Section 40.1020 - Background Levels of Oil and Hazardous Material(1) At any disposal site or portion of a disposal site where one or more remedial actions are undertaken to achieve a Permanent Solution, those remedial actions shall include, where feasible, one or more measures designed to reduce to the extent possible the concentrations of oil and hazardous material to levels that would exist in the absence of the disposal site of concern. Such measures shall, to the extent feasible, achieve or approach Background levels of oil and hazardous material in the environment as Background is defined in 310 CMR 40.0006.(2) No further response actions are required at any disposal site where the concentrations of oil and hazardous material in the environment have been reduced to Background levels.(3) The feasibility of reducing the concentrations of oil and hazardous material in the environment at a disposal site or portion of a disposal site to levels that achieve or approach Background levels shall be evaluated using the criteria described in 310 CMR 40.0860, except where it can be demonstrated that Background levels have been met.Amended by Mass Register Issue 1407, eff. 12/27/2019.Amended by Mass Register Issue 1503, eff. 3/1/2024.Amended by Mass Register Issue S1516, eff. 3/1/2024.