California Code of Regulations
Title 23 - Waters
Division 3 - State Water Resources Control Board and Regional Water Quality Control Boards
Chapter 15 - Discharges of Hazardous Waste to Land
Article 5 - Water Quality Monitoring and Response Programs for Waste Management Units
Section 2550.12 - Corrective Action Where Hazardous Waste Has Been Discharged at Areas Other than Waste Management Units

(a) A discharger seeking waste discharge requirements for the treatment, storage or disposal of hazardous waste shall institute corrective action as necessary to protect human health and the environment for all releases of hazardous waste or hazardous constituents from any area at the facility other than a waste management unit regardless of the time waste was discharged at such an area.

(b) A program of corrective action required under subsection (a) of this section shall be incorporated into an enforcement order under Chapter 5, commencing with section 13300, of Division 7 of the Water Code, or into the waste discharge requirements and the program shall contain time schedules for implementation and completion of such corrective action. A discharger required to undertake corrective action under this section shall provide assurances of financial responsibility for completing such corrective action.

(c) The discharger shall implement corrective actions beyond the facility property boundary where necessary to protect human health or the environment.