Approval and Promulgation of Implementation Plans; North Carolina: Approval of Rocky Mount Supplemental Motor Vehicle Emissions Budget Update

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EPA is proposing to approve a revision to the North Carolina State Implementation Plan (SIP), submitted to EPA on February 7, 2011, by the State of North Carolina, through the North Carolina Department of Environment and Natural Resources, Division of Air Quality. North Carolina's February 7, 2011, submission supplements the original redesignation request and maintenance plan for Rocky Mount 1997 8-hour ozone area submitted on June 19, 2006, and approved by EPA on November 6, 2006. The Rocky Mount 1997 8-hour ozone area is comprised of Edgecombe and Nash Counties in North Carolina. The February 7, 2011, revision proposes to increase the safety margin allocated to motor vehicle emissions budgets to account for changes in the emissions model and vehicle miles traveled projection model. EPA is proposing approval of this SIP revision pursuant to section 110 of the Clean Air Act. North Carolina's SIP revision meets all the statutory and regulatory requirements, and is consistent with EPA's guidance.