Approval and Promulgation of Implementation Plans; Illinois; Ozone

The EPA is approving State Implementation Plan (SIP) revisions submitted by the State of Illinois to meet certain requirements of the Clean Air Act (CAA) regarding attainment of the ozone standard in the Chicago-Gary-Lake County ozone nonattainment area. These SIP revisions are primarily required by section 182 of the CAA. This action fully approves the following: An ozone attainment demonstration demonstrating attainment by November 15, 2007; a post-1999 ozone Rate-Of-Progress (ROP) plan with associated ROP mobile source conformity emission budgets; a contingency measures plan for both the ozone attainment demonstration and the post-1999 ROP plan; a commitment to conduct a Mid-Course Review (MCR) of the ozone attainment demonstration; motor vehicle emission budgets for Volatile Organic Compounds (VOC) and Oxides of Nitrogen ( NO<INF>X</INF>) for the 2007 attainment year, until such time that revised budgets are submitted and found to be adequate for conformity purposes as called for by the State in its commitment to recalculate and apply revised emissions budgets for conformity within two years of the formal release of MOBILE6; and, a demonstration that the State has fully implemented Reasonably Available Control Measures (RACM). The EPA is also revising the existing NO<INF>X</INF> emissions control waiver for the Illinois portion of the Chicago-Gary-Lake County ozone nonattainment area to exclude from the waiver NO<INF>X</INF> emission controls for certain Electrical Generating Units (EGUs), major non-EGU boilers and turbines, and major cement kilns in the ozone nonattainment area relied on by the State to attain the ozone standard, as noted in the State's ozone attainment demonstration. The existing NO<INF>X</INF> emissions control waiver remains in place for Reasonably Available Control Technology (RACT), New Source Review (NSR), and certain requirements of vehicle Inspection and Maintenance (I/M) and transportation and general conformity. The EPA is denying a r