Partial Approval and Partial Disapproval of California Air Plan Revisions; South Coast Air Quality Management District

The Environmental Protection Agency (EPA) is proposing a partial approval and partial disapproval of a revision to the South Coast Air Quality Management District (SCAQMD or District) portion of the California State Implementation Plan (SIP). This revision concerns the District's demonstration regarding Reasonably Available Control Technology (RACT) requirements for the 2008 8-hour ozone National Ambient Air Quality Standard (NAAQS) in the South Coast Air Basin and Coachella Valley ozone nonattainment areas. We are proposing action on a local SIP revision under the Clean Air Act (CAA or the Act). We are taking comments on this proposal and plan to follow with a final action.