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 of the 8-hour ozone standard and incorporate the San Antonio Early Action Compact (EAC) Clean Air Plan into the Texas SIP. EPA is approving the photochemical modeling in support of the attainment demonstration of the 8-hour ozone standard within the San Antonio EAC area and is approving the associated control measures. 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 achieve attainment of and maintain the 8-hour National Ambient Air Quality Standard (NAAQS) for ozone.