EPA is approving revisions to the Tennessee State Implementation Plan (SIP) submitted by the State of Tennessee through the Tennessee Department of Environment and Conservation (TDEC) on September 1, 1993, and April 9, 1998. The first revision adds definitions for particulate matter based upon the measurement of particles having an aerodynamic diameter of 10 microns or less (PM<INF>10</INF>). The second revision combines the Soda Recovery Boilers rule with the Kraft Mill Recovery Furnaces rule in the Visible Emission regulations.