Approval and Promulgation of Air Quality Implementation Plans; Colorado; Affirmative Defense Provisions for Malfunctions; Common Provisions Regulation

EPA is taking direct final action approving a State Implementation Plan (SIP) revision submitted by the State of Colorado on August 1, 2007. This revision establishes affirmative defense provisions for source owners and operators for excess emissions during periods of malfunction. The affirmative defense provisions are contained in the State of Colorado's Common Provisions regulation. The intended effect of this action is to approve only those portions of Colorado's Common Provisions regulation submitted on August 1, 2007 that relate to the affirmative defense for malfunctions. This action is being taken under section 110 of the Clean Air Act.