310 CMR, § 30.670
In the facility's license, the Department shall specify the compliance period during which the requirements of 310 CMR 30.665: Groundwater Protection Standard shall apply. In no event shall the duration of the compliance period be less than the duration of the active life of the waste management area, including, without limitation, the period prior to licensing, and the closure period. The compliance period shall begin when the owner or operator initiates a compliance monitoring program meeting the requirements of 310 CMR 30.671. If the owner or operator is engaged in a corrective action program, the compliance period shall not end until the owner or operator has persuaded the Department, and the Department has determined in writing, that the requirements of 310 CMR 30.665 have been complied with for a period of at least three consecutive years.
310 CMR, § 30.670