[Federal Register Volume 86, Number 24 (Monday, February 8, 2021)]
[Notices]
[Pages 8618-8622]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-02518]


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ENVIRONMENTAL PROTECTION AGENCY

[EPA-HQ-OAR-2020-0599; FRL-10017-95-OAR]


Notice of Request for Approval of Alternative Means of Emission 
Limitation

AGENCY: Environmental Protection Agency (EPA).

ACTION: Notice and request for comments.

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SUMMARY: This action provides public notice and solicits comment on a 
request by Rohm and Haas Chemicals LLC, a subsidiary of The Dow 
Chemical Company (Dow), under the Clean Air Act (CAA), for an 
alternative means of emission limitation (AMEL) for the Standards of 
Performance for Volatile Organic Liquid Storage Vessels, that would 
apply to a proposed new vinyl acetate bulk storage tank to be used at 
its chemical plant in Kankakee, Illinois.

DATES: Comments must be received on or before March 25, 2021.
    Public hearing: If anyone contacts us requesting a public hearing 
on or before February 16, 2021, the EPA will hold a virtual public 
hearing on February 23, 2021. Please refer to the SUPPLEMENTARY 
INFORMATION section for additional information on the public hearing.

ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-
OAR-2020-0599, by any of the following methods:
     Federal eRulemaking Portal: https://www.regulations.gov/ 
(our preferred method). Follow the online instructions for submitting 
comments.
     Email: [email protected]. Include Docket ID No. EPA-
HQ-OAR-2020-0599 in the subject line of the message.
     Fax: (202) 566-9744. Attention Docket ID No. EPA-HQ-OAR-
2020-0599.

[[Page 8619]]

     Mail: U.S. Environmental Protection Agency, EPA Docket 
Center, Docket ID No. EPA-HQ-OAR-2020-0599, Mail Code 28221T, 1200 
Pennsylvania Avenue NW, Washington, DC 20460.
     Hand Delivery or Courier (by scheduled appointment only): 
EPA Docket Center, WJC West Building, Room 3334, 1301 Constitution 
Avenue NW, Washington, DC 20004. The Docket Center's hours of operation 
are 8:30 a.m.-4:30 p.m., Monday - Friday (except Federal holidays).
    Instructions. All submissions received must include the Docket ID 
No. for this rulemaking. Comments received may be posted without change 
to https://www.regulations.gov/, including any personal information 
provided. For detailed instructions on sending comments and additional 
information on the rulemaking process, see the SUPPLEMENTARY 
INFORMATION section of this document. Out of an abundance of caution 
for members of the public and our staff, the EPA Docket Center and 
Reading Room are closed to the public, with limited exceptions, to 
reduce the risk of transmitting COVID-19. Our Docket Center staff will 
continue to provide remote customer service via email, phone, and 
webform. We encourage the public to submit comments via https://www.regulations.gov/ or email, as there may be a delay in processing 
mail and faxes. Hand deliveries and couriers may be received by 
scheduled appointment only. For further information on EPA Docket 
Center services and the current status, please visit us online at 
https://www.epa.gov/dockets.

FOR FURTHER INFORMATION CONTACT: For questions about this action, 
contact Ms. Angela Carey, Sector Policies and Programs Division (E143-
01), Office of Air Quality Planning and Standards (OAQPS), U.S. 
Environmental Protection Agency, Research Triangle Park, North Carolina 
27711; telephone number: (919) 541-2187; fax number: (919) 541-0516; 
and email address: [email protected].

SUPPLEMENTARY INFORMATION:
    Participation in virtual public hearing. Please note that the EPA 
is deviating from its typical approach for public hearings because the 
President has declared a national emergency. Due to the current Centers 
for Disease Control and Prevention (CDC) recommendations, as well as 
state and local orders for social distancing to limit the spread of 
COVID-19, the EPA cannot hold in-person public meetings at this time.
    To request a virtual public hearing, contact the public hearing 
team at (888) 372-8699 or by email at [email protected]. If 
requested, the virtual hearing will be held on February 23, 2021. The 
hearing will convene at 9:00 a.m. Eastern Time (ET) and will conclude 
at 3:00 p.m. ET. The EPA may close a session 15 minutes after the last 
pre-registered speaker has testified if there are no additional 
speakers. The EPA will announce further details at https://www.epa.gov/stationary-sources-air-pollution/volatile-organic-liquid-storage-vessels-including-petroleum-storage.
    If a public hearing is requested, the EPA will begin pre-
registering speakers for the hearing upon publication of this document 
in the Federal Register. To register to speak at the virtual hearing, 
please use the online registration form available at https://www.epa.gov/stationary-sources-air-pollution/volatile-organic-liquid-storage-vessels-including-petroleum-storage or contact the public 
hearing team at (888) 372-8699 or by email at 
[email protected]. The last day to pre-register to speak at the 
hearing will be February 22, 2021. Prior to the hearing, the EPA will 
post a general agenda that will list pre-registered speakers in 
approximate order at: https://www.epa.gov/stationary-sources-air-pollution/volatile-organic-liquid-storage-vessels-including-petroleum-storage.
    The EPA will make every effort to follow the schedule as closely as 
possible on the day of the hearing; however, please plan for the 
hearing to run either ahead of schedule or behind schedule.
    Each commenter will have 5 minutes to provide oral testimony. The 
EPA encourages commenters to provide the EPA with a copy of their oral 
testimony electronically (via email) by emailing it to Angela Carey, 
email address: [email protected]. The EPA also recommends submitting 
the text of your oral testimony as written comments to the rulemaking 
docket.
    The EPA may ask clarifying questions during the oral presentations 
but will not respond to the presentations at that time. Written 
statements and supporting information submitted during the comment 
period will be considered with the same weight as oral testimony and 
supporting information presented at the public hearing.
    Please note that any updates made to any aspect of the hearing will 
be posted online at https://www.epa.gov/stationary-sources-air-pollution/volatile-organic-liquid-storage-vessels-including-petroleum-storage. While the EPA expects the hearing to go forward as set forth 
above, if requested, please monitor our website or contact the public 
hearing team at (888) 372-8699 or by email at [email protected] 
to determine if there are any updates. The EPA does not intend to 
publish a document in the Federal Register announcing updates.
    If you require the services of a translator or a special 
accommodation such as audio description, please pre-register for the 
hearing with the public hearing team at (888) 372-8699 or by email at 
[email protected] and describe your needs by February 16, 2021. 
The EPA may not be able to arrange accommodations without advance 
notice.
    Docket. The EPA has established a docket for this rulemaking under 
Docket ID No. EPA-HQ-OAR-2020-0599. All documents in the docket are 
listed in Regulations.gov. Although listed, some information is not 
publicly available, e.g., Confidential Business Information (CBI) or 
other information whose disclosure is restricted by statute. Certain 
other material, such as copyrighted material, is not placed on the 
internet and will be publicly available only in hard copy. With the 
exception of such material, publicly available docket materials are 
available electronically in Regulations.gov.
    Instructions. Direct your comments to Docket ID No. EPA-HQ-OAR-
2020-0599. The EPA's policy is that all comments received will be 
included in the public docket without change and may be made available 
online at https://www.regulations.gov/, including any personal 
information provided, unless the comment includes information claimed 
to be CBI or other information whose disclosure is restricted by 
statute. Do not submit electronically any information you consider to 
be CBI or other information whose disclosure is restricted by statue. 
This type of information should be submitted by mail as discussed 
below.
    The EPA may publish any comment received to its public docket. 
Multimedia submissions (audio, video, etc.) must be accompanied by a 
written comment. The written comment is considered the official comment 
and should include discussion of all points you wish to make. The EPA 
will generally not consider comments or comment contents located 
outside of the primary submission (i.e., on the Web, cloud, or other 
file sharing system). For additional submission methods, the full EPA 
public comment policy, information about CBI or multimedia submissions, 
and general guidance on making effective comments, please visit

[[Page 8620]]

https://www.epa.gov/dockets/commenting-epa-dockets.
    The https://www.regulations.gov/ website allows you to submit your 
comment anonymously, which means the EPA will not know your identity or 
contact information unless you provide it in the body of your comment. 
If you send an email comment directly to the EPA without going through 
https://www.regulations.gov/, your email address will be automatically 
captured and included as part of the comment that is placed in the 
public docket and made available on the internet. If you submit an 
electronic comment, the EPA recommends that you include your name and 
other contact information in the body of your comment and with any 
digital storage media you submit. If the EPA cannot read your comment 
due to technical difficulties and cannot contact you for clarification, 
the EPA may not be able to consider your comment. Electronic files 
should not include special characters or any form of encryption and be 
free of any defects or viruses. For additional information about the 
EPA's public docket, visit the EPA Docket Center homepage at https://www.epa.gov/dockets.
    The EPA is temporarily suspending its Docket Center and Reading 
Room for public visitors, with limited exceptions, to reduce the risk 
of transmitting COVID-19. Our Docket Center staff will continue to 
provide remote customer service via email, phone, and webform. We 
encourage the public to submit comments via https://www.regulations.gov/ as there may be a delay in processing mail and 
faxes. Hand deliveries or couriers will be received by scheduled 
appointment only. For further information and updates on EPA Docket 
Center services, please visit us online at https://www.epa.gov/dockets.
    The EPA continues to carefully and continuously monitor information 
from the CDC, local area health departments, and our Federal partners 
so that we can respond rapidly as conditions change regarding COVID-19.
    Submitting CBI. Do not submit information containing CBI to the EPA 
through https://www.regulations.gov/ or email. Clearly mark the part or 
all of the information that you claim to be CBI. For CBI information on 
any digital storage media that you mail to the EPA, mark the outside of 
the digital storage media as CBI and then identify electronically 
within the digital storage media the specific information that is 
claimed as CBI. In addition to one complete version of the comments 
that includes information claimed as CBI, you must submit a copy of the 
comments that does not contain the information claimed as CBI directly 
to the public docket through the procedures outlined in Instructions 
above. If you submit any digital storage media that does not contain 
CBI, mark the outside of the digital storage media clearly that it does 
not contain CBI. Information not marked as CBI will be included in the 
public docket and the EPA's electronic public docket without prior 
notice. Information marked as CBI will not be disclosed except in 
accordance with procedures set forth in 40 Code of Federal Regulations 
(CFR) part 2. Send or deliver information identified as CBI only to the 
following address: OAQPS Document Control Officer (C404-02), OAQPS, 
U.S. Environmental Protection Agency, Research Triangle Park, North 
Carolina 27711, Attention Docket ID No. EPA-HQ-OAR-2020-0599. Note that 
written comments containing CBI and submitted by mail may be delayed 
and no hand deliveries will be accepted.
    Acronyms and abbreviations. We use multiple acronyms and terms in 
this document. While this list may not be exhaustive, to ease the 
reading of this document and for reference purposes, the EPA defines 
the following terms and acronyms here:

AMEL alternative means of emission limitation
CAA Clean Air Act
CBI Confidential Business Information
CFR Code of Federal Regulations
EPA Environmental Protection Agency
HAP hazardous air pollutant(s)
MTVP maximum true vapor pressure
NESHAP national emission standards for hazardous air pollutants
NSPS new source performance standards
OAQPS Office of Air Quality Planning and Standards
PRD pressure relief device
PRV pressure relief valve
scf standard cubic feet
VAM vinyl acetate monomer
VOC volatile organic compound(s)

    Organization of this document. The information in this document is 
organized as follows:

I. Background
II. Request for AMEL
III. AMEL for the Rohm and Haas Chemicals LLC facility
IV. Request for Comments

I. Background

    Rohm and Haas is requesting an AMEL for the Standards of 
Performance for Volatile Organic Liquid Storage Vessels, 40 CFR part 
60, subpart Kb (40 CFR 60.112b), that would apply to a proposed new 
vinyl acetate bulk storage tank to be used at its chemical plant in 
Kankakee, Illinois. In this Federal Register document, the EPA is 
soliciting comment on all aspects of this AMEL request, including the 
corresponding operating conditions that would demonstrate that the 
requested AMEL would achieve a reduction in emissions of volatile 
organic compounds (VOC) at least equivalent to the reduction in 
emissions required by the new source performance standards (NSPS) at 40 
CFR 60.112b. The AMEL request states that a new storage tank will be 
installed at the site to replace the existing vinyl acetate monomer 
(VAM) (CAS 108-05-4) tank (TK-72). Such tank functions as a buffer for 
the facility's manufacturing needs between bulk deliveries of VAM. The 
facility receives VAM predominantly by railcar, but occasionally some 
VAM is supplied via tank truck. Due to the facility's demand for VAM, 
the tank experiences a significant number of turnovers per year.
    Because the new storage tank will be used to store VAM, a volatile 
organic liquid as defined at 40 CFR 60.111b, it is subject to NSPS 
subpart Kb. Rohm and Haas is submitting this AMEL request because the 
proposed tank design does not contain either an external or internal 
floating roof or a closed vent system and control device that are 
specified by 40 CFR 60.112b; rather, it is designed to reduce emissions 
through vapor balancing and pressure containment. Rohm and Haas states 
that breathing losses will not occur from the proposed new tank because 
there are no vents and the tank can withstand pressures up to 9 pounds 
per square inch gauge (psig) before activation of a pressure relief 
device (PRD). Rohm and Haas further states that the proposed system 
will control emissions from working losses by complying with the 
requirements associated with the use of a vapor balancing system in the 
National Emission Standards for Organic Hazardous Air Pollutants 
(NESHAP) from the Synthetic Organic Chemical Manufacturing Industry for 
Process Vents, Storage Vessels, Transfer Operations, and Wastewater, 40 
CFR part 63, subpart G.\1\
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    \1\ Rohm and Haas states in its application that ``[c]ompliance 
with 40 CFR 119(g) will address both working losses and breathing 
losses from this tank.'' Rohm and Haas letter at 1. To the extent 
that Rohm and Haas is suggesting 40 CFR 119(g) addresses breathing 
losses, we disagree; rather, as discussed in the prior sentence, 
breathing losses are addressed through pressure containment.
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    The VOC standards at 40 CFR 60.112b were established as work 
practice standards pursuant to CAA section 111(h)(1). For standards 
established according to that provision, CAA section 111(h)(3) allows 
the EPA to

[[Page 8621]]

permit the use of an AMEL by a source if, after notice and opportunity 
for public hearing, it is established to the Administrator's 
satisfaction that such AMEL will achieve emissions reductions at least 
equivalent to the reductions required under the applicable CAA section 
111(h)(1) standards. NSPS subpart Kb also includes specific regulatory 
provisions (i.e., 40 CFR 114b) allowing sources to request an AMEL for 
the VOC standards at 40 CFR 112b.
    Rohm and Haas included in its AMEL application information to 
demonstrate that the proposed bulk storage tank, through its vapor 
balancing system and pressure containment design, will achieve a 
reduction in emissions at least equivalent to the reduction in 
emissions achieved by the VOC standards at 40 CFR 60.112b. Rohm and 
Haas's AMEL request was submitted on June 17, 2020. For Rohm and Haas's 
AMEL request, including any supporting materials Rohm and Haas 
submitted, see Docket ID No. EPA-HQ-OAR-2020-0599.

II. Request for AMEL

    Pursuant to 40 CFR 60.114b, Rohm and Haas is seeking an AMEL for 
the VOC standards set forth at 40 CFR 60.112b for a proposed bulk 
storage tank to be used at its chemical plant in Kankakee, Illinois. 
Rohm and Haas's application includes an engineering evaluation to 
support its request, as required by 40 CFR 60.114b(c).\2\ We, 
therefore, deem this AMEL application by Rohm and Haas to be complete. 
Rohm and Haas submitted this AMEL request because the proposed tank 
design does not contain either an external or internal floating roof or 
a closed vent system and control device that are specified by 40 CFR 
60.112b. Rohm and Haas is proposing an alternative tank design that 
will eliminate breathing losses by storing material in a pressure tank 
and control working losses using vapor balancing.
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    \2\ As explained in the preamble to the proposed NSPS subpart 
Kb, equivalence ``could be demonstrated by a number of methods 
including: (1) An actual emissions test that uses a full size or 
scale-model storage vessel that accurately collects and measures all 
VOC emissions from the storage vessel, or (2) an engineering 
evaluation as approved by the Administrator.'' (Emphasis added). 49 
FR 29698, 29706 (July 23, 1984).
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    The information provided by Rohm and Haas states that the proposed 
new tank is an American Petroleum Institute (API)-620, 160,000 gallon 
(approximately 600 cubic meter) fixed-roof storage tank used for the 
storage of VAM. An API-620 specification tank is designed to contain 
pressures up to 15 psig. According to Rohm and Haas, breathing losses 
will not occur because there are no vents, and the tank can withstand 
pressures up to 9 psig before activation of a PRD. Rohm and Haas's 
engineering evaluation indicates the tank is not expected to exceed 
these pressures. The published vapor pressure of VAM is 1.72 pounds per 
square inch (psi) (89.1 millimeters of mercury) at 68 degrees 
Fahrenheit ([deg]F); however, the EPA defines the maximum true vapor 
pressure (MTVP) as the vapor pressure of a specific material at the 
maximum average monthly temperature, which is 74.7 [deg]F and occurs 
during the month of July in the Kankakee locale. At the specified 
maximum temperature, using the Antoine equation and appropriate 
coefficients, the MTVP of vinyl acetate was estimated to be 2.09 psi, 
which is well below the 9 psig rupture disk and PRD settings for the 
proposed tank. Therefore, PRDs will be designed to open only in 
emergency instances (i.e., external fire or uncontrolled 
polymerization).
    The PRDs will consist of two pressure relief assemblies. The 
primary assembly will include in series a rupture disk, a pressure 
indicator, and a pressure relief valve (PRV). The rupture disk and PRV 
will both be set at 9 psig. The purpose of this assembly is to provide 
early controlled remediation in case of fire/polymerization/over-
pressurization. Because the PRV is downstream of the rupture disk, the 
design will allow the assembly to return to its closed position once 
the pressure release event ends. The secondary pressure relief assembly 
will consist of a rupture disk set at 13 psig, followed by a pressure 
indicator. This assembly is designed to contain extreme fire/
polymerization in the event the first assembly is unable to do so. In 
such event, the rupture disk will vent to protect against vessel 
rupture.
    To demonstrate that the PRV does not open, the tank vapor space 
pressure and the space between the rupture disk and PRV will be 
continuously monitored for pressure and recorded. If a release occurs, 
a new rupture disk will be installed, and the corresponding PRV will be 
reseated properly. This PRV will be checked quarterly to ensure the PRV 
is seated properly using EPA Method 21 following 40 CFR 
63.119(g)(5)(i), part of the vapor balancing provisions in NESHAP 
subpart G (40 CFR 63.119(g)). In the event that a PRV opens, this would 
qualify as an excess emission event and must be reported on the 
semiannual compliance report. If designed and operated as described 
above, there will not be any emission events, therefore, this 
alternative is equivalent with the standard.
    No PRD on the storage tank, railcar, or tank truck is expected to 
open during loading or as a result of diurnal temperature changes 
(breathing losses). During filling of the tank, any displaced vapors 
will be collected and routed through the vapor balancing line. There 
are no PRDs associated with the vapor balancing line itself, and the 
PRDs on the railcar are set at 165 psig and tank trucks are set between 
25 to 50 psig to prevent an opening of a PRD while the vessel is being 
unloaded.
    The tank will also be equipped with a vacuum relief system that 
will be used when VAM is transferred to the process area, and both the 
vacuum relief system and a vapor balance system will be used when VAM 
is added to the tank. The vacuum relief system only serves to allow 
ambient air into the tank's head space to equalize pressure decreases 
as material is removed. The vapor balance system operation collects and 
contains vapors discharged during tank filling operations.
    In its request, Rohm and Haas states that the proposed tank would 
comply with the vapor balancing requirements in NESHAP subpart G, 40 
CFR 63.119(g) to confirm proper vapor balancing.
    The facility unloads VAM from tank trucks or railcars, which are 
connected to the tank system's vapor balance system. The Kankakee 
facility's bulk unloading Standard Operating Procedure requires that 
each U.S. Department of Transportation (DOT)-specification tank truck 
or railcar containing vinyl acetate be inspected to verify that its DOT 
qualification inspections and tests are current. VAM will be unloaded 
only from tank trucks or railcars which are connected to the tank 
system's vapor balance system.
    The site will require that railcars and tank trucks that deliver 
VAM will be reloaded or cleaned only at facilities which utilize the 
control techniques specified at 40 CFR 63.119(g)(6)(i) or (ii) of 
NESHAP subpart G. The site will mandate that each railcar or tank truck 
is connected to a closed-vent system with a control device that reduces 
inlet emissions of HAP by 95 percent by weight or greater.
    The Kankakee facility will request, maintain, and submit to the 
Administrator a written certification from the VAM supplier that each 
supplier's current reloading or cleaning facility meets the above 
requirements. If the supplier(s) of the VAM changes in the future, the 
Kankakee facility will obtain a written certification that the new 
supplier(s) meet these requirements.
    Rohm and Haas believes that this tank, as designed and operated, 
will

[[Page 8622]]

result in a reduction in emissions equivalent to or better than the 
amount achieved by the VOC standards set forth in 40 CFR 60.112b of 
NSPS subpart Kb. Rohm and Haas, therefore, asks that the EPA approve 
this AMEL request.

III. AMEL for the Rohm and Haas Chemicals LLC Facility

    Based upon our review of the AMEL request, we believe that, by 
complying with the operating conditions specified below, the proposed 
new tank at Dow's Rohm and Haas Chemicals LLC facility will achieve 
emission reductions at least equivalent to reduction in emissions 
required by NSPS subpart Kb, 40 CFR 60.112b. We are seeking the 
public's input on this request. Specifically, the EPA seeks the 
public's input on the conditions specified in this document in the 
following paragraphs.
    (1) No PRD on the storage tank, or on the railcar or tank truck, 
shall open during loading or as a result of diurnal temperature changes 
(breathing losses).
    (2) Both PRDs on the storage tank must be set to release at no less 
than 9 psig at all times. Any release from a PRD as indicated by 
pressure reading greater than 9 psig is an excess emissions event. To 
demonstrate that the PRD does not open, the tank vapor space pressure 
and the space between the rupture disk and PRD will be continuously 
monitored for pressure and recorded. If a release occurs, the tank must 
follow 40 CFR 63.165(d)(2).
    (3) Each of the PRDs and components of the vapor collection system 
on the tank must be monitored on a quarterly basis, using EPA Method 
21. An instrument reading of 500 parts per million by volume or greater 
is an excess emissions event.
    (4) VAM must be transferred from either railcars or truck trailers 
via welded steel piping into the new bulk storage tank. The tank must 
be equipped with a welded steel vapor balance line that returns 
displaced vinyl acetate vapors from the headspace within the tank to 
the railcar or tank truck during tank filling operations. The vapor 
balance line must be hard piped from the tank, crossing a pipe bridge, 
before terminating at the off-loading station. The tank vapor balance 
line must not contain any PRDs or release points. Displaced vapors must 
be transferred to a vapor return fitting on the offloading bulk vehicle 
through a hose from the offloading station. Both the transfer hoses and 
the vapor balance return line must incorporate dry-disconnect fittings 
to prevent vapor discharge to the atmosphere when the line is not 
connected. Tank trucks and railcars must have a current certification 
in accordance with the DOT pressure test requirements of 49 CFR part 
180 for tank trucks and 49 CFR 173.31 for railcars. Railcars, tank 
trucks, or barges that deliver VAM to a storage tank must be reloaded 
or cleaned at a facility that utilizes the control techniques specified 
in paragraph (4)(a) or (b).
    (a) The railcar, tank truck, or barge must be connected to a 
closed-vent system with a control device that reduces inlet emissions 
of VAM by 95 percent by weight or greater.
    (b) A vapor balancing system designed and operated to collect 
organic VAM vapor displaced from the tank truck or railcar during 
reloading must be used to route the collected HAP vapor to the storage 
tank from which the liquid being transferred originated.
    (5) Rohm and Haas must submit to the Administrator a written 
certification that the reloading or cleaning facility meets the 
requirements of paragraph 4; and the requirements for closed vent 
system and control device specified at 40 CFR 63.119 through 63.123. 
The notification and reporting requirements at 40 CFR 63.122 do not 
apply to the owner or operator of the offsite cleaning or reloading 
facility.
    (6) Recordkeeping requirements.
    (a) The facility must keep a record of the equipment to be used and 
the procedures to be followed when reloading the railcar, tank truck, 
or barge and displacing vapors to the storage tank from which the 
liquid originates, as well as a record of all components of the PRDs, 
including PRVs and rupture disks.
    (b) Records must be kept as long as the storage vessel is in 
operation.
    (7) Reporting requirements. The facility must submit excess 
emissions and monitoring systems performance reports to the 
Administrator semiannually. All reports must be postmarked by the 30th 
day following the end of each 6-month period. Written reports of excess 
emissions must include the following information:
    (a) The date and time of commencement and completion of each time 
period of excess emissions. The process operating time during the 
reporting period.
    (b) The date and time identifying each period during which the 
continuous monitoring system was inoperative except for zero and span 
checks and the nature of the system repairs or adjustments.
    (c) The report must include a list of the affected sources or 
equipment, an estimate of the volume of VAM emitted, and a description 
of the method used to estimate the emissions.
    (d) When the continuous pressure monitoring systems have not been 
inoperative, repaired, or adjusted, such information shall be stated in 
the report.

IV. Request for Comments

    We solicit comments on all aspects of Rohm and Haas's requests for 
approval of an AMEL for these new requirements to be used to comply 
with the applicable standards. We specifically seek comment regarding 
whether or not the operating requirements listed in section III above 
will achieve emission reductions at least equivalent to emissions being 
controlled by complying with the applicable requirements in the 40 CFR 
part 60, subpart Kb, Standards of Performance for Volatile Organic 
Liquid Storage Vessels requirements in 40 CFR 60.112b.

    Dated: December 8, 2020.
Panagiotis Tsirigotis,
Director, Office of Air Quality Planning and Standards.
[FR Doc. 2021-02518 Filed 2-5-21; 8:45 am]
BILLING CODE 6560-50-P