Approval and Promulgation of Implementation Plans; Mississippi: Prevention of Significant Deterioration; Greenhouse Gas Tailoring Rule Revision

요약

EPA is proposing to approve a portion of a draft revision to the Mississippi State Implementation Plan (SIP), submitted by the State of Mississippi, through the Mississippi Department of Environmental Quality (MDEQ), to EPA on September 14, 2010, for parallel processing. The proposed SIP revision modifies Mississippi's New Source Review (NSR) Prevention of Significant Deterioration (PSD) program. Specifically, the proposed SIP revision establishes appropriate emission thresholds for determining which new stationary sources and modification projects become subject to Mississippi's PSD permitting requirements for their greenhouse gas (GHG) emissions. Mississippi's September 14, 2010, SIP revision is necessary because without it, on January 2, 2011, PSD requirements would apply at the 100 or 250 tons per year (tpy) levels provided under the Clean Air Act (CAA or Act), which would overwhelm Mississippi's permitting resources. EPA is proposing approval of Mississippi's September 14, 2010, SIP revision relating to PSD requirements for GHG-emitting sources because the Agency has made the preliminary determination that this SIP revision is in accordance with the CAA and EPA regulations reg