Cal. Health & Safety Code § 25264
(a) The administering agency for a hazardous materials release site shall supervise all aspects of a site investigation and remedial action conducted by the responsible party and, for that purpose, the administering agency shall, notwithstanding any other provision of law, including, but not limited to, this division and Division 7 (commencing with Section 13000) of the Water Code, have sole jurisdiction over all activities that may be required to carry out a site investigation and remedial action necessary to respond to the hazardous materials release at the site. For purposes of this chapter, the administering agency shall do all of the following:
(c) Except as otherwise provided in Section 25265 and this subdivision, the issuance of a certificate of completion by the administering agency shall constitute a determination that the responsible party has complied with the requirements of all state and local laws, ordinances, regulations, and standards that are applicable to the site investigation and remedial action for which the certificate is issued.
Except as provided in Section 25265, no agency, other than the administering agency, that has jurisdiction over hazardous materials releases pursuant to those state and local laws, ordinances, or regulations may take action against the responsible party with respect to the hazardous materials release that was the subject of the site investigation and remedial action for which a certificate of completion is issued and the administering agency may take action against the responsible party with respect to the hazardous materials release that was the subject of the site investigation and remedial action for which a certificate of completion is issued only if the administering agency determines that one or more of the following applies:
(d)
(1) Except as provided in Section 25265, the administering agency shall be the sole agency responsible for determining if any of the conditions described in paragraphs (1) to (6), inclusive, of subdivision (c) are applicable to a hazardous materials release site for which a certificate of completion has been issued pursuant to subdivision (b), and for taking any action that is deemed necessary if that determination is made. Any agency, other than the administering agency, that has information that any of those conditions applies to the hazardous materials site shall provide the administering agency with that information and the administering agency shall, within 45 calendar days of receipt of the request, do all of the following: