Lab. Code, § 144

(a) The authority of any agency, department, division, bureau or any other political subdivision other than the Division of Occupational Safety and Health to assist in the administration or enforcement of any occupational safety or health standard, order, or rule adopted pursuant to this chapter shall be contained in a written agreement with the Department of Industrial Relations or an agency authorized by the department to enter into such agreement.

(b) No such agreement shall deprive the Division of Occupational Safety and Health or other state agency to which authority has been delegated of any power or authority of the state agency.

(c) Such an agreement may provide for the right of access of an authorized representative of the designated agency to enter any place of employment which is under the jurisdiction of the Division of Occupational Safety and Health.

(d) If any representative of an agency operating under such an agreement becomes aware of an imminent hazard, he shall notify the employer and affected employees of the hazard and immediately notify the Division of Occupational Safety and Health.

(e) Nothing in this section shall affect or limit the authority of any state or local agency as to any matter other than the enforcement of occupational safety and health standards adopted by the board; however, nothing herein shall limit or reduce the authority of local agencies to adopt and enforce higher standards relating to occupational safety and health for their own employees.