     batch emission     
                                                     episodes selected  
                                                     for control and    
                                                     whether the pilot  
                                                     flame was          
                                                     continuously       
                                                     present during each
                                                     hour.              
                                                    2. Record and report
                                                     the presence of a  
                                                     flame at the pilot 
                                                     light over the full
                                                     period of the      
                                                     compliance         
                                                     determination--NCS.
                                                     c                  
                                                    3. Record the times 
                                                     and durations of   
                                                     all periods during 
                                                     batch emission     
                                                     episodes when a    
                                                     pilot flame is     
                                                     absent or the      
                                                     monitor is not     
                                                     operating.         
                                                    4. Report the times 
                                                     and durations of   
                                                     all periods during 
                                                     batch emission     
                                                     episodes selected  
                                                     for control when   
                                                     all pilot flames of
                                                     a flare are absent--
                                                     PR.d               

[[Page 46983]]

                                                                        
Scrubber for halogenated      pH of scrubber        1. Continuous       
 batch front-end process       effluent, and.        records as         
 vents or aggregate batch                            specified in Sec.  
 vent streams (Note:                                 63.491(e)(1).b     
 Controlled by a combustion                         2. Record and report
 device other than a flare).                         the average pH of  
                                                     the scrubber       
                                                     effluent measured  
                                                     during the         
                                                     performance test-- 
                                                     NCS.c              
                                                    3. Record the batch 
                                                     cycle daily average
                                                     pH of the scrubber 
                                                     effluent as        
                                                     specified in Sec.  
                                                     63.491(e)(2).      
                                                    4. Report all batch 
                                                     cycle daily average
                                                     pH values of the   
                                                     scrubber effluent  
                                                     that are below the 
                                                     minimum operating  
                                                     pH established in  
                                                     the NCS or         
                                                     operating permit   
                                                     and all instances  
                                                     when insufficient  
                                                     monitoring data are
                                                     collected--PR.d e  
                              Scrubber liquid flow  1. Continuous       
                               rate.                 records as         
                                                     specified in Sec.  
                                                     63.491(e)(1).b     
                                                    2. Record and report
                                                     the scrubber liquid
                                                     flow rate measured 
                                                     during the         
                                                     performance test-- 
                                                     NCS.c              
                                                    3. Record the batch 
                                                     cycle daily average
                                                     scrubber liquid    
                                                     flow rate as       
                                                     specified in Sec.  
                                                     63.491(e)(2).      
                                                    4. Report all batch 
                                                     cycle daily average
                                                     scrubber liquid    
                                                     flow rates that are
                                                     below the minimum  
                                                     flow rate          
                                                     established in the 
                                                     NCS or operating   
                                                     permit and all     
                                                     instances when     
                                                     insufficient       
                                                     monitoring data are
                                                     collected--PR.d e  
Absorber g..................  Exit temperature of   1. Continuous       
                               the absorbing         records as         
                               liquid, and.          specified in Sec.  
                                                     63.491(e)(1).b     
                                                    2. Record and report
                                                     the average exit   
                                                     temperature of the 
                                                     absorbing liquid   
                                                     measured during the
                                                     performance test-- 
                                                     NCS.c              
                                                    3. Record the batch 
                                                     cycle daily average
                                                     exit temperature of
                                                     the absorbing      
                                                     liquid as specified
                                                     in Sec.            
                                                     63.491(e)(2) for   
                                                     each batch cycle.  
                                                    4. Report all the   
                                                     batch cycle daily  
                                                     average exit       
                                                     temperatures of the
                                                     absorbing liquid   
                                                     that are below the 
                                                     minimum operating  
                                                     temperature        
                                                     established in the 
                                                     NCS or operating   
                                                     permit and all     
                                                     instances when     
                                                     monitoring data are
                                                     not collected--PR.d
                                                     e                  
Absorber f..................  Exit specific         1. Continuous       
                               gravity for the       records as         
                               absorbing liquid.     specified in Sec.  
                                                     63.491(e)(1).b     
                                                    2. Record and report
                                                     the average exit   
                                                     specific gravity   
                                                     measured during the
                                                     performance test-- 
                                                     NCS.               
                                                    3. Record the batch 
                                                     cycle daily average
                                                     exit specific      
                                                     gravity as         
                                                     specified in Sec.  
                                                     63.491(e)(2).      
                                                    4. Report all batch 
                                                     cycle daily average
                                                     exit specific      
                                                     gravity values that
                                                     are below the      
                                                     minimum operating  
                                                     temperature        
                                                     established in the 
                                                     NCS or operating   
                                                     permit and all     
                                                     instances when     
                                                     monitoring data are
                                                     not collected--PR.d
                                                     e                  
Condenser f.................  Exit (product side)   1. Continuous       
                               temperature.          records as         
                                                     specified in Sec.  
                                                     63.491(e)(1).b     
                                                    2. Record and report
                                                     the average exit   
                                                     temperature        
                                                     measured during the
                                                     performance test-- 
                                                     NCS.               
                                                    3. Record the batch 
                                                     cycle daily average
                                                     exit temperature as
                                                     specified in Sec.  
                                                     63.491(e)(2).      
                                                    4. Report all batch 
                                                     cycle daily average
                                                     exit temperatures  
                                                     that are above the 
                                                     maximum operating  
                                                     temperature        
                                                     established in the 
                                                     NCS or operating   
                                                     permit and all     
                                                     instances when     
                                                     monitoring data are
                                                     not collected--    
                                                     PR.d,e             

[[Page 46984]]

                                                                        
Carbon Adsorber f...........  Total regeneration    1. Record of total  
                               stream mass flow      regeneration stream
                               during carbon bed     mass flow for each 
                               regeneration          carbon bed         
                               cycle(s), and.        regeneration cycle.
                                                    2. Record and report
                                                     the total          
                                                     regeneration stream
                                                     mass flow during   
                                                     each carbon bed    
                                                     regeneration cycle 
                                                     during the         
                                                     performance test-- 
                                                     NCS.c              
                                                    3. Report all carbon
                                                     bed regeneration   
                                                     cycles when the    
                                                     total regeneration 
                                                     stream mass flow is
                                                     above the maximum  
                                                     mass flow rate     
                                                     established in the 
                                                     NCS or operating   
                                                     permit--PR.d e     
Carbon Adsorber g...........  Temperature of the    1. Record the       
                               carbon bed after      temperature of the 
                               regeneration and      carbon bed after   
                               within 15 minutes     each regeneration  
                               of completing any     and within 15      
                               cooling cycle(s).     minutes of         
                                                     completing any     
                                                     cooling cycle(s).  
                                                    2. Record and report
                                                     the temperature of 
                                                     the carbon bed     
                                                     after each         
                                                     regeneration and   
                                                     within 15 minutes  
                                                     of completing any  
                                                     cooling cycle(s)   
                                                     measured during the
                                                     performance test-- 
                                                     NCS.c              
                                                    3. Report all carbon
                                                     bed regeneration   
                                                     cycles when the    
                                                     temperature of the 
                                                     carbon bed after   
                                                     regeneration, or   
                                                     within 15 minutes  
                                                     of completing any  
                                                     cooling cycle(s),  
                                                     is above the       
                                                     maximum temperature
                                                     established in the 
                                                     NCS or operating   
                                                     permit--PR.d,e     
All Control Devices.........  Presence of flow      1. Hourly records of
                               diverted to the       whether the flow   
                               atmosphere from the   indicator was      
                               control device or.    operating during   
                                                     batch emission     
                                                     episodes selected  
                                                     for control and    
                                                     whether flow was   
                                                     detected at any    
                                                     time during the    
                                                     hour, as specified 
                                                     in Sec.            
                                                     63.491(e)(3).      
                                                    2. Record and report
                                                     the times and      
                                                     durations of all   
                                                     periods during     
                                                     batch emission     
                                                     episodes selected  
                                                     for control when   
                                                     emissions are      
                                                     diverted through a 
                                                     bypass line or the 
                                                     flow indicator is  
                                                     not operating--PD.d
All Control Devices.........  Monthly inspections   1. Records that     
                               of sealed valves.     monthly inspections
                                                     were performed as  
                                                     specified in Sec.  
                                                     63.491(e)(4)(i).   
                                                    2. Record and report
                                                     all monthly        
                                                     inspections that   
                                                     show the valves are
                                                     not closed or the  
                                                     seal has been      
                                                     changed--PR.d      
Absorber, Condenser, and      Concentration level   1. Continuous       
 Carbon Adsorber (as an        or reading            records as         
 alternative to the above).    indicated by an       specified in Sec.  
                               organic monitoring    63.491(e)(1).b     
                               device at the        2. Record and report
                               outlet of the         the average        
                               recovery device.      concentration level
                                                     or reading measured
                                                     during the         
                                                     performance test-- 
                                                     NCS.               
                                                    3. Record the batch 
                                                     cycle daily average
                                                     concentration level
                                                     or reading as      
                                                     specified in Sec.  
                                                     63.491(e)(2).      
                                                    4. Report all batch 
                                                     cycle daily average
                                                     concentration      
                                                     levels or readings 
                                                     that are above the 
                                                     maximum            
                                                     concentration or   
                                                     reading established
                                                     in the NCS or      
                                                     operating permit   
                                                     and all instances  
                                                     when monitoring    
                                                     data are not       
                                                     collected--PR.d,e  
------------------------------------------------------------------------
a Monitor may be installed in the firebox or in the ductwork immediately
  downstream of the firebox before any substantial heat exchange is     
  encountered.                                                          
b ``Continuous records'' is defined in Sec.  63.111 of subpart G.       
c NCS = Notification of Compliance Status described in Sec.             
  63.506(e)(5).                                                         
d PR = Periodic Reports described in Sec.  63.506(e)(6) of this subpart.
                                                                        
e The periodic reports shall include the duration of periods when       
  monitoring data are not collected as specified in Sec.                
  63.506(e)(6)(iii)(C) of this subpart.                                 
f Alternatively, these devices may comply with the organic monitoring   
  device provisions listed at the end of this table.                    


 Table 7.--Operating Parameters for Which Monitoring Levels Are Required
 To Be Established for Continuous and Batch Front-End Process Vents and 
                      Aggregate Batch Vent Streams                      
------------------------------------------------------------------------
                                                         Established    
   Control/Recovery device      Parameters to be          operating     
                                    monitored           parameter(s)    
------------------------------------------------------------------------
Thermal incinerator.........  Firebox temperature.  Minimum temperature.

[[Page 46985]]

                                                                        
Catalytic incinerator.......  Temperature upstream  Minimum upstream    
                               and downstream of     temperature; and   
                               the catalyst bed.     minimum temperature
                                                     difference across  
                                                     the catalyst bed.  
Boiler or process heater....  Firebox temperature.  Minimum temperature.
Scrubber for halogenated      Ph of scrubber        Minimum pH; and     
 vents.                        effluent; and         minimum flow rate. 
                               scrubber liquid                          
                               flow rate.                               
Absorber....................  Exit temperature of   Minimum temperature;
                               the absorbing         and minimum        
                               liquid; and exit      specific gravity.  
                               specific gravity of                      
                               the absorbing                            
                               liquid.                                  
Condenser...................  Exit temperature....  Maximum temperature.
Carbon absorber.............  Total regeneration    Maximum mass flow;  
                               stream mass flow      and maximum        
                               during carbon bed     temperature.       
                               regeneration cycle;                      
                               and temperature of                       
                               the carbon bed                           
                               after regeneration                       
                               (and within 15                           
                               minutes of                               
                               completing any                           
                               cooling cycle(s)).                       
Other devices (or as an       HAP concentration     Maximum HAP         
 alternate to the above) a.    level or reading at   concentration or   
                               outlet of device.     reading.           
------------------------------------------------------------------------
a Concentration is measured instead of an operating parameter.          


 Table 8.--Summary of Compliance Alternative Requirements for the Back- 
                         End Process Provisions                         
------------------------------------------------------------------------
                                 Parameter to be                        
   Compliance alternative           monitored           Requirements    
------------------------------------------------------------------------
Compliance Using Stripping    Residual organic HAP  (1) If batch        
 Technology, Demonstrated      content in each       stripping is used, 
 through Periodic Sampling     sample of crumb or    at least one       
 [Sec.  63.495(b)].            latex.                representative     
                                                     sample is to be    
                                                     taken from every   
                                                     batch.             
                                                    (2) If continuous   
                                                     stripping is used, 
                                                     at least one       
                                                     representative     
                                                     sample is to be    
                                                     taken each         
                                                     operating day.     
                              Quantity of Material  (1) Acceptable      
                               (weight of latex or   methods of         
                               dry crumb rubber)     determining this   
                               represented by each   quantity are       
                               sample.               production records,
                                                     measurement of     
                                                     stream             
                                                     characteristics,   
                                                     and engineering    
                                                     calculations.      
Compliance Using Stripping    At a minimum,         (1) Establish       
 Technology, Demonstrated      temperature,          stripper operating 
 through Stripper Parameter    pressure, steaming    parameter levels   
 Monitoring [Sec.              rates (for steam      for each grade in  
 63.495(c)].                   strippers), and       accordance with    
                               some parameter that   Sec.  63.505(e).   
                               is indicative of     (2) Continuously    
                               residence time..      monitor stripper   
                                                     operating          
                                                     parameters.        
                                                    (3) If hourly       
                                                     average parameters 
                                                     are outside of the 
                                                     established        
                                                     operating parameter
                                                     levels, a crumb or 
                                                     latex sample shall 
                                                     be taken in        
                                                     accordance with    
                                                     Sec.  63.495(c)(3)(
                                                     ii).               
Determining Compliance Using  Parameters to be      Comply with         
 Control or Recovery Devices   monitored are         requirements listed
 [Sec.  63.496].               described in Table    in Table 3 of      
                               3 of subpart G..      subpart G, except  
                                                     for the            
                                                     requirements for   
                                                     halogenated vent   
                                                     stream scrubbers.  
------------------------------------------------------------------------

[FR Doc. 96-21941 Filed 9-4-96; 8:45 am]
BILLING CODE 6560-50-P