
[Federal Register Volume 88, Number 230 (Friday, December 1, 2023)]
[Proposed Rules]
[Pages 83889-83893]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-26119]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63

[EPA-OAR-2023-0406; FRL-10652-01-OAR]
RIN 2060-AV97


Removal of Affirmative Defense Provisions From the National 
Emission Standards for Hazardous Air Pollutants for the Oil and Natural 
Gas Production Facility and Natural Gas Transmission and Storage 
Facility Source Categories

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: The EPA is proposing amendments to the National Emission 
Standards for Hazardous Air Pollutants for the oil and gas industry 
issued under the Clean Air Act. Specifically, the EPA is proposing to 
remove the affirmative defense provisions of the National Emission 
Standards for Hazardous Air Pollutants for both the Oil and Natural Gas 
Production source category and the Natural Gas Transmission and Storage 
source category.

DATES: 
    Comments. Comments must be received on or before January 16, 2024.
    Public hearing: If anyone contacts us requesting a public hearing 
on or before December 6, 2023, we will hold a virtual public hearing. 
See SUPPLEMENTARY INFORMATION for information on requesting and 
registering for a public hearing.

ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-
OAR-2023-0406, by any of the following methods:
     Federal eRulemaking Portal: https://www.regulations.gov/ 
(our preferred method). Follow the online instructions for submitting 
comments.
     Email: [email protected]. Include Docket ID No. EPA-
HQ-OAR-2023-0406 in the subject line of the message.
     Fax: (202) 566-9744. Attention Docket ID No. EPA-HQ-OAR-
2023-0406.
     Mail: U.S. Environmental Protection Agency, EPA Docket 
Center, Docket ID No. EPA-HQ-OAR-2023-0406, Mail Code 28221T, 1200 
Pennsylvania Avenue NW, Washington, DC 20460.
     Hand/Courier Delivery: EPA Docket Center, WJC West 
Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. 
The Docket Center's hours of operation are 8:30 a.m.-4:30 p.m., Monday-
Friday (except Federal holidays).
    Instructions: All submissions received must include the Docket ID 
No. for this rulemaking. Comments received may be posted without change 
to https://www.regulations.gov/, including any personal information 
provided. For detailed instructions on sending comments and additional 
information on the rulemaking process, see the SUPPLEMENTARY 
INFORMATION section of this document.

FOR FURTHER INFORMATION CONTACT: For questions about this proposed 
action, contact U.S. EPA, Attn. Matthew Witosky, Mail Drop: E143-05, 
109 T.W. Alexander Drive, P.O. Box 12055, RTP, North Carolina 27711; 
telephone number: (919) 541-2865; and email address: 
[email protected].

SUPPLEMENTARY INFORMATION: 
    Participation in virtual public hearing. To request a virtual 
public hearing, contact the public hearing team at (888) 372-8699 or by 
email at [email protected]. If requested, the hearing will be 
held via virtual platform on December 18, 2023. The hearing will 
convene at 11 a.m. Eastern Time (ET) and will conclude at 3 p.m. ET. 
The EPA may close a session 15 minutes after the last pre-registered 
speaker has testified if there are no additional speakers. The EPA will 
announce further details at https://www.epa.gov/controlling-air-pollution-oil-and-natural-gas-industry/actions-and-notices-about-oil-and-natural#neshap.
    If a public hearing is requested, the EPA will begin pre-
registering speakers for the hearing no later than 1 business day after 
a request has been received. To register to speak at the virtual 
hearing, please use the online registration form available at https://www.epa.gov/controlling-air-pollution-oil-and-natural-gas-industry/actions-and-notices-about-oil-and-natural#neshap or contact the public 
hearing team at (888) 372-8699 or by email at 
[email protected]. The last day to pre-register to speak at the 
hearing will be December 13, 2023. Prior to the hearing, the EPA will 
post a general agenda that will list pre-registered speakers at: 
https://www.epa.gov/controlling-air-pollution-oil-and-natural-gas-industry/actions-and-notices-about-oil-and-natural#neshap.
    The EPA will make every effort to follow the schedule as closely as 
possible on the day of the hearing; however, please plan for the 
hearings to run either ahead of schedule or behind schedule.
    Each commenter will have 4 minutes to provide oral testimony. The 
EPA encourages commenters to provide the EPA with a copy of their oral 
testimony electronically (via email) by emailing it to 
[email protected]. The EPA also recommends submitting the text of 
your oral testimony as written comments to the rulemaking docket.
    The EPA may ask clarifying questions during the oral presentations 
but will not respond to the presentations at that time. Written 
statements and supporting information submitted during the comment 
period will be considered with the same weight as oral testimony and 
supporting information presented at the public hearing.
    Please note that any updates made to any aspect of the hearing will 
be posted online at https://www.epa.gov/controlling-air-pollution-oil-and-natural-gas-industry/actions-and-notices-about-oil-and-natural#regactions. While the EPA expects the hearing to go forward as 
set forth above, please monitor our website or contact the public 
hearing team at (888) 372-8699 or by email at [email protected] 
to determine if there are any updates. The EPA does not intend to 
publish a document in the Federal Register announcing updates.
    If you require the services of a translator or special 
accommodation such as audio description, please pre-register for the 
hearing with the public hearing team and describe your needs by 
December 8, 2023. The EPA may not be able to arrange accommodations 
without advanced notice.
    Docket. The EPA has established a docket for this rulemaking under 
Docket ID No. EPA-HQ-OAR-2023-0406. All documents in the docket are 
listed in https://www.regulations.gov/. Although listed, some 
information is not publicly available, e.g., Confidential Business 
Information (CBI) or other information whose disclosure is restricted 
by statute.

[[Page 83890]]

Certain other material, such as copyrighted material, is not placed on 
the internet and will be publicly available only in hard copy. With the 
exception of such material, publicly available docket materials are 
available electronically in Regulations.gov.
    Instructions. Direct your comments to Docket ID No. EPA-HQ-OAR-
2023-0406. The EPA's policy is that all comments received will be 
included in the public docket without change and may be made available 
online at https://www.regulations.gov/, including any personal 
information provided, unless the comment includes information claimed 
to be CBI or other information whose disclosure is restricted by 
statute. Do not submit electronically to https://www.regulations.gov/ 
any information that you consider to be CBI or other information whose 
disclosure is restricted by statute. This type of information should be 
submitted as discussed below.
    The EPA may publish any comment received to its public docket. 
Multimedia submissions (audio, video, etc.) must be accompanied by a 
written comment. The written comment is considered the official comment 
and should include discussion of all points you wish to make. The EPA 
will generally not consider comments or comment contents located 
outside of the primary submission (i.e., on the Web, cloud, or other 
file sharing system). For additional submission methods, the full EPA 
public comment policy, information about CBI or multimedia submissions, 
and general guidance on making effective comments, please visit https://www.epa.gov/dockets/commenting-epa-dockets.
    The https://www.regulations.gov/ website allows you to submit your 
comment anonymously, which means the EPA will not know your identity or 
contact information unless you provide it in the body of your comment. 
If you send an email comment directly to the EPA without going through 
https://www.regulations.gov/, your email address will be automatically 
captured and included as part of the comment that is placed in the 
public docket and made available on the internet. If you submit an 
electronic comment, the EPA recommends that you include your name and 
other contact information in the body of your comment and with any 
digital storage media you submit. If the EPA cannot read your comment 
due to technical difficulties and cannot contact you for clarification, 
the EPA may not be able to consider your comment. Electronic files 
should not include special characters or any form of encryption and be 
free of any defects or viruses. For additional information about the 
EPA's public docket, visit the EPA Docket Center homepage at https://www.epa.gov/dockets.
    Submitting CBI. Do not submit information containing CBI to the EPA 
through https://www.regulations.gov/. Clearly mark the part or all of 
the information that you claim to be CBI. For CBI information on any 
digital storage media that you mail to the EPA, note the docket ID, 
mark the outside of the digital storage media as CBI, and identify 
electronically within the digital storage media the specific 
information that is claimed as CBI. In addition to one complete version 
of the comments that includes information claimed as CBI, you must 
submit a copy of the comments that does not contain the information 
claimed as CBI directly to the public docket through the procedures 
outlined in Instructions above. If you submit any digital storage media 
that does not contain CBI, mark the outside of the digital storage 
media clearly that it does not contain CBI and note the docket ID. 
Information not marked as CBI will be included in the public docket and 
the EPA's electronic public docket without prior notice. Information 
marked as CBI will not be disclosed except in accordance with 
procedures set forth in 40 Code of Federal Regulations (CFR) part 2.
    Our preferred method to receive CBI is for it to be transmitted 
electronically using email attachments, File Transfer Protocol (FTP), 
or other online file sharing services (e.g., Dropbox, OneDrive, Google 
Drive). Electronic submissions must be transmitted directly to the 
Office of Air Quality Planning and Standards (OAQPS) CBI Office at the 
email address [email protected], and as described above, should include 
clear CBI markings and note the docket ID. If assistance is needed with 
submitting large electronic files that exceed the file size limit for 
email attachments, and if you do not have your own file sharing 
service, please email [email protected] to request a file transfer link. 
If sending CBI information through the postal service, please send it 
to the following address: OAQPS Document Control Officer (C404-02), 
OAQPS, U.S. Environmental Protection Agency, Research Triangle Park, 
North Carolina 27711, Attention Docket ID No. EPA-HQ-OAR-2023-0406. The 
mailed CBI material should be double wrapped and clearly marked. Any 
CBI markings should not show through the outer envelope.
    Organization of this document. The information in this preamble is 
organized as follows:

I. General Information
    A. Does this action apply to me?
II. Proposed Rule Summary and Rationale
III. Summary of Cost, Environmental, and Economic Impacts
    A. What are the affected sources?
    B. What are the air quality impacts?
    C. What are the cost impacts?
    D. What are the economic impacts?
    E. What are the benefits?
IV. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review and 
Executive Order 14094: Modernizing Regulatory Review
    B. Paperwork Reduction Act (PRA)
    C. Regulatory Flexibility Act (RFA)
    D. Unfunded Mandates Reform Act (UMRA)
    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 (NTTAA)
    J. Executive Order 12898: Federal Actions To Address 
Environmental Justice in Minority Populations and Low-Income 
Populations and Executive Order 14096: Revitalizing our Nation's 
Commitment to Environmental Justice for All

I. General Information

A. Does this action apply to me?

    Categories and entities potentially regulated by this action are 
shown in table 1 of this preamble.

    Table 1--NESHAP and Industrial Source Categories Affected by This
                             Proposed Action
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        Source category               NAICS           NAICS code \1\
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Industry.......................          211111  Crude Petroleum and
                                                  Natural Gas
                                                  Extraction.
                                         211112  Natural Gas Liquid
                                                  Extraction.
                                         221210  Natural Gas
                                                  Distribution.
                                         486110  Pipeline Distribution
                                                  of Crude Oil.
                                         486210  Pipeline Transportation
                                                  of Natural Gas.

[[Page 83891]]

 
Federal Government.............  ..............  Not affected.
State/Local/Tribal Government..  ..............  Not affected.
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\1\ North American Industry Classification System (NAICS).

    This table is not intended to be exhaustive, but rather provides a 
guide for readers regarding entities likely to be affected by this 
action. To determine whether your facility would be regulated by this 
action, you should examine the applicability criteria in the 
regulations. If you have any questions regarding the applicability of 
this action to a particular entity, contact the person listed in the 
preceding FOR FURTHER INFORMATION CONTACT section.

II. Proposed Rule Summary and Rationale

    In 1998 the EPA promulgated National Emission Standards for 
Hazardous Air Pollutants (NESHAP) for the Oil and Natural Gas 
Production Facility and Natural Gas Transmission and Storage Facility 
Source Categories, 40 CFR part 63, subparts HH and HHH. 64 FR 32610 
(June 17, 1999) (``Oil and Gas NESHAP''). In 2012, the EPA amended the 
Oil and Gas NESHAP. 77 FR 49490 (August 16, 2012). The 2012 amendments 
included provisions allowing owners and operators to assert an 
affirmative defense to civil penalties for violations caused by 
malfunctions. See 40 CFR 63.762 and 63.1672. Malfunctions are a sudden, 
infrequent, and not reasonably preventable failure of air pollution 
control and monitoring equipment, process equipment, or a process to 
operate in a normal or usual manner. See 40 CFR 63.2. As defined in 40 
CFR part 63, subparts HH and HHH, ``affirmative defense'' means, ``in 
the context of an enforcement proceeding, a response or defense put 
forward by a defendant, regarding which the defendant has the burden of 
proof, and the merits of which are independently and objectively 
evaluated in a judicial or administrative proceeding.'' See 40 CFR 
63.761 and 63.1271. The EPA established an affirmative defense in 40 
CFR part 63, subparts HH and HHH in an effort to create a system that 
incorporates some flexibility, recognizing that there is a tension, 
inherent in many types of air regulations, to ensure adequate 
compliance while simultaneously recognizing that despite the most 
diligent of efforts, emission standards may be violated under 
circumstances entirely beyond the control of the source (77 FR 49508).
    Although the EPA recognized at the time that its case-by-case 
enforcement discretion provides sufficient flexibility in these 
circumstances, it included the affirmative defense to provide a more 
formalized approach and more regulatory clarity. Id. at 49508-9. See 
also, Weyerhaeuser Co. v. Costle, 590 F.2d 1011, 1057-58 (D.C. Cir. 
1978) (holding that an informal case-by-case enforcement discretion 
approach is adequate); but see Marathon Oil Co. v. EPA, 564 F.2d 1253, 
1272-73 (9th Cir. 1977) (requiring a more formalized approach to 
consideration of ``upsets beyond the control of the permit holder''). 
Under the EPA's regulatory affirmative defense provisions, if a source 
could demonstrate in a judicial or administrative proceeding that it 
had met the requirements of the affirmative defense in the regulation, 
civil penalties would not be assessed.
    In 2014, the United States Court of Appeals for the District of 
Columbia Circuit (D.C. Circuit Court) vacated the affirmative defense 
in one of the EPA's CAA section 112 regulations. Natural Resource 
Defense Council (NRDC) v. EPA, 749 F.3d 1055 (D.C. Cir., 2014) 
(vacating affirmative defense provisions in CAA section 112 rule 
establishing emission standards for Portland cement kilns) (NRDC). The 
court found that the EPA lacked authority to establish an affirmative 
defense for private civil suits and held that under the CAA, the 
authority to determine civil penalty amounts in such cases lies 
exclusively with the courts, not the EPA. Specifically, the court 
found: ``As the language of the statute makes clear, the courts 
determine, on a case-by-case basis, whether civil penalties are 
`appropriate.' '' Id. at 1063 (``[U]nder this statute, deciding whether 
penalties are `appropriate' in a given private civil suit is a job for 
the courts, not EPA.'').\1\
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    \1\ The court's reasoning in NRDC focuses on civil judicial 
actions. The court noted that ``EPA's ability to determine whether 
penalties should be assessed for CAA violations extends only to 
administrative penalties, not to civil penalties imposed by a 
court.'' Id.
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    In light of the NRDC decision mentioned above, the EPA is proposing 
to remove the affirmative defense provisions from the Oil and Gas 
NESHAP. These provisions imply legal authority that the D.C. Circuit 
Court has stated that the EPA does not have.\2\ As explained above, if 
a source is unable to comply with emissions standards as a result of a 
malfunction, the EPA may use its case-by-case enforcement discretion to 
provide flexibility, as appropriate. Further, as the D.C. Circuit 
recognized, in a citizen enforcement action brought under CAA section 
304(a), the court has the discretion to consider any defense raised and 
determine whether penalties are appropriate. Cf. NRDC, 749 F.3d at 1064 
(arguments that violation was caused by unavoidable technology failure 
can be made to the courts in future civil cases when the issue arises). 
The same is true for the presiding officer in EPA administrative 
enforcement actions.\3\
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    \2\ The EPA notes that in 2012, concurrent with the review of 40 
CFR part 63, subparts HH and HHH, the EPA promulgated New Source 
Performance Standards for Crude Oil and Natural Gas Facilities, 40 
CFR part 60, subpart OOOO (``NSPS OOOO''), which also included an 
affirmative defense. See 77 FR 49557. In a subsequent rulemaking 
following the NRDC decision, the EPA removed the affirmative defense 
provision from NSPS OOOO. 79 FR 79018 (Dec. 31, 2014).
    \3\ Although the NRDC case does not address the EPA's authority 
to establish an affirmative defense to penalties that are available 
in administrative enforcement actions, we are not including such an 
affirmative defense in the proposed rule. As explained above, such 
an affirmative defense is not necessary. Moreover, assessment of 
penalties for violations caused by malfunctions in administrative 
proceedings and judicial proceedings should be consistent. Cf. CAA 
section 113(e) (requiring both the Administrator and the court to 
take specified criteria into account when assessing penalties).
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III. Summary of Cost, Environmental, and Economic Impacts

A. What are the affected sources?

    Sources subject to subparts HH and HHH under 40 CFR part 63 of the 
CAA as amended in 1990, section 112.

B. What are the air quality impacts?

    There are no air quality impacts associated with this action. The 
affirmative defense provisions did not affect the stringency of the 
standards in 40 CFR part 63, subparts HH or HHH. The removal of the 
provisions does not have a material impact on the obligation for 
sources to comply with current existing standards, or the ability of 
Federal or State agencies to enforce standards.

[[Page 83892]]

C. What are the cost impacts?

    There are no cost impacts associated with this action. The 
affirmative defense provisions did not affect the stringency of the 
standards in 40 CFR part 63, subparts HH or HHH. The removal of the 
provisions does not have a material impact on the obligation for 
sources to comply with current existing standards, or the ability of 
Federal or State agencies to enforce standards. The EPA estimated a 
small administrative burden to report deviations from standards as a 
result of malfunctions that included the option for an owner or 
operator to offer an affirmative defense. The removal of the 
affirmative defense provisions does not affect that burden because 
sources will still be required to report malfunctions that result in a 
failure to meet the standards. Since the option to invoke an 
affirmative defense was voluntary, there may be a negligible cost 
savings for reporting malfunctions by removing these provisions.

D. What are the economic impacts?

    There are no economic impacts associated with this action. The 
affirmative defense provisions did not affect the stringency of the 
standards in 40 CFR part 63, subparts HH or HHH. The removal of the 
provisions does not have a material impact on the obligation for 
sources to comply with current existing standards, or the ability of 
Federal or State agencies to enforce standards. The EPA estimated a 
small administrative burden to report deviations from standards as a 
result of malfunctions that included the option for an owner or 
operator to offer an affirmative defense. The removal of the 
affirmative defense provisions does not affect that burden because 
sources will still be required to report malfunctions that could have 
resulted in a failure to meet the standards. Since the option to invoke 
an affirmative defense was voluntary, there may be a negligible cost 
savings for reporting malfunctions by removing these provisions.

E. What are the benefits?

    There are no environmental benefits associated with this action. 
The affirmative defense provisions did not affect the stringency of the 
standards in 40 CFR part 63, subparts HH or HHH. The removal of the 
provisions does not have a material impact on the obligation for 
sources to comply with current existing standards, or the ability of 
Federal or State agencies to enforce standards.

IV. Statutory and Executive Order Reviews

    Additional information about these statutes and Executive Orders 
can be found at https://www.epa.gov/laws-regulations/laws-and-executive-orders.

A. Executive Order 12866: Regulatory Planning and Review and Executive 
Order 14094: Modernizing Regulatory Review

    This action is not a significant regulatory action as defined in 
Executive Order 12866, as amended by Executive Order 14094, and was 
therefore not subject to a requirement for review under Executive Order 
12866.

B. Paperwork Reduction Act (PRA)

    This action does not impose any new information collection burden 
under the PRA. OMB has previously approved the information collection 
activities contained in the existing regulations and has assigned OMB 
control number 2060-0417. The removal of provisions for affirmative 
defense does not change any mandatory recordkeeping, reporting, or 
other activity previously established under prior final rules.

C. Regulatory Flexibility Act (RFA)

    I certify that this action will not have a significant economic 
impact on a substantial number of small entities under the RFA. There 
are no economic impacts associated with this action. The affirmative 
defense provisions did not affect the stringency of the standards in 40 
CFR part 63, subparts HH or HHH. The removal of the provisions does not 
have a material impact on the obligation for sources to comply with 
current existing standards, or the ability of Federal or State agencies 
to enforce standards.

D. Unfunded Mandates Reform Act (UMRA)

    This action does not contain any unfunded mandate as described in 
UMRA, 2 U.S.C. 1531-1538, and does not significantly or uniquely affect 
small governments. The action imposes no enforceable duty on any State, 
local or Tribal governments or the private sector.

E. Executive Order 13132: Federalism

    This action does not have federalism implications. It will 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.

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

    This action does not have Tribal implications as specified in 
Executive Order 13175. It 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 
this action.

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

    The EPA interprets Executive Order 13045 as applying only to those 
regulatory actions that concern environmental health or safety risks 
that the EPA has reason to believe may disproportionately affect 
children, per the definition of ``covered regulatory action'' in 
section 2-202 of the Executive order. Therefore, this action is not 
subject to Executive Order 13045 because it does not concern an 
environmental health risk or safety risk. Since this action does not 
concern human health, the EPA's Policy on Children's Health also does 
not apply.

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

    This action is not subject to Executive Order 13211, because it is 
not a significant regulatory action under Executive Order 12866.

I. National Technology Transfer and Advancement Act (NTTAA)

    This rulemaking does not involve technical standards.

J. Executive Order 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Populations and 
Executive Order 14096: Revitalizing our Nation's Commitment to 
Environmental Justice for All

    The EPA believes that this action does not concern human health or 
environmental conditions and therefore cannot be evaluated with respect 
to potentially disproportionate and adverse effects on people of color, 
low-income populations and/or Indigenous peoples. The removal of the 
provisions does not have a material impact on the obligation for 
sources to comply with current existing standards, or the ability of 
Federal or State agencies to enforce standards.

[[Page 83893]]

List of Subjects in 40 CFR Part 63

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

Michael S. Regan,
Administrator.

    For the reasons stated in the preamble, the Environmental 
Protection Agency (EPA) proposes to amend title 40, chapter I, of the 
Code of Federal Regulations (CFR) as follows:

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

0
1. The authority citation for part 63 continues to read as follows:

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

Subpart HH--National Emission Standards for Hazardous Air 
Pollutants From Oil and Natural Gas Production Facilities

0
2. Section 63.760 is amended by adding paragraph (i) to read as 
follows:


Sec.  63.760  Applicability and designation of affected source.

* * * * *
    (i) Emissions standards in this subpart apply at all times.


Sec.  63.761  [Amended]

0
3. Section 63.761 is amended by removing the definition ``Affirmative 
defense''.


Sec.  63.762  [Removed and Reserved]

0
4. Section 63.762 is removed and reserved.

Subpart HHH--National Emission Standards for Hazardous Air 
Pollutants From Natural Gas Transmission and Storage Facilities

0
5. Section 63.1270 is amended by adding paragraph (g) to read as 
follows:


Sec.  63.1270  Applicability and designation of affected source.

* * * * *
    (g) Emissions standards in this subpart apply at all times.


Sec.  63.1271  [Amended]

0
6. Section 63.1271 is amended by removing the definition ``Affirmative 
defense''.


Sec.  63.1272  [Removed and Reserved]

0
7. Section 63.1272 is removed and reserved.

[FR Doc. 2023-26119 Filed 11-30-23; 8:45 am]
BILLING CODE 6560-50-P


