Protective equipment, including but not limited to personal protective equipment for eyes, face, head and extremities, protective clothing, respiratory devices, and protective shields and barriers, may be required and shall be maintained in the sanitary and reliable condition wherever it is necessary by reason of hazards of process or environment, chemical hazards, or mechanical hazard encountered in a manner capable of causing injury or impairment in the function of any part of the body through absorption, inhalation or physical contact. Marks location of existing distribution mains, services and transmission mains for contractors, cities and other excavators to avoid damages to the Distribution System.