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Federal Register / Vol. 86, No. 87 / Friday, May 7, 2021 / Proposed Rules major sources located in Allegheny County. These RACT evaluations were submitted to meet RACT requirements for the 2008 8-hour ozone national ambient air quality standards NAAQS.
This action is being taken under the Clean Air Act CAA.
DATES: Written comments must be received on or before June 7, 2021.
ADDRESSES: Submit your comments, identified by Docket ID No. EPAR03
OAR20200575 at https
www.regulations.gov, or via email to opila.marycate@epa.gov. For comments submitted at Regulations.gov, follow the online instructions for submitting comments. Once submitted, comments cannot be edited or removed from Regulations.gov. For either manner of submission, EPA may publish any comment received to its public docket.
Do not submit electronically any information you consider to be confidential business information CBI
or other information whose disclosure is restricted by statute. Multimedia submissions audio, video, etc. must be accompanied by a written comment.
The written comment is considered the official comment and should include discussion of all points you wish to
make. EPA will generally not consider comments or comment contents located outside of the primary submission i.e., on the web, cloud, or other file sharing system. For additional submission methods, please contact the person identified in the FOR FURTHER
INFORMATION CONTACT section. For the full EPA public comment policy, information about CBI or multimedia submissions, and general guidance on making effective comments, please visit https www2.epa.gov/dockets/
commenting-epa-dockets.
Ms.
Cynthia Stahl, Air Quality Analysis Branch 3AD30, Air and Radiation Division, U.S. Environmental Protection Agency, Region III, 1650 Arch Street, Philadelphia, Pennsylvania 19103. The telephone number is 215 8142180.
Ms. Stahl can also be reached via electronic mail at stahl.cynthia@
epa.gov.

FOR FURTHER INFORMATION CONTACT:

On May 7, 2020, PADEP submitted revisions to its SIP to address case-by-case NOX and/or VOC RACT for 93 major facilities. On February 9, 2021, PADEP supplemented its May 7, 2020 submittal with
SUPPLEMENTARY INFORMATION:

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additional materials for nine facilities in Allegheny County. These SIP revisions are intended to address the NOX and/or VOC RACT requirements under sections 182 and 184 of the CAA for the 1997
and/or 2008 8-hour ozone NAAQS.
Table 1 of this document lists the facilities included in PADEPs submittals that EPA is proposing to approve in this action. EPA views each facility as a separable SIP revision and may take separate final action on one or more facilities. In this rulemaking action, EPA is only proposing to approve case-by-case RACT
determinations for ten of the 93
facilities submitted to EPA by PADEP.
These ten facilities are located in Allegheny County and were submitted on behalf of the Allegheny County Health Department ACHD.
For additional background information on Pennsylvanias presumptive RACT II SIP see 84 FR
20274 May 9, 2019 and on Pennsylvanias source-specific or caseby-case RACT determinations see the appropriate technical support document TSD which is available online at https www.regulations.gov, Docket No.
EPAR03OAR20200575.

TABLE 1PADEP SIP SUBMITTALS FOR MAJOR NOX AND/OR VOC SOURCES IN ALLEGHENY COUNTY, PENNSYLVANIA
SUBJECT TO SOURCE-SPECIFIC RACT UNDER THE 2008 8-HOUR OZONE STANDARD
Major source Bellefield boiler Eastman Chemical Resins, Inc.
Energy Center Northshore formerly, Pittsburgh Thermal Limited Partnership Neville Chemical Pittsburgh Allegheny County Thermal Ltd.Stanwix Street PACT
PPG Industries Inc.Springdale Universal Stainless & Alloy Products, Inc.
U.S. Steel Mon Valley WorksClairton formerly, USX Corporation Clairton Works U.S. Steel Mon Valley WorksEdgar Thomson formerly, USX Corporation Edgar Thomson Works U.S. Steel Mon Valley WorksIrvin formerly, USX Corporation Irvin Works
I. Background A. 1997 and 2008 8-Hour Ozone NAAQS
Ground level ozone is not emitted directly into the air but is created by chemical reaction between NOX and VOC in the presence of sunlight.
Emissions from industrial facilities, electric utilities, motor vehicle exhaust, gasoline vapors, and chemical solvents are some of the major sources of NOX
and VOC. Breathing ozone can trigger a variety of health problems, particularly for children, the elderly, and people of all ages who have lung diseases such as asthma. Ground level ozone can also have harmful effects on sensitive vegetation and ecosystems.

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On July 18, 1997, EPA promulgated a standard for ground level ozone based on 8-hour average concentrations. 62 FR
38856. The 8-hour averaging period replaced the previous 1-hour averaging period, and the level of the NAAQS was changed from 0.12 parts per million ppm to 0.08 ppm. EPA has designated two moderate nonattainment areas in Pennsylvania under the 1997 8-hour ozone NAAQS, namely PhiladelphiaWilmington-Atlantic City, PA-NJ-MDDE the Philadelphia Area and Pittsburgh-Beaver Valley the Pittsburgh Area. See 40 CFR 81.339.
On March 12, 2008, EPA strengthened the 8-hour ozone standards, by revising its level to 0.075 ppm averaged over an 8-hour period 2008 8-hour ozone NAAQS. On May 21, 2012, EPA

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designated five marginal nonattainment areas in Pennsylvania for the 2008 8hour ozone NAAQS: AllentownBethlehem-Easton, Lancaster, Reading, the Philadelphia Area, and the Pittsburgh Area. 77 FR 30088; see also 40 CFR 81.339.
On March 6, 2015, EPA announced its revocation of the 1997 8-hour ozone NAAQS for all purposes and for all areas in the country, effective on April 6, 2015. 80 FR 12264. EPA has determined that certain nonattainment planning requirements continue to be in effect under the revoked standard for nonattainment areas under the 1997 8hour ozone NAAQS, including RACT.
On June 10, 2013, EPA determined that the Allegheny County 1997 8-hour ozone NAAQS RACT demonstration
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