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oil/water separator located at the west end of the yard. ii) Leakage during The equipment is inspected before placing it storage: in this area, and the area is inspected daily. Since the equipment is new or refurbished, meant for outdoor use, and is in storage for only a short time, it is not reasonably expected to leak during storage. 9) Operating Oil -Filled Eguioment a) Operating Substation The transformer bank has three aboveground transformers and regulators for 60 KV to 12 KV local distribution substation. These transformers are mounted on concrete pads and protected in a rock blotter. The regulators are also mounted on concrete pads. The entire area is surrounded by an 8 -inch wood berm, filled with 7 inches of earthen materials. The largest volume of oil in this equipment is 4,491 gallons. These transformers are manufactured for outdoor use and must retain oil to operate properly. It is unlikely that leaks would develop. Possible Spill Occurrence i) Casing rupture The greatest spill potential is from a or leakage: casing rupture or leakage. The maximum volume of oil that could reasonably be expected to spill would be 4,491 gallons. If this occurred it would be detected immediately by a power outage. The oil would be contained in the rock blotter or by the underground oil/water separator located at the south end of the yard. b) Ooerating Pad -Mounted Transformer There is one operating pad -mounted transformer located in the southwest corner of the yard. It is used to furnish electrical power to this facility. This transformer contains 265 gallons of oil. Possible Spill Occurrence: i) Leakage: The greatest spill potential is from leakage of the equipment which would be detected immediately by a power outage. The maximum volume of oil that could reasonably be expected to spill due to leakage is 5 to 10 gallons. 3-15