Approval and Promulgation of Air Quality Implementation Plans; Virginia; 15% Rate of Progress Plan for the Northern Virginia Portion of the Metropolitan Washington D.C. Area

EPA is granting conditional interim approval of the State Implementation Plan (SIP) revision submitted by the Commonwealth of Virginia, for the Northern Virginia portion of the Metropolitan Washington D.C. serious ozone nonattainment area, to meet the 15 percent reasonable further progress (RFP, or 15% plan) requirements of the Clean Air Act (the Act). EPA is granting conditional interim approval of the 15% plan, submitted by the Commonwealth of Virginia, because on its face the plan achieves the required 15% emission reduction, but additional documentation to verify the emission calculations is necessary for full approval. Additionally, the plan relies upon the Virginia Inspection and Maintenance (I/M) rule that received final conditional interim approval on May 15, 1997 (62 FR 26745). This action is being taken under section 110 of the Clean Air Act.