Approval and Promulgation of Air Quality Plans; Indiana; Ozone

The EPA is fully approving State Implementation Plan (SIP) revisions submitted by the Indiana Department of Environmental Management (IDEM) for attainment of the 1-hour ozone standard in the Chicago-Gary-Lake County ozone nonattainment area. These SIP revisions are required by Section 182 of the Clean Air Act. This action approves the following: An ozone attainment demonstration; a plan demonstrating how progress in emission reductions will be achieved by specified milestone years through the area's attainment date of 2007 (i.e. a post-1999 Rate of Progress Plan (ROP)); a contingency measures plan for both the ozone attainment demonstration and the post-1999 ROP plan; a reasonably available control measure (RACM) analysis; NO<INF>X</INF> waiver revisions; motor vehicle emissions budgets; and commitments to complete a mid-course review and to recalculate the motor vehicle emissions budgets using MOBILE6. Also, EPA is incorporating into the SIP a portion of an agreed order between U.S. Steel (currently USX Corporation) and the IDEM to establish a coke plant process water treatment plant at its Gary Works. We proposed approval of these SIP revision elements on August 3, 2001 (66 FR 40802).