Approval of Implementation Plans; Wisconsin; Clean Air Interstate Rule

EPA is partially approving and partially disapproving a revision to the Wisconsin State Implementation Plan (SIP) submitted on June 19, 2007. The Wisconsin SIP revision was proposed for partial approval and partial disapproval on July 30, 2007. No comments were received during the comment period for the proposal. This revision incorporates provisions related to the implementation of EPA's Clean Air Interstate Rule (CAIR), promulgated on May 12, 2005, and subsequently revised on April 28, 2006, and December 13, 2006, and the CAIR Federal Implementation Plan (FIP) which concerns sulfur dioxide (SO<INF>2</INF>), oxides of nitrogen (NO<INF>X</INF>) annual, and NO<INF>X</INF> ozone season emissions for the State of Wisconsin, promulgated on April 28, 2006, and subsequently revised December 13, 2006. EPA is not making any changes to the CAIR FIP, but is, to the extent EPA approves Wisconsin's SIP revision, amending the appropriate appendices in the CAIR FIP trading rules simply to note that approval. EPA is approving an abbreviated SIP revision that addresses the methodology to be used to allocate annual and ozone season NO<INF>X</INF> allowances under the CAIR FIP, except for allowances in the compliance supplement pool. The portions of Wisconsin's submittal (those associated with the compliance supplement pool and Superior Environmental Performance) that EPA is disapproving are inconsistent with CAIR and/or otherwise inappropriate to include in a CAIR SIP and must, therefore, be disapproved.