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Rule2026-06837

Air Plan Approval; Colorado; Serious Attainment Plan Contingency Measures and RACT Requirements for the 2008 8-Hour Ozone National Ambient Air Quality Standards for the Denver Metro/North Front Range Nonattainment Area

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Published

April 9, 2026

Effective

May 11, 2026

Issuing agencies

Environmental Protection Agency

Abstract

The Environmental Protection Agency (EPA) is approving state implementation plan (SIP) submittals from the State of Colorado under the Clean Air Act (CAA) that address contingency measures and Reasonably Available Control Technology (RACT) requirements for the 2008 ozone National Ambient Air Quality Standard (NAAQS) for the Denver Metro/North Front Range (DMNFR) Serious ozone nonattainment area. The EPA finds that the State has met the applicable CAA requirements for Serious area contingency measures as well as RACT for certain stationary sources. Accordingly, the EPA is approving the respective SIP revisions to implement the submitted motor vehicle coating contingency measure, but we are not taking action on one of the identified contingency measures included in the submittals that concerns pneumatic controllers. In addition, the EPA is approving regulatory revisions that Colorado adopted to implement RACT requirements for landfill/biogas fired engines, refinery fuel process heaters, and a cold rolling mill, except that we are not taking final action on the RACT requirement for one refinery fuel process heater that was submitted by Colorado due to an identified error. The EPA is taking this action pursuant to the CAA.

Full Text

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<title>Federal Register, Volume 91 Issue 68 (Thursday, April 9, 2026)</title>
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[Federal Register Volume 91, Number 68 (Thursday, April 9, 2026)]
[Rules and Regulations]
[Pages 17857-17863]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2026-06837]

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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 52

[EPA-R08-OAR-2024-0622, EPA-R08-OAR-2025-0233; FRL-12746-05-R8]

Air Plan Approval; Colorado; Serious Attainment Plan Contingency
Measures and RACT Requirements for the 2008 8-Hour Ozone National
Ambient Air Quality Standards for the Denver Metro/North Front Range
Nonattainment Area

AGENCY: Environmental Protection Agency (EPA).

ACTION: Final rule.

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SUMMARY: The Environmental Protection Agency (EPA) is approving state
implementation plan (SIP) submittals from the State of Colorado under
the Clean Air Act (CAA) that address contingency measures and
Reasonably Available Control Technology (RACT) requirements for the
2008 ozone National Ambient Air Quality Standard (NAAQS) for the Denver
Metro/North Front Range (DMNFR) Serious ozone nonattainment area. The
EPA finds that the State has met the applicable CAA requirements for
Serious area contingency measures as well as RACT for certain
stationary sources. Accordingly, the EPA is approving the respective
SIP revisions to implement the submitted motor vehicle coating
contingency measure, but we are not taking action on one of the
identified contingency measures included in the submittals that
concerns pneumatic controllers. In addition, the EPA is approving
regulatory revisions that Colorado adopted to implement RACT
requirements for landfill/biogas fired engines, refinery fuel process
heaters, and a cold rolling mill, except that we are not taking final
action on the RACT requirement for one refinery fuel process heater
that was submitted by Colorado due to an identified error. The EPA is
taking this action pursuant to the CAA.

DATES: This rule is effective on May 11, 2026.

ADDRESSES: The EPA has established dockets for the contingency measures
and RACT requirements for this action under Docket ID No. EPA-R08-OAR-
2024-0622 and EPA-R08-OAR-2025-0233, respectively. All documents in the
dockets are listed on the <a href="https://www.regulations.gov">https://www.regulations.gov</a> website. Although
listed in the index, some information is not publicly available, e.g.,
Confidential Business Information (CBI) or other information whose
disclosure is restricted by statute. Certain other material, such as
copyrighted material, is not placed on the internet and will be
publicly available only in hard copy form. Publicly available docket
materials are available through <a href="https://www.regulations.gov">https://www.regulations.gov</a>, or please
contact the person identified in the FOR FURTHER INFORMATION CONTACT
section for additional availability information.

FOR FURTHER INFORMATION CONTACT: Matthew Lang, Air and Radiation
Division, EPA, Region 8, Mailcode 8ARD-IO, 1595 Wynkoop Street, Denver,
Colorado, 80202-1129, telephone number: (303) 312-6709, email address:
<a href="/cdn-cgi/l/email-protection#d6bab7b8b1f8bbb7a2a2beb3a196b3a6b7f8b1b9a0"><span class="__cf_email__" data-cfemail="c4a8a5aaa3eaa9a5b0b0aca1b384a1b4a5eaa3abb2">[email&#160;protected]</span></a>.

SUPPLEMENTARY INFORMATION: Throughout this document ``we,'' ``us,'' and
``our'' means the EPA.

I. Background

The background for this action is discussed in detail in our May 8,
2025 and June 18, 2025 proposals.\1\ In the document published May 8,
2025, we proposed to approve SIP revisions submitted by Colorado on
June 26, 2023, May 23, 2024, and April 2, 2025. These revisions were
submitted, in part, to meet the contingency measures requirements of
CAA sections 172(c)(9) and 182(c)(9) through adoption of requirements
for automotive coating facilities and inclusion of an infeasibility
justification for adoption of contingency measures providing for
emission reductions of less than one year's worth of progress. In the
proposed rulemaking published on June 18, 2025, we proposed to approve
SIP revisions submitted by Colorado on June 26, 2023, May 23, 2024, May
30, 2024, and April 2, 2025. These revisions were submitted, in part,
to meet the RACT requirement of CAA sections 172(c)(1) and 182(b)(2)
through adoption of requirements for landfill/biogas fired engines,
refinery fuel process heaters, and a cold rolling mill. The EPA also

[[Page 17858]]

issued interim final determinations concurrently with the May 8, 2025
and June 18, 2025 proposed approvals of Colorado's contingency measures
and RACT SIP submissions to stay and defer sanctions pending from the
EPA's prior disapproval actions for the two requirements.\2\
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\1\ See 90 FR 19447 and 90 FR 25960, respectively.
\2\ See 90 FR 19424 and 90 FR 25901, respectively.
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II. Response to Comments

We received comments on the May 8, 2025 proposal and the
accompanying interim final determination from the following commenters:
(1) the Center for Biological Diversity (CBD), the Colorado Sierra
Club, and Public Employees for Environmental Responsibility in a
comment letter submitted jointly (herein referred to as CBD comments),
and (2) an anonymous public commenter. We also received comments on the
June 18, 2025 proposal and associated interim final determination from
the following three commenters: two anonymous public commenters and
from Suncor Energy. All comments received are located in the two
dockets for this action listed above.
Concerning the May 8, 2025 proposal, the anonymous public comment
is not directed to the proposed SIP revisions addressed in this
rulemaking, and therefore the EPA is not responding to it. The comments
from CBD raise concerns related to our proposed action on Colorado's
contingency measures SIP submittal, including the associated
infeasibility justification, and claim that the submittal does not
satisfy the requirements of CAA sections 172(c)(9) and 182(c)(9). As to
the June 18, 2025 proposal, one of the anonymous public comments is not
relevant to the RACT requirements at issue in the proposed rule and the
EPA is not responding to it. The other anonymous comment discusses
requirements for cement production process heaters generally and is not
specific to RACT for refinery fuel-fired process heaters addressed by
the proposed rule. The comment on the June 18, 2025 proposal from
Suncor Energy identifies an error in the associated regulatory
revisions submitted by the State of Colorado. A summary of the comments
on the May 8, 2025 and June 18, 2025 actions that are relevant to this
final action and the EPA's responses are provided in the Response to
Comments document, which is located in the rulemaking dockets for this
action.

III. Final Action

The EPA is finalizing approval of Colorado's SIP revisions related
to the contingency measures requirement because we find that they
satisfy CAA sections 172(c)(9) and 182(c)(9) for the DMNFR Serious
ozone nonattainment area with respect to the 2008 ozone NAAQS. This
includes approval of the adopted automotive coatings contingency
measure, the infeasibility justification, and associated regulatory
revisions to Regulation 7 (Reg. 7) and Regulation 25 (Reg. 25)
identified in the May 8, 2025 proposed rule. The EPA is also finalizing
approval of the majority of Colorado's SIP revisions related to the
RACT requirement because we find that they satisfy CAA sections
172(c)(1) and 182(b)(2). This includes approval of regulatory
requirements for landfill/biogas fired engines, refinery fuel process
heaters, and a cold rolling mill located in Colorado's Reg. 7 and
Regulation 26 (Reg. 26) detailed in the June 18, 2025 proposed rule.
Specifically, the EPA is finalizing approval of the regulatory
revisions identified in table 1 in this document (below) for which we
proposed approval in the May 8, 2025 and June 18, 2025 proposed rules.
As described in the EPA's June 18, 2025 proposed rule,\3\ the EPA
is not taking action on the addition to Reg. 7, Part E, section II.A.4.
from the June 26, 2023 SIP submittal that concerns the May 1, 2024
compliance date for equipment specified under sections II.A.1.d.-e. The
EPA will propose action on the associated revision to section II.A.4.
concurrently with the revisions to sections II.A.1.d.-e. in a future
action.
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\3\ See 90 FR 25960 at footnote 21.
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The EPA is also not finalizing approval of revisions to Reg. 7,
Part A, sections I.A.1.a., I.B.2.a.(iii), I.B.2.d., and I.B.2.d.(iii)-
(iv), as well as the corresponding language in Reg. 25, Part A,
sections I.A.1.a., I.B.2.a.(iii), I.B.2.d., and I.B.2.d.(iii)-(iv),
which we had proposed approval of in our May 8, 2025 proposed rule. The
revisions to these sections relate to the portion of northern Weld
County which is included in the DMNFR nonattainment area for the 2015
ozone NAAQS but is not included within the DMNFR nonattainment area for
the 2008 ozone NAAQS. As such, it is unnecessary to finalize our
approval of the revisions referenced above in this action concerning
contingency measures and RACT requirements for the Serious
classification of the DMNFR nonattainment area for the 2008 ozone
NAAQS. The EPA intends to address these revisions in a separate action
at a later date.

Table 1--Summary of EPA's Final Approval of Revisions to Regulations 7,
25, and 26
------------------------------------------------------------------------
Revisions included in the EPA's
Submittal final approval
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June 26, 2023..................... Reg. 7, Part A, sections I.B.2.a.(i)-
(ii), I.B.2.c, I.B.2.e., II.A.13-
18, II.C.1; Reg. 7, Part C,
sections I.A.3.a., I.P; Reg. 7,
Part E, sections I.D.4.a.(i)(B),
II, II.A.4 (partial approval),
II.A.4.a.(vii), II.A.4.b.(ii),
II.A.5.a.(i), II.A.5.b.(i)(A)(2)-
(3), II.A.5.b.(i)(B)(1)-(2),
II.A.5.b.(ii)(A),
II.A.5.b.(ii)(B)(1)-(2),
II.A.5.b.(ii)(B)(6)-(7),
II.A.5.b.(ii)(D)-(E), II.A.6.a.(i)-
(ii), II.A.6.b.(viii)(F)-(G),
II.A.6.c.(ii), II.A.7.f.(iii),
V.A.6.b.
May 23, 2024...................... Reg. 7, Part C, section I.P; removal
of Reg. 7, Part E; Reg. 25, Part A;
Reg. 25, Part B, sections I.A.,
I.P.; Reg. 25 appendix D-E; Reg.
26, Part A; Reg. 26, Part B.
May 30, 2024...................... Reg. 26, Part A, section I.C, Reg.
26; Part B, sections I.C.1.,
II.A.4.f, II.A.5.b.(ii)(E)-(F),
II.A.7.h, II.A.8.b.(i), V.A.1.a.

[[Page 17859]]

April 2, 2025..................... Reg. 25, Part A, section II.C.2.;
Reg. 25, Part B, sections I.P.1.b.,
I.P.3., I.P.4.b., I.P.7.a.,
I.P.7.a.(vi), I.P.7.b., I.P.8; Reg.
26, Part B, sections II.A.4.,
II.A.4.g.(i), II.A.4.g.(iv)-(v),
II.A.5.a.(iii), II.A.5.b.(i)(A),
II.A.5.b.(ii)(B)(1), IX.
------------------------------------------------------------------------
Note: At this time, the EPA is not finalizing action on any of the
revisions included in the June 26, 2023, May 23, 2024, May 30, 2024,
and April 2, 2025 submittals besides those identified in table 1. This
means that there are revisions to Reg. 7, Part E included as part of
the June 26, 2023 submittal which will not yet be incorporated into
the SIP as part of the newly established Reg. 26. Additionally, and as
described previously, the EPA is not finalizing approval of the June
26, 2023 revisions to Reg. 7, Part A, sections I.A.1.a.,
I.B.2.a.(iii), I.B.2.d., and I.B.2.d.(iii)-(iv) concerning northern
Weld County, as well as the corresponding language in the newly
established Reg. 25, Part A, sections I.A.1.a., I.B.2.a.(iii),
I.B.2.d., and I.B.2.d.(iii)-(iv). The EPA will act on these revisions
and their incorporation into the SIP within Regulations 25 and 26 in a
future action. With regards to the revisions to Reg. 26, Part B,
section II.A.4.g.(iv), the EPA is not finalizing approval of the
language included in table 3 of section II.A.4.g.(iv) concerning
process heater H-1717 due to an identified error in that table.
Finally, those sections marked as ``state-only'' in Colorado's SIP
submittals are not included for incorporation into the SIP. Therefore,
the EPA is not finalizing action on these sections, and any such
sections which were relocated from Reg. 7 to Reg. 25 or Reg. 26 will
continue to be ``state-only.''

In this final action EPA is not acting upon that portion of the SIP
submission that incorporates heater H-1717 due to an error that was
identified in the regulatory revisions submitted by the State of
Colorado on April 2, 2025, concerning RACT determinations for
individual refinery fuel process heaters. Colorado's technical support
documentation accompanying its RACT determinations for process heaters,
as well as the EPA's proposed rule, make clear that Colorado determined
that additional controls were not technologically or economically
feasible for all refinery fuel process heaters.\4\ Colorado therefore
adopted revisions at Reg. 26, Part B, section II.A.4.g.(iv) to identify
the existing emission controls that were determined to represent RACT
for individual units. For the process heater designated H-1717, the
existing emission control was inadvertently listed as operation of
ultra-low NO<INF>X</INF> burners. However, heater H-1717 is equipped
with low NO<INF>X</INF> burners as shown in Colorado's supporting
technical documentation at table 5 \5\ and Colorado's analysis of
economic infeasibility of ultra-low NO<INF>X</INF> burner or Selective
Catalytic Reduction (SCR) retrofit, as summarized in tables 8 and 9 of
the State's analysis, demonstrates the lack of additional feasible
emission controls available for the unit.\6\ In our proposed rule, the
EPA concurred with Colorado's rejection of burner retrofits and SCR for
heater H-1717 on the basis of economic infeasibility, highlighting that
the EPA correctly evaluated Colorado's RACT determination despite the
error in the submitted regulatory revisions.\7\ However, due to the
identified error, the EPA is not finalizing our proposed approval for
RACT concerning process heater H-1717. We are also not finalizing
approval of the language included in table 3 of the revision to Reg.
26, Part B, section II.A.4.g.(iv) concerning heater H-1717. The EPA
intends to take action to approve RACT for heater H-1717 when the
corrected rule text is submitted to the EPA by Colorado for
incorporation into the SIP. The SIP's inclusion of inaccurate existing
burner technology for process heater H-1717 in table 3 of Reg. 26, Part
B, section II.A.4.g.(iv) does not affect our approval of Colorado's
RACT SIP submittal for all other identified process heaters besides
heater H-1717. To be clear, the EPA is not disapproving Colorado's SIP
submission concerning process heater H-1717. Rather, because of the
identified error in the State's submission, we are not acting upon that
portion of the submission, and intend to approve an anticipated, future
submission from Colorado that corrects the error.
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\4\ See April 2, 2025 SIP Submittal, Document Set 1 of 2,
``Technical Support Document for Reasonably Available Control
Technology for Major Sources'' at 26-27 and 29-32, available in
Docket ID No. EPA-R08-OAR-2025-0233. See also 90 FR 25960 at 25964
and 25966.
\5\ Id. at 18.
\6\ Id. at 29-32.
\7\ See 90 FR 25960 at 25964 and 25966.
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Because the EPA is now finalizing approval of the portions of
Colorado's SIP submittals that correct the prior contingency measure
disapproval, the associated sanctions from EPA's November 7, 2023 are
now fully relieved. The EPA is also finalizing approval of RACT
requirements for landfill/biogas engines and a cold rolling mill and is
determining that our prior December 8, 2023 disapproval concerning
these specific sources is now resolved. Concerning RACT requirements
for refinery fuel process heaters that were included in the EPA's
December 8, 2023 disapproval, the EPA is finalizing our proposed
approval that Colorado has adopted RACT for all of the affected units
except for process heater H-1717 due to the identified error in
Colorado's submitted regulatory language. Therefore, our December 8,
2023 disapproval concerning RACT and associated deferred sanctions will
not be fully resolved until EPA receives and takes final action
concerning RACT for heater H-1717. To be clear, the interim final
determination issued June 18, 2025 remains in effect with sanctions
deferred pending EPA action on an anticipated error correction to be
submitted by Colorado.

IV. Incorporation by Reference

In this document, the EPA is finalizing regulatory text that
includes incorporation by reference. In accordance with requirements of
1 CFR 51.5, the EPA is finalizing the incorporation by reference of
Colorado Air Quality Control Commission Reg. 7 pertaining to the
``Control of Ozone via Ozone Precursors and Control of Hydrocarbons via
Oil and Gas Emissions (Emissions of Volatile Organic Compounds &
Nitrogen Oxides),'' Reg. 25 pertaining to the ``Control of Emissions
from Surface Coating, Solvents, Asphalt, Graphic Arts and Printing, and
Pharmaceuticals,'' and Reg. 26 pertaining to the ``Control of Emissions
from Engines and Major Stationary Sources'' (as listed in table 1 above
and discussed in section III.). The EPA has made, and will continue to
make, these materials generally available through <a href="https://www.regulations.gov">https://www.regulations.gov</a> and at the EPA Region 8 Office (please contact the
person identified in the FOR FURTHER INFORMATION CONTACT section of
this preamble for more information). Therefore, these materials have
been approved by the EPA for inclusion in the SIP, have been
incorporated by reference by the EPA into that plan, are fully
federally enforceable under sections 110 and 113 of the CAA as of the
effective date of the final rulemaking of the EPA's approval, and will
be incorporated by reference in the next update to the SIP
compilation.\8\
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\8\ 62 FR 27968 (May 22, 1997).

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[[Page 17860]]

V. Statutory and Executive Order Reviews

Under the CAA, the Administrator is required to approve a SIP
submission that complies with the provisions of the Act and applicable
Federal regulations. 42 U.S.C. 7410(k); 40 CFR 52.02(a). Thus, in
reviewing SIP submissions, the EPA's role is to approve state choices,
provided that they meet the criteria of the CAA. Accordingly, this
action merely approves state law as meeting Federal requirements and
does not impose additional requirements beyond those imposed by state
law. For that reason, this action:
<bullet> Is not a significant regulatory action subject to review
by the Office of Management and Budget under Executive Order 12866 (58
FR 51735, October 4, 1993);
<bullet> Is not subject to Executive Order 14192 (90 FR 9065,
February 6, 2025) because SIP actions are exempt from review under
Executive Order 12866;
<bullet> Does not impose an information collection burden under the
provisions of the Paperwork Reduction Act (44 U.S.C. 3501 et seq.);
<bullet> Is certified as not having a significant economic impact
on a substantial number of small entities under the Regulatory
Flexibility Act (5 U.S.C. 601 et seq.);
<bullet> Does not contain any unfunded mandate or significantly or
uniquely affect small governments, as described in the Unfunded
Mandates Reform Act of 1995 (Pub. L. 104-4);
<bullet> Does not have federalism implications as specified in
Executive Order 13132 (64 FR 43255, August 10, 1999);
<bullet> Is not subject to Executive Order 13045 (62 FR 19885,
April 23, 1997) because it approves a state program;
<bullet> Is not a significant regulatory action subject to
Executive Order 13211 (66 FR 28355, May 22, 2001); and
<bullet> Is not subject to requirements of section 12(d) of the
National Technology Transfer and Advancement Act of 1995 (15 U.S.C. 272
note) because application of those requirements would be inconsistent
with the CAA.
In addition, the SIP is not approved to apply on any Indian
reservation land or in any other area where the EPA or an Indian Tribe
has demonstrated that a Tribe has jurisdiction. In those areas of
Indian country, the rule does not have Tribal implications and will not
impose substantial direct costs on Tribal governments or preempt Tribal
law as specified by Executive Order 13175 (65 FR 67249, November 9,
2000).
This action is subject to the Congressional Review Act (CRA), and
EPA will submit a rule report to each House of the Congress and to the
Comptroller General of the United States. This action is not a ``major
rule'' as defined by 5 U.S.C. 804(2).
Under section 307(b)(1) of the CAA, petitions for judicial review
of this action must be filed in the United States Court of Appeals for
the appropriate circuit by June 8, 2026. Filing a petition for
reconsideration by the Administrator of this final rule does not affect
the finality of this action for the purposes of judicial review nor
does it extend the time within which a petition for judicial review may
be filed, and shall not postpone the effectiveness of such rule or
action. This action may not be challenged later in proceedings to
enforce its requirements (see section 307(b)(2)).

List of Subjects in 40 CFR Part 52

Environmental protection, Air pollution control, Ammonia, Carbon
oxides, Incorporation by reference, Intergovernmental relations, Lead,
Nitrogen oxides, Ozone, Particulate matter, Reporting and recordkeeping
requirements, Sulfur oxides, Volatile organic compounds.

Dated: March 31, 2026.
Cyrus M. Western,
Regional Administrator, Region 8.

For the reasons stated in the preamble, the Environmental
Protection Agency is amending 40 CFR part 52 as follows:

PART 52--APPROVAL AND PROMULGATION OF IMPLEMENTATION PLANS

0
1. The authority citation for part 52 continues to read as follows:

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

Subpart G--Colorado

0
2. In Sec. 52.320:
0
a. In the table in paragraph (c):
0
i. Under the center heading ``5 CCR 1001-09, Regulation Number 7,
Control of Ozone Via Ozone Precursors and Hydrocarbons via Oil and Gas
Emissions, (Emissions of Volatile Organic Compounds and Nitrogen
Oxides), Part A, Applicability and General Provisions'', revise the
entries ``I. Applicability'' and ``II. General Provisions''.
0
ii. Under the center heading ``5 CCR 1001-09, Regulation Number 7,
Control of Ozone Via Ozone Precursors and Hydrocarbons via Oil and Gas
Emissions, (Emissions of Volatile Organic Compounds and Nitrogen
Oxides), Part C, Surface Coating, Solvents, Asphalt, Graphic Arts and
Printing, and Pharmaceuticals'', revise the entry ``I. Surface Coating
Operations''.
0
iii. Removing the center heading ``5 CCR 1001-09, Regulation Number 7,
Control of Ozone Via Ozone Precursors and Hydrocarbons via Oil and Gas
Emissions, (Emissions of Volatile Organic Compounds and Nitrogen
Oxides), Part E, Combustion Equipment and Major Source RACT'' and the
entries ``I. Control of Emissions from Engines'', ``II. Control of
Emissions from Stationary and Portable Engines and Other Combustion
Equipment in the 8-Hour Ozone Control Area'', ``III. Control of
Emissions from Specific Major Sources of VOC and/or NO<INF>X</INF> in
the 8-Hour Ozone Control Area'', and ``IV. Control of Emissions from
Breweries in the 8-hour Ozone Control Area''.
0
iv. Add the center heading ``5 CCR 1001-29 Regulation Number 25,
Control of Emissions From Surface Coating, Solvents, Asphalt, Graphic
Arts and Printing, and Pharmaceuticals, Part A, Applicability and
General Provisions'' and the entries ``I. Applicability'' and ``II.
General Provisions'' at the end of the table.
0
v. Add the center heading ``5 CCR 1001-29 Regulation Number 25, Control
of Emissions From Surface Coating, Solvents, Asphalt, Graphic Arts and
Printing, and Pharmaceuticals, Part B, Surface Coating, Solvents,
Asphalt, Graphic Arts and Printing, and Pharmaceuticals'' and the
entries ``I. Surface Coating Operations'', ``Appendix D Minimum Cooling
Capacities for Refrigerated Freeboard Chillers on Vapor Degreasers'',
and ``Appendix E Emission Limit Conversion Procedure'' at the end of
the table.
0
vi. Add the center heading ``5 CCR 1001-30 Regulation Number 26,
Control of Emissions from Engines and Major Stationary Sources, Part A,
Applicability and General Provisions'' and the entry ``I. General
Provisions'' at the end of the table.
0
vii. Add the center heading ``5 CCR 1001-30 Regulation Number 26,
Control of Emissions from Engines and Major Stationary Sources, Part B,
Combustion Equipment and Major Source RACT'' and the entries ``I.
Control of Emissions from Engines'', ``II. Control of Emissions from
Stationary and Portable Combustion Equipment in the 8-Hour Ozone
Control Area or Northern Weld County'', ``III. Control of Emissions
from Specific Major Sources of VOC and/or NO<INF>X</INF> in the 8-Hour
Ozone Control Area'', ``IV. Control of Emissions from Breweries in the
8-hour Ozone Control Area'', ``V. Control of Emissions from

[[Page 17861]]

Foam Manufacturing in the 8-hour Ozone Control Area'', and ``IX.
Control of Emissions from Cold Rolling Mills'' at the end of the table.
0
b. In the table in paragraph (e):
0
i. Under the center heading ``Maintenance and Attainment Plan
Elements'', add the entries ``Contingency Measures for the 2008 8-Hour
Ozone National Ambient Air Quality Standard (NAAQS) Serious State
Implementation Plan (Contingency Measures SIP)'' and ``Landfill/biogas
fired engine, refinery fuel process heater, and cold rolling mill RACT
for the 2008 8-Hour Ozone National Ambient Air Quality Standard (NAAQS)
Serious State Implementation Plan'' after the entry titled ``Ozone (8-
hour, 2015) DMNFR 2017 Base Year Inventory''.
The revisions and additions read as follows:

Sec. 52.320 Identification of plan.

* * * * *
(c) * * *

----------------------------------------------------------------------------------------------------------------
State EPA effective Final rule citation/
Title effective date date date Comments
----------------------------------------------------------------------------------------------------------------

* * * * * * *
I. Applicability................. 2/14/2023 05/11/2026 91 FR [insert State-only provisions
Federal Register excluded. Previous SIP
page where the approval 8/5/11.
document begins], Nonsubstantive changes
4/9/2026. approved 7/3/2018, 2/24/
2021, and 11/5/2021.
Revisions to I.A.1.a.,
I.B.2.a.(iii),
I.B.2.d., and
I.B.2.d.(iii)-(iv)
excluded from approval
dated 4/9/2026 insofar
as related to northern
Weld County. Revisions
to I.A.1.c., I.B.1.a.,
I.B.1.c., I.B.1.d.,
I.B.2.h. and I.B.2.i.
excluded from approval
dated 4/9/2026.
II. General Provisions........... 2/14/2023 05/11/2026 91 FR [insert State-only provisions
Federal Register excluded. Previous SIP
page where the approval 8/5/11.
document begins], Nonsubstantive changes
4/9/2026. approved 2/24/2021 and
11/5/2021. Appendix A
excluded.
----------------------------------------------------------------------------------------------------------------

* * * * * * *
----------------------------------------------------------------------------------------------------------------
5 CCR 1001-09, Regulation Number 7, Control of Ozone Via Ozone Precursors and Hydrocarbons via Oil and Gas
Emissions, (Emissions of Volatile Organic Compounds and Nitrogen Oxides), Part C, Surface Coating, Solvents,
Asphalt, Graphic Arts and Printing, and Pharmaceuticals
----------------------------------------------------------------------------------------------------------------
I. Surface Coating Operations.... 6/14/2023 05/11/2026 91 FR [insert Previous SIP approval 8/
Federal Register 5/2011; nonsubstantive
page where the changes approved 7/3/
document begins], 2018; substantive
4/9/2026. changes approved 2/24/
2021; nonsubstantive
changes approved 11/5/
2021. Substantive
changes limited
approval/disapproval 5/
9/2023. Revisions to
I.L.4.b., I.L.4.d.,
I.N.7. and I.O.2.
excluded from approval
dated 4/9/2026.

* * * * * * *
----------------------------------------------------------------------------------------------------------------
5 CCR 1001-29 Regulation Number 25, Control of Emissions From Surface Coating, Solvents, Asphalt, Graphic Arts
and Printing, and Pharmaceuticals, Part A, Applicability and General Provisions
----------------------------------------------------------------------------------------------------------------
I. Applicability................. 6/14/2023 05/11/2026 91 FR [insert State-only provisions
Federal Register excluded. I.A.1.a.,
page where the I.B.2.a.(iii),
document begins], I.B.2.d., and
4/9/2026. I.B.2.d.(iii)-(iv)
excluded from approval
dated 4/9/2026 insofar
as related to northern
Weld County.
II. General Provisions........... 2/14/2025 05/11/2026 91 FR [insert State-only provisions
Federal Register excluded. II.E., II.F.,
page where the and appendix A
document begins], excluded.
4/9/2026.
----------------------------------------------------------------------------------------------------------------
5 CCR 1001-29 Regulation Number 25, Control of Emissions From Surface Coating, Solvents, Asphalt, Graphic Arts
and Printing, and Pharmaceuticals, Part B, Surface Coating, Solvents, Asphalt, Graphic Arts and Printing, and
Pharmaceuticals
----------------------------------------------------------------------------------------------------------------
I. Surface Coating Operations.... 2/14/2025 05/11/2026 91 FR [insert I.B. through I.O.
Federal Register excluded pending move
page where the from Regulation 7.
document begins],
4/9/2026.
Appendix D Minimum Cooling 6/14/2023 05/11/2026 91 FR [insert
Capacities for Refrigerated Federal Register
Freeboard Chillers on Vapor page where the
Degreasers. document begins],
4/9/2026.

[[Page 17862]]

Appendix E Emission Limit 6/14/2023 05/11/2026 91 FR [insert
Conversion Procedure. Federal Register
page where the
document begins],
4/9/2026.
----------------------------------------------------------------------------------------------------------------
5 CCR 1001-30 Regulation Number 26, Control of Emissions from Engines and Major Stationary Sources, Part A,
Applicability and General Provisions
----------------------------------------------------------------------------------------------------------------
I. General Provisions............ 2/14/2024 05/11/2026 91 FR [insert Appendix A excluded.
Federal Register
page where the
document begins],
4/9/2026.
----------------------------------------------------------------------------------------------------------------
5 CCR 1001-30 Regulation Number 26, Control of Emissions from Engines and Major Stationary Sources, Part B,
Combustion Equipment and Major Source RACT
----------------------------------------------------------------------------------------------------------------
I. Control of Emissions from 2/14/2024 05/11/2026 91 FR [insert State-only provisions
Engines. Federal Register excluded. I.D.4.c.
page where the excluded from approval
document begins], dated 4/9/2026.
4/9/2026.
II. Control of Emissions from 2/14/2025 05/11/2026 91 FR [insert State-only provisions
Stationary and Portable Federal Register excluded. II.A.1.c.-e.,
Combustion Equipment in the 8- page where the II.A.4. (4th
Hour Ozone Control Area or document begins], paragraph),
Northern Weld County. 4/9/2026. II.A.4.a.(v)-(vi),
portions of II.A.4.d.
and II.A.4.d.(i),
II.A.4.d.(ii)-(iii),
II.A.4.e.(ii),
II.A.4.g.(iii), Row 4
of table 3 in
II.A.4.g.(iv),
II.A.5.a.(iv)-(v),
II.A.5.b.(ii)(B)(5),
II.A.5.b.(ii)(C),
II.A.6.a.(iii)-(v),
II.A.6.b.(viii)(C)-(E),
and II.A.8.c. excluded
from approval dated 4/9/
2026.
III. Control of Emissions from 6/14/2023 05/11/2026 91 FR [insert III.C. excluded from
Specific Major Sources of VOC Federal Register approval dated 4/9/
and/or NOX in the 8-Hour Ozone page where the 2026.
Control Area. document begins],
4/9/2026.
IV. Control of Emissions from 6/14/2023 05/11/2026 91 FR [insert
Breweries in the 8-hour Ozone Federal Register
Control Area. page where the
document begins],
4/9/2026.
V. Control of Emissions from Foam 2/14/2024 05/11/2026 91 FR [insert V.A.1.b., portion of
Manufacturing in the 8-hour Federal Register V.A.4.a., and V.A.8.b.
Ozone Control Area. page where the excluded from approval
document begins], dated 4/9/2026.
4/9/2026.
IX. Control of Emissions from 2/14/2025 05/11/2026 91 FR [insert
Cold Rolling Mills. Federal Register
page where the
document begins],
4/9/2026.
----------------------------------------------------------------------------------------------------------------

* * * * *
(e) * * *

* * * * * * *
----------------------------------------------------------------------------------------------------------------
Maintenance and Attainment Plan Elements
----------------------------------------------------------------------------------------------------------------

* * * * * * *
----------------------------------------------------------------------------------------------------------------
Denver Metropolitan Area
----------------------------------------------------------------------------------------------------------------

* * * * * * *
Contingency Measures for the 2008 2/14/2025 05/11/2026 91 FR [insert Federal Approval of
8-Hour Ozone National Ambient Air Register page where previously
Quality Standard (NAAQS) Serious the document disapproved element.
State Implementation Plan begins], 4/9/2026.
(Contingency Measures SIP).
Landfill/biogas fired engine, 2/14/2025 05/11/2026 91 FR [insert Federal Excluding process
refinery fuel process heater, and Register page where heater H-1717 due to
cold rolling mill RACT for the the document identified error in
2008 8-Hour Ozone National begins], 4/9/2026. Colorado's
Ambient Air Quality Standard submission.
(NAAQS) Serious State
Implementation Plan.

[[Page 17863]]

* * * * * * *
----------------------------------------------------------------------------------------------------------------

[FR Doc. 2026-06837 Filed 4-8-26; 8:45 am]
BILLING CODE 6560-50-P

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