The EPA is conditionally approving the Ohio Environmental Protection Agency's (OEPA) State Implementation Plan (SIP) for Prevention of Significant Deterioration (PSD) provisions for attainment areas based on the State's December 5, 2000, letter of commitment to submit the needed changes to its program within one year of the final conditional approval. Ohio submitted a request for a SIP-approved PSD program on March 1, 1996. The request was supplemented on April 16, 1997, September 5, 1997, December 4, 1997, and April 21, 1998. Ohio Administrative Code (OAC) sections 3745-31-11 to 3745-31-20 contain the permitting provisions for areas attaining the national ambient air quality standards (NAAQS). The general provisions applying to both attainment and nonattainment areas are found in OAC sections 3745-31-01 to 3745- 31-10.