Filter/separator. Fuel-quality monitor. Relaxation tank or equivalent piping. Shutoff valves for maintenance. Sample outlet. A high-level cutoff system. Low-intensity instrument lighting to permit full visibility of all equipment and controls during night operations. Spill containment system that will prevent the run- off of fuel in the event of tank rupture or a major spill during loading operations. Overhead lighting in the immediate truck-fueling area. RECEIVING STATIONS Fuel can be received by pipeline, barge, railroad tank car, tank truck, or any combination thereof. Re- ceiving stations are tailored to the method, quantities, and rates of fuel delivery. Aviation fuel should be received through a filter/separator or other appropri- ate filtration device. This is an essential requirement when fuel is received directly into an air station’s or facility’s operational storage tanks. Weight-handling equipment may be necessary with barge receipts to help with large-diameter-hose handling. Communica- tions equipment may be necessary for barge or pipe- line receipt to coordinate an uninterrupted product flow. Appropriate environmental protection equip- ment, facilities, and procedures must be provided to comply with Federal, state, and local environmental laws. STORAGE TANKS Tanks located at air activities provide the operat- ing supplies of aviation fuel for aircraft. Storage tanks are classified as bulk storage or operational storage. All tanks must comply with the following require- ments: All operational or ready-issue steel tanks must be 100 percent coated with an inert material such as polyurethane or epoxy. All bulk-steel fuel storage tanks must be coated on the bottom and up 18 inches on the walls. All concrete tanks storing aviation fuel must be 100 percent lined on the floor and walls to make them impervious to fuel. All aviation turbine fuel operational storage tanks must be equipped so the fuel can be circulated through a filter/separator and returned to the tank, thus removing any bottom sediment and water. Outlets must be at lowest point of the tank, to prevent water-bottoms. All aviation fuel tanks must also be equipped with a water-stripping sys- tem. Tank roofs must be in good repair and must not allow rainwater to enter. Fill connections for all types of tanks must be sized so that the velocity of the fuel during falling will not exceed 3 feet per second. Inlets discharge fuel hori- zontally near the bottom of the tank. All bulk storage tanks must be equipped with ade- quate sumps, drain lines, and water draw-off lines, so that tank water-bottoms can be kept to an abso- lute minimum. Recovery tanks that remove water and recover fuel are recommended for environ- mental reasons. All tanks must be fitted with automatic gageing devices and high- and low-level alarms and controls to prevent the overfilling of tanks and the exposure of pumps to cavitation. The alarms are left in the active mode at all times. All aboveground tanks must be within an enclosure capable of holding the entire capacity of the tank plus l-foot freeboard, in case the tank should rup- ture or leak. This is usually accomplished with impermeable dikes. Other environmental facilities/equipment as neces- sary to comply with Federal, state, and local laws. TRANSFER LINES Fuel passes through transfer pipelines of various diameters and construction materials in its route from tank to tank, storage to truck fill stands, and storage to hydrant systems. Transfer lines must not leak or intro- duce excessive contaminants to the fuel. Internally coated pipe or other noncorrosive materials in these lines should be used to reduce iron contamination in fuel. All piping systems are marked to identify the grade of product being carried. These markings 7-5