Mont. Code Ann. § 75-20-231
Expedited review
75-20-231 . Expedited review. (1) Except as provided in 75-1-208 (4)(b), the department shall issue a certification decision within 90 days from the date on which an application is considered complete for a facility that:
(a) is unlikely to result in significant adverse environmental impacts based on the criteria listed in 75-20-232 ; or
(b) is presently in existence and proposed for upgrade, reconstruction, or relocation and is unlikely to result in significant impacts pursuant to 75-20-232 .
(2) A facility that qualifies for expedited review is exempt from undergoing an alternative siting study, except as provided in 75-1-201 .