The disposal facility shall be sited, designed, used, operated and closed to achieve long term stability of the disposal site and to eliminate to the extent practicable the need for ongoing active maintenance of the disposal site following closure so that only surveillance, monitoring or minor custodial care are required.
25 Pa. Code § 236.16
This section cited in 25 Pa. Code § 236.12 (relating to general requirement); and 25 Pa. Code § 236.314 (relating to enhanced containment).