In the event of an emergency involving danger to life, health or property as a result of damage to an underground facility containing gas or liquid petroleum products or as a result of an electrical short or escape of gas or hazardous fluids, the excavator shall:
(a) Proceed to evacuate his or her employees and all other endangered persons from the immediate vicinity to the best of his or her ability;
(b) Immediately notify 911 and the operator of the affected facility of the exact location, nature of the emergency and of the underground facility which is affected.