Washington Revised Code Title 49. Labor Regulations § 49.24.370. Director to make rules and regulations

The director of labor and industries shall establish such rules and regulations as he or she deems primarily necessary for the safety of the employees employed in tunnels, quarries, caissons, and subways and shall be guided by the most modern published studies and researches made by persons or institutions into the correction of the evils chargeable to improper safeguards and inspection of the tools, machinery, equipment, and places of work obtaining in the industries covered by RCW 49.24.080 through 49.24.380.