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Federal Register / Vol. 86, No. 117 / Tuesday, June 22, 2021 / Proposed Rules
control measures, definitions, recordkeeping, and test methods in the CTG and the CAA, and that they satisfy CAA RACT requirements for the categories in question.37

CTGs.38 Colorados Reg. 7 contains SIPapproved 39 and submitted revisions see Section VI of this document; we propose to find that these revisions meet RACT requirements for the source category listed in Table 2.

1. RACT for CTG Sources Table 2 contains the CTG source category, the EPA reference document, and the corresponding sections of Reg.
7 that fulfill the applicable RACT
requirements for the EPA-issued
TABLE 2SOURCE CATEGORY, THE EPAS CTG REFERENCE DOCUMENT, AND CORRESPONDING SECTIONS OF REG. 7
FULFILLING RACT
Source category in DMNFR area
CTG reference document
Date of CTG

Reg. 7 sections fulfilling RACT

Oil and Gas

Control Techniques Guidelines for the Oil and Natural Gas Industry.

2016

Sections XII, XVIII, and revised Section D proposed for approval in this action.

We have reviewed the emission limitations and control requirements for the above source category and compared them against the EPAs CTG document and available technical information in CTG dockets. The EPA has also evaluated the submitted rules and has determined that they are consistent with the CAA, the EPAs regulations, and the EPAs policies. For more information, see the EPA TSD prepared in conjunction with this action. Based on the information in the record, we propose to find that the corresponding sections in Reg. 7 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 oil and gas source category are RACT for all affected sources in the DMNFR Area under the 2008 8-hour ozone NAAQS.

2. RACT for Non-CTG Major Sources In Colorados Technical Support Document for Reasonably Available Control Technology for Major Sources,40
Colorado identified a list of major nonCTG VOC and NOX sources in the DMNFR Area subject to RACT
requirements under a Serious classification. For major VOC and NOX
sources subject to nonattainment area RACT review, Colorado used the construction permit thresholds established in the States Reg. 3 for determining which emission points to review. Accordingly, emission points exceeding two tpy of VOC at a major VOC source and five tpy of NOX at a major NOX source, as reported on a sources Air Pollutant Emission Notice, and that were not part of the Moderate RACT review, were evaluated. We have reviewed the States May 13, 2020
submittal and find its approach to including these sources in the inventory acceptable. To satisfy the Serious RACT

SIP requirement to establish RACT for all existing major sources of VOC and/
or NOX in the DMNFR Area, the Commission incorporated by reference several NSPS and NESHAP regulations.
The Division also expanded the stationary combustion equipment standards and developed new general solvent use requirements, based on a detailed review of available information on major NOX and VOC sources in the DMNFR Area, an examination of the EPA RACT/Best Available Control Technology/Lowest Achievable Emission Rate Clearinghouse for similar emission points, and consideration of CAA section 182b RACT requirements for other ozone nonattainment areas.
Table 3 contains a list of non-CTG
source categories, the EPAs reference documents, and the corresponding sections of Reg. 7 that are proposed for approval in this action to fulfill RACT
requirements see Section VI of this document.41

TABLE 3SOURCE CATEGORIES, THE EPAS REFERENCE DOCUMENTS, AND CORRESPONDING SECTIONS OF REG. 7
PROPOSED FOR APPROVAL TO FULFILL RACT
The EPAs reference document or regulation if applicable
Reg. 7 sections fulfilling RACT

General solvent use at major sources

Stationary internal combustion engines
NOX Emissions from Stationary Internal Combustion Engines EPA453/R93032.
40 CFR 60, Subpart A, Section 60.18 General Provisions, General control device and work practice requirements.

Part C, Section II.F proposed for approval in this action.
Applicable provisions in Part E, Section II.

Source category in the DMNFR area 42

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We have reviewed the emission limitations and control requirements for the source categories in Table 3 and compared them to the EPAs regulations, ACT documents, available 37 See https www.epa.gov/ground-level-ozonepollution/ract-information.
38 See the EPAs TSD for a full analysis of Colorados rules as they relate to the EPAs guidelines and available technical information.

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Part E, Section III.B.2.

technical information, and guidelines.
The EPA has also evaluated the submitted rules 43 and has determined that they are consistent with the CAA, the EPAs regulations, and the EPAs 39 See
76 FR at 47443 and 83 FR at 3106931070.
2134 of the May 13, 2020 submittal.
41 See the EPAs TSD for a full analysis of Colorados rules as they relate to the EPAs guidelines and available technical information.
40 P.

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policies. For more information, see the EPA TSD prepared in conjunction with this action. Based on the information in the record, we propose to find that the corresponding sections in Reg. 7
42 Colorados major source RACT analysis can be found on pp. 11191120 and 11421149 of the May 31, 2017 submittal and the Technical Support Document for Reasonably Available Control Technology for Major Sources, November 17, 2016
pp. 29903273 of May 31, 2017 submittal.

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