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Federal Register / Vol. 86, No. 25 / Tuesday, February 9, 2021 / Rules and Regulations
8697

MASSACHUSETTS NON REGULATORY
Name of non regulatory SIP
provision
Applicable geographic or nonattainment area

Infrastructure SIP submittal for 2015 Ozone NAAQS.

Statewide

3 To

September 27, 2018

EPA approved date 3

Explanations

February 9, 2021, Insert Federal Register citation.

Approved with respect to requirements for CAA
section 110a2A, B, C, D, E, F, G, H, J, K, L, and M with the exception of the PSD-related requirements of C, D, and J.

determine the EPA effective date for a specific provision listed in this table, consult the Federal Register notice cited in this column for the particular provision.

FR Doc. 202102536 Filed 2821; 8:45 am BILLING CODE 656050P

ENVIRONMENTAL PROTECTION
AGENCY
40 CFR Part 52
EPAR03OAR20200332; FRL10017
26Region 3

Air Plan Approval; Pennsylvania; 1997
8-Hour Ozone National Ambient Air Quality Standard NAAQS Second Maintenance Plan for the Altoona Blair County Area Environmental Protection Agency EPA.
ACTION: Final rule.
AGENCY:

The Environmental Protection Agency EPA is approving a state implementation plan SIP revision submitted by the Commonwealth of Pennsylvania. This revision pertains to the Commonwealths plan, submitted by the Pennsylvania Department of Environmental Protection PADEP, for maintaining the 1997 8-hour ozone national ambient air quality standard NAAQS referred to as the 1997
ozone NAAQS in the Altoona, Blair County, Pennsylvania area Altoona Area. EPA is approving these revisions to the Pennsylvania SIP in accordance with the requirements of the Clean Air Act CAA.
DATES: This final rule is effective on March 11, 2021.
ADDRESSES: EPA has established a docket for this action under Docket ID
Number EPAR03OAR20200332. All documents in the docket are listed on the https 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.
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 https
SUMMARY:

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State submittal date/
effective date
VerDate Sep<11>2014

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www.regulations.gov, or please contact the person identified in the FOR FURTHER
INFORMATION CONTACT section for additional availability information.
FOR FURTHER INFORMATION CONTACT:
David Talley, Planning &
Implementation Branch 3AD30, Air &
Radiation Division, U.S. Environmental Protection Agency, Region III, 1650
Arch Street, Philadelphia, Pennsylvania 19103. The telephone number is 215
8142117. Mr. Talley can also be reached via electronic mail at talley.david@epa.gov.
SUPPLEMENTARY INFORMATION:
I. Background On September 3, 2020 85 FR 54947, EPA published a notice of proposed rulemaking NPRM for the Commonwealth of Pennsylvania. In the NPRM, EPA proposed approval of Pennsylvanias plan for maintaining the 1997 ozone NAAQS in the Altoona Area through August 1, 2027, in accordance with CAA section 175A. The formal SIP
revision was submitted by PADEP on February 27, 2020.
II. Summary of SIP Revision and EPA
Analysis On August 1, 2007 72 FR 41906
effective August 1, 2007, EPA approved a redesignation request and maintenance plan from PADEP for the Altoona Area. In accordance with section 175Ab, at the end of the eighth year after the effective date of the redesignation, the state must also submit a second maintenance plan to ensure ongoing maintenance of the standard for an additional 10 years, and in South Coast Air Quality Management District v. EPA,1 the D.C. Circuit held that this requirement cannot be waived for areas, like Charleston, that had been redesignated to attainment for the 1997
8-hour ozone NAAQS prior to revocation and that were designated attainment for the 2008 ozone NAAQS.
CAA section 175A sets forth the criteria for adequate maintenance plans. In addition, EPA has published longstanding guidance that provides 1 882

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F.3d 1138 D.C. Cir. 2018.

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further insight on the content of an approvable maintenance plan, explaining that a maintenance plan should address five elements: 1 An attainment emissions inventory; 2 a maintenance demonstration; 3 a commitment for continued air quality monitoring; 4 a process for verification of continued attainment; and 5 a contingency plan.2 PADEPs February 27, 2020 submittal fulfills Pennsylvanias obligation to submit a second maintenance plan and addresses each of the five necessary elements.
As discussed in the September 3, 2020 NPRM, EPA allows the submittal of a less rigorous, limited maintenance plan LMP to meet the CAA section 175A requirements by demonstrating that the areas design value 3 is well below the NAAQS and that the historical stability of the areas air quality levels shows that the area is unlikely to violate the NAAQS in the future. EPA evaluated PADEPs February 27, 2020 submittal for consistency with all applicable EPA
guidance and CAA requirements. EPA
found that the submittal met CAA
section 175A and all CAA requirements, and proposed approval of the LMP for the Altoona Area as a revision to the Pennsylvania SIP. The effect of this action makes certain commitments related to the maintenance of the 1997
ozone NAAQS Federally enforceable as part of the Pennsylvania SIP.
Subsequent to the publication of the September 3, 2020 NPRM, EPA
discovered a minor computational error in the data presented in Table 1:
Typical Summer Day NOX and VOC
Emissions for the Altoona Area. While the data are correct, the total volatile organic compounds VOC emissions were summed incorrectly in Table 1.
2 Procedures for Processing Requests to Redesignate Areas to Attainment, Memorandum from John Calcagni, Director, Air Quality Management Division, September 4, 1992 Calcagni Memo.
3 The ozone design value for a monitoring site is the 3-year average of the annual fourth-highest daily maximum 8-hour average ozone concentrations.
The design value for an ozone nonattainment area is the highest design value of any monitoring site in the area.

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