Every employer of persons for work in compressed air shall:

(1) Keep at the place of work at all necessary times a duly qualified medical officer to care for cases of illness and to administer strictly and enforce RCW 49.24.020 and 49.24.040;

(2) Keep at a medical lock required by RCW 49.24.020(9) a certified nurse selected by the medical officer required by subdivision (1) of this section and qualified to give temporary relief in cases of illness.