Approval and Promulgation of Implementation Plans; Pennsylvania; Pennsylvania Regional Haze State Implementation Plan Revision-Particulate Matter Best Available Retrofit Technology Limit for the Cheswick Power Plant in Allegheny County

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The Environmental Protection Agency (EPA) is proposing approval of a revision to the Pennsylvania State Implementation Plan (SIP) submitted by the Commonwealth of Pennsylvania through the Pennsylvania Department of Environmental Protection (PADEP). This SIP revision addresses an error in the Best Available Retrofit Technology (BART) requirements for Boiler Number 1 of the Cheswick Generating Station (Cheswick) in Allegheny County. EPA is proposing approval of the portion of Pennsylvania's SIP revision addressing the particulate matter (PM) BART requirements as it is in accordance with the requirements of the Clean Air Act (CAA) and EPA's rules for BART.