Health and Safety Code § 78790
ARTICLE 5. Listing of Hazardous Substance Release Sites
The department, or, if appropriate, the regional board, is the state agency with sole responsibility for ensuring that required action in response to a hazardous substance release or threatened release at a listed site is carried out in compliance with the procedures, standards, and other requirements set forth in this part, and shall, as appropriate, coordinate the involvement of interested or affected agencies in the response action.