As used in this article, “hazardous material” shall have the same meaning as that term is defined in Section 25260 of the Health and Safety Code, except that under no circumstances shall petroleum which is naturally occurring on a site be considered a hazardous material.
Source:
Section 1263.711, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CCP§ionNum=1263.711..