Approval and Promulgation of Air Quality Implementation Plans; State of Utah; Salt Lake and Davis Counties Ozone Redesignation to Attainment, Designation of Areas for Air Quality Planning Purposes, Approval of Related Elements, Approval of Partial NOINFX/INF RACT Exemption, and Approval of Weber County I/M Program

On May 23, 1997, EPA published a notice of proposed rulemaking (NPR) that proposed to approve the State of Utah's request to redesignate the Salt Lake and Davis Counties (SLDC) moderate ozone nonattainment area to attainment. In that NPR, EPA also proposed to approve the maintenance plan for the SLDC area, and the following related State Implementation Plan (SIP) elements: the 1990 base year emissions inventory, Reasonably Available Control Technology (RACT) for Volatile Organic Compounds (VOC), Nitrogen Oxides (NO<INF>X</INF>) RACT for Kennecott's Utah Power Plant and for the Pacificorp Gadsby Power Plant, and the Basic Inspection and Maintenance (I/M) and Improved I/M provisions for Salt Lake and Davis Counties. EPA also proposed to approve a partial NO<INF>X</INF> RACT exemption request. In this final rulemaking, EPA is approving the redesignation request, the maintenance plan, the various related SIP elements, and the partial NO<INF>X</INF> RACT exemption request. In the May 23, 1997, NPR, EPA also proposed to give limited approval to the State's generic VOC RACT and generic NO<INF>X</INF> RACT rules and to approve the I/M provisions for Weber County. In this rulemaking, EPA is giving limited approval to the VOC and NO<INF>X</INF> generic RACT rules and is approving the I/M provisions for Weber County.