Approval and Promulgation of Implementation Plans; North Carolina: Approval of Section 110(a)(1) Maintenance Plan for the Greensboro-Winston-Salem-High Point 1-Hour Ozone Maintenance Area to Maintain the 1997 8-Hour Ozone Standards

EPA is taking direct final action to approve a revision to the North Carolina State Implementation Plan (SIP), submitted to EPA on April 13, 2011, with supplemental information submitted on May 18, 2011, by the State of North Carolina, through the North Carolina Department of Environment and Natural Resources (NCDENR), through the Department of Air Quality. The revisions propose to modify North Carolina's SIP to address the required maintenance plan for the 1997 8- hour ozone national ambient air quality standards (NAAQS) for the Greensboro-Winston-Salem-High Point, North Carolina 1-hour ozone maintenance area, hereafter referred to as "the Triad Area." The Triad Area is comprised of Davidson, Forsyth, and Guilford and a portion of Davie County. This maintenance plan was submitted to ensure the continued attainment of the 1997 8-hour ozone NAAQS through the year 2018 in the Triad Area. EPA is approving these SIP revisions pursuant to section 110 of the Clean Air Act (CAA or Act). The submitted maintenance plan meets all of the statutory and regulatory requirements, and is consistent with EPA's guidance.