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• • <br /> UNDERGROUND STORAGE TANK CLOSURE PLAN <br /> FOR <br /> PACIFIC GAS AND ELECTRIC COMPANY'S <br /> STOCKTON SERVICE CENTER <br /> 1. Location: Stockton Service Center, 4040 West Lane, Stockton, <br /> California. Phone # (209 ) 942-1447. <br /> Contact: Mr. Fred Wright <br /> 2. Physical Description: 6/A�- 250 gallon, steel, with associated <br /> piping. <br /> 1 - 10 , 000 gallon , steel , with <br /> associated pumps , sump , and <br /> piping. <br /> v <br /> 3. Contents : None . The 250 gallon4strage tanks contained <br /> waste oil and hydraulic oil. <br /> The 10, 000 gallon storage tank contained transformer oil. <br /> 4. Contractor: SO 5 2✓ erv'\Acj'/1a-J <br /> 5 . Soil Sampling : The soil sampling and testing will be <br /> performed by The Twining Laboratories, Inc. <br /> 6. Methods of Disposal : Before excavation begins, any residual <br /> sludge or free liquid will be removed from the tanks with a <br /> vacuum truck. Clean excavated material will be stockpiled <br /> on-site for use in backfilling the excavation. The tanks and <br /> piping will then be uncovered with a backhoe . The piping <br /> will be removed and stockpiled for off-site disposal. <br /> Flammable vapors will be purged by introducing 1. 5 pounds of <br /> dry ice per 100 gallons of capacity into each tank and <br /> sealing all openings, except the vent port, at least one hour <br /> before tank removal . Following removal , the tanks will be <br /> removed from the site as soon as possible by licensed <br /> hazardous waste hauler and transported directly to a Class I <br /> disposal facility. AQy be G/eane6�1, an SiJ-p v re"Clere'l / h <br /> Any obvious contaminated soils will be excavated and <br /> stockpiled for off-site disposal . Soil samples will then be <br /> taken from the bottom of the excavation and laboratory tested <br /> for oil, grease , and polychlorinated biphenyuls ( PCB ) . At <br /> least one sample will be taken for each 200 square foot of <br /> tank excavation and for each 20 linear foot of piping <br /> excavation. <br />