EPA is approving an assortment of rules, submitted by Ohio on May 16, 2006, as amended on December 10, 2007, setting limits on sulfur dioxide (SO2) emissions. Most significantly, EPA is approving rules for Franklin, Stark, and Summit Counties and for one source in Sandusky County, rules that supersede regulations that EPA promulgated in 1976 as a Federal Implementation Plan (FIP). This action provides that the entire FIP for SO2 in Ohio will now be superseded by approved State limits. Consequently, EPA is rescinding the entire FIP. EPA is also approving several substantive rule revisions and approving numerous Ohio rules that update various company names and unit identifications. Finally, since this rulemaking resolves the issues, which led a court to remand the designation for a portion of Summit County to EPA for reconsideration, EPA is promulgating a designation of attainment for the presently undesignated portion of this county.