Approval and Promulgation of Implementation Plans; North Carolina: Raleigh/Durham Area and Greensboro/Winston-Salem/High Point Area Maintenance Plan Updates

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The EPA is approving revisions to the State Implementation Plan (SIP) submitted by the North Carolina Department of Environment and Natural Resources (NCDENR) on June 4, 2004. This SIP revision satisfies the requirement of the Clean Air Act (CAA) as amended in 1990 for the second 10-year updates of both the Raleigh/Durham area (Durham and Wake Counties, and a portion of Granville County) and the Greensboro/Winston-Salem/High Point area (Davidson, Forsyth, and Guilford Counties, and a portion of Davie County) 1-hour ozone maintenance plans.