Clean Air Act Approval and Promulgation of State Implementation Plan; Colorado; Revisions Regarding Negligibly Reactive Volatile Organic Compounds and Other Regulatory Revisions

EPA approves three revisions to the Colorado State Implementation Plan (SIP). The SIP revisions being approved include: an update to the State's list of negligibly reactive volatile organic compounds (VOCs) to add acetone. The State also consolidated the list of negligibly reactive VOCs from Regulations No. 3 and 7 into the Common Provisions Regulation. These revisions were submitted for approval on September 16, 1997; a clarification to the definition of ``applicable requirement'' and corrections of typographical errors in parts A and B of Colorado Regulation No. 3. These revisions were also submitted on September 16, 1997; and an update to the list of negligibly reactive VOCs in the Common Provisions Regulation to add perchloroethylene. The State also repealed its requirements in Regulation No. 7 that required control of VOC emissions from dry cleaning facilities using perchloroethylene as a solvent. These revisions were submitted for approval on August 19, 1998. We approve these revisions because they are consistent with the requirements of the Clean Air Act (Act) and the Federal regulations.