EPA is taking final action to fully approve the operating permit programs of the Tennessee Department of Environment and Conservation and the Memphis-Shelby County Health Department. The Tennessee and Memphis-Shelby County operating permit programs were submitted in response to the directive in the 1990 Clean Air Act (CAA) Amendments that permitting authorities develop, and submit to EPA, programs for issuing operating permits to all major stationary sources and to certain other sources within the permitting authorities' jurisdiction. EPA granted interim approval to the Tennessee and Memphis-Shelby County operating permit programs on July 29, 1996. Tennessee and Memphis-Shelby County revised their programs to satisfy the conditions of the interim approval and this action approves those revisions. Other program changes made by Tennessee since the interim approval was granted are also being addressed in this action.