California Code, Health and Safety Code - HSC § 78125

(a) Those actions that are consistent with a permanent remedy, that are taken instead of, or in addition to, removal actions in the event of a release or threatened release of a hazardous substance into the environment, as further defined by Section 101(24) of the federal act (42 U.S.C. Sec. 9601(24)), except that any reference in Section 101(24) of the federal act (42 U.S.C. Sec. 9601(24)) to the President, relating to determinations regarding the relocation of residents, businesses, and community facilities shall, for the purposes of this part, be deemed to be a reference to the Governor and any other reference in that section to the President shall, for the purposes of this part, be deemed a reference to the Governor, or the director, if designated by the Governor.

(b) Those actions that are necessary to monitor, assess, and evaluate a release or a threatened release of a hazardous substance.

(c) Site operation and maintenance.