Approval and Promulgation of Air Quality Implementation Plans; Texas; Attainment Demonstration for the Dallas/Fort Worth 1997 8-Hour Ozone Nonattainment Area

The EPA is conditionally approving the Dallas/Fort Worth (DFW) 1997 8-hour ozone State Implementation Plan (SIP) revisions submitted on May 30, 2007 and November 7, 2008, as supplemented on April 23, 2008. This final conditional approval action is for the attainment demonstration SIP, which includes the 2009 attainment Motor Vehicle Emissions Budgets (MVEBs), the Reasonably Available Control Measures (RACM) demonstration, and the failure-to-attain contingency measures plan. The approval is conditioned upon Texas adopting and submitting to EPA prior to March 1, 2009, a complete SIP revision to limit the use of Discrete Emission Reduction Credits (DERCs), beginning in March 2009. If the State meets its commitment to submit the DERC SIP revision, EPA will undertake additional rulemaking action on the approvability of the DERC SIP revision and, if EPA approves that SIP revision, the conditional approval of the attainment demonstration will be converted to a full approval at that time. We are fully approving two local control measures relied upon in the attainment demonstration, the Voluntary Mobile Source Emission Reduction Plan (VMEP) and Transportation Control Measures (TCMs). We are also fully approving the DFW area SIP as meeting the Reasonably Available Control Technology (RACT) requirement for volatile organic compounds (VOCs) for both the 1-hour and 1997 8-hour ozone standards. These actions will result in emissions reductions in the DFW 8-hour ozone nonattainment area and meet section 110 and part D of the Act and EPA's regulations.