Approval and Promulgation of Air Quality Implementation Plans; Virginia; Redesignation of the Shenandoah National Park Ozone Nonattainment Area To Attainment and Approval of the Area's Maintenance Plan

摘要

EPA is proposing to approve a redesignation request and a State Implementation Plan (SIP) revision submitted by the Commonwealth of Virginia. The Virginia Department of Environmental Quality (VADEQ) is requesting that the Shenandoah National Park area (the SNP area) be redesignated as attainment for the 8-hour ozone national ambient air quality standard (NAAQS). In conjunction with its redesignation request, the VADEQ submitted a SIP revision consisting of a maintenance plan for the SNP area that provides for continued attainment of the 8- hour ozone NAAQS for the next 10 years. EPA is proposing to make a determination that the SNP area has attained the 8-hour ozone NAAQS based upon three years of complete, quality-assured ambient air quality ozone monitoring data for 2002-2004. EPA's proposed approval of the 8- hour ozone redesignation request is based on its determination that the SNP area has met the criteria for redesignation to attainment specified in the Clean Air Act (CAA). EPA is providing information on the status of its adequacy determination for the motor vehicle emission budgets (MVEBs) that are identified in the maintenance plan for the SNP area for purposes of transpo