Approval and Promulgation of Air Quality Implementation Plans; Montana; Revisions to the Administrative Rules of Montana; New Source Performance Standards for Montana; Final Rule
EPA is approving State Implementation Plan (SIP) revisions submitted by the State of Montana on August 20, 2003, except for revisions to three rules that EPA will act on at a later date. The revisions modify definitions and references to federal regulations and other materials in the Administrative Rules of Montana. The intended effect of this action is to make federally enforceable those provisions that EPA is approving. This action is being taken under section 110 of the Clean Air Act.