Approval and Promulgation of Implementation Plans; Tennessee; 110(a)(1) and (2) Infrastructure Requirements for the 2008 8-Hour Ozone National Ambient Air Quality Standards

EPA is taking final action to approve in part, and conditionally approve in part, the State Implementation Plan (SIP) submission, submitted by the State of Tennessee, through the Tennessee Department of Environment and Conservation (TDEC), to demonstrate that the State meets the infrastructure requirements of Clean Air Act (CAA or Act) for the 2008 8-hour ozone 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, which is commonly referred to as an "infrastructure" SIP. On October 19, 2009, TDEC made a SIP submission to certify that the Tennessee SIP already contains provisions that ensure the 2008 8-hour ozone NAAQS are implemented, enforced, and maintained in Tennessee (hereafter referred to as "infrastructure submission"). On March 23, 2012, TDEC submitted a letter requesting conditional approval of the infrastructure submission with respect to the requirements in its SIP applicable to state boards. On October 4, 2012, Tennessee submitted a letter requesting conditional approval of infrastructure submission with respect to requirements in its SIP with respect to requirements applicable to its permitting program for prevention of significant deterioration (PSD) increments. With the exception of elements pertaining to PSD increments and state board requirements, Tennessee's infrastructure submission, provided to EPA on October 19, 2009, addresses all the applicable infrastructure SIP requirements for the 2008 8-hour ozone NAAQS. At this time, there are no outstanding infrastructure submission requirements for Tennessee with respect to significant contribution to nonattainment or interference with maintenance of the 2008 8-hour ozone NAAQS.