Approval and Promulgation of Air Quality Implementation Plans; South Dakota; Prevention of Significant Deterioration; Greenhouse Gas Tailoring Rule Revisions

The Environmental Protection Agency (EPA) is partially approving and partially disapproving revisions to the South Dakota State Implementation Plan (SIP) submitted by the South Dakota Department of Environment and Natural Resources (DENR) to EPA on June 20, 2011. The SIP revisions address the permitting of sources of greenhouse gases (GHGs). Specifically, we are approving revisions to the State's Prevention of Significant Deterioration (PSD) program to incorporate the provisions of the federal PSD and Title V Greenhouse Gas Tailoring Rule (Tailoring Rule). The SIP revisions incorporate by reference the federal Tailoring Rule's emission thresholds for determining which new stationary sources and modifications to existing stationary sources become subject to South Dakota's PSD permitting requirements for their GHG emissions. EPA is finalizing disapproval of a related provision that would rescind the State's Tailoring Rule revision in certain circumstances. EPA will take separate action on an amendment to the chapter Construction Permits for New Sources or Modifications in the June 20, 2011 submittal, regarding permits for minor sources. EPA is finalizing this action under section 110 and part C of the Clean Air Act (the Act or CAA).