Administrative Rules of Montana
Department 17 - ENVIRONMENTAL QUALITY
Chapter 17.56 - UNDERGROUND STORAGE TANKS PETROLEUM AND CHEMICAL SUBSTANCES
Subchapter 17.56.7 - Out-of-Service UST Systems and Closure
Rule 17.56.702 - PERMANENT CLOSURE AND CHANGES IN SERVICE
Current through Register Vol. 6, March 22, 2024
(1) At least 30 days before beginning either permanent closure or a change in service under (2) and (3), the owner or operator shall notify the department of their intent to permanently close or make the change in service, unless such action is in response to corrective action already noticed to the department under subchapter 6. The required assessment of the excavation zone under ARM 17.56.703 must be performed after notifying the department, but before completion of the permanent closure or a change in service.
(2) To permanently close a tank or connected piping, the owner or operator shall empty and clean it by removing all liquids and accumulated sludges. All tanks or connected piping taken out of service permanently must also be either removed from the ground or, when approved by the department, filled with an inert solid material.
(3) Continued use of an UST system to store a nonregulated substance is considered a change in service. Before a change in service, the owner or operator shall empty and clean the UST system by removing all liquid, accumulated sludge, and all combustible and flammable vapors and conduct a site assessment in accordance with ARM 17.56.703.
(4) The cleaning and closure procedures in (5) must be used to comply with this rule.
(5) The department adopts and incorporates by reference the version in effect on January 1, 2018, of the following standards, specifications, and publications:
AUTH: 75-11-505, MCA; IMP: 75-11-505, MCA