Approval and Promulgation of Implementation Plans; Pennsylvania; Pennsylvania Regional Haze State Implementation Plan Revision: Sulfur Dioxide and Nitrogen Oxide Best Available Retrofit Technology Limits for the Cheswick Power Plant

The Environmental Protection Agency (EPA) is finalizing a limited approval and limited disapproval 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 the sulfur dioxide (SO<INF>2</INF>) and nitrogen oxide (NO<INF>X</INF>) Best Available Retrofit Technology (BART) requirements for Boiler Number 1 of the Cheswick Generating Station (Cheswick) in Allegheny County. EPA is finalizing a limited approval of the SIP revision for Cheswick's SO<INF>2</INF> and NO<INF>X</INF> BART requirements on the basis that the revision corrects an error in the SIP and strengthens the Pennsylvania SIP, while EPA is also finalizing a limited disapproval of this part of the SIP revision because the SIP revision relies on the Clean Air Interstate Rule (CAIR) and not the Cross-State Air Pollution Rule (CSAPR) which has replaced CAIR. This final action is in accordance with the requirements of the Clean Air Act (CAA) and EPA's rules for BART.