Cal. Health & Safety Code § 25266

The responsible party for a hazardous materials release site may, with the approval of the administering agency, terminate the application of this chapter to the site. The administering agency shall notify the committee, the advisory team, and any agency that may have jurisdiction over site investigation or remedial action at the site that the application of this chapter has been terminated. If the application of this chapter is terminated, the responsible party may not request the designation of another administering agency pursuant to Section 25262.