California Code, Health and Safety Code - HSC § 80570

(a) Except as provided in subdivision (b) and Section 80575, upon the request of a regional board or the state board, the administering agency for any site that is the subject of a loan approved under Article 7 (commencing with Section 80480) shall be a regional board, the state board, or a local oversight program agency under contract with the state board in accordance with Chapter 6.7 (commencing with Section 25280) of Division 20 and Chapter 6.75 (commencing with Section 25299.10) of Division 20, if the property is subject to a release from a leaking underground fuel tank and the release from the leaking underground fuel tank is the principal threat at that property, as determined by the regional board, the state board, and the department.

(b) If the site specified in subdivision (a) was not subject to oversight by a local oversight program agency prior to the date the loan application was submitted to the department pursuant to Article 6 (commencing with Section 80450), the regional board shall serve as the administering agency.

(c) Any response action for a property subject to this section for a leaking underground fuel tank shall be carried out under Chapter 6.65 (commencing with Section 25260), Chapter 6.7 (commencing with Section 25280), and Chapter 6.75 (commencing with Section 25299.10) of Division 20.