California Code, Health and Safety Code - HSC § 25403.4

Within 60 days of being presented with a bill from the department or regional board, the local agency shall reimburse the department or the regional board for costs incurred in reviewing or approving investigation plans and cleanup plans pursuant to this chapter. The department or regional board may develop a payment plan, consistent with Section 25269, with the local agency to repay costs over a longer period of time. In the event of any dispute over the costs, the local agency shall pay any undisputed costs and meet and confer with the department or regional board to resolve the disputed items. In connection with any disputes not resolved through meet and confer efforts, the local agency may utilize any review processes maintained by the department or the regional board.