The Environmental Protection Agency (EPA) is approving a state implementation plan (SIP) revision submitted by the Commonwealth of Pennsylvania. This revision was submitted by the Pennsylvania Department of Environmental Protection (PADEP), on behalf of the Allegheny County Health Department (ACHD), to establish and require reasonably available control technology (RACT) for sources at PPG Industries Springdale Plant (PPG Springdale), a major source of volatile organic compounds (VOC), pursuant to the Commonwealth of Pennsylvania's conditionally approved RACT regulations.