Approval and Promulgation of Implementation Plans; Prevention of Significant Deterioration (PSD)

This final action revises implementation plans concerning the Prevention of Significant Deterioration (PSD) program mandated by part C of title I of the Clean Air Act (CAA or Act). These revisions include changes to incorporate newly promulgated paragraphs in the Federal PSD rule into the Federal Implementation Plan (FIP) portion of the State plan where a State agency does not have an approved PSD State Implementation Plan (SIP) in place. Specifically, the revisions provide a category of equipment replacement activities that are not subject to Major New Source Review (NSR) requirements under the routine maintenance, repair and replacement (RMRR) exclusion. The changes are intended to provide greater regulatory certainty without sacrificing the current level of environmental protection and benefit derived from the NSR program, and to ensure comprehensive and consistent implementation of the Federal PSD program by State, local, and tribal agencies where EPA has determined that they have the responsibility to implement the Federal PSD program.