Rule 17.50.1617 - LANDFARM FACILITY REMEDIATION STANDARDS(1) Contaminated soils are considered remediated when: (a) contaminant concentrations listed in Montana Risk-based Corrective Action Guidance for Petroleum Releases, Table 1 (February 2024) are permanently reduced to the residential RSBL concentrations.(2) When contaminated soil remediation in a treatment zone is complete, the owner or operator of a landfarm facility may: (a) remove the remediated material and replace it with additional contaminated soils for treatment;(b) apply an additional lift to the treatment zone for treatment if: (i) the maximum depth of remediated soil within the treatment cell, including the additional lift, does not exceed a depth of five feet; and(ii) BTZ sampling is conducted pursuant to ARM 17.50.1613; or(c) close and reclaim the treatment cell.(3) If the contaminant concentration standards in (1) cannot be attained, the department may approve post-remediation uses for these contaminated soils if the owner or operator of a landfarm facility submits a request to the department that: (a) demonstrates through analytical results that contaminant degradation has reached a maximum using the analytical methods and standards outlined in ARM 17.50.1612 and 17.50.1613; and(b) verifies the treatment cell and treatment zone are in compliance with this subchapter.(4) The owner or operator of a landfarm facility may not supply or use soils for any purpose exceeding the contaminant concentrations specified in Montana Risk-based Corrective Action Guidance for Petroleum Releases, Table 1 (February 2024).(5) The owner or operator of a landfarm facility may not supply, and a person may not use, remediated soils in any location that threaten human health and the environment, for residential topsoil, or for any purpose in school playgrounds or daycare centers.Mont. Admin. r. 17.50.1617
NEW, 2017 MAR p. 285, Eff. 3/11/2017; AMD,2019 MAR p. 174, Eff.2/9/2019; AMD, 2024 MAR p. 1062, Eff. 5/11/2024AUTH: 75-10-204, MCA; IMP: 75-10-204, MCA