Approval and Promulgation of Implementation Plans; Tennessee: Memphis/Shelby County Area Second 10-Year Maintenance Plan for the Carbon Monoxide National Ambient Air Quality Standard

EPA is approving a revision to the Tennessee State Implementation Plan (SIP) submitted in final form on May 17, 2006. The SIP revision provides the second 10-year maintenance plan for the Memphis/Shelby County Carbon Monoxide (CO) Maintenance Area. The second 10-year maintenance plan includes a new motor vehicle emission budget (MVEB) for CO for the year 2017. EPA is approving this SIP revision, including the new 2017 MVEB for CO, because it satisfies the requirement of the Clean Air Act (CAA) for the second 10-year maintenance plan for the Memphis/Shelby County Area. In addition, in this rulemaking, EPA is providing information on its transportation conformity adequacy determination for the new MVEB for the year 2017 that is contained in the second 10-year CO maintenance plan for the Memphis/Shelby County Area.