310 CMR, § 30.665
The Department shall impose, and the owner or operator shall comply with, conditions in the facility's license that are designed to ensure that hazardous constituents which are identified pursuant to 310 CMR 30.666 and which are detected in the groundwater from a regulated unit do not exceed the concentration limits specified pursuant to 310 CMR 30.667. Such concentration limits shall not be exceeded in the uppermost aquifer underlying the waste management area at or beyond a point of compliance identified pursuant to 310 CMR 30.669 during the compliance period specified pursuant to 310 CMR 30.670. When hazardous constituents have been detected the groundwater from a regulated unit, the Department shall, in the facility's license, impose conditions which meet the requirements of 310 CMR 30.665. The Department may impose such conditions in the facility's license before hazardous constituents have been detected in the groundwater from a regulated unit.
310 CMR, § 30.665