Administrative Rules of Montana
Department 17 - ENVIRONMENTAL QUALITY
Chapter 17.56 - UNDERGROUND STORAGE TANKS PETROLEUM AND CHEMICAL SUBSTANCES
Subchapter 17.56.6 - Release Response and Corrective Action for Tanks Containing Petroleum or Hazardous Substances
Rule 17.56.604 - REMEDIAL INVESTIGATION
Current through Register Vol. 6, March 22, 2024
(1) In order to determine the full extent and location of soils contaminated by the release and the presence and concentrations of free and dissolved product contamination in the surface water and in ground water, owners and operators must conduct a remedial investigation of the release, the release site, and the surrounding area possibly affected by the release if any of the following conditions exist:
(2) After reviewing information required under ARM 17.56.602 and 17.56.603, the department may determine that no additional investigation or corrective action is necessary; however, the department may require the owners and operators to initiate and continue compliance monitoring as determined by the department.
(3) A remedial investigation generally is an expanded site assessment more detailed in scope than the initial response and abatement measures under ARM 17.56.602, which must define the nature, extent, and magnitude of contamination and identify threats to public health, welfare and to the environment. A remedial investigation work plan must be submitted to the department prior to implementation by the owners and operators. The department shall submit a copy of a work plan from any owner or operator who is or may be seeking reimbursement to the appropriate local government office with jurisdiction over corrective action of the release. The office shall respond with any comments within 15 days of receipt of the plan and the department shall approve or disapprove the plan within 15 days of receipt from the local government. The following information is required to complete the remedial investigation:
(4) If a remedial investigation has been conducted, owners and operators must submit a report containing the information collected under (3) within 120 days of release confirmation. If investigation extends beyond the time for submission of the report, owners and operators must also submit an additional follow-up completion report according to a schedule established by the department.
AUTH: 75-11-319, 75-11-505, MCA; IMP: 75-11-309, 75-11-505, MCA