Cal. Health & Safety Code § 79100
(a) The department shall not agree to oversee the preparation of, or to review, a preliminary endangerment assessment for property if action is, or may be, necessary to address a release or threatened release of a hazardous substance, and the department shall not issue a letter stating that no further action is necessary with regard to property, unless the person who made the request does either of the following:
(1) Provides the department with all of the following:
(c)