(1) A Montana air quality permit is in effect until the permit is revoked under ARM 17.8.763, amended under ARM 17.8.764, or modified under ARM 17.8.748. Portions of a Montana air quality permit may be revoked, amended, or modified without invalidating the remainder of the permit.

(2) A permit issued prior to construction or installation of a new or modified facility or emitting unit may provide that the permit or a portion of the permit will expire unless construction or installation is commenced within the time specified in the permit, which may not be less than one year or more than three years after the permit is issued.

History: 75-2-111, 75-2-204, MCA; IMP, 75-2-211, MCA; NEW, 2002 MAR p. 3567, Eff. 12/27/02.