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Federal Register / Vol. 86, No. 114 / Wednesday, June 16, 2021 / Rules and Regulations
than English or if you are a person with disabilities who needs a reasonable accommodation at no cost to you, please contact the person identified in the FOR
FURTHER INFORMATION CONTACT section.
FOR FURTHER INFORMATION CONTACT: Lisa Beckham, EPA Region IX, 75 Hawthorne St., San Francisco, CA 94105. By phone:
415 9723811 or by email at beckham.lisa@epa.gov.
SUPPLEMENTARY INFORMATION:
Throughout this document, we, us, and our refer to the EPA.
Table of Contents I. Proposed Action II. Public Comments and EPA Responses III. EPA Action IV. Incorporation by Reference V. Statutory and Executive Order Reviews
I. Proposed Action
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Definitions For this document, we are giving meaning to certain words or initials as follows:
i The words or initials Act or CAA
mean or refer to the Clean Air Act, unless the context indicates otherwise.
ii The initials ADEQ mean or refer to the Arizona Department of Environmental Quality.
iii The initials Ag BMP mean or refer to the State of Arizonas Agricultural Best Management Practices program.
iv The initials ARS mean or refer to the Arizona Revised Statutes.
v The initials CBI mean or refer to confidential business information.
vi The initials CFR mean or refer to the Code of Federal Regulations.
vii The initials CO mean or refer to carbon monoxide.
viii The words EPA, we, us or our mean or refer to the United States Environmental Protection Agency.
ix The initials FIP mean or refer to Federal Implementation Plan.
x The initials MMBtu/hr mean or refer to million British thermal units per hour.
xi The initials NAAQS mean or refer to the National Ambient Air Quality Standards.
xii The initials NESHAP mean or refer to the National Emission Standards for Hazardous Air Pollutants.
xiii The initials NNSR mean or refer to Nonattainment New Source Review.
xiv The initials NOX mean or refer to oxides of nitrogen.
xv The initials NSPS mean or refer to New Source Performance Standards.
xvi The initials NSR mean or refer to New Source Review.
xvii The initials PM2.5 mean or refer to particulate matter with an aerodynamic diameter of less than or equal to 2.5 micrometers, or fine particulate matter.

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xviii The initials PM10 mean or refer to particulate matter with an aerodynamic diameter of less than or equal to 10 micrometers.
xix The initials PSD mean or refer to Prevention of Significant Deterioration.
xx The initials SER mean or refer to significant emission rate.
xxi The initials SIP mean or refer to State Implementation Plan.
xxii The initials SO2 mean or refer to sulfur dioxide.
xxiii The words State or Arizona mean the State of Arizona, unless the context indicates otherwise.
xxiv The initials TSD mean or refer to the technical support document for this action unless the context indicates otherwise.

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On December 23, 2020 85 FR 83868, the EPA proposed to approve revisions to the ADEQ portion of the Arizona SIP
consisting of several rule revisions and demonstrations submitted by the ADEQ
related to the ADEQs CAA NSR
permitting program.
First, we proposed to approve a July 22, 2020 SIP submittal from the ADEQ
that contains rule revisions and other demonstrations primarily intended to correct deficiencies in the ADEQs minor NSR program referred to hereinafter as the 2020 Minor NSR
submittal. The deficiencies being corrected by the 2020 Minor NSR
submittal were identified in a November 2, 2015 1 final limited approval and limited disapproval action by the EPA
referred to hereinafter as the EPAs 2015 NSR action.2 Our 2015 NSR
action was the result of an extensive review of the ADEQs NSR program, in response to a comprehensive NSR
program update submitted by the ADEQ
to the EPA in a 2012 SIP revision referred to hereinafter as the 2012
NSR SIP submittal. The 2012 NSR SIP
submittal represented the ADEQs first comprehensive update to its SIPapproved NSR program since the 1980s.
Our review of the 2012 NSR SIP
submittal for compliance with CAA
requirements therefore included all aspects of the ADEQs minor NSR, Prevention of Significant Deterioration PSD, and nonattainment NSR NNSR
permitting programs, including NSRrelated visibility requirements for major stationary sources. In a May 4, 2018
1 80

FR 67319 Nov. 2, 2015.
the 2015 NSR action, we also finalized other actions, including a partial disapproval related to the fine particulate matter PM2.5 significant monitoring concentration, and limited approvals, without corresponding limited disapprovals, related to section 189e of the Act.
2 In
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final rule,3 we approved revisions to the ADEQs NSR program, submitted to the EPA in 2017, that corrected a large portion of the deficiencies identified in our 2015 NSR action, primarily related to the PSD and NNSR programs referred to hereinafter as the 2018
Major NSR action. Thus, the 2020
Minor NSR submittal that is the subject of our present action addresses the remaining deficiencies from our 2015
NSR action.
Second, our December 23, 2020
proposed action also included our proposed approval of a March 29, 2019
SIP submittal, and a January 14, 2020
supplemental submittal, from the ADEQ. These two submittals are intended to resolve an ADEQ NNSR
program deficiency related to the permitting of ammonia as a precursor to PM2.5 in the West Central Pinal and Nogales PM2.5 nonattainment areas the March 29, 2019 submittal and January 14, 2020 supplement are collectively referred to hereinafter as the Ammonia PM2.5 NSR submittal. In a June 22, 2016 4 final limited disapproval rule action, we had identified additional deficiencies in the ADEQs NNSR
program related to PM2.5 precursors referred to hereinafter as the EPAs 2016 PM2.5 precursor action. In our 2018 Major NSR action, in addition to approving rule revisions to the ADEQs NSR program, the EPA conditionally approved 5 the ADEQs NNSR program pursuant to CAA section 110k4
solely with respect to ammonia as a precursor to PM2.5 under section 189e of the Act.6 We found in our 2018 Major NSR action that the ADEQs SIP
revisions otherwise resolved the deficiencies identified in our 2016 PM2.5
precursor action.7 In addition to resolving the deficiency that was the basis for our conditional approval for ammonia as a precursor to PM2.5 under CAA section 189e, the Ammonia PM2.5
NSR submittal also includes other 3 83

FR 19631 May 4, 2018.
FR 40525 June 22, 2016.
5 83 FR 19631, 19634. The conditional approval was based upon a December 6, 2017 letter from the State committing to submit a SIP revision to the EPA consisting of rule revisions and/or demonstrations that would correct the deficiencies related to ammonia as a precursor to PM2.5 under the NNSR program requirements in CAA section 189e. See 83 FR 19631, 1963319634.
6 Concurrent with our proposed conditional approval action in 2018, we made an interim final determination that the State of Arizona had satisfied the requirements of part D of the CAA
permitting program for areas under the jurisdiction of ADEQ with respect to PM2.5 precursors under section 189e. See 83 FR 1195 January 10, 2018
and 83 FR 1212 January 10, 2018. The effect of our interim final determination was that the imposition of sanctions that had been triggered were deferred.
7 See 83 FR 19631, 1963319634.
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