Approval and Promulgation of Implementation Plans; South Carolina; Regional Haze State Implementation Plan

The Environmental Protection Agency (EPA) is issuing a supplement to its proposed approval of a revision to the South Carolina State Implementation Plan (SIP) submitted by the State of South Carolina through the South Carolina Department of Health and Environmental Control (SC DHEC) on December 28, 2012. South Carolina's SIP revision (Progress Report) addresses requirements of the Clean Air Act (CAA or Act) and EPA's rules that require each state to submit periodic reports describing progress towards reasonable progress goals (RPGs) established for regional haze and a determination of the adequacy of the state's existing SIP addressing regional haze (regional haze plan). EPA's proposed approval of South Carolina's Progress Report was published in the Federal Register on January 17, 2014. This supplemental proposal addresses the potential effects on EPA's proposed approval from the April 29, 2014, decision of the United States Supreme Court (Supreme Court) remanding to the United States Court of Appeals for the District of Columbia Circuit (D.C. Circuit) EPA's Cross-State Air Pollution Rule (CSAPR) for further proceedings and the D.C. Circuit's July 28, 2015, decision on remand.