Air Plan Approval; Wisconsin; Attainment Plan for the Rhinelander SO2
The Environmental Protection Agency (EPA) is approving the State Implementation Plan (SIP) revision submitted by Wisconsin on March 29, 2021, which amends a SIP submission previously submitted to EPA on January 22, 2016, and supplemented on July 18, 2016 and November 29, 2016, for attaining the 1-hour sulfur dioxide (SO<INF>2</INF>) primary national ambient air quality standard (NAAQS) for the Rhinelander SO<INF>2</INF> nonattainment area. This plan (herein referred to as Wisconsin's Rhinelander SO<INF>2</INF> plan or plan) includes Wisconsin's attainment demonstration and other elements required under the Clean Air Act (CAA). In addition to an attainment demonstration, the plan addresses the requirement for meeting reasonable further progress (RFP) toward attainment of the NAAQS, reasonably available control measures and reasonably available control technology (RACM/RACT), and contingency measures. This action supplements a prior action which found that Wisconsin had satisfied emission inventory and new source review (NSR) requirements for this area, but had not met requirements for the elements approved here. In this action, EPA concludes that Wisconsin has appropriately demonstrated that the plan provisions provide for attainment of the 2010 1-hour primary SO<INF>2</INF> NAAQS in the Rhinelander SO<INF>2</INF> nonattainment area and that the plan meets the other applicable requirements under the CAA. EPA proposed to approve this action on July 22, 2021, and received no adverse comments.