This section identifies plan revisions that are conditionally approved based upon commitments received from the State.

(a) A plan revision for the Arizona Department of Environmental Quality (ADEQ) submitted April 28, 2017, by the Governor's designee, updating ADEQ's Clean Air Act (CAA) new source review (NSR) program only with respect to the CAA requirements related to ammonia as a precursor to PM2.5 under the nonattainment NSR program requirements in CAA section 189(e). This plan revision is conditionally approved as follows:

(1) The conditional approval is based upon the December 6, 2017 commitment from the State to submit a SIP revision to the EPA by March 31, 2019 consisting of rule revisions and/or demonstrations that will correct the deficiencies identified with this submittal, as specified in ADEQ's December 6, 2017 commitment letter. If the State fails to meet its commitment by March 31, 2019, the conditional approval will be treated as a disapproval only with respect to the CAA requirements related to ammonia as a precursor to PM2.5 under the nonattainment NSR program requirements in CAA section 189(e).

(2) [Reserved]

(b) A plan revision for the Maricopa County Air Quality Department (MCAQD) submitted May 18, 2016, by the Arizona Department of Environmental Quality (ADEQ), the Governor's designee, updating the MCAQD's Clean Air Act (CAA) new source review (NSR) program with respect to deficiencies identified by the EPA in Regulation I, Rule 100 and Regulation II, Rule 200. This plan revision is conditionally approved as follows:

(1) The conditional approval is based on the April 6, 2018 and October 5, 2018 commitments from the ADEQ, and on the April 2, 2018 letter from the MCAQD to the ADEQ requesting submittal of a letter of commitment for conditional approval, to submit a SIP revision consisting of rule revisions and/or demonstrations to the ADEQ within eleven (11) months after the EPA's approval, to allow the ADEQ to make the final submission to the EPA not later than twelve (12) months after the EPA's approval that will correct the deficiencies identified in this final notice. If the State fails to meet its commitment by that date that is twelve (12) months after the EPA's approval, the conditional approval will be treated as a disapproval to deficiencies identified by the EPA in Regulation I, Rule 100; and Regulation II, Rule 200.

(2) [Reserved]

(c) A plan revision for the Maricopa County Air Quality Department (MCAQD) submitted June 22, 2017, by the Arizona Department of Environmental Quality (ADEQ), the Governor's designee, providing MCAQD's Reasonably Available Control Technology (RACT) demonstration for the 2008 8-hour ozone National Ambient Air Quality Standards, and rule submissions in satisfaction thereof.

(1) The conditional approval is based upon the February 25, 2019 commitment from the State to submit a SIP revision consisting of rule revisions that will cure the identified deficiencies. MCAQD commits to submit these rules to the ADEQ within eleven (11) months after the EPA's conditional approval, and ADEQ commits to make the final submission to the EPA not later than twelve (12) months after the EPA's approval. If the State fails to meet its commitment, the conditional approval will be treated as a disapproval with respect to the rules and CTG categories for which the corrections are not made. The following MCAQD rules and additional materials are conditionally approved:

(i) Rule 350, Storage and Transfer of Organic Liquids (Non-Gasoline) at an Organic Liquid Distribution Facility;

(ii) Rule 351, Storage and Loading of Gasoline at Bulk Gasoline Plants and Bulk Gasoline Terminals;

(iii) Rule 352, Gasoline Cargo Tank Testing and Use;

(iv) Rule 353, Storage and Loading of Gasoline at Gasoline Dispensing Facilities; and

(v) The RACT demonstration titled “Analysis of Reasonably Available Control Technology for the 2008 8-Hour Ozone National Ambient Air Quality Standard (NAAQS) State Implementation Plan (RACT SIP),” Only those portions of the document beginning with “Gasoline Bulk Plants, Fixed Roof Petroleum Tanks, External Floating Roof Petroleum Tanks, And Gasoline Loading Terminals” on page 33 through the first full paragraph on page 35, and Appendix C: CTG RACT Spreadsheet, the rows beginning with “Gasoline Bulk Plants” on page 60, through “Service Stations—Stage I” on pages 67-69. This demonstration represents the RACT requirement for the following source categories: Control of Volatile Organic Emissions from Storage of Petroleum Liquids in Fixed-Roof Tanks (EPA-450/2-77-036), Control of Volatile Organic Emissions from Petroleum Liquid Storage in External Floating Roof Tanks (EPA-450/2-78-047); Control of Hydrocarbons from Tank Truck Gasoline Loading Terminals (EPA-450/2-77-026); Control of Volatile Organic Emissions from Bulk Gasoline Plants (EPA-450/2-77-035); Control of Volatile Organic Compound Leaks from Gasoline Tank Trucks and Vapor Collection Systems (EPA-450/2-78-051); and Design Criteria for Stage I Vapor Control Systems—Gasoline Service Stations (EPA-450/R-75-102).

(2) [Reserved]

[83 FR 19635, May 4, 2018, as amended at 84 FR 13548, Apr. 5, 2019; 85 FR 10988, Feb. 26, 2020]