Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; North Carolina; Redesignation of the Raleigh-Durham-Chapel Hill 8-Hour Ozone Nonattainment Area to Attainment for Ozone

Résumé

On June 7, 2007, the State of North Carolina, through the North Carolina Department of Environment and Natural Resources (NCDENR), submitted a request to redesignate the Raleigh-Durham-Chapel Hill 8-hour ozone nonattainment area to attainment for the 8-hour ozone National Ambient Air Quality Standard (NAAQS); and to approve a State Implementation Plan (SIP) revision containing a maintenance plan for the Raleigh-Durham-Chapel Hill Area. The Raleigh-Durham-Chapel Hill 8- hour ozone nonattainment area (the "Triangle Area") is comprised of Durham, Franklin, Granville, Johnston, Orange, Person and Wake Counties in their entireties, and Baldwin, Center, New Hope and Williams Townships in Chatham County. In this action, EPA is proposing to approve the 8-hour ozone redesignation request for the Triangle Area. Additionally, EPA is proposing to approve the 8-hour ozone maintenance plan for the Triangle Area, including the motor vehicle emissions budgets (MVEBs) for nitrogen oxides (NO X ) and an insignificance determination for volatile organic compounds (VOC) emissions from motor vehicles. This proposed approval of North Carolina's redesignation request is based on EPA's determination that