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Federal Register / Vol. 86, No. 117 / Tuesday, June 22, 2021 / Proposed Rules
lotter on DSK11XQN23PROD with PROPOSALS1

result in more tanks being controlled.65
Section I.D.3.a.i requires that storage tanks with uncontrolled actual emissions of VOC equal to or greater than four tons per year collect and control emissions from each storage tank by routing emissions to and operating air pollution control equipment that achieves a VOC control efficiency of 95%; combustion devices must have a design destruction efficiency of at least 98% for VOC
unless authorized by permit before March 1, 2020. Section I.D.3.c. requires that storage tanks below the four tpy threshold that increase emissions above the threshold must be in compliance within 60 days of the first date of the month in which the threshold was exceeded. The Commission has determined that the four tpy threshold and implementation timetable is costeffective, technically feasible, and will ensure no backsliding as provided for in the Clean Air Act, Section 110l.66
Colorado also submitted a provision for inclusion in the SIP that was previously state-only. Section I.D.2.a.
requires that that operators of newly constructed tanks employ controls during the first 90 days after the date of first production. The provision is proposed for inclusion in the SIP to avoid confusion as to whether compliance with the requirement can be considered a limitation upon a sources potential to emit for purposes of permitting.

v Section I.F.
Section I.F. contains provisions for storage tank recordkeeping and reporting. As a result of replacing the system-wide control strategy with the fixed control threshold in Section I.D., recordkeeping and reporting requirements for demonstrating compliance with Section I.D. were revised in Section I.F. Operators subject to the system-wide control strategy were given until August 31, 2020, to submit the report for the time period in 2020
during which the system-wide control strategy remained effective i.e. January 1April 30, 2020. Section I.F.2 contains the recordkeeping and reporting scheme for the tanks subject to the new four tpy control threshold provision. Under Sections I.F.2. and I.F.3., owners or operators of storage tanks subject to Section I.D.3. must maintain records and submit annual reports including information regarding inspections, calendar monthly VOC emissions, emission factors used, and the control efficiency of air pollution control equipment. Reports must be retained for a minimum of five years.
vi Section I.L.
Section I.L. contains provisions for the DMNFR Area leak detection and repair program. Sections I.L.2.a. and I.L.2.b. revised language clarifies that applicability for leak inspections at well production facilities are based on rolling twelve-month emission totals and not a calendar year basis.

iv Section I.E.

vii Section II

Section I.E. contains provisions for monitoring of storage tanks and air pollution control equipment. Section I.E. was revised to apply the monitoring requirements for all storage tanks controlled pursuant to Section I.D., which will ensure monitoring of condensate tanks, crude oil, and produced water tanks on a weekly basis per Section I.E.2.c. The required inspections have also been updated to include elements that can impact the performance of well production facility equipment and reduce emissions including checking that burner trays are not visibly clogged, that pressure relief valves are properly sealed, and that vent lines are closed. Inspection documentation requirements in former Section XII.E.3. were removed and moved to Section I.F.2.c.iii in order to condense all recordkeeping requirements in Section I.F.

Section II contains statewide controls for oil and gas operations. The majority of Section II consists of State Only requirements. However, the Commission submitted previous State Only revisions for inclusion in the SIP
to Section II.C.1.b.ii, which requires that operators of newly constructed tanks employ controls within 90 days of commencement of operation. Previous State Only requirements in Section II.G.
were also submitted for inclusion in Colorados SIP. The provisions require control of emissions coming off a separator after a well is newly constructed, hydraulically fractured, or recompleted. These emissions must be routed to a gas gathering line or controlled by air pollution control equipment. The provisions were submitted for inclusion in the SIP to clarify permitting compliance requirements in Reg. 3.
We propose to find that the revisions to Part D meet CAA and RACT
requirements, and that they strengthen
65 See 66 See
pp. 592593 of the May 13, 2020 submittal.
p. 591 of the May 13, 2020 submission.

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the SIP. We therefore propose to approve the changes in Part C.
e. Part E
The revisions add a new Part E
heading for Sections I, II, III, and IV
previously Reg 7, Sections XVI, XIX, and XX. Part E regulates emissions from combustion equipment at major sources of RACT. The revisions also include renumbering and updates to Parts and Sections referenced throughout Part E, add RACT
requirements in Colorados ozone SIP
for 50 tpy major sources of VOC and/or NOX, and other cleanup and strengthening measures.67
i Section II
Section II provisions control emissions from stationary and portable combustion equipment in the DMNFR
area. Section II.A.1.b. expands the applicability of Section II requirements to stationary combustion equipment at major sources of NOX as of January 27, 2020. New definitions were added in Section II.A.3. for ceramic kiln, dryer, and furnace to support the expanded combustion adjustment requirements in Section II.A.6. The definitions are clear, straightforward, and accurate.
Owners or operators of combustion equipment specified in Section II.A.1.b.
must comply with emission limits in Section II.A.4. by July 20, 2021. This date is consistent with the EPAs implementation deadline for RACT
measures not tied to attainment.68 New Sections II.A.4.a.iii expands emission limits requirements for boilers over 100
MMBtu/hr larger boilers and Section II.A.4.a.iv adds emission limits for boilers between 50 and 100 MMBtu/hr located at sources greater than or equal to 50 tpy of NOX. Applicability of combustion process adjustment requirements in Section II.A.6. was expanded to include individual pieces of combustion equipment at major sources of NOX under a Serious classification. The requirements of Section II.A.6.a.ii apply to boilers, duct burners, process heaters, stationary combustion turbines, stationary 67 The revisions to Sections II.A.1.b., II.A.4.a.iii and iv, II.A.6.a.ii, and II.A.6.b.viiiB include the placeholder language EFFECTIVE DATE OF
THE RECLASSIFICATION because the Commission approved the revisions before the EPA
finalized reclassification of the DMNFR Area to Serious. The EPA finalized its reclassification of the Area on December 26, 2019. See Final rule, Finding of Failure To Attain and Reclassification of Denver Area for the 2008 Ozone National Ambient Air Quality Standard, 84 FR 70897.
68 Final Rule, Finding of Failure To Attain and Reclassification of Denver Area for the 2008 Ozone National Ambient Air Quality Standard, 84 FR
70897, 70900 Dec. 26, 2019.

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