Approval and Promulgation of Air Quality Implementation Plans; Tennessee; Approval of Revisions to the Knox County Portion of the Tennessee State Implementation Plan-“Permit by Rule” Provision

EPA is taking direct final action to approve the State Implementation Plan (SIP) revision submitted by the State of Tennessee on October 12, 2007. The revision pertains to the Knox County portion of the Tennessee SIP and includes changes to Knox County Air Quality Management Regulation (Knox County Regulation) Section 25.10--Permit by Rule. Specifically, Section 25.10 was changed so that it clearly states that turbines and other internal combustion engines are excluded from the "Permit by Rule" provision. This revision is considered by the Tennessee Department of Environment and Conservation (TDEC), to be as or more stringent than the State of Tennessee's SIP requirements. This action is being taken pursuant to section 110 of the Clean Air Act (CAA).