[Federal Register Volume 71, Number 174 (Friday, September 8, 2006)]
[Proposed Rules]
[Pages 53272-53293]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 06-7493]



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Part III





Environmental Protection Agency





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40 CFR Parts 60, 62, and 63



Standards of Performance, Emission Guidelines, and Federal Plan for 
Municipal Solid Waste Landfills and National Emission Standards for 
Hazardous Air Pollutants; Municipal Solid Waste Landfills; Proposed 
Rule

  Federal Register / Vol. 71, No. 174 / Friday, September 8, 2006 / 
Proposed Rules  

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Parts 60, 62, and 63

[EPA-HQ-OAR-2003-0215; FRL-8217-6]
RIN 2060-AJ41 and A2060-AH13


Standards of Performance, Emission Guidelines, and Federal Plan 
for Municipal Solid Waste Landfills and National Emission Standards for 
Hazardous Air Pollutants: Municipal Solid Waste Landfills

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule; amendments.

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SUMMARY: EPA is proposing amendments to the ``Standards of Performance 
for Municipal Solid Waste Landfills'' (Landfills NSPS), to the 
``Emission Guidelines and Compliance Times for Municipal Solid Waste 
Landfills'' (landfills emission guidelines), to the ``National Emission 
Standards for Hazardous Air Pollutants: Municipal Solid Waste 
Landfills'' (Landfills NESHAP), and to the ``Federal Plan Requirements 
for Municipal Solid Waste Landfills that Commenced Construction Prior 
to May 30, 1991 and Have Not Been Modified or Reconstructed since May 
30, 1991'' (landfills Federal plan). The proposed amendments to the 
Landfills NSPS are supplemental amendments to those proposed on May 23, 
2002. Based on public comments on the proposed amendments and 
additional analysis, we are proposing supplemental amendments to the 
Landfills NSPS to clarify what constitutes treated landfill gas. We are 
also proposing amendments to the Landfills NSPS, emission guidelines, 
Federal plan, and Landfills NESHAP to clarify who is responsible for 
compliance activities where multiple parties are involved in the 
ownership or operation of a landfill and the associated landfill gas 
collection, control, and/or treatment systems. In addition, we are 
proposing revisions to both the Landfills NSPS and the Landfills NESHAP 
regarding startup, shutdown, malfunction, and routine maintenance.
    The proposed amendments to the Landfills NSPS would also serve to 
amend the emission guidelines and the Federal plan for existing 
municipal solid waste landfills because these rules incorporate the 
provisions of the ``Standards of Performance for Municipal Solid Waste 
Landfills.'' We are proposing changes to the emission guidelines and 
Federal plan themselves to reflect the proposed changes to the 
Landfills NSPS where these rules did not directly incorporate the 
provisions of the Landfills NSPS.

DATES: Comments must be received on or before November 7, 2006.
    Public Hearing. If anyone contacts EPA by September 28, 2006 
requesting to speak at a public hearing, EPA will hold a public hearing 
on October 10, 2006. If you are interested in attending the public 
hearing, contact Karen Rackley at (919) 541-0634 to verify that a 
hearing will be held.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
OAR-2003-0215, by one of the following methods:
     www.regulations.gov. Follow the on-line instructions for 
submitting comments.
     E-mail: Send your comments via electronic mail to [email protected], Attention Docket ID No. EPA-HQ-OAR-2003-0215.
     Fax: Fax your comments to (202) 566-1741, Attention Docket 
ID No. EPA-HQ-OAR-2003-0215.
     Mail: By U.S. Postal Service, send your comments to: EPA 
Docket Center (EPA/DC), Environmental Protection Agency, Mail Code 
6102T, 1200 Pennsylvania Ave., NW., Washington, DC 20460, Attention 
Docket ID No. EPA-HQ-OAR-2003-0215. Please include a total of two 
copies. The EPA requests a separate copy also be sent to the contact 
person identified below (see FOR FURTHER INFORMATION CONTACT).
     Hand Delivery: In person or by courier, deliver your 
comments to: EPA Docket Center (EPA/DC), EPA West Building, Room B-108, 
1301 Constitution Ave., NW., Washington, DC 20004, Attention Docket ID 
No. EPA-HQ-OAR-2003-0215. Such deliveries are accepted only during the 
normal hours of operation (8:30 a.m. to 4:30 p.m., Monday through 
Friday, excluding legal holidays), and special arrangements should be 
made for deliveries of boxed information.

    Note: The EPA Docket Center suffered damage due to flooding 
during the last week of June 2006. The Docket Center is continuing 
to operate. However, during the cleanup, there will be temporary 
changes to Docket Center telephone numbers, addresses, and hours of 
operation for people who wish to make hand deliveries or visit the 
Public Reading Room to view documents. Consult EPA's Federal 
Register notice at 71 FR 38147 (July 5, 2006), or the EPA Web site 
at http://www.epa.gov/epahome/dockets.htm for current information on 
docket operations, locations, and telephone numbers. The Docket 
Center's mailing address for U.S. mail and the procedure for 
submitting comments to www.regulations.gov are not affected by the 
flooding and will remain the same.

    Instructions: Direct your comments to Docket ID No. EPA-HQ-OAR-
2003-0215. EPA's policy is that all comments received will be included 
in the public docket without change and may be made available online at 
www.regulations.gov, including any personal information provided, 
unless the comment includes information claimed to be Confidential 
Business Information (CBI) or other information whose disclosure is 
restricted by statute. Do not submit information that you consider to 
be CBI or otherwise protected through www.regulations.gov or e-mail. 
The www.regulations.gov Web site is an ``anonymous access'' system, 
which means EPA will not know your identity or contact information 
unless you provide it in the body of your comment. If you send an e-
mail comment directly to EPA without going through www.regulations.gov, 
your e-mail 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, EPA recommends 
that you include your name and other contact information in the body of 
your comment and with any disk or CD-ROM you submit. If EPA cannot read 
your comment due to technical difficulties and cannot contact you for 
clarification, EPA may not be able to consider your comment. Electronic 
files should avoid the use of special characters, any form of 
encryption, and be free of any defects or viruses. For additional 
information about EPA's public docket, visit the EPA Docket Center 
homepage at http://www.epa.gov/epahome/dockets.htm.
    Public Hearing: If a public hearing is held, it will be held at the 
EPA Facility Complex located at 109 T.W. Alexander Drive, Research 
Triangle Park, NC, or an alternate site nearby.
    Docket: All documents in the docket are listed in the 
www.regulations.gov index. Although listed in the index, some 
information is not publicly available, i.e., 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 form. Publicly available docket 
materials are available either electronically in www.regulations.gov or 
in hard copy at the EPA Docket Center (EPA/DC), EPA West Building, Room 
B-102, 1301 Constitution Ave., NW., Washington, DC. The Public Reading 
Room is open from 8:30 a.m. to 4:30 p.m., Monday through Friday, 
excluding legal holidays. The telephone number for the Public Reading 
Room is (202) 566-1744,

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and the telephone number for the EPA Docket Center is (202) 566-1742.

FOR FURTHER INFORMATION CONTACT: Ms. Karen Rackley, Office of Air 
Quality Planning and Standards, Sector Policies and Programs Division, 
Coatings and Chemicals Group (E143-01), U.S. EPA, Research Triangle 
Park, NC 27711; telephone number: (919) 541-0634, e-mail address: 
[email protected].

SUPPLEMENTARY INFORMATION:
    Regulated Entities. Categories and entities potentially regulated 
by the proposed amendments include municipal solid waste (MSW) 
landfills and owners/operators of combustion devices that burn 
untreated landfill gas, which may include the following entities:

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                                                 Examples of potentially
            Category               NAICS* code      regulated entities
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Industry: Air and water                  924110  Solid waste landfills.
 resource and solid waste
 management.
Industry: Refuse systems--solid          562212  Solid waste landfills.
 waste landfills.
State, local, and tribal                 562212  Solid waste landfills;
 government agencies.                    924110   Air and water resource
                                                  and solid waste
                                                  management.
Any industry, commercial                   4911  Electric power
 business, or institution or                      generation,
 utility that burns untreated                     transmission, or
 landfill gas in a                                distribution.
 reciprocating engine, turbine,
 boiler, or other combustion
 device (e.g., for energy
 recovery).
                                             49  Electric, gas, and
                                                  sanitary services.
                                             37  Manufacturers of motor
                                                  vehicle parts and
                                                  accessories.
                                             82  Educational services.
                                             29  Petroleum refineries
                                                  and manufacturers of
                                                  coal products.
                                             28  Chemical manufacturers.
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*North American Industry Classification System.

    This table is not intended to be exhaustive, but rather provides a 
guide for readers regarding entities likely to be regulated by the 
proposed amendments. To determine whether your facility would be 
regulated by the proposed amendments, you should carefully examine the 
applicability criteria in 40 CFR 60.32c of subpart Cc, 40 CFR 60.750 of 
subpart WWW, 40 CFR 62.14352 of subpart GGG, or 40 CFR 63.1935 and 40 
CFR 63.1940 of subpart AAAA. If you have any questions regarding the 
applicability of the proposed amendments to a particular entity, 
contact the person listed in the preceding FOR FURTHER INFORMATION 
CONTACT section.
    Docket. The docket number for the proposed amendments to the 
Landfills NSPS (40 CFR part 60, subpart WWW), emission guidelines (40 
CFR part 60, subpart Cc), Federal plan (40 CFR part 62, subpart GGG), 
and Landfills NESHAP (40 CFR part 63, subpart AAAA) is Docket ID No. 
EPA-HQ-OAR-2003-0215. Docket ID No. A-88-09 contains supporting 
information for the landfills NSPS and emission guidelines and Docket 
ID No. EPA-OAR-2002-0047 and Docket ID No. A-98-28 contain the 
supporting information for the Landfills NESHAP. Docket ID No. A-98-03 
and Docket ID No. A-88-09 contain supporting information for the 
landfills Federal plan.
    WorldWide Web (WWW). In addition to being available in the docket, 
an electronic copy of the proposed amendments is available on the WWW 
through the Technology Transfer Network Website (TTN). Following 
signature, EPA will post a copy of the proposed amendments on the TTN's 
policy and guidance page for newly proposed or promulgated rules at 
http://www.epa.gov/ttn/oarpg. The TTN provides information and 
technology exchange in various areas of air pollution control.
    Outline. The information presented in this preamble is organized as 
follows:

I. Background
    A. What rules affect MSW landfills?
    B. What is the purpose of the proposed amendments?
II. Summary of the Proposed Amendments
    A. What changes did we propose to the Landfills NSPS on May 23, 
2002?
    B. What supplemental amendments are we proposing to the 
Landfills NSPS, emission guidelines, and Federal plan?
    C. What changes are we proposing to the Landfills NSPS and 
Landfills NESHAP regarding startup, shutdown, and malfunction?
    D. What other corrections and clarifications are we proposing?
    E. Are we requesting public comment on any other issues?
III. Rationale for the Proposed Supplemental Amendments
    A. Definition of Landfill Owner/Operator and Allowance for Off-
site Control or Treatment Option
    B. Definitions for Treated Landfill Gas and Treatment System and 
Clarification to the Treatment Option
IV. Rationale for Proposed Landfills NSPS and Landfills NESHAP 
Amendments Regarding Startup, Shutdown, and Malfunction
    A. Proposed Landfills NSPS Startup, Shutdown, and Malfunction 
Provisions
    B. Proposed Landfills NESHAP Startup, Shutdown, and Malfunction 
Provisions
V. Rationale for Other Proposed Corrections and Clarifications
    A. Clarification of Temperature Monitoring for Enclosed 
Combustors
    B. Correction of Cross-Reference in the Landfills NSPS
    C. Clarification of Bioreactor Moisture Content Determination 
for the Landfills NESHAP
    D. Correction of Date in the Landfills NESHAP
VI. Statutory and Executive Order Reviews
    A. Executive Order 12866, Regulatory Planning and Review
    B. Paperwork Reduction Act
    C. Regulatory Flexibility Act
    D. Unfunded Mandates Reform Act
    E. Executive Order 13132, Federalism
    F. Executive Order 13175, Consultation and Coordination with 
Indian Tribal Governments
    G. Executive Order 13045, Protection of Children from 
Environmental Health Risks and Safety Risks
    H. Executive Order 13211, Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use
    I. National Technology Transfer and Advancement Act

I. Background

A. What rules affect MSW landfills?

    On March 12, 1996 (61 FR 9905), we promulgated the emission 
guidelines for existing MSW landfills and the NSPS for new or modified 
MSW landfills under authority of section 111 of the Clean Air Act 
(CAA). The goal of the emission guidelines and NSPS is to control 
landfill gas emissions to the level achievable through the application 
of the best system of emissions reductions which (taking into account 
the cost of such reduction and any non-air quality health and 
environmental impact and energy requirements) we determine has been 
adequately demonstrated. This is termed the Abest demonstrated 
technology.'' On

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November 8, 1999 (64 FR 60689), we promulgated the landfills Federal 
plan requirements for the purpose of implementing the landfills 
emission guidelines in States without approved State plans.
    The control of landfill gas based on the requirements of the 
Landfills NSPS, emission guidelines, and Federal plan results in 
emissions reductions of over 30 volatile organic compounds and air 
toxics such as toluene, benzene, and vinyl chloride. The reduction of 
these emissions has direct and indirect health benefits as well as 
environmental benefits. In addition, the control of landfill gas 
results in reductions of methane gas emissions, which reduces the 
potential for fires and explosions near landfills. Control of landfill 
gas reduces odor problems, which reduces the potential for local 
property de-valuation and poorer quality of life for local residents. 
Some landfills control landfill gas by combusting it in a boiler, 
engine, or turbine to produce steam or electricity, taking advantage of 
landfill gas as a renewable energy source.
    The landfills emission guidelines, as implemented through an 
approved State plan or the landfills Federal plan, and the Landfills 
NSPS require large landfills (at least 2.5 million megagrams (Mg) and 
2.5 million cubic meters in size) with estimated nonmethane organic 
compound (NMOC) emissions of at least 50 megagrams per year (Mg/yr) to 
collect and control or treat landfill gas. The Landfills NSPS and 
emission guidelines provide landfill owners or operators with some 
degree of flexibility to achieve compliance, allowing them to 
incorporate site-specific factors into the design of the collection and 
control or treatment systems, as long as the systems meet specific 
performance standards. On January 16, 2003 (68 FR 2227), we promulgated 
the Landfills NESHAP under authority of section 112 of the CAA. The 
Landfills NESHAP apply to both major and area sources and contain the 
same requirements as the landfills emission guidelines and Landfills 
NSPS, but add requirements for startup, shutdown, and malfunction 
(SSM), add operating condition deviations for out-of-bounds monitoring 
parameters, require timely control of bioreactor landfills, and change 
the reporting frequency for one type of report.
    On May 23, 2002 (67 FR 36476), we proposed amendments to the 
Landfills NSPS because implementation activity showed a need for 
clarification of some issues. Consideration of the public comments 
received and additional implementation activity has shown the need for 
even further clarification on implementing the Landfills NSPS, emission 
guidelines, and Landfills NESHAP.

B. What is the purpose of the proposed amendments?

    We are proposing supplemental amendments to the May 23, 2002 
proposed amendments to the Landfills NSPS. While today's proposed 
supplemental amendments would, for the most part, specifically amend 
the Landfills NSPS, they would also serve to amend the landfills 
emission guidelines for existing MSW landfills because the emission 
guidelines incorporate many of the provisions of the Landfills NSPS. In 
addition, today's proposed supplemental amendments include conforming 
changes to certain provisions of the landfills emission guidelines that 
do not directly incorporate the provisions of the Landfills NSPS; make 
conforming changes to the landfills Federal plan for existing MSW 
landfills; and would affect changes to the Landfills NESHAP for MSW 
landfills. The supplemental proposed amendments would, in conjunction 
with the previously proposed amendments, further clarify the definition 
of landfill owners/operators; clarify compliance responsibilities in 
situations where multiple entities own/operate a landfill and the gas 
collection, control, or treatment systems (either at the landfill or 
off site); and clarify the definition of treated landfill gas. Today's 
proposed supplemental amendments do not change how you determine 
whether a landfill is ``new'' or ``existing,'' and accordingly subject 
to the Landfills NSPS or emission guidelines. The determination of 
whether an affected facility is new or existing is still based on the 
date of construction or modification of the landfill itself and not the 
date of installation of the gas collection, control, or treatment 
system.
    In allocating certain responsibilities to the landfill owners/
operators and others to the gas collection, control, and/or treatment 
system owners/operators, it is not our intent to establish a precedent 
for any other NSPS or NESHAP. We are proposing this compliance approach 
specifically for landfills because of the unique nature of landfill 
operations and to encourage energy recovery. Landfill gas is commonly 
collected and combusted to produce electricity, steam, or other useful 
energy; combustion for energy recovery often occurs miles away from the 
landfill itself at a separate industrial, commercial, or institutional 
facility. Combusting landfill gas for energy recovery is a reasonable 
approach to meeting the control requirements of the Landfills NSPS and 
also makes use of a renewable energy resource and reduces combustion of 
scarce fossil fuels and emissions produced during their combustion. 
This unique situation raises unique issues on the respective 
responsibilities of landfill owners/operators and gas collection, 
control, and/or treatment system owners/operators for complying with 
the Landfills NSPS.
    Although today's proposed supplemental amendments allocate 
responsibility for complying with certain specified requirements to the 
owners/operators of the MSW landfill and responsibility for complying 
with other specified requirements to the owners/operators of gas 
collection, control and/or treatment systems used to comply with the 
Landfills NSPS, they do not alter compliance responsibilities where 
affected sources \1\ are under common control.\2\ (Today's proposed 
supplemental amendments also continue to recognize that the owner/
operator of the MSW landfill may also be the owner/operator of the gas 
collection, control, and/or treatment system.) The question of whether 
affected sources are under common control may be determined as part of 
permitting activities. In a common control determination, various 
affected sources are aggregated together, and the owner/operator of the 
resulting single source is ultimately responsible for ensuring 
compliance with all applicable requirements (including requirements 
applicable to each of the affected sources/emissions units that make up 
the single source). To ensure that the proposed amendments to the 
Landfills NSPS allocating various compliance responsibilities among the 
owners/operators of affected sources do not conflict with determining 
compliance responsibilities when the affected sources are under common 
control, 40 CFR 60.750(a) of the Landfills NSPS, related sections of 
the landfills emission guidelines, the landfills Federal plan, and the 
Landfills NESHAP specify that responsibility for compliance cannot be 
allocated where landfills and associated

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gas collection, control, and/or treatment systems are under common 
control.
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    \1\ The Landfills NSPS define the affected sources subject to 
the NSPS and the requirements to which these affected sources are 
subject. However, a single source is defined by the program in 
question, e.g., title V, new source review, and in many cases, 
requires the aggregation of emissions units, including affected 
sources.
    \2\ Common control is a key element in defining whether and how 
activities at a site are to be aggregated in determining whether 
they constitute a single source. See, for example, Alabama Power v. 
Costle, 636 F.2d 323 (District of Columbia Circuit, 1979), section 
112(a)(1) of the CAA, 40 CFR 70.2, and 40 CFR 51.166(b)(5) and (6).
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    It is important to note that in cases of common control, although 
the owner/operator of the single source (e.g., the owner/operator of 
the landfill and/or gas collection, control, and/or treatment system) 
is ultimately responsible for ensuring compliance at the source, 
enforcement action could be taken by EPA or a State against the owners/
operators of individual affected sources/emissions units in addition to 
the owner/operator of the single source. This is because enforcement 
action is not limited by the determination of who is ultimately in 
control of a single source, but rather can be taken against the owners/
operators of each individual affected source/emissions unit comprising 
that source.
    Additionally, regardless of the various regulatory approaches that 
are discussed in today's package, all landfills that are at least 2.5 
Mg and 2.5 million cubic meters in size, and all stationary equipment 
that is required by the Landfills NSPS, emission guidelines, Federal 
plan, and Landfills NESHAP to collect, control, and/or treat landfill 
gas from MSW landfills of this size, continue to be subject to the 
requirement to apply for and obtain a title V permit. This is because 
section 502(a) of the CAA requires any source, including an area 
source, subject to standards or regulations under section 111 or 112 of 
the CAA to operate in compliance with a title V permit after the 
effective date of a title V permits program. Thus, regardless of the 
number of affected sources or owner/operators that are relevant in a 
particular MSW landfill situation, all affected sources are required to 
be covered by a title V operating permit. The final regulatory language 
will provide additional clarification on this point after a regulatory 
approach is selected.
    We are proposing further clarifications to the landfill gas 
treatment compliance option, including more specific definitions of 
``treated landfill gas'' and ``treatment system'' in the Landfills 
NSPS.
    We are proposing clarifications that would amend the time allowed 
for malfunction events in the Landfills NSPS. The amendments would also 
clarify the SSM plan requirements and reports and the incorporation of 
maintenance activities in those plans in the Landfills NESHAP.
    The proposed supplemental amendments would correct a test method 
citation in the Landfills NSPS; clarify Landfills NSPS temperature 
monitoring for enclosed combustors; clarify that bioreactor moisture 
content should be determined on a wet weight basis for the Landfills 
NESHAP; and correct a compliance date in the Landfills NESHAP.
    As stated earlier, the proposed supplemental amendments to the 
Landfills NSPS would also serve to amend the landfills emission 
guidelines and Federal plan for MSW landfills where these rules 
specifically incorporate the provisions of the Landfills NSPS. We are 
also proposing direct changes to the landfills emission guidelines to 
maintain consistency with the proposed changes to the Landfills NSPS 
where the emission guidelines did not directly incorporate the 
provisions of the Landfills NSPS. Changes to the landfills Federal plan 
implementing the landfills emission guidelines are being proposed to 
ensure the plan remains consistent with the landfills emission 
guidelines.

II. Summary of the Proposed Amendments

A. What changes did we propose to the Landfills NSPS on May 23, 2002?

    On May 23, 2002, EPA proposed amendments to the Landfills NSPS to 
clarify who is responsible for compliance activities where multiple 
entities are involved in the ownership/operation of a landfill and the 
associated landfill gas collection, control, and/or treatment systems; 
clarify what constitutes treated landfill gas; and correct the omission 
of an exemption for specific boilers and process heaters from the 
initial performance test.
    To be specific, we proposed to amend 40 CFR 60.751 of subpart WWW 
by adding a landfill-specific definition for MSW landfill owners/
operators. This landfill-specific definition would identify MSW 
landfill owners/operators as entities that own or operate the landfill 
or any stationary equipment located on the landfill property that is 
used in the collection, control, and/or treatment of landfill gas. We 
also proposed to amend 40 CFR 60.752 of subpart WWW to allow landfill 
owners/operators to transfer untreated landfill gas off site for 
control or treatment, provided the transferee certifies to us (and 
provides a copy to the landfill owner/operator) that it will control or 
treat the landfill gas in accordance with the Landfills NSPS 
provisions.
    We further proposed to amend 40 CFR 60.751 of subpart WWW by adding 
a definition for treatment system. The May 23, 2002 proposed definition 
for treatment system specified that the system must filter, de-water, 
and compress landfill gas.
    We proposed to amend 40 CFR 60.752(b)(2)(iii)(C) of subpart WWW to 
specify that to achieve compliance with this section, landfill gas must 
be processed in a system that meets the treatment system definition in 
the proposed amendment. We also proposed to amend this section to 
clarify that venting of treated landfill gas to the ambient air is not 
permitted.
    We proposed to amend 40 CFR 60.752(b)(2)(iii)(B) of subpart WWW to 
exempt owners/operators of boilers and process heaters with design 
input capacities of 44 megawatts (MW) or greater from the requirement 
to conduct an initial performance test.

B. What supplemental amendments are we proposing to the Landfills NSPS, 
emission guidelines, and Federal plan?

    Public comments on the May 23, 2002 proposed amendments raised new 
questions and caused us to reconsider the approach we had taken on 
several proposed amendments. Based on further analysis, we are 
proposing supplemental amendments that we expect to help owners/
operators to comply with the Landfills NSPS. As mentioned previously, 
the proposed supplemental amendments clarify: The definition of 
landfill owner/operator; compliance responsibilities when multiple 
entities own/operate a landfill and the associated landfill gas 
collection, control, and/or treatment systems; and what constitutes 
treated landfill gas. Additional proposed amendments, including SSM 
provisions, and other corrections are discussed later in this section 
of this preamble.
    To address compliance responsibilities at landfills where multiple 
entities own/operate the landfill and the associated landfill gas 
collection, control, or treatment systems, we are proposing to add a 
specific definition of ``landfill gas collection, control, or treatment 
system owner/operator'' and to revise the May 2002 proposed definition 
of ``landfill owner/operator'' by removing references to stationary gas 
collection, control, or treatment systems. We are also proposing to 
revise the applicability section to clarify compliance 
responsibilities. We are proposing that the landfill owners/operators 
would be responsible for complying with the requirements of the 
Landfills NSPS that apply to the landfills and any portion of the 
collection, control, or treatment system that they own or operate. The 
owners/operators of the landfill gas collection, control, or treatment 
systems would be responsible for complying with the requirements of the 
Landfills

[[Page 53276]]

NSPS that apply to the portion of the landfill gas collection, control, 
or treatment system that they own or operate. To maintain consistency 
between the Landfills NSPS, emission guidelines, Federal plan, and 
Landfills NESHAP with regard to owner/operator responsibilities, we are 
also proposing similar revisions to the landfills emission guidelines, 
Federal plan, and Landfills NESHAP. As discussed later in this 
preamble, we are requesting comment on this approach, as well as an 
alternative approach regarding compliance responsibilities.
    To clarify what constitutes landfill gas treatment, we propose to 
refine the May 23, 2002 proposed definitions of ``treated landfill 
gas'' and ``treatment system'' in the Landfills NSPS. For filtration 
and de-watering, the refined proposed definitions contain specific 
numerical values that would provide long-term protection of the 
combustion equipment, which would support good combustion. For 
particulate matter filtration, a filter system would be required to 
have an absolute rating no greater than 10 microns. For de-watering, 
the system would be required to reduce the dew point by at least 20 
degrees Fahrenheit.
    We are also clarifying the monitoring requirements for treatment 
systems. To ensure that treatment systems are operating properly to 
achieve the filtration and de-watering levels specified in the revised 
proposed treatment system definition, we are proposing more specific 
monitoring, recordkeeping, and reporting requirements for treatment 
systems used to comply with the Landfills NSPS. We are proposing that 
owners/operators of treatment systems monitor pressure drop across the 
filtration system and temperature or dew point for de-watering systems, 
depending on the type of de-watering system. However, we are proposing 
to allow owners/operators to use other monitoring parameters if they 
demonstrate that such parameters would effectively monitor filtration 
or de-watering system performance. We are clarifying that owners/
operators must develop operating ranges for each monitored operating 
parameter based on manufacturer's recommendations or engineering 
analysis and submit those ranges, along with justification, for 
approval in the design plan required by 40 CFR 60.752(b)(2) of subpart 
WWW. Then, owners/operators would be required to monitor the required 
parameters and keep them within the ranges specified in their approved 
design plan. For recordkeeping and reporting purposes, we are 
clarifying that owners/operators would continuously monitor treatment 
system operating parameters and calculate 24-hour block averages. The 
24-hour block averages would be compared with the operating ranges 
justified in the design plan to determine compliance. The specific 
recordkeeping and reporting requirements for treatment systems would be 
similar to those for control device temperature monitoring requirements 
already detailed in the Landfills NSPS. Owners/operators of treatment 
systems installed prior to today's proposed supplemental amendments 
would be required to comply with the revised treatment system 
requirements as expeditiously as practicable, but no later than 1 year 
after the date the final amendments are promulgated. We are also 
proposing clarifications to various sections of the Landfills NESHAP 
that cross-reference the Landfills NSPS treatment system and monitoring 
requirements to maintain consistency.
    We are not altering the May 23, 2002 proposal to amend 40 CFR 
60.752(b)(2)(iii)(B) of subpart WWW to exempt owners/operators of 
boilers and process heaters with design capacities of 44 MW or greater 
from the requirement to conduct an initial performance test.

C. What changes are we proposing to the Landfills NSPS and Landfills 
NESHAP regarding startup, shutdown, and malfunction?

    The current Landfills NSPS limit the duration of SSM events to 5 
days for the landfill gas collection system and 1 hour for treatment or 
control devices. Since promulgation of the Landfills NSPS, we have 
become aware that some malfunctions cannot be corrected within these 
time frames. Therefore, we propose to revise 40 CFR 60.755(e) of 
subpart WWW to remove the 5 day and 1 hour time limitations. The 
proposed revisions would clarify that the NSPS General Provisions in 40 
CFR 60.11(d) of subpart A continue to apply during malfunctions, and 
that routine maintenance activities must be completed and malfunctions 
must be corrected as soon as practicable after their occurrence in 
order to minimize emissions. To prevent free venting of landfill gas to 
the atmosphere during control device malfunctions or maintenance, we 
would retain the requirement in 40 CFR 60.753(e) of subpart WWW which 
states that in the event the collection or control system is 
inoperable, the gas mover system shall be shut down and all valves in 
the collection and control system contributing to venting of gas to the 
atmosphere shall be closed within 1 hour.
    The Landfills NESHAP have no allowance for shutdown of control 
devices for routine maintenance. Furthermore, after the Landfills 
NESHAP were promulgated, there were revisions to the SSM requirements 
in the NESHAP General Provisions in 40 CFR part 63, subpart A. The 
revised General Provisions contain some changes that are not relevant 
or can be difficult to interpret for landfills. We are, therefore, 
proposing revisions to the Landfills NESHAP that require routine 
maintenance of landfill gas collection, control, and treatment systems 
to be included in the SSM plan. We are also clarifying SSM reporting 
requirements for landfills and the applicability of SSM sections of the 
General Provisions to the Landfills NESHAP.

D. What other corrections and clarifications are we proposing?

    We propose to amend 40 CFR 60.758(b)(2)(i) and 40 CFR 
60.758(c)(1)(i) of subpart WWW by removing the term ``combustion'' from 
the requirement to monitor temperature of enclosed combustors. 
Temperature monitoring is required for enclosed combustors, including 
enclosed flares, turbines, reciprocating engines, and boilers less than 
44 MW. For some enclosed combustors, it is not possible to monitor 
temperature inside the combustion chamber to determine combustion 
temperature. The proposed amendment clarifies that the ``combustion'' 
temperature does not have to be monitored. Temperature could be 
monitored at another location, as long as the monitored temperature 
relates to proper operation of the enclosed combustor.
    We propose to correct a test method cross-reference in 40 CFR 
60.755(c)(3) of subpart WWW necessitated by the reorganization of 
Method 21 in appendix A to 40 CFR part 60.
    In the Landfills NESHAP, we propose to correct 40 CFR 63.1990 of 
subpart AAAA to clarify that the 40 percent moisture content in the 
definition of ``bioreactor'' is determined on a wet weight basis.
    The proposed supplemental amendments would also correct a Landfills 
NESHAP compliance date for existing major sources to read January 16, 
2004 instead of January 13, 2004 in 40 CFR 63.1945(d) of subpart AAAA.
    We propose to amend the definition of ``household waste'' and add a 
definition of ``segregated yard waste'' in 40 CFR 60.751 of subpart WWW 
to clarify our intent regarding the applicability of the Landfills 
NSPS,

[[Page 53277]]

emission guidelines, Federal plan, and Landfills NESHAP to landfills 
that do not accept household waste, but accept segregated yard waste. 
We intended the rules to apply to municipal solid waste landfills that 
accept general household waste (including garbage, trash, sanitary 
waste), as indicated in the definitions sections of these rules. Our 
regulatory analyses for the Landfills NSPS, emission guidelines, and 
Landfills NESHAP were based on landfills containing mixed household 
waste steams. A question has recently arisen on whether a landfill that 
accepts only construction and demolition waste and segregated yard 
waste would be subject to the municipal solid waste Landfills NSPS. We 
did not intend these rules to apply to landfills that accept only 
segregated yard waste or that accept a combination of segregated yard 
waste and non-household waste (such as construction and demolition 
waste or industrial waste). The proposed definition changes in the 
Landfills NSPS would also affect the emission guideline, Federal plan, 
and Landfills NESHAP because they reference the definitions in the 
Landfills NSPS.

E. Are we requesting public comment on any other issues?

    We are requesting public comment on alternative approaches for 
addressing three issues the landfill industry and regulatory agencies 
face in implementing the Landfills NSPS, emission guideline, Federal 
plan, and Landfills NESHAP.
    The first issue deals with closed areas of landfills and when they 
are allowed to remove controls. The current Landfills NSPS define an 
MSW landfill as: ``* * * an entire disposal facility in a contiguous 
geographical space where household waste is placed in or on land * * 
*.'' We have clearly stated in previous documents that the entire 
contiguous area, including both closed landfill sections and new 
landfill sections, is considered a single landfill, even if the 
landfill is bisected by a road, right of way, golf course, etc. Our 
intent has always been to consider the entire contiguous area in 
determining whether a landfill meets the design capacity and emission 
rate criteria for applying controls. Similarly, to remove controls, the 
entire area would need to meet the control removal criteria in the 
Landfills NSPS (e.g., the entire landfill must emit less than 50 Mg 
NMOC per year, must be closed, and the control system must have been in 
operation for at least 15 years). Also, 40 CFR 60.759(a)(3)(ii) allows 
landfill owners/operators to stop collecting gas from ``nonproductive'' 
areas of the landfill if they demonstrate that the excluded areas emit 
less than 1 percent of total NMOC emissions from the landfill.
    It has come to our attention that in many cases, a contiguous area 
will contain unconnected landfill sections that were developed 
sequentially over time. An initial landfill is constructed, filled, 
closed, and capped. Then a new one with a separate liner opens on 
contiguous property. Under the Landfills NSPS, these are part of the 
same landfill and controls cannot be removed from the closed and capped 
area until it emits less than 1 percent of the total NMOC, or until the 
entire contiguous landfill is closed and meets the control system 
removal criteria. In some cases, gas production from the separate 
section that closed many years ago has declined, and the gas 
composition has changed to the point where it is difficult to 
continuously collect and combust the gas. However, the closed area may 
not meet the 1 percent NMOC criteria that would allow removal of the 
control system from that section of the landfill. We request comments 
on any approaches for dealing with such a situation, and the specific 
criteria that could be applied to determine which areas warrant control 
and which may remove control.
    The second issue deals with approval of collection and control 
system design plans. The Landfills NSPS and emission guidelines require 
landfill owners/operators to submit a gas collection and control system 
design plan within 1 year of when their calculated uncontrolled NMOC 
emissions reach 50 Mg/yr. The plan may include requests for alternative 
designs, alternative operational standards, and alternative monitoring 
and recordkeeping. The plan is submitted to the regulatory authority 
that implements the Landfills NSPS or emission guidelines (usually a 
State agency) for approval. The Landfills NSPS and emission guidelines 
require that landfill gas collection and control systems must be 
installed and begin operation within 30 months of the report that 
calculated NMOC emissions have reached 50 Mg/yr, which is 18 months 
after the design plan is submitted. In the 1999 document ``Municipal 
Solid Waste Landfills, Volume 1: Summary of Requirements for New Source 
Performance Standards and Emission Guidelines for Municipal Solid Waste 
Landfills'' (EPA-453R/96-004), we stated that EPA expected that 
implementing agency review and approval of the design plan would take 
approximately 6 months, leaving approximately 12 months for the 
landfill to install the gas collection and control system. It has come 
to our attention that some design plans have been submitted but have 
not been approved or disapproved for a year or even 2 years. As a 
result, some landfills may be faced with the prospect of installing a 
gas collection and control system that they are not sure will be 
approved or may be implementing monitoring approaches that might later 
be disapproved.
    While there must always be an opportunity for the implementing 
agency to review and approve or disapprove each design plan, one 
approach would be that if the implementing agency chooses not to review 
or act on a design plan within a specified amount of time, then the 
design plan would have de facto approval. This would be one way to 
allow the landfill to move ahead to meet the gas collection and control 
provisions within the time allowed by the Landfills NSPS and emission 
guidelines. Note that all design plans must be certified by a 
registered Professional Engineer (P.E.). Also, after the collection and 
control system is installed, quarterly monitoring of the landfill 
surface methane concentration is required to verify that the collection 
system is working properly, and testing and monitoring of control 
devices is also required. Thus, even if a design plan was not reviewed 
and approved, the system will be professionally designed and there will 
still be proof that the collection and control system is achieving the 
level of control required by the Landfills NSPS and emission 
guidelines. We request comment on this approach or other alternative 
approaches to address the issues surrounding timeliness of design plan 
approvals. We also request comment on what period of time would be 
appropriate for review and approval of initial design plans, and 
whether the time period should be different for review and approval of 
amendments or updates to design plans.
    The third issue deals with surface monitoring locations. The intent 
of the rule is to maintain a tight cover that minimizes any emissions 
of landfill gas through the surface. The Landfills NSPS and emission 
guidelines require quarterly surface monitoring to demonstrate that the 
cover and gas collection system are working properly. The operational 
requirements in 40 CFR 60.753(d) of the Landfills NSPS specify that the 
landfill must ``* * * operate the collection system so that the methane 
concentration is less than 500 parts per million above background at 
the surface of the landfills. To determine if this level is exceeded, 
the owner or operator shall conduct surface testing around the 
perimeter of the

[[Page 53278]]

collection area and along a pattern that traverses the landfill at 30 
meter intervals and where visual observations indicate elevated 
concentrations of landfill gas, such as distressed vegetation and 
cracks or seeps in the cover.'' The issue has arisen as to whether the 
quarterly monitoring path should include monitoring of every cover 
penetration. Cover penetrations can be observed visually and are 
clearly a place where gas would be escaping from the cover, so 
monitoring of them would be required by the regulatory language. The 
regulatory language gives distressed vegetation and cracks as an 
example of a visual indication that gas may be escaping, but this 
example does not limit the places that should be monitored by landfill 
staff or by enforcement agency inspectors. Thus, under the current 
language, the landfill should monitor any openings that are within an 
area of the landfill where waste has been placed and a gas collection 
system is required. However, monitoring of every cover penetration 
every quarter could substantially increase monitoring time relative to 
monitoring only along a path at 30 meter intervals and may not be 
necessary every quarter. We request comment on this rule interpretation 
and alternatives for monitoring cover penetrations that do not show 
distressed vegetation, cracks, or similar indications of high landfill 
gas levels.

III. Rationale for the Proposed Supplemental Amendments

A. Definition of Landfill Owner/Operator and Allowance for Off-Site 
Control or Treatment Option

    Amendments were proposed in 2002 to clarify which entities are 
considered landfill owners/operators and are subject to the Landfills 
NSPS, and to clarify compliance responsibilities when landfill gas is 
sent off site for treatment or control. The May 2002 proposed 
amendments and today's proposed supplemental amendments recognize the 
unique natures of the landfills source category and landfill gas. 
Because landfill gas contains methane and can be used as a renewable 
resource to produce useful energy, it is common for landfill gas to be 
sold to entities, other than the landfill, that combust the gas for 
energy recovery. These entities often own and/or operate portions of 
the gas collection system and the control or treatment systems required 
by the Landfills NSPS, emission guidelines, Federal plan, and Landfills 
NESHAP. Control or treatment systems may be located on or adjacent to 
the landfill, or they may be located miles away at a business, 
institution, or industrial plant that is using landfill gas to fuel a 
boiler or other combustion device. This situation is different from 
most source categories where the same entity that generates emissions 
typically controls the emissions within their facility. We recognize 
and encourage beneficial use of landfill gas, but we also want to 
clarify that entities collecting, controlling, or treating the gas are 
responsible for complying with the Landfills NSPS, emission guidelines, 
Federal plan, and Landfills NESHAP.
    Based on a review of the comments that we received on our May 23, 
2002 proposed amendments to clarify the owner/operator definition and 
responsibilities, we have determined that a new approach and further 
revisions are needed to effectively address compliance responsibilities 
in situations where multiple entities own/operate the landfill and 
associated gas collection, control, and/or treatment systems. In May 
2002, we proposed to define ``landfill owner/operator'' as ``* * * any 
entity that owns or operates a MSW landfill or any stationary equipment 
located on the same property as the MSW landfill facility that is used 
to collect, control, or treat landfill gas.'' We also proposed an 
allowance for off-site control or treatment by another entity if that 
entity accepted compliance responsibility through a certification 
process. The certification process would have allowed transfer of 
control or treatment responsibility in specified circumstances without 
holding the landfill owners/operators responsible for the actions of 
the off-site entity.
    However, many commenters stated that the revised definition of 
``landfill owner/operator'' was too broad. Some argued that the 
inclusion of ``* * * any stationary equipment located on the same 
property as a MSW facility that is used to collect, control, or treat 
landfill gas * * *'' would result in ``confusion'' as to who is 
responsible for compliance at a landfill where one or more entities 
operate on the landfill site or in conjunction with the landfill owner/
operator. The commenters explained that the proposed definition was so 
broad that it potentially included entities that act in a supportive 
role on a landfill site. Some commenters also objected to the ``joint 
and several liability'' they believe is inherent in this definition. 
Some commenters cited an example where a developer who may own only a 
portion of the landfill gas collection system and has no rights to gas 
from other sections of the landfill could be considered responsible for 
all NSPS compliance issues at the landfill under the proposed 
definition. Another example cited was a gas collection system operator 
who has a contract with a landfill to perform specific activities, such 
as monitoring and adjusting the gas collection system to maintain 
compliance with the temperature, nitrogen, and oxygen requirements of 
the Landfills NSPS could now be considered a landfill owner/operator 
and held liable for compliance with NSPS requirements beyond their 
contract authority and control. Similarly, a company that owned/
operated only the gas control device could be held responsible for 
landfill and collection system operation activities over which they 
have no control.
    Several of the commenters suggested that compliance responsibility 
at a landfill that operates with multiple on-site entities be 
established, on a voluntary basis, through a certification process 
similar to the off-site certification process proposed in the May 2002 
Landfills NSPS amendments. Ownership and operation of on-site landfill 
gas collection, control, or treatment systems by another entity is a 
common practice, and the commenters wanted the owner/operator of the 
landfill and the on-site entity to have the flexibility to determine 
any division of compliance responsibility. The commenters suggested 
that the landfill owner/operator and the additional entity provide EPA 
with a written certification and an outline of compliance 
responsibilities for the various compliance assurance activities. Other 
commenters noted that limiting the compliance certification option to 
off-site entities would unnecessarily inhibit the flexibility EPA seeks 
to create and would impose an artificial distinction between on-site 
and off-site recipients of untreated landfill gas.
    Based on further consideration, we are proposing supplemental 
amendments that would replace the May 23, 2002 proposed definition of 
``landfill owner/operator'' and the proposed off-site certification 
approach. We recognize that many landfills accomplish control of their 
untreated landfill gas by providing the gas to a business, industry, or 
institutional facility that combusts the untreated gas in a 
reciprocating engine or gas turbine to produce electricity or in a 
boiler, process heater, or furnace to produce steam or heat for a 
useful purpose. This may occur at the landfill or at another location. 
The beneficial use of landfill gas, a renewable energy source, offsets 
the use of fossil fuels that can generate greater emissions. To 
facilitate the beneficial use of landfill gas, we propose to clarify 
compliance

[[Page 53279]]

responsibilities in cases where multiple entities are involved in a way 
that will ensure Landfills NSPS compliance and enforceability, but will 
not discourage beneficial use of the gas.
    We are now proposing that compliance responsibility at landfills 
that operate with multiple entities be divided based on which entity 
owns/operates each specific collection, control, or treatment system, 
or a portion thereof. To retain consistency between the Landfills NSPS, 
emission guidelines, Federal plan, and Landfills NESHAP, the same 
approach is proposed for all four rules. The proposed supplemental 
amendments state that the landfill owners/operators are responsible for 
complying with the requirements of the NSPS for the landfill and any 
portion of the landfill gas collection, control, or treatment system 
that they own/operate. The owners/operators of the gas collection, 
control, and/or treatment system(s) would be responsible for complying 
with the requirements for the portion of the landfill gas collection, 
control, or treatment system that they own/operate.
    We are proposing to accomplish this division of responsibility 
through the addition of a definition of ``landfill gas collection, 
control, or treatment system owner/operator,'' and by revising the May 
2002 proposed definition of ``landfill owner/operator'' to remove any 
reference to landfill gas collection, control, or treatment systems. We 
are placing responsibility for compliance with the Landfills NSPS with 
the owner/operator of the various equipment used to achieve compliance 
by making landfill gas collection, control, or treatment systems (as 
well as the landfill itself) affected sources under the Landfills NSPS 
and assigning responsibility for compliance with requirements 
applicable to such systems to the owners/operators of the landfill gas 
collection, control, and/or treatment system located on or off the 
landfill property. In the proposed supplemental amendments, we are 
revising the applicability requirements of the Landfills NSPS to 
indicate that responsibility for compliance with the provisions of the 
Landfills NSPS is based on which portions of the landfill gas 
collection, control, and/or treatment system each entity owns or 
operates. The owner/operator of the landfill itself is responsible for 
determining when control is required, ensuring that the equipment 
necessary to comply with the Landfills NSPS is properly installed, and 
complying with other regulatory requirements that apply to the landfill 
itself and to any portions of the gas collection, control, and/or 
treatment system that the landfill itself owns/operates. Furthermore, 
we are proposing a default compliance provision in the applicability 
section of the Landfills NSPS that would automatically shift all future 
responsibilities, including compliance responsibilities, to the 
landfill owner/operator if another entity that owns/operates the gas 
collection, control, or treatment system ceases to accept the landfill 
gas for any reason (e.g., bankruptcy, abandonment of operation).
    We believe that this is a reasonable approach to addressing 
compliance issues at landfills where multiple entities are involved in 
the emission control infrastructure (regardless of whether treatment or 
control of the landfill gas is accomplished at the landfill or at 
another location). This approach enables direct enforcement of the 
Landfills NSPS on the responsible entity in all cases and is consistent 
with the original intent of the Landfills NSPS. In many cases, landfill 
gas control system owners/operators (for example) are different 
entities from the landfill owners/operators, and the landfill owners/
operators have no direct control over the operation of the control 
system. Because they are distinct entities, it may be impractical and 
may not be good policy to require the landfill owners/operators to 
retain responsibility for all aspects of the Landfills NSPS compliance. 
Landfill owners/operators may not have unrestricted access to the 
location where the treatment or control of the landfill gas is 
occurring (e.g., an industrial plant using the gas in a boiler several 
miles away from the landfill) and often do not have direct control of 
the daily operation of the treatment or control system. Furthermore, 
clarification of the division of responsibilities is a practical means 
to encourage the use of landfill gas for energy recovery and is 
consistent with EPA policy to foster the use of landfill gas as a 
renewable energy resource, thereby reducing the use of scarce fossil 
fuels and associated emissions.
    We are also proposing that all entities keep a list documenting 
which aspects of the Landfills NSPS requirements (by paragraph and 
section number) each entity will comply with. The list would have to 
include all requirements of the Landfills NSPS, and would be required 
as expeditiously as practicable, but no later than 1 year after the 
final rule amendments are promulgated. The list would help assure that 
all required compliance activities are considered and will be performed 
by the responsible entity. The Landfills NSPS would require that the 
list be kept up-to-date and that all owners/operators maintain a copy 
of the list onsite and comply with the responsibilities in the list 
that are assigned to them. The compliance responsibilities of each 
entity will be incorporated in title V permits if the entities are 
subject to title V.
    Because the landfills emission guidelines and Federal plan cross-
reference the Landfills NSPS, the changes to the Landfills NSPS would 
automatically affect the landfills emission guidelines and Federal 
plan. However, to be consistent and clear, we are proposing similar 
language on the responsibilities of the landfill owners/operators and 
the owners/operators of the gas collection, control, or treatment 
system to 40 CFR 60.32c of subpart Cc and to 40 CFR 62.14352 of subpart 
GGG. Because the landfills emission guidelines are implemented through 
CAA section 111(d) State plans, the States would be required to adopt 
revisions to their landfills State plans and submit them to EPA for 
approval within 9 months after the final amendments to the emission 
guidelines are promulgated. The 9-month time frame is consistent with 
40 CFR part 60 subpart B, which establishes procedures for State plans 
to implement section 111(d) emission guidelines. Similarly, EPA is 
proposing to amend the landfills Federal plan that implements the 
landfills emission guidelines in areas where there is no approved State 
plan.
    In addition, we are proposing similar amendments to the Landfills 
NESHAP. The proposed amendments include revising the sections of 40 CFR 
part 63, subpart AAAA, that define affected sources and describe who is 
subject to the Landfills NESHAP, to include owners/operators of gas 
collection, control, and/or treatment systems. The proposed revisions 
to the Landfills NESHAP contain similar language on responsibilities 
and the requirement for all entities to keep a list documenting which 
aspects of Landfills NESHAP compliance each entity will comply with.
    Given the proposed revisions to the definitions and the rule 
applicability sections describing responsibilities, we believe that 
compliance responsibilities would be clearly delineated among the 
entities involved, and EPA would retain clear enforcement ability for 
all entities subject to compliance with the Landfills NSPS, emission 
guidelines, Federal plan, and Landfills NESHAP. The entities that own/
operate the collection, control, and/or treatment equipment needed to 
comply with the Landfills NSPS, emission guidelines, Federal plan, and 
Landfills NESHAP, and are

[[Page 53280]]

performing the activities needed to comply with them, would be held 
directly responsible for compliance.
    The proposed approach previously discussed contains a provision 
that immediately shifts all future compliance responsibilities to the 
landfill owners/operators if another entity that owns/operates the gas 
collection, control, or treatment system ceases to accept the landfill 
gas (e.g., due to bankruptcy, abandonment of operation). We are 
considering an alternative approach (called alternative approach 
1) that would retain this provision and would further require 
the landfill owners/operators to assume responsibility for future 
compliance in some situations where the owners/operators of a gas 
collection, control, or treatment system fail to comply with the 
Landfills NSPS requirements for which they are responsible. The intent 
of this approach would be to address situations where the owners/
operators of the gas collection, control, or treatment system do not 
achieve the required levels of collection, control, or treatment, or 
repeatedly violate other requirements of the Landfills NSPS, and do not 
correct these violations and come into compliance in a timely manner. 
In such circumstances, responsibility for future compliance would 
automatically shift to the landfill owners/operators. As a result, the 
landfill owners/operators would need to find a way to immediately start 
meeting all Landfill NSPS requirements. Such a provision would ensure 
that the landfill owners/operators could not knowingly send landfill 
gas to entities that flagrantly violate the Landfill NSPS, thereby 
inflicting potential harm on the environment, and still avoid 
responsibility for fully complying with the Landfills NSPS. It is not 
our intent for this approach to shift responsibility to the landfill 
owners/operators for isolated or minor violations that the collection, 
control, or treatment system owners/operators timely corrects. We 
solicit comments on this alternative approach and suggestions for how 
to make clear within what time frame and under what circumstances 
responsibility shifts to the landfill owners/operators.
    We are also considering a different alternative approach to 
compliance responsibility (called alternative approach 2) that 
would add the same definitions of ``landfill owner/operator'' and 
``landfill gas collection, control, or treatment system owner/
operator'' as the proposed approach. Both entities would be subject to 
the Landfills NSPS. This approach would differ in that the alternative 
approach would make the landfill owner/operator responsible for 
compliance with all aspects of the Landfills NSPS. Like the proposed 
approach, the alternative approach would make the landfill gas 
collection, control, and/or treatment system owners/operators 
responsible for complying with only the Landfills NSPS requirements 
applicable to the portion of the landfill gas collection, control, and/
or treatment system they own/operate. Thus, a violation of gas 
collection, control or treatment requirements could be enforced against 
both the landfill owners/operators and the collection, control, or 
treatment system owners/operators. This approach would also include the 
requirement to document which aspects of the Landfills NSPS 
requirements (by paragraph and section number) each entity will accept 
compliance responsibility.
    The regulatory language for the alternative approach would be very 
similar to the regulatory language shown for the proposed approach, 
except that 40 CFR 60.750(a)(1) of subpart WWW, 40 CFR 60.32c of 
subpart Cc, 40 CFR 62.14352 of subpart GGG, and 40 CFR 63.1935(d)(1) of 
subpart AAAA might read as follows: ``Municipal solid waste landfill 
owners/operators are responsible for complying with all requirements of 
this subpart.''
    Alternative approach 2 would be consistent with the 
division of responsibilities in many single source (i.e., common 
control) determinations for landfills and associated gas collection, 
control, and/or treatment systems. It would also encourage landfill 
owners/operators who contract with other companies to collect, control, 
or treat the landfill gas to be sure to do business only with reliable 
companies that will meet the Landfills NSPS requirements.
    There are some concerns that this alternative approach could 
inhibit the beneficial use of landfill gas. Landfill owners/operators 
may choose to flare the gas themselves rather than enter into 
agreements that allow other entities to combust the untreated landfill 
gas for energy recovery purposes if the landfill owners/operators are 
held legally and financially liable for the actions of a separate 
entity over which they have no control. Landfill owners/operators may 
be particularly reluctant to enter into such agreements in cases where 
the landfill gas is used at a separate industrial or commercial 
facility located several miles away from the landfill and the landfill 
owners/operators do not have access to the facility or control over its 
operation.
    We specifically request comment on the alternative approach. Based 
on the public comments, the final Landfills NSPS may incorporate the 
proposed approach, one of the two alternative approaches, or another 
similar approach that is a logical outgrowth of the public comments. 
If, after consideration of comments, we select an alternative approach 
for the Landfills NSPS, we would use a consistent approach for the 
emission guidelines, Federal plan, and Landfills NESHAP.

B. Definitions for Treated Landfill Gas and Treatment System and 
Clarification to the Treatment Option

    In the May 23, 2002 proposed amendments, we proposed a definition 
for ``treatment system'' that would be used to determine if a facility 
qualifies for the treatment option provided in 40 CFR 
60.752(b)(2)(iii)(C) of subpart WWW. The purpose of this definition was 
to provide consistency as to what would qualify as a treatment system 
and to reduce the burden on State and local agencies and EPA Regions 
currently performing case-by-case determinations related to the 
adequacy of treatment options being employed across the Nation. The 
proposed definition of treatment system was ``a system that filters, 
de-waters, and compresses landfill gas.''
    Following proposal of the treatment system definition, several 
commenters requested further clarification as to what levels of 
filtration and de-watering would be considered acceptable to meet the 
definition of treatment. Some commenters noted that given the different 
specifications for landfill gas-derived fuels and the different levels 
of treatment currently practiced, any lack of clarity may result in 
inconsistent case-by-case determinations by local permitting 
authorities. Some commenters requested that EPA allow owners/operators 
to treat their gas such that it would meet the end-use combustion 
equipment ``manufacturer's requirements'' for fuel quality as the 
benchmark for what qualifies as a treatment system. Commenters 
requested that we link the phrase ``refer to manufacturer 
requirements'' to the combustion device's specific level of gas 
treatment to ensure complete combustion. Other commenters requested 
that EPA develop specific particulate, moisture, and compression 
targets that demonstrate ``treated landfill gas.''
    We agree with commenters that the definition of treatment system 
needs additional detail. We contacted manufacturers of combustion 
devices that are used to recover energy from landfill gas, and we 
obtained their written specifications and

[[Page 53281]]

recommendations for fuel quality. As suggested by the commenters, we 
reviewed the available manufacturers' specifications for acceptable 
moisture and particulate levels. Because different manufacturers have 
different specifications, our proposed definition of ``treatment 
system'' does not refer directly to the manufacturers' requirements. 
Instead, we developed specific filtration and de-watering targets based 
on those requirements.
    The selected levels of de-watering and filtration are consistent 
with most manufacturers' specifications for landfill gas burned in 
energy recovery devices such as reciprocating engines, gas turbines, 
and boilers; they are protective of the combustion equipment and 
promote good combustion. The supplemental proposed definition of 
treatment system is:

    * * * a system that has an absolute filtration rating of 10 
microns or less, lowers the water dew point of the landfill gas by 
at least 20 degrees Fahrenheit with a de-watering process, and 
compresses the landfill gas.

    The term ``absolute filtration rating'' used in the above 
definition means the diameter of the largest hard spherical particle 
that would pass through the filter. The supplemental proposed 
definition would specify treatment levels that will minimize 
degradation of the combustion device and promote proper destruction of 
NMOC.
    To ensure continuous compliance with the treatment option, we are 
clarifying monitoring, recordkeeping, and reporting requirements for 
treatment systems that are used to comply with the Landfills NSPS. 
Owners/operators of treatment systems used to comply with the Landfills 
NSPS would be required to establish, monitor, and record operating 
parameters that indicate proper operation of the various treatment 
system components, consistent with the proposed revised definition of 
treatment system. These requirements would ensure that the treatment 
system is continuously operating in the manner in which it was designed 
to operate to achieve the specific filtration, de-watering, and 
compression targets that define a treatment system for the purposes of 
the Landfills NSPS. Owners/operators who installed treatment systems 
prior to today's proposed amendments would be required to comply with 
the amended treatment system requirements as expeditiously as 
practicable, but no later than 1 year after the date the final 
amendments are promulgated. This provides time needed to upgrade the 
treatment system (if necessary), submit design information, install 
monitoring equipment, and establish operating parameter levels.
    The proposed amendments would require that owners/operators of 
treatment systems monitor and maintain specified operating parameters 
or apply to monitor alternative parameters. For filtration systems, the 
pressure drop (24-hour average) across the filter would be continuously 
monitored and maintained above the minimum pressure drop established by 
engineering analysis or manufacturer's specifications. Alternatively, 
the owners/operators could get approval to monitor another parameter 
that indicates proper performance of the filtration system. Pressure 
drop was selected as a monitoring parameter because it is a good 
indicator of proper filter operation. A noticeable reduction in 
pressure drop across the filter indicates a breach of the filter 
material.
    Continuous monitoring of temperature reduction for a chiller-based 
de-watering system, dew point from a de-watering system that is not 
chiller-based, or another approved parameter that is indicative of 
proper performance of the de-watering system, would also be required. 
The monitored parameter (24-hour average) would have to be kept within 
the operating range established by engineering analysis or 
manufacturer's specifications. The owners/operators would submit the 
treatment system design and justification for the operating parameter 
ranges for approval in the design plan required by 40 CFR 60.752(b)(2) 
of subpart WWW.
    For chiller-based de-watering systems, temperature was selected as 
a monitoring parameter because it indicates that the chiller is 
operating properly and the desired reduction in dew point is occurring. 
Untreated landfill gas is saturated with moisture as it comes out of 
the landfill (i.e., the relative humidity is 100 percent, and the dew 
point temperature equals the landfill gas temperature). Therefore, if 
the gas is chilled by at least 20 degrees, the dew point has been 
correspondingly reduced, and moisture removal has occurred through 
condensation. Continuous measurement of the gas temperature at the 
treatment system inlet and the chiller outlet would be required unless 
the owners/operators demonstrate that monitoring the temperature at a 
single location (e.g., the chiller outlet) is sufficient to indicate 
that the temperature of the gas, and thus, the dew point, has been 
reduced by at least 20 degrees Fahrenheit. The owners/operators would 
be required to submit, as part of the design plan, treatment system 
design specifications that demonstrate the treatment system meets the 
definition (including the 20 degree dew point reduction) and a 
justification that their proposed temperature monitoring location(s) 
are adequate to demonstrate that the gas temperature, and thus, the dew 
point, has been reduced by at least 20 degrees. For example, owners/
operators might submit information demonstrating that the lowest 
landfill gas temperature at their treatment system inlet during the 
coldest month of the year is 85 degrees Fahrenheit. They might elect to 
operate their chiller to reduce the gas temperature to, for example, 60 
degrees Fahrenheit, and apply to continuously monitor only chiller 
outlet temperature and maintain it at or below 60 degrees. Because the 
design and operation of this system results in a minimum temperature 
reduction of at least 25 degrees below the site-specific coldest 
treatment system inlet temperature, the regulatory authority might 
approve the continuous monitoring of chiller outlet temperature in this 
case, rather than requiring continuous monitoring at both the treatment 
system inlet and the chiller outlet. Temperature monitors are readily 
available, commonly used, reliable, and less expensive than alternative 
monitoring systems.
    If a de-watering system that is not based on chilling, for example, 
a desiccant system, is used, then temperature would not be an 
appropriate parameter to monitor. In such cases, monitoring of the dew 
point would indicate whether the system is operating properly to reduce 
the dew point by 20 degrees. As with temperature, the dew point would 
be monitored at the inlet and outlet of the treatment system, unless 
the owner/operator demonstrates that monitoring at a single location 
(e.g., the treatment system outlet) is sufficient to indicate that the 
dew point has been reduced by at least 20 degrees. Dew point monitors 
are available and suitable for landfill gas applications.
    We are proposing continuous monitoring with a 24-hour averaging 
period for treatment system monitoring parameters for several reasons. 
Monitoring is needed to assure continuous compliance. Continuous 
monitoring systems are available for the selected treatment system 
operating parameters. Data collection would be required at 15-minute 
intervals, consistent with current Landfills NSPS requirements for 
flare pilot flame monitoring and enclosed combustor temperature 
monitoring that apply to landfills that opt to comply with the control 
options rather than the

[[Page 53282]]

treatment option. A 24-hour block average for determining compliance 
with the treatment system operating parameter limits is sufficient to 
indicate any significant change in treatment system operation and would 
be less burdensome than more frequent averaging. Owners/operators of 
treatment systems would be required to report periods when the 24-hour 
block average for a monitored parameter (e.g., pressure drop, 
temperature, dew point) is outside the operating range established in 
the approved design plan.

IV. Rationale for Proposed Landfills NSPS and Landfills NESHAP 
Amendments Regarding Startup, Shutdown, and Malfunction

A. Proposed Landfills NSPS Startup, Shutdown, and Malfunction 
Provisions

    The Landfills NSPS specify in 40 CFR 60.755(e) of subpart WWW, that 
the emission standards do not apply during SSM events, but they limit 
the duration of SSM events to 5 days for the landfill gas collection 
system and 1 hour for treatment or control devices. At the time we 
developed this provision, we believed that malfunctions could be 
corrected within these time frames. Since promulgation of the Landfills 
NSPS, we have learned that many malfunctions cannot be corrected within 
these time limits. This causes landfills that do not have back-up 
control devices to have unavoidable violations of the Landfills NSPS. 
Most landfills use flares to control landfill gas emissions and do not 
have back-up control devices. In developing NSPS, EPA is required by 
CAA section 111 to consider cost and other impacts. In developing the 
Landfills NSPS, we did not consider any costs for requiring back-up 
controls for flares in our determination that the selected requirements 
were reasonable. We did not intend for the Landfills NSPS to require 
back-up control devices for flares. For these reasons, we conclude that 
the 1-hour and 5-day time limitations are not feasible and should be 
changed. Furthermore, most NSPS do not set specific limits on the 
duration of SSM events. Most NSPS rely on the NSPS General Provisions 
(40 CFR part 60, subpart A), which require owners/operators, to the 
extent practicable, to operate in a manner that minimizes emissions 
during SSM events.
    The Landfills NSPS also has no allowance for shutdown of 
collection, control, or treatment systems for routine preventive 
maintenance. Periodic maintenance is needed to provide continued good 
operation of the gas collection and control systems and to avoid 
malfunctions, but shutdowns for maintenance could result in a 
violation. This issue arises because of the unique nature of landfills. 
Most NSPS regulate manufacturing processes that can be stopped when a 
control device needs to be maintained or repaired. For example, 
chemical plants typically shut down their processes on a regular 
schedule (e.g., for 1 week each year) and maintain their control 
devices at the same time, when no emissions are being generated from 
the production process. Landfills are a biological process, and once 
waste is deposited in the landfill, gas is continuously generated and 
cannot be stopped. Routine control device maintenance procedures often 
cannot be completed in 1 hour, and some types of maintenance take days.
    Therefore, we propose to amend 40 CFR 60.755(e) of subpart WWW to 
remove the 1-hour and 5-day time limits on SSM events, and to allow 
routine maintenance of collection, control, and treatment systems. The 
proposed amendments also clarify that the NSPS General Provisions in 40 
CFR 60.11(d) of subpart A continue to apply during maintenance and 
malfunctions, and that routine maintenance activities must be completed 
and malfunctions must be corrected as soon as practicable after their 
occurrence in order to minimize emissions. To prevent free venting of 
landfill gas to the atmosphere during control device malfunctions or 
maintenance, we propose to retain the current requirement in 40 CFR 
60.753(e) of subpart WWW. This section requires that in the event the 
collection or control system is inoperable, the gas mover system must 
be shut down and all valves in the collection and control system 
contributing to venting of gas to the atmosphere must be closed within 
1 hour.

B. Proposed Landfills NESHAP Startup, Shutdown, and Malfunction 
Provisions

    The Landfills NESHAP has no allowance for shutdown of control 
devices for routine maintenance. Periodic maintenance is needed to 
provide continued good operation of the gas collection and control 
systems and to avoid malfunctions, but shutdowns for maintenance could 
result in a violation. As explained previously, this issue arises 
because of the unique nature of landfills. Most NESHAP regulate 
manufacturing processes that can be stopped when a control device needs 
to be maintained or repaired. Landfills are a biological process, and 
once waste is deposited in the landfill, gas is continuously generated 
and cannot be stopped. To allow for routine maintenance of gas 
collection, control, and treatment systems, while ensuring that 
emissions are minimized during routine maintenance events, we propose 
to amend the Landfills NESHAP to require owners/operators to include 
routine maintenance in their SSM plans. The Landfills NESHAP already 
require owners/operators to develop an SSM plan. The plan must 
describe, in detail, procedures for operating and maintaining the 
source during SSM events and a program of corrective action for 
malfunctioning air pollution control and monitoring equipment used to 
comply with the Landfills NESHAP. The purpose of the SSM plan is to 
ensure that owners/operators have fully considered how best to comply 
with the general duty to minimize emissions during SSM events. While 
the requirements of the SSM plan are not themselves applicable 
requirements, the SSM plan is a useful tool for sources to demonstrate, 
and for permitting authorities to confirm that the general duty to 
minimize emissions is met. We propose to add a requirement that the SSM 
plan must include a plan for conducting routine maintenance on the 
landfill gas collection, control, and treatment systems. The routine 
maintenance plan must include maintenance procedures and actions that 
will be taken to minimize emissions during maintenance, shutdown 
frequency, shutdown duration, and procedures for minimizing emissions 
during startup and shutdown of the collection, control, and/or 
treatment systems for routine maintenance. A copy of the SSM plan would 
be maintained on site. Failure to prepare or maintain a copy of the SSM 
plan on site would be a deviation from the requirements of the 
Landfills NESHAP.
    We are also proposing changes to the periodic reporting and 
immediate reporting requirements for SSM events. After the Landfills 
NESHAP were promulgated, there were revisions to the SSM reporting 
requirements in the NESHAP General Provisions in 40 CFR part 63, 
subpart A. Because of the unique nature of landfills, some sections of 
the revised General Provisions are not relevant to landfills or can be 
difficult to interpret for landfills. We propose to revise the 
Landfills NESHAP to clarify the SSM reporting requirements for 
landfills. We propose to remove the Landfills NESHAP cross-reference in 
table 1 of 40 CFR part 63, subpart AAAA to the periodic and immediate 
SSM reporting requirements in 40 CFR 63.10(d)(5) of subpart A (the 
General Provisions), and to instead include similar SSM reporting 
provisions that apply specifically to landfills in 40 CFR 63.1980 of 
subpart AAAA.

[[Page 53283]]

    The Landfills NESHAP and the General Provisions require periodic 
(semiannual) reporting when actions taken during a startup or shutdown 
causing an exceedance of an applicable emission limit or a malfunction 
are consistent with the procedures specified in the SSM plan. Because 
we are proposing that the landfills SSM plan must include routine 
maintenance of landfill gas collection, control, and treatment systems, 
we are proposing to add a requirement in 40 CFR 63.1980 of subpart AAAA 
that the semiannual SSM report include a description of routine 
maintenance activities that were conducted during the period. We 
propose that the landfills periodic SSM report include the date, 
duration, and identification of each SSM event (including shutdowns of 
the landfill gas collection, control, or treatment system for routine 
maintenance) that occurred during the reporting period. For landfills, 
the duration of such events is particularly important, because, unlike 
traditional industrial sources, there is no way to stop the biological 
processes that result in landfill emissions. While collection system 
blowers can be turned off and vents to the atmosphere closed for a 
period of hours to a couple of days to retain most gas within the 
landfill, eventually the pressure in the landfill will build up and the 
gas will be released uncontrolled through vents or as fugitive 
emissions. We expect that there will be few malfunction or maintenance 
events during a 6-month period, and all such events must already be 
recorded under the Landfills NESHAP and the General Provisions (40 CFR 
63.6(e)(3) of subpart A), so including the date and duration of each 
event in the periodic report is not a burden. If the owners/operators 
follow their SSM plan during all SSM and routine maintenance events, 
then no further information is required in the periodic report. This 
will minimize the reporting burden for owners/operators who follow 
their SSM plans.
    The Landfills NESHAP periodic report would also require a brief 
description of any actions taken during a malfunction or routine 
maintenance event that are inconsistent with the SSM plan. This was a 
requirement of the NESHAP General Provisions at the time the Landfills 
NESHAP were developed. The General Provisions have since been changed 
to require sources to ``identify'' any instance where an action was 
taken that was inconsistent with the SSM plan but the source did not 
exceed any applicable emissions limitations. A ``description'' is 
required only if an emissions limitation was exceeded. For landfills, 
it is unclear how to determine if any emissions limitation was exceeded 
because the Landfills NESHAP do not require continuous emissions 
monitoring. They require continuous parametric monitoring of control 
devices, quarterly monitoring of surface methane concentrations, and 
monthly monitoring of collection system well head parameters. If there 
is a malfunction or shutdown of a control device for routine 
maintenance, the collection system blowers must be turned off and vents 
to the atmosphere must be closed. However, despite these precautions, 
landfill gas continues to be generated and can escape the landfill as 
fugitive emissions, potentially increasing landfill NMOC emissions 
above the level achieved when the control device is operating and 
increasing surface methane concentrations. To avoid having to make 
subjective judgments on whether emissions limitations were exceeded, we 
propose that landfills provide a brief description of any malfunction 
or maintenance event where actions are taken that are inconsistent with 
the SSM plan. This is consistent with the intent during development of 
the Landfills NESHAP, and was already accounted for in the estimates of 
the recordkeeping and reporting burden for the final rule. Events where 
the SSM plan is not followed should be infrequent and would not occur 
during most semiannual reporting periods.
    We are proposing revisions in 40 CFR 63.1980 of subpart AAAA to 
clarify immediate SSM reporting requirements for landfills. We propose 
that immediate reports be required if actions taken during a startup or 
shutdown (including shutdown of the collection, control, or treatment 
system for routine maintenance) that caused an exceedance of an 
applicable emission limit, or during a malfunction are inconsistent 
with the SSM plan. Such events would be reported by telephone or fax 
within 2 days, followed by a letter within 7 days of the end of the 
event. This is the same timing and method of submission contained in 
the NESHAP General Provisions requirements for immediate SSM reports. 
We also propose immediate reports if the duration of a shutdown or 
malfunction (including shutdown of the landfill gas collection, 
control, or treatment system for routine maintenance) exceeds 5 days. 
The Landfills NESHAP compliance provisions have always referred to the 
Landfills NSPS, which require that control system malfunctions not 
exceed 1 hour and collection systems malfunctions not exceed 5 days. 
For the reasons described earlier in this preamble, we are proposing to 
remove these time limits from the Landfills NSPS, so the Landfills 
NESHAP would no longer include these time limits by reference. Instead 
of limiting the duration of malfunction and routine maintenance events 
to no more than 5 days, we propose to require landfills to report, as 
part of their Landfills NESHAP immediate SSM reports, any events that 
last longer than 5 days. This will allow the enforcement agency and the 
landfill to discuss the specific situation, the reason that more than 5 
days is needed, and any actions that can be taken to minimize emissions 
during the event and complete repairs or maintenance as expeditiously 
as practicable in the given situation. It should be noted that the 
Landfills NESHAP already refer to the SSM plan requirements in 40 CFR 
63.6(e) of subpart A, which require sources to correct malfunctions as 
soon as practicable after their occurrence.
    Finally, we propose a minor amendment in the calculation of 3-hour 
block averages for control device operating parameters that are 
continuously monitored. The proposed amendment would reduce burden, 
improve consistency with other rules, and ensure that all the necessary 
information is available for compliance determination. In particular, 
40 CFR 63.1975 of subpart AAAA specifies that 3-hour averages are 
calculated in the same way as the Landfills NSPS except that periods of 
SSM should not be included. We have received comments that this 
difference in the calculations requires landfills to keep two sets of 
records that are similar, but not identical, creating an unnecessary 
burden. Furthermore, other NESHAP require all operating parameter 
deviations to be recorded, regardless of whether they occur during an 
SSM event. For these reasons, we propose to amend the Landfills NESHAP 
calculations to be more similar to the Landfills NSPS, and no longer 
exclude periods of SSM. This amendment in the calculations will not 
change the way in which compliance is determined or the NESHAP are 
enforced. The enforcement agency still determines whether a deviation 
is a violation. For example, if a parameter deviation occurred because 
of a malfunction, and the source took appropriate actions to minimize 
emissions during the malfunction and to correct the malfunction as soon 
as practicable, then the enforcement agency may determine that the 
deviation is not a violation.

[[Page 53284]]

V. Rationale for Other Proposed Corrections and Clarifications

A. Clarification for Temperature Monitoring for Enclosed Combustors

    Currently, the language in 40 CFR 60.758(b)(2)(i) and (c)(1)(i) of 
subpart WWW (the Landfills NSPS) requires sources to keep records of 
the combustion temperature in an enclosed combustion device that is 
used to meet the NMOC destruction requirements in 40 CFR 
60.752(b)(2)(iii) of subpart WWW. The definition of ``enclosed 
combustor'' includes enclosed flares, boilers, reciprocating engines, 
and turbines. The literal meaning of this requirement is that a 
temperature monitor would be installed in the combustion zone of an 
enclosed combustor. However, we realize that installing a temperature 
monitor in the combustion zone of a reciprocating engine or turbine is 
not feasible, and we did not intend for the Landfills NSPS to 
specifically require monitoring of combustion chamber temperature. The 
purpose of the temperature monitoring requirement is to ensure that the 
enclosed combustor is operating in a manner similar to the conditions 
at which it was operating during the most recent performance test, 
thereby demonstrating continuous compliance with the NMOC reduction 
requirements of the Landfills NSPS. Therefore, the temperature monitor 
should be located in a place that provides a reasonable indication of 
the operation of the enclosed combustor. For example, monitoring the 
temperature at the cylinder exhaust port or in the exhaust manifold 
before the turbocharger are acceptable temperature monitoring locations 
for reciprocating engines. To minimize further confusion on this issue, 
we are revising the language in 40 CFR 60.758(b)(2)(i) and (c)(1)(i) of 
subpart WWW to remove the word ``combustion'' prior to ``temperature.'' 
The Landfills NSPS will continue to require that at least one 
temperature measurement must be recorded every 15 minutes as specified 
in 40 CFR 60.758(b)(2)(i) of subpart WWW, and any measurement frequency 
that is longer than 15 minutes is not acceptable for compliance under 
the Landfills NSPS. The Landfills NSPS also continue to allow landfill 
owners/operators to propose site-specific alternatives to the 
monitoring requirements, subject to Administrator approval, as 
specified in 40 CFR 60.752(b)(2)(i) of subpart WWW.

B. Correction of Cross-Reference in the Landfills NSPS

    We are proposing an amendment to a cross-reference in 40 CFR 
60.755(c)(3) of subpart WWW (the Landfills NSPS) as a result of the 
reorganization of EPA Method 21 in appendix A to 40 CFR part 60. The 
Landfills NSPS reference section 4.3.1 of EPA Method 21. In 2001, the 
wording that used to be in section 4.3.1 was moved to section 8.3.1, so 
the Landfills NSPS need to be corrected to refer to section 8.3.1 of 
EPA Method 21.

C. Clarification of Bioreactor Moisture Content Determination for the 
Landfills NESHAP

    The Landfills NESHAP definition of bioreactors in 40 CFR 63.1990 of 
subpart AAAA include a provision that the average moisture content of 
the waste in the area into which liquid is added must be at least 40 
percent (by weight) for the landfill or portion of the landfill to be 
considered a bioreactor. It was not explicit that the 40 percent 
moisture content should be determined on a wet weight basis. The 
information EPA originally used to establish the 40 percent moisture 
criteria was on a wet weight basis. To clarify this, we are amending 
the bioreactor definition in 40 CFR 63.1990 of subpart AAAA by adding 
the words ``wet weight basis.''

D. Correction of Date in the Landfills NESHAP

    We are proposing to amend a typographical error that appears in 40 
CFR 63.1945(d) of subpart AAAA. The compliance date for existing major 
sources should read January 16, 2004, instead of January 13, 2004.

VI. Statutory and Executive Order Reviews

A. Executive Order 12866, Regulatory Planning and Review

    This action is not a ``significant regulatory action'' under the 
terms of Executive Order 12866 (58 FR 51735, October 4, 1993) and is 
therefore not subject to review under the Executive Order.

B. Paperwork Reduction Act

    Information Collection Requests (ICR) were prepared for the 
Landfills NSPS, the Landfills NESHAP, and the Federal plan that 
implements the landfills emission guidelines, and all three ICR were 
approved by OMB. A copy of the Landfills NSPS ICR (ICR No. 1557.04), 
landfills Federal plan ICR (ICR No. 1893.01), and the Landfills NESHAP 
ICR (ICR No. 1938.02) may be obtained from Susan Auby by mail at U.S. 
EPA, Office of Environmental Information, Collection Strategies 
Division (2822T), 1200 Pennsylvania Avenue, NW., Washington, DC 20460, 
by e-mail at [email protected], or by calling (202) 566-1672. A copy 
may also be downloaded off the Internet at http://www.epa.gov/icr.
    The proposed amendments to the Landfills NSPS, emission guidelines, 
Federal plan, and Landfills NESHAP will have no impact on the 
information collection burden estimates made previously. The proposed 
treatment monitoring system requirements are within the burden 
estimated in the previous ICR for the Landfills NSPS, Federal plan, and 
Landfills NESHAP. In the previous ICR burden estimates, we assumed that 
all landfills meeting the NSPS and emission guidelines criteria would 
install combustion control devices and would continuously monitor 
control device operating parameters (e.g., presence of flare pilot 
flame or temperature of an enclosed combustion device). Thus, the cost 
of continuous monitoring systems and associated recordkeeping and 
reporting were included for every landfill. Landfills that choose to 
comply with the Landfills NSPS, emission guidelines, Federal plan, or 
Landfills NESHAP by using a treatment system instead of a control 
device typically make that choice because it is a less expensive 
compliance alternative. Therefore, the previous cost analysis and ICR 
provide a conservatively high estimate of the costs of compliance, 
monitoring, recordkeeping, and reporting, and the proposed treatment 
system monitoring requirements would not result in a change to the ICR 
burden estimates. The proposed amendments to clarify the inclusion of 
control device shutdowns for maintenance in the SSM plan are consistent 
with the original estimate of costs to prepare an SSM plan in the 
Landfills NESHAP ICR, No. 1938.02. Consequently, the ICR have not been 
revised.
    Burden means the total time, effort, or financial resources 
expended by persons to generate, maintain, retain, or disclose or 
provide information to or for a Federal agency. This includes the time 
needed to review instructions; develop, acquire, install, and utilize 
technology and systems for the purposes of collecting, validating, and 
verifying information, processing and maintaining information, and 
disclosing and providing information; adjust the existing ways to 
comply with any previously applicable instructions and requirements; 
train personnel to be able to respond to a collection of information; 
search data sources; complete and review the collection of information; 
and transmit or otherwise disclose the information.
    An agency may not conduct or sponsor, and a person is not required 
to

[[Page 53285]]

respond to a collection of information unless it displays a currently 
valid OMB control number. The OMB control numbers for EPA's regulations 
in 40 CFR are listed in 40 CFR part 9.

C. Regulatory Flexibility Act

    The Regulatory Flexibility Act (RFA) generally requires an agency 
to prepare a regulatory flexibility analysis of any rule subject to 
notice and comment rulemaking requirements under the Administrative 
Procedures Act or any other statute unless the agency certifies that 
the rule will not have a significant economic impact on a substantial 
number of small entities. Small entities include small businesses, 
small organizations, and small government jurisdictions.
    For purposes of assessing the impact of the proposed amendments, 
small entity is defined as: (1) A small business that is primarily 
engaged in the collection and disposal of refuse in a landfill 
operation as defined by NAICS codes 562212 and 924110 with annual 
receipts less than $10 million; (2) a small governmental jurisdiction 
that is a government of a city, county, town, school district or 
special district with a population of less than 50,000, and (3) a small 
organization that is any not-for-profit enterprise that is 
independently owned and operated and is not dominant in its field.
    After considering the economic impacts of the proposed amendments 
on small entities, I certify that this action will not have a 
significant economic impact on a substantial number of small entities. 
In determining whether a rule has a significant economic impact on a 
substantial number of small entities, the impact of concern is any 
significant adverse economic impact on small entities, since the 
primary purpose of the regulatory flexibility analyses is to identify 
and address regulatory alternatives ``which minimize any significant 
economic impact of the rule on small entities.'' 5 U.S.C. 603 and 604. 
Thus, an agency may certify that a rule will not have a significant 
economic impact on a substantial number of small entities if the rule 
relieves regulatory burden, or otherwise has a positive economic effect 
on all of the small entities subject to the rule.
    EPA has determined that it is not necessary to prepare a regulatory 
flexibility analysis in connection with the proposed amendments. The 
proposed amendments clarify the applicability of control requirements 
in the Landfills NSPS, emission guidelines, Federal plan, and Landfills 
NESHAP and do not include provisions that create a new burden for 
regulated entities.
    The proposed amendments do not increase the stringency of the 
Landfills NSPS, emission guidelines, Federal plan, or Landfills NESHAP, 
nor do the proposed amendments add additional control requirements. The 
proposed amendments do not increase the control, monitoring, 
recordkeeping, and reporting requirements of the promulgated Landfills 
NSPS, emission guidelines, Federal plan, or Landfills NESHAP, and may 
decrease these requirements under specific conditions for some 
entities. We have therefore concluded that today's proposed rule will 
relieve regulatory burden for all affected small entities.

D. Unfunded Mandates Reform Act

    Title II of the Unfunded Mandates Reform Act (UMRA) of 1995, Public 
Law 104-4, establishes requirements for Federal agencies to assess the 
effects of their regulatory actions on State, local, and tribal 
governments and the private sector. Under section 202 of the UMRA, EPA 
generally must prepare a written statement, including a cost-benefit 
analysis, for proposed and final rules with ``Federal mandates'' that 
may result in expenditures by State, local, and tribal governments, in 
the aggregate, or by the private sector, of $100 million or more in any 
1 year. Before promulgating an EPA rule for which a written statement 
is needed, section 205 of the UMRA generally requires EPA to identify 
and consider a reasonable number of regulatory alternatives and adopt 
the least costly, most cost-effective, or least burdensome alternative 
that achieves the objectives of the rule. The provisions of section 205 
do not apply when they are inconsistent with applicable law. Moreover, 
section 205 allows EPA to adopt an alternative other than the least 
costly, most cost-effective, or least burdensome alternative if the 
Administrator publish with the final rule an explanation why that 
alternative was not adopted. Before EPA establishes any regulatory 
requirements that may significantly or uniquely affect small 
governments, including tribal governments, it must have developed under 
section 203 of the UMRA a small government agency plan. The plan must 
provide for notifying potentially affected small governments, enabling 
officials of affected small governments to have meaningful and timely 
input in the development of EPA regulatory proposals with significant 
Federal intergovernmental mandates, and informing, educating, and 
advising small governments on compliance with the regulatory 
requirements.
    EPA has determined that the proposed amendments do not contain a 
Federal mandate that may result in expenditures of $100 million or more 
for State, local, and tribal governments, in the aggregate, or the 
private sector in any 1 year. Thus, the proposed amendments are not 
subject to the requirements of sections 202 and 205 of the UMRA. In 
addition, we have determined that the proposed amendments contain no 
regulatory requirements that might significantly or uniquely affect 
small governments because they consist of new definitions and 
clarifications and do not impose new costs on government entities or 
the private sector. Therefore, the proposed amendments are not subject 
to the requirements of section 203 of the UMRA.

E. Executive Order 13132, Federalism

    Executive Order 13132 (64 FR 43255, August 10, 1999) requires EPA 
to develop an accountable process to ensure ``meaningful and timely 
input by State and local officials in the development of regulatory 
policies that have federalism implications.'' ``Policies that have 
federalism implications'' is defined in the Executive Order to include 
regulations that have ``substantial direct effects on the States, on 
the relationship between the national government and the States, or on 
the distribution of power and responsibilities among the various levels 
of government.''
    The proposed amendments do not have federalism implications. They 
do not have substantial direct effects on the States, on the 
relationship between the national government and the States, or on the 
distribution of power and responsibilities among the various levels of 
government, as specified in Executive Order 13132.
    The proposed amendments do not impose additional costs or result in 
additional control requirements above those considered at promulgation 
of the 1996 Landfills NSPS and emission guidelines and the 2003 
Landfills NESHAP. In developing the 1996 Landfills NSPS and emission 
guidelines, we consulted extensively with State and local governments 
to enable them to provide meaningful and timely input in the 
development of those rulemakings. Because the control requirements of 
the proposed amendments are the same as those developed in 1996, these 
previous consultations still apply. In addition, State and local 
government agencies participated in a conference call on the

[[Page 53286]]

Landfills NESHAP, and provided comments on the 2000 Landfills NESHAP 
proposal and a 2002 supplemental proposal, which we considered. For a 
discussion of our consultations with State and local governments, the 
nature of the governments' concerns, and our position supporting the 
need for the specific control requirements included in the Landfills 
NSPS, emission guidelines, and Landfills NESHAP, see the preamble to 
the 1996 Landfills NSPS (61 FR 9905, March 12, 1996). Thus, Executive 
Order 13132 does not apply to the proposed amendments.
    On May 23, 2002, in the spirit of Executive Order 13132, we 
specifically solicited comments on the proposed amendments from State 
and local officials (67 FR 36479). We are again soliciting comments on 
today's supplemental proposed amendments.

F. Executive Order 13175, Consultation and Coordination With Indian 
Tribal Governments

    Executive Order 13175 (65 FR 67249, November 9, 2000) requires EPA 
to develop an accountable process to ensure ``meaningful and timely 
input by tribal officials in the development of regulatory policies 
that have tribal implications.''
    The proposed amendments do not have tribal implications as 
specified in Executive Order 13175. They will not have substantial 
direct effects on tribal governments, on the relationship between the 
Federal government and Indian tribes, or on the distribution of power 
and responsibilities between the Federal government and Indian tribes, 
as specified in Executive Order 13175. Thus, Executive Order 13175 does 
not apply to the proposed amendments.
    On May 23, 2002, we specifically solicited comment from tribal 
officials on the proposed amendments (67 FR 36479). None were received. 
Information received from EPA Regional Offices during development of 
the landfills Federal plan showed no landfills on tribal land large 
enough to require control under the landfills emission guidelines/
Landfills NSPS.
    In the spirit of Executive Order 13175 and consistent with EPA 
policy to promote communications between EPA and tribal governments, we 
specifically solicit comment on the proposed amendments from tribal 
officials.

G. Executive Order 13045, Protection of Children From Environmental 
Health Risks and Safety Risks

    Executive Order 13045 (62 FR 19885, April 23, 1997) applies to any 
rule that: (1) Is determined to be ``economically significant'' as 
defined under Executive Order 12866, and (2) concerns an environmental 
health or safety risk that EPA has reason to believe may have a 
disproportionate effect on children. If the regulatory action meets 
both criteria, the Agency must evaluate the environmental health or 
safety effects of the planned rule on children, and explain why the 
planned regulation is preferable to other potentially effective and 
reasonably feasible alternatives considered by the Agency.
    EPA interprets Executive Order 13045 as applying only to those 
regulatory actions that are based on health or safety risks, such that 
the analysis required under section 5-501 of the Executive Order has 
the potential to influence the regulation.
    The proposed amendments are not subject to Executive Order 13045 
because they are not economically significant as defined in Executive 
Order 12866 and because they are based on technology performance and 
not on health and safety risks. Furthermore, as no alternative 
technologies exist that would provide greater stringency at a 
reasonable cost, the results of any children's health analysis would 
have no impact on the stringency decision.

H. Executive Order 13211, Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use

    The proposed amendments are not subject to Executive Order 13211 
``Actions Concerning Regulations That Significantly Affect Energy 
Supply, Distribution, or Use'' (66 FR 28355, (May 22, 2001)) because it 
is not a significant regulatory action under Executive Order 12866.

I. National Technology Transfer and Advancement Act

    Section 12(d) of the National Technology Transfer and Advancement 
Act (NTTAA) of 1995, Public Law 104-113, 12(d) (15 U.S.C. 272 note) 
directs EPA to use voluntary consensus standards (VCS) in its 
regulatory activities unless to do so would be inconsistent with 
applicable law or otherwise impractical. VCS are technical standards 
(e.g., material specifications, test methods, sampling procedures, and 
business practices) that are developed or adopted VCS bodies. The NTTAA 
directs EPA to provide Congress, through OMB, explanations when the 
Agency decides not to use available and applicable VCS.
    The proposed amendments do not involve new technical standards; 
thus, the requirements of section 12(d) of the NTTAA do not apply.

List of Subjects in 40 CFR Parts 60, 62, and 63

    Environmental protection, Administrative practice and procedure, 
Air pollution control, Hazardous substances, Intergovernmental 
relations, Reporting and recordkeeping requirements.

    Dated: August 31, 2006.
Stephen L. Johnson,
Administrator.

    For the reasons stated in the preamble, title 40, chapter I, parts 
60, 62, and 63 of the Code of Federal Regulations are proposed to be 
amended as follows:

PART 60--[AMENDED]

    1. The authority citation for part 60 continues to read as follows:

    Authority: 42 U.S.C. 7401-7601.

Subpart Cc--[Amended]

    2. Section 60.31c is amended by adding the definitions of 
``Municipal solid waste landfill gas collection, control, or treatment 
system owner/operator'' and ``Municipal solid waste landfill owner/
operator,'' in alphabetical order to read as follows:


Sec.  60.31c  Definitions.

* * * * *
    Municipal solid waste landfill gas collection, control, or 
treatment system owner/operator means any entity that owns or operates 
any stationary equipment that is used, as specified in Sec.  60.33c, to 
collect, control, or treat landfill gas from an MSW landfill that is a 
designated facility under Sec.  60.32c of this subpart, regardless of 
the location of the control or treatment system.
    Municipal solid waste landfill owner/operator means any entity that 
owns or operates a municipal solid waste landfill that is a designated 
facility under Sec.  60.32c(a).
    3. Section 60.32c is amended by:
    a. Revising paragraph (a); and
    b. Adding paragraph (e) to read as follows:


Sec.  60.32c  Designated facilities.

    (a) The designated facilities to which the guidelines apply are 
each existing MSW landfill for which construction, reconstruction, or 
modification was commenced before May 30, 1991 and/or the stationary 
equipment used to collect, control, or treat the landfill gas from such 
MSW landfills as required by Sec.  60.33c(c).
* * * * *
    (e) For approval, a State plan shall require each MSW landfill 
owner/

[[Page 53287]]

operator and each MSW landfill gas collection, control, or treatment 
system owner/operator, as defined in Sec.  60.31c, to be responsible 
for compliance as specified in paragraphs (e)(1) and (2) of this 
section; provided, however, that if the MSW landfill and the associated 
gas collection, control, and/or treatment system are under common 
control, the entity exercising such control shall be responsible for 
complying with the requirements in both paragraphs (e)(1) and (2) of 
this section.
    (1) Municipal solid waste landfill owners/operators are responsible 
for complying with the requirements of this subpart for the landfill 
and any portion of the landfill gas collection, control, or treatment 
system they own/operate. In addition, if another entity owns/operates 
the gas collection, control, or treatment system used to comply with 
the applicable requirements of this subpart and for any reason (e.g., 
bankruptcy, abandonment of operation) that entity ceases to accept the 
landfill gas, responsibility for complying with all applicable 
requirements to which that entity was subject under this subpart shall 
immediately apply to, and be binding on, the landfill owner/operator. 
The title V permits for landfill owner/operator must be written to 
require that the requirements applicable to the owner/operator of the 
landfill gas collection, control, and/or treatment system immediately 
become applicable requirements of the landfill owners/operators 
whenever the owners/operators of the landfill gas collection, control, 
and/or treatment system cease to accept the landfill gas.
    (2) Municipal solid waste landfill gas collection, control, or 
treatment system owners/operators are responsible for complying with 
the requirements of this subpart for the portion of the landfill gas 
collection, control, or treatment system they own/operate.
    4. Section 60.33c is amended by revising paragraphs (c)(2) and 
(c)(3) to read as follows:


Sec.  60.33c  Emission guidelines for municipal solid waste landfill 
emissions.

* * * * *
    (c) * * *
    (2) A control system designed and operated to reduce nonmethane 
organic compounds (NMOC) by 98 weight percent, or, when an enclosed 
combustion device is used for control, to either reduce NMOC by 98 
weight percent or to reduce the outlet to less than 20 parts per 
million by volume, dry basis as hexane at 3 percent oxygen. The 
reduction efficiency or parts per million by volume shall be 
established by an initial performance test to be completed no later 
than the applicable compliance date specified in Sec.  60.36c. The 
performance test is not required for boilers and process heaters with 
design heat input capacities equal to or greater than 44 megawatts that 
burn landfill gas for compliance with this subpart.
    (3) Route the collected gas to a treatment system that processes 
the collected gas for subsequent sale as fuel for combustion or use as 
a fuel for combustion. Landfill gas sold as fuel for combustion or used 
as a fuel for combustion shall be treated in a treatment system as 
defined in Sec.  60.751 that meets the requirements of Sec.  
60.752(b)(2)(i)(D) and the monitoring, recordkeeping, and reporting 
requirements listed in Sec. Sec.  60.756, 60.757, and 60.758 that apply 
to treatment systems. All emissions from any atmospheric vent from the 
gas treatment system shall be subject to the requirements of paragraph 
(c)(1) or (2) of this section. For purposes of this subpart, 
atmospheric vents located on the condensate storage tank are not part 
of the treatment system and are exempt from the requirements of 
paragraph (c)(1) or (c)(2) of this section. The owners/operators of the 
landfill gas treatment system must ensure compliance with these 
requirements. The owner/operators of a combustion device who use 
treated landfill gas as fuel in a combustion device or purchase treated 
landfill gas for fuel in a combustion device shall be exempt from 
further compliance with this subpart. The treated gas must be used as a 
fuel, and venting of treated landfill gas to the ambient air or 
combustion in a flare is not allowed under this option.
* * * * *
    5. Section 60.36c is amended by adding paragraph (c) to read as 
follows:


Sec.  60.36c  Compliance Times.

* * * * *

    (c) Within nine months after [DATE THE FINAL RULE AMENDMENTS ARE 
PUBLISHED IN THE Federal Register], each State shall adopt and submit 
to the Administrator, revisions to their State plan that implement the 
emission guidelines and compliance times in this subpart, as amended. 
Except as provided under Sec.  60.24, the revised State plan shall 
include the revised definitions in Sec.  60.31c; the designated 
facilities provisions in Sec.  60.32c(a) through (e) and the associated 
recordkeeping requirement in Sec.  60.758(g); the control and treatment 
system requirements in Sec.  60.33c(2) and (3); the associated 
treatment system monitoring, recordkeeping, and reporting requirements 
in Sec. Sec.  60.756 through 60.758 that are cross-referenced in 
Sec. Sec.  60.34c and 60.35c; and a supplemental revised compliance 
schedule.

Subpart WWW--[Amended]

    6. Section 60.750 is amended by revising paragraph (a) to read as 
follows:


Sec.  60.750  Applicability, designation of affected facility, and 
delegation of authority.

    (a) The provisions of this subpart apply to each municipal solid 
waste (MSW) landfill that commenced construction, reconstruction, or 
modification on or after May 30, 1991 and the stationary equipment used 
to collect, control, or treat the landfill gas from such MSW landfills 
required by Sec.  60.752(b)(2). Physical or operational changes made to 
an existing MSW landfill solely to comply with an applicable State plan 
or the Federal plan implementing the requirements of subpart Cc 
(Emission Guidelines and Compliance Times for Municipal Solid Waste 
Landfills) of this part are not considered construction, 
reconstruction, or modification for the purposes of this subpart. Each 
MSW landfill owner/operator and each MSW landfill gas collection, 
control, or treatment system owner/operator, as defined in Sec.  .751, 
is responsible for compliance with this subpart as specified in 
paragraphs (a)(1) and (2) of this section; provided, however, that if 
the MSW landfill and the associated gas collection, control, and/or 
treatment system are under common control, the entity exercising such 
control shall be responsible for complying with the requirements in 
both paragraphs (a)(1) and (2) of this section.
    (1) MSW landfill owners/operators are responsible for complying 
with the requirements of this subpart for the landfill and any portion 
of the landfill gas collection, control, or treatment system they own/
operate. In addition, if another entity owns/operates the gas 
collection, control, or treatment system used to comply with the 
applicable requirements of this subpart and for any reason (e.g., 
bankruptcy, abandonment of operation) that entity ceases to accept the 
landfill gas, responsibility for complying with all applicable 
requirements to which that entity was subject under this subpart shall 
immediately apply to, and be binding on, the landfill owner/operator. 
The title V permits for landfill owners/operators must be written to 
require that the requirements applicable to the owners/operators of the 
landfill gas collection, control, and/or treatment system immediately 
become applicable

[[Page 53288]]

requirements of the landfill owner/operator, whenever the owners/
operators of the landfill gas collection, control, and/or treatment 
system cease to accept the landfill gas.
    (2) Municipal solid waste landfill gas collection, control, or 
treatment system owners/operators are responsible for complying with 
the requirements of this subpart for the portion of the landfill gas 
collection, control, or treatment system they own/operate.
* * * * *
    7. Section 60.751 is amended by:
    a. Revising the definition of ``Household waste''; and
    b. Adding the definitions of ``Absolute filtration rating,'' 
``Municipal solid waste landfill gas collection, control, or treatment 
system owner/operator,'' ``Municipal solid waste landfill owner/
operator,'' ``Segregated yard waste,'' ``Treated landfill gas,'' 
``Treatment system,'' and ``Untreated landfill gas'' in alphabetical 
order to read as follows:


Sec.  60.751  Definitions.

* * * * *
    Absolute filtration rating means the diameter of the largest hard 
spherical particle that would pass through a filter.
* * * * *
    Household waste means any solid waste (including garbage, trash, 
and sanitary waste in septic tanks) derived from households (including, 
but not limited to, single and multiple residences, hotels and motels, 
bunkhouses, ranger stations, crew quarters, campgrounds, picnic 
grounds, and day-use recreation areas). Household waste does not 
include fully segregated yard waste.
* * * * *
    Municipal solid waste landfill gas collection, control, or 
treatment system owner/operator means any entity that owns or operates 
any stationary equipment required by Sec.  60.752(b)(2) of this subpart 
that is used to collect, control, or treat landfill gas from an MSW 
landfill that is subject, regardless of the location of the control or 
treatment system.
    Municipal solid waste landfill owner/operator means any entity that 
owns or operates a municipal solid waste landfill.
* * * * *
    Segregated yard waste means vegetative matter resulting exclusively 
from the cutting of grass, the pruning and/or removal of bushes, 
shrubs, and trees, the weeding of gardens, and other landscaping 
maintenance activities.
* * * * *
    Treated landfill gas means landfill gas processed in a treatment 
system according to this subpart.
    Treatment system means a system that has an absolute filtration 
rating of 10 microns or less, lowers the water dew point of the 
landfill gas by at least 20 degrees Fahrenheit with a de-watering 
process, and compresses the landfill gas.
    Untreated landfill gas means any landfill gas that is not treated 
landfill gas.
    8. Section 60.752 is amended by:
    a. Revising paragraph (b)(2)(i)(D), paragraph (b)(2)(iii)(B) 
introductory text, and paragraph (b)(2)(iii)(C); and
    b. Adding paragraph (b)(2)(i)(E) and paragraph (b)(2)(iii)(D) to 
read as follows:


Sec.  60.752  Standards for air emissions from municipal solid waste 
landfills.

* * * * *
    (b) * * *
    (2) * * *
    (i) * * *
    (D) If the owner or operator chooses to demonstrate compliance with 
the emission control requirements of this subpart using a treatment 
system as defined in this subpart and according to the requirements of 
paragraph (b)(iii)(C) of this section, then the collection and control 
system design plan must include:
    (1) Design specifications for the filtration, de-watering, and 
compression systems that demonstrate conformance with the treatment 
system definition contained in Sec.  60.751.
    (2) The minimum pressure drop across the filtration system, or 
other monitoring parameter(s) and operating ranges that indicate proper 
performance of the filtration system. The collection and control plan 
must include information, such as manufacturer's recommendations or 
engineering analyses, to justify the minimum pressure drop or operating 
ranges for other monitoring parameters.
    (3) The minimum landfill gas temperature reduction across a 
chiller-based de-watering system, the minimum landfill gas dew point 
reduction for a non-chiller-based de-watering system, or other 
operating parameters and operating ranges that indicate proper 
performance of the de-watering system. If the owner/operator requests 
approval to monitor temperature or dew point at a single location, such 
as the outlet of the chiller or de-watering system, rather than at both 
the inlet and outlet, the design plan must demonstrate that the 
proposed monitoring location and site-specific maximum temperature or 
maximum dew point are sufficient to indicate that the dew point has 
been reduced by at least 20 degrees Fahrenheit, according to the 
treatment system definition. The collection and control plan must 
include information, such as manufacturer's recommendations or 
engineering analyses, to justify the operating ranges for temperature, 
dew point, or other monitoring parameters.
    (E) The Administrator shall review the information submitted under 
paragraphs (b)(2)(i)(A), (B), (C), and (D) of this section and either 
approve, disapprove, or request that additional information be 
submitted. Because of the many site-specific factors involved with 
landfill gas system design, alternative systems may be necessary. A 
wide variety of system designs are possible, such as vertical wells, 
combination horizontal and vertical collection systems, or horizontal 
trenches only, leachate collection components, and passive systems.
* * * * *
    (iii) * * *
    (B) A control system designed and operated to reduce NMOC by 98 
weight percent, or, when an enclosed combustion device is used for 
control, to either reduce NMOC by 98 weight percent or to reduce the 
outlet to less than 20 parts per million by volume, dry basis as hexane 
at 3 percent oxygen. The reduction efficiency or parts per million by 
volume shall be established by an initial performance test to be 
completed no later than 180 days after the initial startup of the 
approved control system using the test methods specified in Sec.  
60.754(d). The performance test is not required for boilers and process 
heaters with design heat input capacities equal to or greater than 44 
megawatts that burn landfill gas for compliance with this subpart.
* * * * *
    (C) Route the collected gas to a treatment system that processes 
the collected gas for subsequent sale as a fuel for combustion or use 
as a fuel for combustion. Landfill gas sold as a fuel for combustion or 
used as a fuel for combustion shall be treated in a treatment system as 
defined in Sec.  60.751 that meets the requirements of Sec.  
60.752(b)(2)(i)(D) and the monitoring, recordkeeping, and reporting 
requirements of this subpart that apply to treatment systems. All 
emissions from any atmospheric vent from the gas treatment system shall 
be subject to the requirements of paragraph (b)(2)(iii)(A) or paragraph 
(b)(2)(iii)(B) of this section. For purposes of this rule, atmospheric 
vents located on the condensate storage tank are not part of the 
treatment system and are exempt from the requirements

[[Page 53289]]

of paragraph (b)(2)(iii)(A) or (b)(2)(iii)(B) of this section. The 
owner/operator of the landfill gas treatment system must ensure 
compliance with the treatment requirements. The owner/operator of a 
combustion device who uses treated landfill gas as a fuel in a 
combustion device or purchases treated landfill gas for fuel in a 
combustion device shall be exempt from further compliance with this 
subpart. The treated gas must be used as a fuel, and venting of treated 
landfill gas to the ambient air or combustion in a flare is not allowed 
under this option.
    (D) If an owner/operator complied with the requirements of 
paragraph (b)(2)(iii) of this section by installing and operating a gas 
treatment system on or before September 8, 2006, the owner/operator 
must ensure that the treatment system meets the treatment system 
definition in Sec.  60.751, submit a design plan update including the 
information specified in paragraph (b)(2)(i)(D) of this section, meet 
the requirements of paragraph (b)(2)(iii)(C) of this section, and 
implement all treatment system operating, compliance, monitoring, 
recordkeeping, and reporting requirements of this subpart as 
expeditiously as practicable, but no later than [DATE 1 YEAR AFTER THE 
FINAL RULE AMENDMENTS ARE PUBLISHED IN THE Federal Register]. 
Alternatively, the owner/operator may elect to comply with the control 
requirements in paragraph (b)(2)(iii)(A) or paragraph (b)(2)(iii)(B) of 
this section; submit a design plan update for the control system; and 
comply with all control system operational, testing, compliance, 
monitoring, recordkeeping, and reporting requirements of this subpart 
as expeditiously as practicable, but no later than [DATE 1 YEAR AFTER 
THE FINAL RULE AMENDMENTS ARE PUBLISHED IN THE Federal Register].
* * * * *
    9. Section 60.755 is amended by revising paragraph (c)(3) and 
paragraph (e) to read as follows:


Sec.  60.755  Compliance provisions.

* * * * *
    (c) * * *
    (3) Surface emission monitoring shall be performed in accordance 
with section 8.3.1 of Method 21 of appendix A of this part, except that 
the probe inlet shall be placed within 5 to 10 centimeters of the 
ground. Monitoring shall be performed during typical meteorological 
conditions.
* * * * *
    (e) The provisions of the subpart apply at all times, except during 
periods of startup, shutdown, and malfunction and periods of routine 
maintenance of the landfill gas collection, control, or treatment 
systems. The provisions of Sec.  60.11(d) continue to apply during 
periods of startup, shutdown, malfunction, and routine maintenance of 
the landfill gas collection, control, or treatment systems. Routine 
maintenance activities must be completed and malfunctions must be 
corrected as soon as practicable after their occurrence in order to 
minimize emissions.
    10. Section 60.756 is amended by adding paragraph (g) to read as 
follows:


Sec.  60.756  Monitoring of operations.

* * * * *
    (g) Each owner or operator seeking to demonstrate compliance with 
Sec.  60.752(b)(2)(iii) using a landfill gas treatment system shall 
calibrate, maintain, and operate according to the manufacturer's 
specifications, the following equipment.
    (1) A device that monitors pressure drop across, or other approved 
parameter(s) for, the filtration system that is equipped with a 
continuous recorder that shall record such parameters at least once 
every 15 minutes. Records of hourly and 24-hour block averages computed 
from the continuous monitoring data must also be retained.
    (2) A device that monitors the landfill gas temperature for a 
chiller-based de-watering system, the landfill gas dew point for a non-
chiller-based de-watering system, or the approved operating 
parameter(s) for the de-watering system at the monitoring locations 
specified in the approved design plan required under Sec.  
60.752(b)(2)(i)(D). Each monitoring device must be equipped with a 
continuous recorder that shall record such parameters at least once 
every 15 minutes. Records of hourly and 24-hour block averages computed 
from the continuous monitoring data must also be retained.
    (3) A device that records flow to or bypass of the treatment 
system. The owner or operator shall either:
    (i) Install, calibrate, and maintain a gas flow rate measuring 
device that shall record the flow to the control device at least every 
15 minutes; or
    (ii) Secure the bypass line valve in the closed 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 closed position and 
that the gas flow is not diverted through the bypass line.
    11. Section 60.757 is amended by revising paragraphs (f) 
introductory text and (f)(1) through (f)(3) to read as follows:


Sec.  60.757  Reporting requirements.

* * * * *
    (f) The owner or operator seeking to comply with Sec.  60.752(b)(2) 
using an active collection system designed in accordance with Sec.  
60.752(b)(2)(ii) shall submit to the Administrator annual reports of 
the recorded information in paragraphs (f)(1) through (6) of this 
section. The initial annual report shall be submitted within 180 days 
of installation and start-up of the collection, control, or treatment 
system, and shall include the initial performance test report required 
under Sec.  60.8, as applicable. For enclosed combustion devices, 
treatment systems, and flares, reportable exceedances are defined under 
Sec.  60.758(c).
    (1) Value and length of time for exceedance of applicable 
parameters monitored under Sec.  60.756(a), (b), (c), (d), and (g).
    (2) Description and duration of all periods when the gas stream is 
diverted from the control device or treatment system through a bypass 
line or the indication of a bypass flow as specified under Sec.  
60.756.
    (3) Description and duration of all periods when the control device 
or treatment system was not operating for a period exceeding 1 hour and 
length of time the control device or treatment system was not 
operating.
* * * * *
    12. Section 60.758 is amended by:
    a. Revising paragraph (b) introductory text, paragraph (b)(2)(i), 
paragraph (c) introductory text; and paragraph (c)(1)(i); and
    b. Adding paragraph (b)(5), paragraph (c)(1)(iii); and paragraph 
(g) to read as follows:


Sec.  60.758  Recordkeeping requirements.

* * * * *
    (b) Except as provided in Sec.  60.752(b)(2)(i)(B), for controlled 
landfills, the owner or operator shall keep up-to-date, readily 
accessible records for the life of the control equipment or treatment 
system of the data listed in paragraphs (b)(1) through (5) of this 
section as measured during the initial performance test or compliance 
demonstration, or as submitted and approved under Sec.  
60.752(b)(2)(i)(D). Records of subsequent tests or monitoring shall be 
maintained for a minimum of 5 years. Records of the control device or 
treatment system vendor specifications shall be maintained until 
removal.
* * * * *
    (2) * * *

[[Page 53290]]

    (i) The average temperature measured at least every 15 minutes and 
averaged over the same time period of the performance test.
* * * * *
    (5) Where an owner or operator subject to the provisions of this 
subpart seeks to demonstrate compliance with Sec.  60.752(b)(2)(iii) 
through the use of a treatment system:
    (i) The approved minimum pressure drop across the filtration 
system, or the approved operating ranges for other monitoring 
parameter(s) that indicate proper performance of the filtration system, 
as specified in the approved design plan required by Sec.  
60.752(b)(2)(i)(D).
    (ii) The approved minimum temperature reduction or approved maximum 
outlet temperature of a chiller-based de-watering system, the approved 
minimum dew point reduction or maximum outlet dew point of a non-
chiller-based de-watering system, or the approved operating ranges for 
other monitoring parameter(s) that indicate proper performance of the 
de-watering system, as specified in the approved design plan required 
by Sec.  60.752(b)(2)(i)(D).
    (c) Except as provided in Sec.  60.752(b)(2)(i)(B), for a 
controlled landfill subject to the provisions of this subpart, the 
owner or operator shall keep for 5 years up-to-date, readily accessible 
continuous records of the equipment operating parameters specified to 
be monitored under Sec.  60.756 as well as up-to-date, readily 
accessible records for periods of operation during which the parameter 
boundaries measured during the most recent performance test or 
submitted and approved under Sec.  60.752(b)(2)(i)(D) are exceeded.
    (1) * * *
    (i) For enclosed combustors, except for boilers and process heaters 
with design heat input capacity of 44 megawatts (150 million British 
thermal units (Btu) per hour) or greater, all 3-hour periods of 
operation during which the average temperature was more than 28 [deg]C 
below the average temperature during the most recent performance test 
at which compliance with Sec.  60.752(b)(2)(iii) was determined.
* * * * *
    (iii) For treatment systems used to demonstrate compliance with 
Sec.  60.752(b)(2)(iii), all 24-hour periods of operation during which 
the average operating parameter values are outside of the approved 
ranges identified in Sec.  60.752(b)(2)(i)(D) as those that indicate 
proper performance of the treatment system.
* * * * *
    (g) Where multiple entities exist under the definitions of 
``Municipal solid waste landfill owner/operator'' and ``Municipal solid 
waste landfill gas collection, control, or treatment system owner/
operator'' for an individual MSW landfill and its required gas 
collection, control, or treatment systems, all entities must keep a 
list that shows regulatory section and paragraph numbers, documenting 
which aspects of the requirements of Sec. Sec.  60.752 through 60.759 
each party will comply with. The list must include all requirements of 
this subpart that apply to the MSW landfill and all required gas 
collection, control, or treatment systems. If the list does not 
correctly identify all applicable provisions, all entities involved are 
responsible for compliance with the missing items. All entities must 
keep an identical copy of the list on site and must comply with those 
provisions on the applicable list that are assigned to them until such 
time as the list may be modified. The list must be kept up-to-date. The 
current list and all previously modified lists must be maintained on 
site for 5 years after the date each list was modified. If a gas 
collection, control, or treatment system was installed to comply with 
this subpart on or before September 8, 2006, the list showing the 
requirements that each party will comply with must be completed as 
expeditiously as practicable, but no later than [DATE 1 YEAR AFTER THE 
FINAL RULE AMENDMENTS ARE PUBLISHED IN THE Federal Register]. Entities 
meeting the definition of ``Municipal solid waste landfill owner/
operator'' or ``Municipal solid waste landfill gas collection, control, 
or treatment system owner/operator'' may be held responsible for 
compliance with this subpart as specified in Sec.  60.750(a)(1) and 
(2).

PART 62--[AMENDED]

    13. The authority citation for part 62 continues to read as 
follows:

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

Subpart GGG--[Amended]

    14. Section 62.14351 is amended by adding the definitions of 
``Municipal solid waste landfill gas collection, control, or treatment 
system owner/operator'' and ``Municipal solid waste landfill owner/
operator'' in alphabetical order to read as follows:


Sec.  62.14351  Definitions

* * * * *
    Municipal solid waste landfill gas collection, control, or 
treatment system owner/operator means any entity that owns or operates 
any stationary equipment required by Sec.  62.14353 that is used to 
collect, control, or treat landfill gas from an MSW landfill that is a 
designated facility under Sec.  62.14352(a), regardless of the location 
of the control or treatment system.
    Municipal solid waste landfill owner/operator means any entity that 
owns or operates a municipal solid waste landfill that is a designated 
facility under Sec.  62.14352(a).
* * * * *
    15. Section 62.14352 is amended by: a. Revising paragraph (a) 
introductory text; and
    b. Adding paragraph (g) to read as follows:


Sec.  62.14352  Designated facilities.

    (a) The designated facility to which this subpart applies is each 
existing MSW landfill, and the stationary equipment used to collect, 
control, or treat the landfill gas from such MSW landfills as required 
by Sec.  62.14353 of this subpart, in all States, protectorates, and 
Indian Country that meets the conditions of paragraphs (a)(1) and (2) 
of this section, except for landfills exempted by paragraphs (b) and 
(c) of this section.
* * * * *
    (g) Each MSW landfill owner/operator and each MSW landfill gas 
collection, control, or treatment system owner/operator, as defined in 
Sec.  62.14351, is responsible for compliance as specified in 
paragraphs (g)(1) and (2) of this section; provided, however, that if 
the MSW landfill and the associated gas collection, control, and/or 
treatment system are under common control, the entity exercising such 
control shall be responsible for complying with the requirements in 
both paragraphs (g)(1) and (2) of this section.
    (1) Municipal solid waste landfill owners/operators are responsible 
for complying with the requirements of this subpart for the landfill 
and any portion of the landfill gas collection, control, or treatment 
system they own/operate. In addition, if another entity owns/operates 
the gas collection, control, or treatment system and for any reason 
(e.g., bankruptcy, abandonment of operation) that entity ceases to 
accept the landfill gas, responsibility for complying with all 
applicable requirements to which that entity was subject under this 
subpart shall immediately apply to, and be binding on, the landfill 
owner/operator. The title V permits for landfill owners/operators

[[Page 53291]]

must be written to require that the requirements applicable to the 
owners/operators of the landfill gas collection, control, and/or 
treatment system immediately become applicable requirements of the 
landfill owner/operator whenever the owners/operators of the landfill 
gas collection, control, and/or treatment system cease to accept the 
landfill gas.
    (2) Municipal solid waste landfill gas collection, control, or 
treatment system owners/operator are responsible for complying with the 
requirements of this subpart for the portion of the landfill gas 
collection, control, or treatment system they own/operate.

PART 63--[AMENDED]

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

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

Subpart AAAA--[Amended]

    17. Section 63.1935 is amended by adding paragraphs (c) and (d) to 
read as follows:


Sec.  63.1935  Am I subject to this subpart?

* * * * *
    (c) You are subject to this subpart if you own or operate 
stationary equipment required by Sec.  63.1947 or Sec.  63.1955 that is 
used to collect, control, or treat landfill gas from a municipal solid 
waste landfill that is subject to this subpart (regardless of the 
location of the control or treatment system).
    (d) Each municipal solid waste landfill owner/operator and each 
municipal solid waste landfill gas collection, control, or treatment 
system owner/operator, as defined in Sec.  63.1990, is responsible for 
compliance with this subpart as specified in paragraphs (d)(1) and (2) 
of this section; provided, however, that if the municipal solid waste 
landfill and the associated gas collection, control, and/or treatment 
system are under common control, the entity exercising such control 
shall be responsible for complying with the requirements in both 
paragraphs (d)(1) and (2) of this section.
    (1) Municipal solid waste landfill owners/operators are responsible 
for complying with the requirements of this subpart for the landfill 
and any portion of the landfill gas collection, control, or treatment 
system they own/operate. In addition, if another entity owns/operates 
the gas collection, control, or treatment system and for any reason 
(e.g., bankruptcy, abandonment of operation) that entity ceases to 
accept the landfill gas, responsibility for complying with all 
applicable requirements to which that entity was subject under this 
subpart shall immediately apply to, and be binding on, the landfill 
owner/operator. The title V permits for landfill owners/operators must 
be written to require that the requirements applicable to the owners/
operators of the landfill gas collection, control, and/or treatment 
system immediately become applicable requirements of the landfill 
owner/operator whenever the owners/operators of the landfill gas 
collection, control, and/or treatment system cease to accept the 
landfill gas.
    (2) Municipal solid waste landfill gas collection, control, or 
treatment system owners/operators are responsible for complying with 
the requirements of this subpart for the portion of the landfill gas 
collection, control, or treatment system they own/operate.
    18. Section Sec.  63.1940 is amended by revising paragraph (a) to 
read as follows:


Sec.  63.1940  What is the affected source of this subpart?

    (a) An affected source of this subpart is a MSW landfill, as 
defined in Sec.  63.1990, that meets the criteria in Sec.  63.1935(a) 
or Sec.  63.1935 (b). The affected source includes the entire disposal 
facility in a contiguous geographic space where household waste is 
placed in or on land, including any portion of the MSW landfill 
operated as a bioreactor. The affected source also includes stationary 
equipment required by Sec.  63.1947 or Sec.  63.1955 that is used to 
collect, control, or treat landfill gas from a MSW landfill that is 
subject to this subpart (regardless of the location of the control or 
treatment system).
* * * * *
    19. Section 63.1945 is amended by revising paragraph (d) to read as 
follows:


Sec.  63.1945  When do I have to comply with this subpart?

* * * * *
    (d) If your landfill is an existing affected source and is a major 
source or is collocated with a major source, you must comply with the 
requirements in Sec.  63.1955(b) and Sec. Sec.  63.1960 through 63.1980 
by the date your landfill is required to install a collection and 
control system by 40 CFR 60.752(b)(2) of subpart WWW, the Federal plan, 
or EPA approved and effective State or tribal plan that applies to your 
landfill or by January 16, 2004, whichever occurs later.
* * * * *
    20. Section 63.1955 is amended by revising paragraph (c) to read as 
follows:


Sec.  63.1955  What requirements must I meet?

* * * * *
    (c) For approval of collection and control systems that include any 
alternatives to the operational standards, test methods, procedures, 
compliance measures, monitoring, recordkeeping, or reporting 
provisions, you must follow the procedures in 40 CFR 60.752(b)(2) of 
subpart WWW. If alternatives have already been approved under 40 CFR 
part 60, subpart WWW, or the Federal plan, or EPA-approved and 
effective State or tribal plan, those alternatives can be used to 
comply with this subpart, except that all affected sources must comply 
with the startup, shutdown, and malfunction requirements in subpart A 
of this part as specified in Table 1 of this subpart; and all affected 
sources must submit compliance reports every 6 months as specified in 
Sec.  63.1980(a) and (b), including information on all deviations that 
occurred during the 6-month reporting period. Deviations for continuous 
emission monitors or numerical continuous parameter monitors must be 
determined using a 3-hour monitoring block average for control systems 
used to demonstrate compliance with 40 CFR 60.752(b)(iii)(B) of subpart 
WWW, or a 24-hour monitoring block average for treatment systems used 
to demonstrate compliance with 40 CFR 60.752(b)(iii)(C) of subpart WWW.
* * * * *
    21. Section 63.1960 is revised to read as follows:


Sec.  63.1960  How is compliance determined?

    Compliance is determined in the same way it is determined for 40 
CFR part 60, subpart WWW, including performance testing, monitoring of 
the collection system, continuous parameter monitoring, and other 
credible evidence. In addition, continuous parameter monitoring data, 
collected under 40 CFR 60.756(b)(1), (c)(1), (d) and (g) of subpart 
WWW, are used to demonstrate compliance with the operating conditions 
for control systems or treatment systems. If a deviation occurs, you 
have failed to meet the control device or treatment system operating 
conditions described in this subpart and have deviated from the 
requirements of this subpart. Finally, you must develop a written SSM 
plan according to the provisions in Sec.  63.6(e)(3). Your SSM plan 
must include a plan for conducting routine maintenance on the landfill 
gas collection, control, and treatment systems. The routine maintenance 
plan must include maintenance procedures, actions that will be taken to 
minimize

[[Page 53292]]

emissions during maintenance, shutdown frequency, shutdown duration, 
and procedures for minimizing emissions during startup and shutdown of 
the collection, control, and/or treatment systems for routine 
maintenance. A copy of the SSM plan must be maintained on site. Failure 
to write or maintain a copy of the SSM plan is a deviation from the 
requirements of this subpart.
    22. Section 63.1965 is amended by revising paragraphs (a) and (b) 
to read as follows:


Sec.  63.1965  What is a deviation?

* * * * *
    (a) A deviation occurs when the control device or treatment system 
operating parameter boundaries described in 40 CFR 60.758(c)(1) of 
subpart WWW are exceeded.
    (b) A deviation occurs when 1 hour or more of the hours during the 
applicable 3-hour, or 24-hour, block averaging period specified in 40 
CFR 60.758(c)(1) of subpart WWW does not constitute a valid hour of 
data. A valid hour of data must have measured values for at least three 
15-minute monitoring periods within the hour.
* * * * *
    23. Section 63.1975 is revised to read as follows:


Sec.  63.1975  How do I calculate the block average used to demonstrate 
compliance?

    Averages are calculated in the same way as they are calculated in 
40 CFR part 60, subpart WWW, except that averages computed under this 
subpart shall not include periods of monitoring system breakdowns, 
repairs, calibration checks, and zero (low-level) and high-level 
adjustments.
    24. Section 63.1980 is amended by adding paragraphs (i) and (j) to 
read as follows:


Sec.  63.1980  What records and reports must I keep and submit?

* * * * *
    (i) In lieu of meeting the requirements of Sec.  63.10(d)(5)(i) and 
(ii) of subpart A for periodic and immediate startup, shutdown, and 
malfunction reports, you must comply with the requirements of 
paragraphs (i)(1) and (2) of this section.
    (1) Periodic startup, shutdown, and malfunction reports. The owner 
or operator shall report each startup, shutdown, and malfunction 
(including startups and shutdowns of the landfill gas collection, 
control, or treatment system for routine maintenance) that occurred 
during the semiannual compliance reporting period. Such report shall 
include the date, duration, and identification of each startup, 
shutdown, and malfunction event (including startups and shutdowns of 
the landfill gas collection, control, or treatment system for routine 
maintenance) and any actions taken that were inconsistent with the SSM 
plan. In any instance where any action taken by an owner or operator 
during a startup, shutdown, or malfunction (including actions taken to 
correct a malfunction and actions taken during startup or shutdown of 
the landfill gas collection, control, or treatment system for routine 
maintenance) is not consistent with the affected source's SSM plan, the 
report also shall include a brief description of the startup, shutdown, 
or malfunction event. Reports shall be required only if a startup, 
shutdown, or malfunction (including startups or shutdowns of the 
landfill gas collection, control, or treatment system for routine 
maintenance) occurred during the reporting period. The startup, 
shutdown, and malfunction report shall consist of a letter, containing 
the name, title, and signature of the owner or operator or other 
responsible official who is certifying its accuracy, that shall be 
submitted to the Administrator every 6 months with the reports 
described in paragraph (a) or paragraph (c) through (f) of this 
section.
    (2) Immediate startup, shutdown, and malfunction reports. Any time 
an action taken by an owner or operator during a startup, shutdown, or 
malfunction (including actions taken to correct a malfunction and 
actions taken during startup or shutdown of the landfill gas 
collection, control, or treatment system for routine maintenance) is 
not consistent with the procedures specified in the affected source's 
SSM plan, the owner or operator shall report the actions taken for that 
event within 2 working days after commencing actions inconsistent with 
the plan followed by a letter within 7 working days after the end of 
the event. If the duration of any shutdown or malfunction event 
(including any shutdown of the landfill gas collection, control, or 
treatment system for routine maintenance) exceeds 5 days, the owner or 
operator shall report the event within 2 working days of the date the 
duration of the event exceeds 5 days, followed up by a letter within 7 
working days after the end of the event. The immediate reports required 
under this paragraph (i)(2) shall consist of a telephone call (or 
facsimile (fax) transmission) to the Administrator within 2 working 
days, and it shall be followed by a letter, delivered or postmarked 
within 7 working days after the end of the event, that contains the 
name, title, and signature of the owner or operator or other 
responsible official who is certifying its accuracy, explaining the 
circumstances of the event and the reasons for not following the SSM 
plan. If the duration of any shutdown or malfunction event (including 
any shutdown of the landfill gas collection, control, or treatment 
system for routine maintenance) exceeds 5 days, the immediate report 
shall also include the reasons that the duration of the event exceeded 
5 days and actions taken to minimize the duration of the event. 
Notwithstanding the requirements of the previous sentences in this 
paragraph (i)(2), after the effective date of an approved permit 
program in the State in which an affected source is located, the owner 
or operator may make alternative reporting arrangements, in advance, 
with the permitting authority in that State. Procedures governing the 
arrangement of alternative reporting requirements under this paragraph 
(i)(2) are specified in Sec.  63.9(i) of subpart A.
    (j) Where multiple entities exist under the definitions of 
``Municipal solid waste landfill owner/operator'' and ``Municipal solid 
waste landfill gas collection, control, or treatment system owner/
operator'' for an individual MSW landfill and its required gas 
collection, control, or treatment systems, all entities must keep a 
list that shows regulatory section and paragraph numbers, documenting 
which aspects of the requirements of Sec. Sec.  63.1945 through 63.1980 
each entity will comply with. The list must include all requirements of 
this subpart that apply to the MSW landfill and all required gas 
collection, control, or treatment systems. If the list does not 
correctly identify all applicable provisions, all entities involved are 
responsible for compliance with the missing requirements. All entities 
must keep an identical copy of the list on site and must comply with 
those provisions on the applicable list that are assigned to them until 
such time as the list may be modified. The list must be kept up-to-
date. The current list and all previously modified lists must be 
maintained on site for 5 years after the date each list was modified. 
If a gas collection, control, or treatment system was installed to 
comply with this subpart on or before September 8, 2006, the list 
showing the requirements that each party will comply with must be 
completed no later than [DATE 1 YEAR AFTER THE FINAL RULE AMENDMENTS 
ARE PUBLISHED IN THE Federal Register]. Entities meeting the definition 
of ``Municipal solid waste landfill owner/operator'' or ``Municipal 
solid waste landfill gas collection,

[[Page 53293]]

control, or treatment system owner/operator'' may be held responsible 
for compliance with this subpart as specified in Sec.  63.1935(d)(1) 
and (2).
    25. Section 63.1990 is amended by revising the definition of 
``Bioreactor'' and adding a definition of ``Municipal solid waste 
landfill gas collection, control, or treatment system owner/operator'' 
in alphabetical order to read as follows:


Sec.  63.1990  What definitions apply to this subpart?

    Bioreactor means an MSW landfill or portion of a municipal solid 
waste landfill where any liquid other than leachate (leachate includes 
landfill gas condensate) is added in a controlled fashion into the 
waste mass (often in combination with recirculating leachate) to reach 
a minimum average moisture content of at least 40 percent by weight, 
calculated on a wet weight basis, to accelerate or enhance the 
anaerobic (without oxygen) biodegradation of the waste.
* * * * *
    Municipal solid waste landfill gas collection, control, or 
treatment system owner/operator means any entity that owns or operates 
any stationary equipment required by 40 CFR 60.752(b)(2) of subpart WWW 
or Sec.  63.1947 or Sec.  63.1955 that is used to collect, control, or 
treat landfill gas from a municipal solid waste landfill that is 
subject to this subpart (regardless of the location of the control or 
treatment system).
* * * * *
    26. Table 1 to subpart AAAA of part 63 is amended by:
    a. Revising the entry for Sec.  63.6(e).
    b. Adding a new entry in numerical order for Sec.  63.9(i).
    c. Removing the entry for Sec.  63.10(d)(5) to read as follows:

  Table 1 to Subpart AAAA of Part 63.--Applicability of NESHAP General
                       Provisions to Subpart AAAA
------------------------------------------------------------------------
      Part 63 citation             Description           Explanation
------------------------------------------------------------------------
 
                              * * * * * * *
Sec.   63.6(e), except Sec.   Operation and         Affected sources are
  63.6(e)(3)(iv).              maintenance           subject to the
                               requirements, SSM     provisions in Sec.
                               plan provisions.       63.1980(i)(2)
                                                     instead of Sec.
                                                     63.6(e)(3)(iv).
 
                              * * * * * * *
Sec.   63.9(i)..............  Provisions to adjust  Allows adjustment of
                               the time periods      timing of reports.
                               for postmark
                               deadlines for
                               submitting required
                               reports.
------------------------------------------------------------------------

[FR Doc. 06-7493 Filed 9-7-06; 8:45 am]
BILLING CODE 6560-50-P