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or out of a storage tank and in the manifold area of a pipeline terminal. These valves can be �f the �ar�ually operated ty�e or of the electric power operated type as shawn in Figure 8. Manually operated valves req�ire the presence of an individual to open and close fhe valve. Electric power operated vatves are motor driven and can be eq�ipped with a remote contro! feature. Power operated block valves can also be manually operated at the valve. Biock valves at the pipeline terminals in Roseville are shown schematically in Figure 14. Block valves in the Amoco Pipefine Company and Williams Pipe Line Company pipelines in and around the twin city area are shown in Figure 13. Block valves in Northem States Power Company's #ransmission and distribution systems are shown in Figures 9 and 10. Fire Prevent�on and Firefighting Foams Syratheti� foam� �re r�cr�gnized in the Unifc�rm Fire G�de as eff�ctive materials for preventing and extinguishing petroEeum product fires. They are available for frefighting purposes in two types: an Aqueous Film Forming Foam (AFFF) and an Aqueous Film Forming foam/Alcohol Type Concentrate (AFFF/ATC}. AFFF is a syntt�etic �irefighting foam concentrate designed for use on no�-palar, hydrocarbon hazards. When proportioned with water and applied with conventional foam or wateNfog equipment, AFFF provides excellent control and extinguishment of Class B fires by spreading a vapor-seaiing film over the fiquid fuel. This vapor seal inhibits reflash e�en when the foam blanket is ruptured and also allows the product to be used to secure non-ignited spills. AFFF provides excellent penetrating and wetting qualities when used on Class A fires. This is important when extinguishing deep- seated fires in wood, paper, rubber tires, and other ordinary combustibles. AFFF is available in 1°�, 3%, and 6% concentration. AFFF can be used with conventional foam equipment with fresh, sea, or brackish wate�. Self-educting foam noZZles and foam nozzles with in-line eductors are among the most common types of hardware for application. This foam can be applied to fi�es simultaneously with dry chemica! firefighting agents because the two are compatible. This foam material may be stored in its unopened shipping container without cF�ange in its originai physical or chemical characteristics. AFFF/ATC is a versatile firefighting foam for protection of a wide range of Class B f�ammable liquid hazards. AFFF/ATC is an all synthetic flm formi�g foam designed for protection of water sol�ble polar solvents as well as wa#er insoluble hydrocarbon 5-7