EPA is approving three state implementation plan (SIP) revisions submitted on March 17, July 8 and July 13, 1994, by the State of Tennessee, through the Tennessee Air Pollution Control Division. The revisions submitted March 17, 1994, modify the existing basic motor vehicle inspection and maintenance (I/M) program in Davidson County to meet the requirements of the EPA I/M regulations, as published on November 5, 1992. The revisions submitted on July 8 and July 13, 1994, establish and require the implementation of a basic I/M program in the four middle Tennessee counties of Rutherford, Sumner, Williamson, and Wilson. These counties, along with Davidson County, form the Nashville ozone nonattainment area. The regulations establishing the I/M program constituted the July 8, 1994, submittal while the nonregulatory components of the program were discussed in the July 13, 1994, submittal.