California Code, Health and Safety Code - HSC § 25297.15

(a)(1) The local agency shall not consider cleanup or site closure proposals from the primary or active responsible party, issue a closure letter, or make a determination that no further action is required with respect to a site upon which there was an unauthorized release of hazardous substances from an underground storage tank subject to this chapter unless all current record owners of fee title to the site of the proposed action have been notified of the proposed action by the primary or active responsible party.

(2) Notwithstanding subdivision (g) of Section 25297.1, the local agency shall also notify the primary or active responsible party of their responsibility under this subdivision.

(3) The primary or active responsible party shall certify to the local agency in writing that the notification requirement in this subdivision has been met and provide a complete mailing list of all record fee title owners to the local agency.