Rule 17.8.142 - REHEARING PROCEDURES-BOARD REVIEW(1) The board must act within a reasonable time to grant or deny petitioner's request for rehearing, but in no event shall such time exceed 30 days following receipt of said petition.(2) Procedure shall be in accordance with the rules of procedure for adversary or contested cases if the original hearing concerned enforcement, emergency procedures or where adjudicated facts were at issue; if the original hearing concerned variance procedure, substantive rulemaking or the establishment of local air pollution control programs, rules of procedure for appellate type hearings will be used.Eff. 12/31/72; TRANS, from DHES, 1996 MAR p. 2285.75-2-111, MCA; IMP, 75-2-411, MCA;