Air Plan Approval; Wisconsin; Infrastructure SIP Requirements for the 2012 PM2.5

The Environmental Protection Agency (EPA) is finalizing approval of some elements of a July 13, 2015 state implementation plan (SIP) submittal from the Wisconsin Department of Natural Resources (WDNR) regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2012 fine particulate matter (PM2.5) National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA. The proposed rulemaking associated with this final action was published on February 19, 2016, and EPA received adverse comments during the comment period, which ended on March 21, 2016. Responses to comments are included below. In this rulemaking, EPA is not taking action on Wisconsin's satisfaction of the infrastructure requirements of CAA section 110(a)(2)(F), also referred to as ``element F,'' which pertains to stationary source monitoring and reporting. EPA proposed approval of and received an adverse comment on our proposed approval of element F, which will be addressed in a separate rulemaking. In this rulemaking we respond to the remainder of the comments we received on our initial proposed rulemaking, which includes those comments not pertaining to element F, and finalize as initially proposed our approval of the other elements of Wisconsin's 2012 PM2.5 infrastructure SIP.