California Code, Health and Safety Code - HSC § 25395.101

(a) Except as expressly provided in this article, this article does not affect the authority of an agency to issue an order or take any other action under any provision of law to protect public health and safety or the environment.

(b) Except as otherwise expressly provided in this article, this article does not affect the authority of the agency or any other public agency to pursue any existing legal, equitable, or administrative remedies pursuant to state or federal law.

(c) Except as otherwise expressly provided in this article, Chapter 6.8 (commencing with Section 25300) does not apply to this article.

(d) If a local agency determines that, due to an emergency, it is necessary to gain access to a site that is the subject of a finding of no further action or a certificate of completion, the person who has obtained immunity pursuant to this chapter with regard to that site shall allow the local agency access to the site to take any action necessary to mitigate that emergency, or take any other necessary response action. However, that person shall not be required to pay for, or undertake, any of those actions taken by or required by the local agency, unless the person caused or contributed to the release at the site that constituted the emergency.