(a) Sections 22-14 and 22-71, regarding the storage and use of explosives, apply to licensees and licensed quarries.
(b) The operation of any quarry must not cause vibration by blasting, equipment operation, or any high-energy impulse that exceeds a peak particle velocity of 1 inch per second.
(c) The maximum allowable air blast must not exceed 130 linear decibels peak through the frequency range of 6-200 hertz.
(d) (1) On request of the Director, a licensee must produce a seismographic record, using response spectrum analysis, of each blast.
(2) The Director must approve the measurement method and instrumentation necessary to comply with this Section.
(3) The licensee must employ a person who is competent to use an approved instrument that has been calibrated according to the manufacturer's specifications.
(4) Vibration and air blast must be measured at the property line of the nearest occupied building that is not owned or leased by the licensee.
(e) The licensee must promptly report to the Director each blast or high-energy impulse that exceeds the standards set in subsections (b) and (c). (Mont. Co. Code 1965, § 98-13; 1981 L.M.C., ch. 30, § 1; 1992 L.M.C., ch. 1, § 1.)
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