Approval and Promulgation of State Implementation Plan Revisions; Infrastructure Requirements for the 1997 8-Hour Ozone National Ambient Air Quality Standard; Colorado

EPA is approving the State Implementation Plan (SIP) submission from the State of Colorado to demonstrate that the SIP meets the requirements of Sections 110(a)(1) and (2) of the Clean Air Act (CAA) for the National Ambient Air Quality Standards (NAAQS) promulgated for ozone on July 18, 1997. Section 110(a)(1) of 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" of section 110(a)(2). The State of Colorado submitted a certification, dated January 7, 2008, that its SIP met these requirements for the 1997 ozone NAAQS. The certification was determined to be complete on March 27, 2008 (73 FR 16205).