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Henderson Mine SPCC/MCP May 1999 • curb exists azound the perimeter of the generator room and its containment capacity is greater than the entire contents of the fuel tank in the event of a spill or leak. Oil and grease are stored in five-gallon buckets in the Old Mill Bwlding. Portable tote:> are also used from time-to-time to fuel equipment at the Urad site. These totes aze handled carefully to minimize the possibility of spillage. 6.9 Polychlorinated Biphenyls (PCB's) Polychlorinated biphenyls or PCB's aze in use in electrical equipment, both underground and on the Henderson Mine surface. Inventory use, control, and disposal of PCB's are strictly managed by Henderson Mine's Electrical Department under the auspices of a PCB management plan. Henderson Mine has a slightly more than 6,200 gallons of dielectric fluid in transformers, the majority of which is underground on the 7500 level. Any PCB spills aze handled according to procedures outlined in the Henderson Mine Incident Response Manual and through Henderson's Electrical Department protocols. 6.10 Sodium Hydroxide (Liquid~at Henderson Mine Sodium hydroxide (caustic soda) is no longer used at Henderson Mine; however, during the interim time period before all the residual materials can be disposed, approximately 2,000 gallons of NaOH will be stored at the Flume House and some residual materials in • a 5,500 gallon tank at the No. ] Shafr House. Located within a concrete benned area capable of containing over 8,000 gallons, this 5,500 gallon tank rests on a sloping floor that reports to a collections sump. The tank feeds directly to the settling ponds and provides water treatment capability for these ponds in the event that the Urad pipeline or treatment system is not available. A second water treatment system is located in the No. 1 Pond Flume House wherein a 3,850 gallon NaOH (caustic soda) tank resides. This 3,850 gallon tank location is equipped with a sloped sump for truck unloading. Perry leaks from the tank would enter Henderson's No.l Pond, where the sodium hydroxide would be neutralized. [t should be noted that at the time of preparation of this SPCC plan (April-May 1999), the 3,850 gallon tank was "out-of-service" and scheduled for removal. 6.11 Sodium Hydroxide (Liquids-at Urad's Old Mill Building Sodium hydroxide (caustic soda) is stored in a 10,000 gallon storage tank in the Old Mill Building (Figure 4). This tank has visual indicator and a milltronics level indicator to verify the volume of sodium hydroxide stored. To replenish the sodium hydroxide tank, it is loaded from tankers by means of an enclosed delivery port on the side of the building. Once inside the building in the tank, the sodium hydroxide is immediately diluted to a 50% solution strength by the addition of water. Dilution serves to lower the freezing point of the solution and decrease its viscosity for easier handling. Th~~ sodium hydroxide unloading pipeline and the dilution pipeline each have atank-level a~ntrolled • solenoid valve that will refuse delivery if the storage in the tank exceeds the high level alarm point. Piping and the tank itself are contained within a spill containment sump (capacity = 10,500 gallons) that surrounds the tank. 16