Montana Title 75. Environmental Protection § 75-10-737. Voluntary action to preclude remedial action by department

If a party has elected to undertake an approved voluntary cleanup and is diligently proceeding to implement the plan, the department may not, except as provided in 75-10-712, take remedial action under 75-10-711 with regard to those releases or threatened releases of hazardous or deleterious substances that are addressed by the approved voluntary cleanup plan.