The department shall be the sole and paramount administrative agency responsible for the administration of the provisions of this chapter, and any other agency of the state or any municipal corporation or political subdivision of the state having administrative authority over the inspection, survey, investigation, or any regulatory or enforcement authority of safety and health standards related to the health and safety of employees in any workplace subject to this chapter, shall be required, notwithstanding any statute to the contrary, to exercise such authority as provided in this chapter and subject to interagency agreement or agreements with the department made under the authority of the interlocal cooperation act (chapter
39.34 RCW) relative to the procedures to be followed in the enforcement of this chapter: PROVIDED, That in relation to employers using or possessing sources of ionizing radiation the department of labor and industries and the department of social and health services shall agree upon mutual policies, rules, and regulations compatible with policies, rules, and regulations adopted pursuant to chapter
70A.388 RCW insofar as such policies, rules, and regulations are not inconsistent with the provisions of this chapter.