Approval and Promulgation of State Implementation Plan Revisions; Infrastructure Requirements for the 1997 8-hour Ozone National Ambient Air Quality Standards; South Dakota

EPA is approving the State Implementation Plan (SIP) submission from the State of South Dakota to demonstrate that the SIP meets the requirements of the Clean Air Act (CAA) for the National Ambient Air Quality Standards (NAAQS) promulgated for ozone on July 18, 1997. The CAA requires that each state, after a new or revised NAAQS is promulgated, review their SIPs to ensure that they meet the requirements of the "infrastructure elements". The State of South Dakota submitted a certification, dated February 1, 2008, that its SIP met these requirements for the 1997 ozone NAAQS; the certification was determined to be complete on March 27, 2008. In addition, EPA is partially approving a June 14, 2010 SIP submittal from the State that revises the State's Prevention of Significant Deterioration (PSD) program.