Approval and Promulgation of Air Quality Implementation Plans; State of Utah; Provo Attainment Demonstration of the Carbon Monoxide Standard, Redesignation to Attainment, Designation of Areas for Air Quality Planning Purposes, and Approval of Related Revisions

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EPA is proposing to approve State Implementation Plan (SIP) revisions submitted by the State of Utah. On April 1, 2004, the Governor of Utah submitted an attainment demonstration and plan for the Provo metropolitan area (hereafter, Provo area) for the carbon monoxide (CO) National Ambient Air Quality Standard (NAAQS) to replace the demonstration and plan that were submitted by Governor Leavitt on July 11, 1994. The Governor's submittal also contained a request to redesignate the Provo area to attainment for the CO NAAQS and a maintenance plan which includes transportation conformity motor vehicle emission budgets (MVEB) for 2014 and 2015. The Governor also submitted revisions to: Utah's Rule R307-110-12, "Section IX, Control Measures for Area and Point Sources, Part C, Carbon Monoxide," which incorporates the attainment demonstration, plan, and maintenance plan; Utah's Rule R307-110-31, "Section X, Vehicle Inspection and Maintenance Program, Part A," which incorporates general requirements and applicability for motor vehicle emissions inspections; and Utah's Rule R307-110-34, "Section X, Vehicle Inspection and Maintenance Program, Part D, Utah County," which incorporates a revised