Approval and Promulgation of Air Quality Implementation Plans; New Hampshire; Nonattainment New Source Review and Prevention of Significant Deterioration Program

The Environmental Protection Agency (EPA) is proposing to conditionally approve the New Hampshire November 15, 2012 State Implementation Plan (SIP) revisions that are intended to ensure that the State's Prevention of Significant Deterioration (PSD) and Nonattainment New Source Review (NNSR) programs are consistent with the federal PSD and NNSR program requirements. In a letter dated March 20, 2015, the New Hampshire Department of Environmental Services (NH DES) committed to revising its regulations no later than one year from the date when EPA publishes a notice of final conditional approval, and to submitting the revised regulations to EPA for approval into the SIP. EPA is also proposing to fully approve a July 1, 2003 SIP revision that clarifies two definitions related to New Hampshire's permitting programs. These actions are being taken in accordance with the Clean Air Act (CAA).