RCW 49.24.180: Inspection.

While work is in progress, the employer shall employ a competent person who shall make a regular inspection at least once every working day of all engines, boilers, steam pipes, drills, air pipes, air gauges, air locks, dynamos, electric wiring, signaling apparatus, brakes, cages, buckets, hoists, cables, ropes, timbers, supports, and all other apparatus and appliances; and he or she shall immediately upon discovery of any defect, report same in writing to the employer, or his or her agent in charge.