17.50.1811 GROUND WATER MONITORING
(1) An application for a TENORM waste management system license must contain a ground water monitoring plan that complies with ARM Title 17, chapter 50, subchapter 13; and contain a ground water sampling and analysis plan tailored to the types of TENORM waste being managed and site-specific conditions.
(2) During the active life of the waste management system and the closure and post-closure periods, a TENORM waste management system owner or operator shall have an independent qualified ground water scientist conduct semiannual monitoring for all constituents and parameters required in the ground water sampling and analysis plan and this rule.
(3) During the first semiannual monitoring event, a minimum of four independent samples must be collected from each background and downgradient well and analyzed in accordance with this rule.
(4) During subsequent semiannual monitoring events, a minimum of one sample must be collected from each background and downgradient well and analyzed in accordance with this rule.
(5) If the department determines that monitoring at an increased frequency is necessary to protect human health or the environment and notifies the owner or operator, the owner or operator shall monitor at the frequency determined by the department.
(6) The owner or operator of the TENORM waste management system shall monitor ground water for the constituents listed in ARM 17.50.1306 for Class II and Class IV landfills, the constituents in Table 1 of this rule, and any other constituent for which the department determines monitoring is necessary to protect public health or the environment.
Ground Water Monitoring Constituents
Exceedance Concentrations Above Background Radiation
Gross alpha (excluding uranium and radon)
Combined Ra-226 and Ra-228
30 micrograms per liter (μg/L)
(7) If monitoring detects results in an exceedance for any constituent identified in the ground water sampling and analysis plan and this rule, the owner or operator of the TENORM waste management system shall implement an assessment monitoring program and take corrective action under ARM Title 17, chapter 50, subchapter 13.
History: 75-10-204, MCA; IMP, 75-10-204, 75-10-207, MCA; NEW, 2020 MAR p. 1118, Eff. 6/27/20.