Approval and Promulgation of Implementation Plans; Wisconsin

The purpose of this action is a final rulemaking on the State of Wisconsin's Prevention of Significant Deterioration (PSD) rules, Natural Resources (NR) 405.01 through NR 405.17, as a revision to the Wisconsin State Implementation Plan (SIP). The State developed these rules as Wisconsin's plan to prevent significant deterioration of air quality in areas designated as unclassifiable or attainment of the National Ambient Air Quality Standards (NAAQS), and to satisfy the requirements of part C of the Clean Air Act (Act). The Environmental Protection Agency (EPA) is approving these rules because they meet EPA's regulations governing State PSD programs (40 CFR 51.166). In addition to the PSD rules, Wisconsin has submitted rules as a revision to the SIP to establish breathable particulates (PM-10) as a basis for the determination of particle concentrations for permitting purposes under the PSD program and, therefore, tie the new source permit evaluations directly to human health standards. Finally, Wisconsin submitted revisions to its existing SIP that are intended to correct errors in content and style, to improve consistency, and to clarify existing policy and procedures.