Approval and Promulgation of Air Quality Implementation Plans; Montana; Revisions to the Administrative Rules of Montana-Air Quality, Subchapter 7, Exclusion for De Minimis Changes

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EPA is proposing to partially approve and partially disapprove State Implementation Plan (SIP) revisions submitted by the State of Montana on June 25, 2010 and May 28, 2003. The revisions contain new and amended rules in Subchapter 7 (Permit, Construction, and Operation of Air Contaminant Sources) that pertain to the issuance of Montana air quality permits, in addition to other minor administrative changes to the Administrative Rules of Montana. The intended effect of this action is to propose to approve the rules that are approvable and to propose to disapprove the rules that are inconsistent with the Clean Air Act (CAA.) This action is being taken under section 110 and 112 of the CAA.