Vote — approved

Jack Sellers	yes
Thomas Galvin	yes
Bill Gates	yes
Clint Hickman	yes
Steve Gallardo	yes

40.WITHDRAWAL OF THE ARIZONA STATE IMPLEMENTATION PLAN (SIP) SUBMITTAL REGARDING RULE 600 (EMERGENCY EPISODES) ORIGINALLY SUBMITTED ON DECEMBER 17, 2021 The Maricopa County Air Quality Department (MCAQD) requests approval to withdraw the December 17, 2021 SIP submittal requesting the rescission of Maricopa County Air Pollution Control Regulations, Rule 600 from the Arizona State Implementation Plan (SIP) and approval of a revised version of Rule 600 into the Arizona SIP. Rule 600 was originally 

Item Text

40. WITHDRAWAL OF THE ARIZONA STATE IMPLEMENTATION PLAN (SIP) SUBMITTAL REGARDING RULE 600 (EMERGENCY EPISODES) ORIGINALLY SUBMITTED ON DECEMBER 17, 2021 The Maricopa County Air Quality Department (MCAQD) requests approval to withdraw the December 17, 2021 SIP submittal requesting the rescission of Maricopa County Air Pollution Control Regulations, Rule 600 from the Arizona State Implementation Plan (SIP) and approval of a revised version of Rule 600 into the Arizona SIP. Rule 600 was originally adopted in 1988 and was approved for incorporation into the Arizona SIP in 1999 by the U.S. Environmental Protection Agency (EPA). On December 8, 2021, the Maricopa County Board of Supervisors adopted revisions to Rule 600 and approved submittal of the revised rule as a replacement for the existing SIP Rule 600 as a revision to the Arizona SIP. On December 17, 2021, MCAQD through ADEQ submitted a SIP revision to the EPA requesting the EPA to rescind the existing version of SIP Rule 600 and replace it with the revised version of Rule 600. On February 10, 2022, ADEQ submitted the same revised version of Rule 600 as part of the Infrastructure SIP revision (“2022 I-SIP supplement”) to satisfy the requirements of the Clean Air Act for 2012 PM2.5 for emergency episodes. In essence, the revised version of Rule 600 was submitted to the EPA twice for incorporation into the Arizona SIP. On June 13, 2024, the EPA acted on ADEQ’s 2022 I-SIP supplement and proposed to approve the revised version of Rule 600 into the Arizona SIP (89 FR 50245). The EPA advised MCAQD to withdraw the December 17, 2021 SIP submittal because the SIP actions requested by MCAQD and ADEQ for Rule 600 are duplicative and action on ADEQ’s I-SIP submittal is sufficient to incorporate the revised version of Rule 600 into the Arizona SIP. (C-85-25-007-X-00)