Approval and Promulgation of Air Quality Implementation Plans; Montana; Revisions to the Administrative Rules of Montana-Air Quality, Subchapter 7, Subchapter 16 and Subchapter 17

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EPA is proposing to approve new rules and revisions as submitted by the State of Montana on September 23, 2011, as revisions to Montana's State Implementation Plan. Montana adopted these rules on December 2, 2005, and March 23, 2006. The new rules adopted on December 2, 2005, became state-effective on January 1, 2006; the new rules and revisions adopted on March 23, 2006, became state-effective on April 7, 2006. These new rules and revisions meet the requirements of the Clean Air Act and EPA's minor new source review regulations. The intended effect of this action is to propose to approve these rules as they are consistent with the Clean Air Act. This action is being taken under section 110 of the Clean Air Act.