The EPA is approving revisions to the State Implementation Plan (SIP) submitted by the Chairman of the Texas Commission on Environmental Quality (TCEQ) on December 6, 2004. The revisions demonstrate attainment and maintenance of the 8-hour ozone standard and incorporate the Austin Early Action Compact (EAC) Clean Air Action Plan (CAAP) into the Texas SIP. EPA is approving the photochemical modeling in support of the attainment demonstration for the 8-hour ozone standard within the Austin EAC area. EPA is approving the Austin EAC CAAP, which includes control measures and demonstrates maintenance of the standard through 2012. These actions strengthen the SIP in accordance with the requirements of sections 110 and 116 of the Federal Clean Air Act (the Act) and will result in emission reductions needed to help ensure attainment and maintenance of the 8-hour National Ambient Air Quality Standard (NAAQS) for ozone.