Air Plan Revisions; Arizona; Maricopa County Air Quality Department

The Environmental Protection Agency (EPA) is taking final action to approve revisions to the Maricopa County Air Quality Department (MCAQD or "County") portion of the Arizona State Implementation Plan (SIP). These revisions concern emissions of volatile organic compounds (VOC) from storage, transfer, or loading of organic liquids and gasoline. We are approving local rules that regulate these emission sources under the Clean Air Act (CAA or the Act). We are also approving the MCAQD's reasonably available control technology (RACT) demonstration associated with these rules for the 2008 8-hour ozone national ambient air quality standards (NAAQS) in the Phoenix-Mesa ozone nonattainment area.