“Remedial investigation” means those actions deemed necessary by the department to determine the full extent of a hazardous substance release at a site, identify the public health and environment threat posed by the release, collect data on possible remedies, and otherwise evaluate the site for purposes of developing a remedial action plan.
Source:
Section 25322.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=25322.2..