Approval and Promulgation of Implementation Plans; Texas; Reasonably Available Control Technology for the 2008 8-Hour Ozone National Ambient Air Quality Standard

The Environmental Protection Agency (EPA) is conditionally approving revisions to the Texas State Implementation Plan (SIP) addressing Oxides of Nitrogen (NOX) Reasonably Available Control Technology (RACT) for the Martin Marietta (formerly, Texas Industries, Inc., or TXI) cement manufacturing plant in Ellis County. We are fully approving revisions to the Texas SIP addressing NOX RACT for all other affected sources in the ten county Dallas Fort Worth (DFW) 2008 8-Hour ozone nonattainment area. We are also approving NOX RACT negative declarations (a finding that there are no major sources of NOX emissions in certain categories) for the DFW 2008 8-Hour ozone nonattainment area. The DFW 2008 8-Hour ozone nonattainment area consists of Collin, Dallas, Denton, Ellis, Johnson, Kaufman, Parker, Rockwall, Tarrant, and Wise counties. The RACT requirements apply to major sources of NOX in these ten counties.