California Code, Health and Safety Code - HSC § 80585

Notwithstanding Section 80575, if a regional board has issued a cleanup order or entered into a written voluntary agreement under Division 7 (commencing with Section 13000) of the Water Code for a site and the department has issued an order or entered into an enforceable agreement under Chapter 6.5 (commencing with Section 25100) of Division 20 or this part, the regional board and the department shall consult and determine which agency shall be the administering agency for the site under this chapter.