Approval and Promulgation of Air Quality Implementation Plans; Missouri; Reasonably Available Control Technology (RACT) for the 8-Hour Ozone National Ambient Air Quality Standard (NAAQS)

EPA is taking final action to conditionally approve a State Implementation Plan (SIP) revision submitted by the State of Missouri to EPA on January 17, 2007, with a supplemental revision submitted to EPA on June 1, 2011. The purpose of these SIP revisions is to satisfy the RACT requirements for volatile organic compounds (VOCs) set forth in the Clean Air Act (CAA or Act) with respect to the 8-hour ozone NAAQS. In addition to taking final action on the 2007 submission, EPA is also taking final action to approve several VOC rules adopted by Missouri and submitted to EPA in a letter dated August 16, 2011 for approval into its SIP. We are taking final action to approve these revisions because they enhance the Missouri SIP by improving VOC emission controls in Missouri. EPA's final action to conditionally approve the SIP submittal is consistent with section 110(k)(4) of the CAA. As part of the conditional approval, Missouri will be required to revise its rules to address one additional source category, no later than December 31, 2012.