A.R.S. § 27-370: Stench warning

A. The operator shall maintain a suitable and sufficient stench warning that can be introduced into the compressed airlines in case of an emergency and reach all employees who might be working underground.

B. When the odor from a stench warning is detected by employees or other persons, they shall immediately leave their working place or other areas underground, give warning to other employees or persons in their vicinity, and follow the operator's evacuation procedure.