Approval and Promulgation of Air Quality Implementation Plans; Indiana

EPA is approving a request submitted by the Indiana Department of Environmental Management (IDEM) on July 20, 2007, as supplemented on December 19, 2007, to revise the Indiana State Implementation Plan (SIP). The submission revises the Indiana Administrative Code (IAC) by amending the definition of "References to the Code of Federal Regulations," to update the references to the Code of Federal Regulations (CFR) to refer to the 2006 edition. The rule revision also makes minor corrections to amend the definition of "nonphotochemically reactive hydrocarbons" or "negligibly photochemically reactive compounds," and to amend the definition of "volatile organic compound" or "VOC."