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Federal Register / Vol. 86, No. 117 / Tuesday, June 22, 2021 / Proposed Rules
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provide for the lowest emission limitation through application of control techniques that are reasonably available considering technological and economic feasibility. Therefore, we propose to find that the control requirements for the source categories identified in Table 3 are RACT for all affected sources in the DMNFR Area under the 2008 8-hour ozone NAAQS.
VI. The EPAs Evaluation of SIP Control Measures in Reg. 7
We evaluated Colorados May 14, 2018, May 8, 2019, and May 13, 2020
submittals regarding revisions to the States Reg. 7 to meet RACT
requirements for various source categories. Revisions to Reg. 7 include expansion of categorical combustion equipment requirements; incorporation by reference of certain NSPS and NESHAP requirements for engines and landfill gas flares; RACT analysis requirements for specified facilities and/
or emission points; emission control requirements for general solvent use;
and updated requirements for gasoline transport truck testing and vapor control systems. The revisions establish RACT
requirements for the oil and gas CTG
category and emission points at major sources of VOC and NOX in the DMNFR
Area. Reg. 7 revisions also add incorporation by reference dates to rules and reference methods; reorganize and renumber the regulation; and correct typographical, grammatical, and formatting errors. For ease of review, Colorado submitted the full text of Reg.
7 as SIP revisions with the exception of provisions designated State Only.
The EPA is only seeking comment on Colorados proposed substantive changes to the SIP-approved version of Reg. 7, which are described below. We are not seeking comment on incorporation into the SIP of the revised portions of the regulation that were previously approved into the SIP and have not been substantively modified by the State as part of any of these submittals.
As noted above, Colorado designated various parts of Reg. 7 State Only, and in Section I.A.1.c indicated that sections designated State Only are not federally enforceable. The EPA concludes that provisions designated State Only have not been submitted for the EPAs approval, but for informational purposes. Hence, the EPA is not proposing to act on the portions of Reg.
7 designated State Only, and this proposed rule does not discuss them further except as relevant to discussion of the portions of the regulation that Colorado intended to be federally enforceable.

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A. Evaluation
i Section XII.B.

1. May 14, 2018 SIP Submittal
Section XII.B. contains definitions specific to oil and gas operations in Section XII. New definitions were added for approved instrument monitoring method, centrifugal compressor, component, connector, custody transfer, infra-red camera, natural gas compressor station, natural gasdriven diaphragm pump, natural gas processing plant, reciprocating compressor, and well production facility. The definitions are clear, straightforward, and accurate.

The States May 14, 2018 SIP
submittal contains amendments to Reg.
7, Sections II.B., XII and XVIII to meet RACT for oil and gas sources covered by the EPAs 2016 Oil and Gas CTG. The submittal also includes clarifying revisions and typographical, grammatical, and formatting corrections throughout Reg. 7. We propose to approve the revisions to Sections XII
and XVIII included in Colorados May 14, 2018 submittal as identified in Table 5. All remaining Sections of the May 14, 2018 submittal were approved with our February 24, 2021 action.44 Below, we describe in detail Colorados proposed revisions and the basis for our proposed approval of them. Additional analysis on how revisions meet RACT
requirements can be found in the TSD
for this action.
a. Section II
Section II includes general provisions for Reg. 7. The revisions to Section II.B.
clarify that the Section XII.L.
hydrocarbon threshold and Section XVIII natural gas emission standards serve as VOC indicators and that the SIP
does not regulate hydrocarbon emissions.
We propose to find that the revisions clarify Sections XII.L., XVIII.C.1. and XVIII.C.2. and are consistent with CAA
requirements and CTGs. We therefore propose to approve the changes in Section II.B.
b. Section XII
Section XII regulates VOC emissions from, and establishes RACT for, oil and gas operations. Section XII applies to operations that involve the collection, storage, or handling of condensate in the DMNFR Area. Changes to Sections XII.A. through XII.D. and XII.F. through XII.F.L. include addition of definitions for terms used in oil and gas operations;
clarifications to Colorados ozone season; updates to the leak detection and repair program; new provisions for centrifugal and reciprocating compressors, natural gas driven diaphragm pumps, and fugitive emissions at well production facilities and natural gas compressor stations; and minor clerical 45 revisions that do not affect the substance of the requirements.
44 86

FR 11125 Feb. 24, 2021.
we describe changes as clerical in this proposed action, we are referring to changes like section renumbering; alphabetizing of definitions;
minor grammatical, editorial, and typographical revisions; and changes in capitalization.
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ii Section XII.C.1.
Section XII.C.1. includes provisions that are generally applicable to Section XII. Section XII.C.1.e.iv adds a new requirement for combustion devices installed on or after January 1, 2018 and used to comply with Sections XII.J. or XII.K. to be equipped with an operational auto-igniter upon installation. We propose to find that the revisions to Section XII.C.1. meet CAA
and RACT requirements, and that they strengthen the SIP.
iii Section XII.G.
Section XII.G. includes requirements for natural gas-processing plants in the 8-hour Ozone Control Area. Section XII.G.1. updates the leak detection and repair LDAR program applicable to equipment leaks at natural gas processing plants in the DMNFR Area by requiring owners or operators to comply with 40 CFR part 60 NSPS, Subparts OOOO or OOOOa, instead of complying with NSPS Subpart KKK, which is an earlier NSPS and less stringent. Subpart KKK requires sources to implement a NSPS Subpart VV level LDAR program, while Subpart OOOO
requires sources to implement a NSPS
Subpart VVa level LDAR program. The oil and gas CTG recommends a Subpart VVa level LDAR program for equipment at natural gas processing plants. Section XII.G.3. updates compliance dates for owners and operators of existing natural gas processing plants subject to Section XII.G. requirements. We propose to find that the revisions to Section XII.G. meet CAA and RACT requirements, and that they strengthen the SIP.
iv Section XII.H.
Section XII.H. sets forth emission reduction requirements for glycol natural gas dehydrators. Section XII.H.6.
establishes reporting requirements for sources subject to Section XII.H. The Commission revised references to ozone season in Section and XII.H.6.
to reflect that the requirements now apply year-round, including during the
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