Approval and Promulgation of Air Quality Implementation Plans; Pennsylvania; NOX RACT Determination for Armco Inc., Butler Operations Main Plant and Butler Operations Stainless Plant in the Pittsburgh-Beaver Valley Area

EPA is taking direct final action to approve revisions to the Commonwealth of Pennsylvania's State Implementation Plan (SIP). The revisions were submitted by the Pennsylvania Department of Environmental Protection (PADEP) to establish and require reasonably available control technology (RACT) for Armco Inc., Butler Operations Main Plant and Butler Operations Stainless Plant, major sources of nitrogen oxides (NO<INF>X</INF>) located in the Pittsburgh-Beaver Valley ozone nonattainment area (the Pittsburgh area). EPA is approving these revisions to establish RACT requirements in the SIP in accordance with the Clean Air Act (CAA).