Approval and Revision of Air Plans; Arizona; Regional Haze State and Federal Implementation Plans; Reconsideration

The Environmental Protection Agency (EPA) is proposing to approve a source-specific revision to the Arizona State Implementation Plan (SIP) that addresses requirements for best available retrofit technology (BART) at Cholla Generating Station (Cholla). The EPA proposes to find that the SIP revision fulfills the requirements of the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR) for BART at Cholla. In conjunction with this proposed approval, we propose to withdraw those portions of the federal implementation plan (FIP) that address BART for Cholla. We previously partially granted petitions for reconsideration of that FIP from Cholla's owners, Arizona Public Service Company (APS) and PacifiCorp. We are now proposing to find that final withdrawal of the FIP, as it applies to Cholla, would constitute our action on APS's and PacifiCorp's petitions for reconsideration of the FIP.