Approval and Promulgation of Implementation Plans; State of Iowa

Environmental Protection Agency (EPA) is approving revisions to the State Implementation Plan (SIP) for the State of Iowa. These revisions will amend the SIP to include revisions to Iowa air quality rule, Chapter 33, "Special Regulations and Construction Permit Requirements for Major Stationary Sources--Prevention of Significant Deterioration (PSD) of Air Quality." This rule amendment makes the state regulation consistent with the Federal regulation for the fine Particulate Matter (PM<INF>2.5</INF>) PSD program. This revision will amend source obligation provisions as they apply to recordkeeping and will provide a mechanism to allow industry to request rescission of a PSD permit, both of which match the Federal regulations. This action is also consistent with the state's request to not include, into the SIP, provisions relating to Significant Impact Levels (SILs) and Significant Monitoring Concentrations (SMCs). These provisions were vacated and remanded by the U.S. Court of Appeals for the District of Columbia on January 22, 2013.