Cal. Health and Safety Code § 115093

(a) The department shall require, as a condition of issuing a license to receive, possess, or transfer radioactive materials, or devices or equipment utilizing radioactive materials, that the licensee take corrective action with regard to all contamination that results from the handling, use, storage, or transportation of radioactive materials at the licensee’s facility regardless of when the contamination commenced at the facility. (b) Any corrective action required pursuant to this section shall require that corrective action be taken beyond the facility boundary if necessary to protect human health and safety or the environment, unless the licensee demonstrates to the satisfaction of the department that, despite the licensee’s best efforts, the licensee is unable to obtain the necessary permission to undertake the corrective action. (c) When corrective action cannot be completed prior to issuance of the license, the license shall contain schedules of compliance for corrective action and assurances of financial responsibility for completing the corrective action.