Approval and Promulgation of Air Quality Implementation Plans: Kentucky; Approval Section 110(a)(1) Maintenance Plans for the 1997 8-Hour Ozone Standard for the Huntington-Ashland Area, Lexington Area and Edmonson County

EPA is approving revisions to the Kentucky State Implementation Plan (SIP) concerning the maintenance plans addressing the 1997 8-hour ozone standard for the following areas: the Kentucky portion of the Huntington--Ashland Area (a portion of Greenup County); Lexington Area (Fayette and Scott Counties); and Edmonson County. These maintenance plans were submitted to EPA on May 27, 2008, by the Commonwealth of Kentucky and ensure the continued attainment of the 1997 8-hour ozone National Ambient Air Quality Standard (NAAQS) through the year 2020. These plans meet the statutory and regulatory requirements, and are consistent with EPA's guidance. EPA is approving the revisions pursuant to section 110 of the Clean Air Act ("CAA" or "Act"). On March 12, 2008, EPA issued a revised ozone standard. The current action, however, is being taken to address requirements under the 1997 ozone standard. Requirements for the Huntington-Ashland, Lexington, and Edmonson County Areas under the 2008 standard will be addressed in the future.