California Code, Public Resources Code - PRC § 43506

(a) After receiving a complete closure plan and postclosure maintenance plan, the regional water board shall approve or disapprove the plans pursuant to the authority and time schedules specified in Division 7 (commencing with Section 13000) of the Water Code.  The board shall incorporate the action of the regional water board and shall only approve plans that include an acceptable mechanism for providing the necessary funds to implement the plans.

(b) In reviewing closure plans and postclosure maintenance plans pursuant to this section, the regional water boards shall review and take action on those portions of the plans which are related to the protection of the waters of the state and the board shall review and take action on the remaining portions of the plans.