Approval and Promulgation of Air Quality Implementation Plans; Wyoming; Revisions to Regional Haze State Implementation Plan

摘要

The Environmental Protection Agency (EPA) is proposing to approve a source-specific revision to the Wyoming State Implementation Plan (SIP) that provides an alternative to Best Available Retrofit Technology (BART) for Unit 3 at the Naughton Power Plant (``the SIP revision'') that is owned and operated by PacifiCorp. The EPA proposes to find that the BART alternative for Naughton Unit 3 would provide greater reasonable progress toward natural visibility conditions than BART in accordance with the requirements of section 110 of the Clean Air Act (CAA) and the EPA's Regional Haze Rule (RHR). The SIP revision was submitted by the State of Wyoming on November 28, 2017. The SIP revision for Naughton Unit 3 was submitted along with Wyoming's 5-year progress report, which is required under the Regional Haze Rule. However, the EPA is not proposing to act on the 5-year progress report in this rulemaking.