Approval and Promulgation of State Implementation Plans; Interstate Transport for Utah

The Environmental Protection Agency (EPA) is proposing action on a portion of a January 31, 2013 submission and a December 22, 2015 supplemental submission from the State of Utah that are intended to demonstrate that the State Implementation Plan (SIP) meets certain interstate transport requirements of the Clean Air Act (Act or CAA) for the 2008 ozone National Ambient Air Quality Standards (NAAQS). Specifically, the EPA is proposing to approve interstate transport prong 1 for the 2008 ozone NAAQS.