Upon request of the emergency response authority, all City units shall provide any personnel, equipment and expertise as may be reasonably available to assist at the scene or immediate vicinity of a hazardous material incident taking into account the serious and immediate danger posed by hazardous material incidents. All personnel and equipment from each unit at a hazardous material incident scene or vicinity shall be under the direct supervision of the senior person from that unit or as otherwise provided by unit policy, except that the emergency response authority shall provide general supervisory control and authority at a hazardous material incident scene or vicinity and all City units and personnel shall cooperate with the emergency response authority accordingly. (Ord. 80-430; Ord. 01-42)