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Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Rules and Regulations
notice of enforcement in the Federal Register, the Coast Guard will provide the maritime community with advance notification of this enforcement period via Broadcast Notice to Mariners or Local Notice to Mariners. If the Captain of the Port Buffalo determines that the safety zone need not be enforced for the full duration stated in this notice she may use a Broadcast Notice to Mariners to grant general permission to enter the respective safety zone.
Dated: June 28, 2021.
Lexia M. Littlejohn, Captain, U.S. Coast Guard, Captain of the Port Buffalo.
FR Doc. 202114295 Filed 7221; 8:45 am BILLING CODE 911004P

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR08OAR20200646; FRL10025
28Region 8

Approval and Promulgation of Implementation Plans; Utah; 2017 Base Year Inventories for the 2015 8-Hour Ozone National Ambient Air Quality Standard for the Uinta Basin, Northern Wasatch Front and Southern Wasatch Front Nonattainment Areas Environmental Protection Agency EPA.
ACTION: Final rule.
AGENCY:

The Environmental Protection Agency EPA is approving a state implementation plan SIP revision submitted by the State of Utah. The revision fulfills the base year inventory requirement for the 2015 8-hour ozone national ambient air quality standard NAAQS for the Uinta Basin, Northern Wasatch Front, and Southern Wasatch Front nonattainment areas NAAs. Utah submitted the base year emissions inventories to meet, in part, the nonattainment requirements for Marginal ozone NAAs under the 2015 8hour ozone NAAQS. EPA is taking this action pursuant to sections 110, 172, and 182 of the Clean Air Act CAA.
DATES: This rule is effective on August 5, 2021.
ADDRESSES: The EPA has established a docket for this action under Docket ID
No. EPAR08OAR20200646. All documents in the docket are listed on the http www.regulations.gov 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.

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SUMMARY:

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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 http
www.regulations.gov, 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 8ARDIO, 1595 Wynkoop Street, Denver, Colorado, 802021129, telephone number: 303 3126709, email address: lang.matthew@epa.gov.
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 April 1, 2021
proposal.1 We proposed to approve the 2017 base year inventories for the 2015
8-hour ozone NAAQS for the Uinta Basin, Northern Wasatch Front, and Southern Wasatch Front Marginal NAAs because the State prepared the inventories in accordance with the requirements in sections 172c3 and 182a1 2 of the CAA and its implementing regulations, including those at 40 CFR 51.1315. EPA is finalizing its proposed approval of Utahs 2017 base year inventories for the 2015 8-hour ozone NAAQS for the Uinta Basin, Northern Wasatch Front, and Southern Wasatch Front Marginal NAAs. With this final rulemaking Utah will have met one of three requirements stemming from the Marginal nonattainment designation of the Uinta Basin, Northern Wasatch Front, and Southern Wasatch Front areas.
II. Response to Comments EPA held a 30-day comment period on the proposed rulemaking beginning on April 1, 2021 and closing on May 3, 2021. We received one supportive comment letter from the Utah Petroleum Association UPA, which focused on the Uinta Basin NAA. Our response to UPAs comment letter is below.
Comment summary: UPA states that it supports EPAs approval of the base year inventory, specifically supports the choice of 2017 as the base year, and supports use of an emissions inventory from a National Emissions Inventory 1 Approval and Promulgation of Implementation Plans; Utah; 2017 Base Year Inventories for the 2015 8-hour Ozone National Ambient Air Quality Standard for the Uinta Basin, Northern Wasatch Front and Southern Wasatch Front Nonattainment Areas, 86 FR 17106 April 1, 2021.
2 42 U.S.C. 7502c3, 7511aa1.

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year. UPA also commends the Utah Division of Air Quality for its decision to include a separate oil and gas source category in the base year, which UPA
says improves transparency of critical information needed to understand ozone formation in the Uinta Basin.
UPA also raises two areas of concern:
1 The lack of an opportunity to comment on the base year inventory for tribal lands within the Uinta Basin NAA; and 2 the need to be able to adjust the base year inventory based on evolving research and calculation methods. UPA explains that Utahs base year inventory includes only Statecontrolled lands, but tribal lands in the Uinta Basin include significant emissions sources, and UPA is not aware of any opportunity to comment on a base year inventory for the tribal lands. Further, UPA states that studies relevant to the emissions inventory are ongoing and recommends that EPA
allow updates to the base year inventory to account for this evolving research. In particular, UPA states that such an update is important for determining the adequacy of future Reasonable Further Progress RFP emission reductions as well as for photochemical modeling.
Response: We thank UPA for the supportive comment letter and we agree with UPA that Utahs SIP revision included the appropriate base year and was otherwise based on the most current and accurate information available to the State at the time the inventories were developed. With respect to UPAs concern regarding a lack of opportunity to comment on an inventory for sources on tribal land, we note that an inventory of emissions from Indian country sources is outside of the scope of this rulemaking. As explained in EPAs proposed rule, and repeated above, EPA is approving Utahs SIP
submission because the base year inventories therein accord with the requirements in sections 172c3 and 182a1 of the CAA and its implementing regulations, including those at 40 CFR 51.1315.
Similarly, we thank UPA for informing us of ongoing studies related to emissions in the Uinta Basin NAA.
The inventories submitted by the State of Utah were based on the most current and accurate information available to the State at the time that the inventories were developed. If, at any point in the future, Utah believes that a revision to the base year inventory is necessary, EPA is open to discussing that issue with the State.3 At this time, however, 3 EPA generally acknowledges that in certain circumstances, updating an already-approved base year inventory may be appropriate. Emissions
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