Environmental Protection Agency June 15, 2017 – Federal Register Recent Federal Regulation Documents

The Environmental Protection Agency (EPA) is proposing to approve revisions to the South Coast Air Quality Management District (SCAQMD or District) portion of the California State Implementation Plan (SIP). These revisions concern the District's demonstration regarding Reasonably Available Control Technology (RACT) requirements for the 2008 8-hour ozone National Ambient Air Quality Standard (NAAQS) in the South Coast Air Basin and Coachella Valley ozone nonattainment areas. The EPA had previously proposed to partially approve and partially disapprove SCAQMD's RACT SIP demonstration. However, since publication of the proposed rule, SCAQMD has addressed the identified deficiency that was the basis for the proposed partial disapproval by completing additional analysis and by submitting the analysis to the EPA as a supplement to the RACT demonstration. Because the supplemental analysis adequately addresses the deficiency, the EPA is withdrawing the previous proposed action and is now proposing full approval of SCAQMD's RACT SIP demonstration for the 2008 ozone NAAQS, as recently supplemented. The action proposed herein is based on a public draft version of the SCAQMD RACT supplement, and the EPA will not take final action until submittal of the final version of the SCAQMD RACT supplement as a revision of the California SIP.

The Environmental Protection Agency (EPA) is conditionally approving the visibility transport (prong 4) portions of revisions to the Tennessee State Implementation Plan (SIP), submitted by the Tennessee Department of Environment and Conservation (TDEC), addressing the Clean Air Act (CAA or Act) infrastructure SIP requirements for the 2010 1-hour Nitrogen Dioxide (NO2), 2010 1-hour Sulfur Dioxide (SO2), and 2012 annual Fine Particulate Matter (PM2.5) National Ambient Air Quality Standards (NAAQS). The CAA requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each NAAQS promulgated by EPA, commonly referred to as an ``infrastructure SIP.'' Specifically, EPA is conditionally approving the prong 4 portions of Tennessee's March 13, 2014, 2010 1-hour NO2 and 2010 1-hour SO2 infrastructure SIP submission and December 16, 2015, 2012 annual PM2.5 infrastructure SIP submission. All other applicable infrastructure requirements for these SIP submissions have been or will be addressed in separate rulemakings.