Approval and Promulgation of Implementation Plans and Designation of Areas for Air Quality Planning Purposes; MI; Redesignation of Grand Rapids, Kalamazoo-Battle Creek, Lansing-East Lansing, Benzie County, Huron County, and Mason County 8-Hour Ozone Nonattainment Areas to Attainment for Ozone

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EPA is proposing to make determinations under the Clean Air Act (CAA) that the nonattainment areas of Grand Rapids (Kent and Ottawa Counties), Kalamazoo-Battle Creek (Calhoun, Kalamazoo, and Van Buren Counties), Lansing-East Lansing (Clinton, Eaton, and Ingham Counties), Benzie County, Huron County, and Mason County have attained the 8-hour ozone National Ambient Air Quality Standard (NAAQS). These determinations are based on two three-year periods of complete, quality-assured ambient air quality monitoring data for the 2002-2004 seasons and the 2003-2005 seasons that demonstrate that the 8-hour ozone NAAQS have been attained in the areas. EPA is proposing to approve requests from the State of Michigan to redesignate the Grand Rapids, Kalamazoo-Battle Creek, Lansing-East Lansing, Benzie County, Huron County, and Mason County areas to attainment of the 8-hour ozone NAAQS. The Michigan Department of Environmental Quality (MDEQ) submitted these requests on May 9, 2006 and supplemented them on May 26, 2006 and August 25, 2006. In proposing to approve these requests, EPA is also proposing to approve, as revisions to the Michigan State Implementation Plan (SIP), the State's plans for mai