Approval and Promulgation of State Implementation Plans; Wisconsin

The EPA is approving a revision to Wisconsin's State Implementation Plan (SIP) for the attainment of the one-hour ozone standard for the Milwaukee-Racine area. This SIP revision, submitted to EPA on December 16, 2002, allows emissions averaging for sources subject to the state's rules limiting emissions of nitrogen oxides (NO<INF>X</INF>) from large electricity generating units in southeast Wisconsin. In addition, the revision creates a new categorical emissions limit for new integrated gasification combined cycle units. On April 10, 2003, the EPA proposed approval of this SIP revision and published a direct final approval as well. EPA received adverse comments on the proposed rulemaking, and therefore withdrew the direct final rulemaking on June 6, 2003.