Approval and Promulgation of Air Quality Implementation Plans; Wisconsin; Approval of Revision to PSD Program

The Environmental Protection Agency (EPA) is taking final action to approve a revision to the Wisconsin State Implementation Plan (SIP) submitted by the Wisconsin Department of Natural Resources (WDNR) to EPA on March 12, 2014, for parallel processing. On August 11, 2014, WDNR submitted an updated submittal with the final rules. The submittal modifies Wisconsin's Prevention of Significant Deterioration (PSD) program to identify precursors for particulate matter of less than 2.5 micrometers (PM<INF>2.5</INF>), includes the significant emissions rates for PM<INF>2.5</INF> and emissions of particulate matter of less than 10 micrometers (PM<INF>10</INF>), and modifies the definition of PM<INF>2.5</INF> and PM<INF>10</INF> to include emissions that may condense to form particulate matter in permitting decisions. WDNR requested this revision to address disapprovals of two submissions meant to address requirements of the 2008 Implementation of the New Source Review (NSR) Program for PM<INF>2.5</INF> and to address a partial disapproval under section 110 of the Clean Air Act (CAA) of what is commonly referred to as an "infrastructure" SIP. EPA is taking final action to approve Wisconsin's August 11, 2014, final SIP revision because the Agency has made the determination that this SIP revision is in accordance with the CAA and applicable EPA regulations regarding PSD. The proposed rulemaking was published June 30, 2014. During the comment period which ended July 30, 2014, no comments were received.