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3 . 0 TANK CLOSURE PROCEDURE Before tank removal began, a sample was taken of the ,tank contents. This sample was collected on November 27 , 1985, and analyzed for diesel on December 9 , and for PCB' s on December 17 , 1985. On December 10 , 1985 , approximately 250 gallons of diesel fuel were pumped from the tank, using a vacuum truck, by Universal Engineering, Inc. of Concord, California. The tank was rinsed and hydroblasted with 8 , 000 psi water. This water was removed in the same manner as the diesel . This process resulted in 250 gallons of diesel and 700 gallons of rinse water to be disposed of. The diesel and water were manifested and transported to H&H Ship Services in San Francisco, California, as indicated by the manifest found in Appendix A. The tank was excavated and removed on December 12 , 1985 . Visual inspection of the tank indicated good tank integrity. The tank was transported to C&C Metals of Rancho Cordova, to be used for scrap metal. The bottom of the hole was dry and above groundwater indicating that the static water levas below the bottom of the tank. The excavated hole was7t�feet below grade. Excavation and removal was conducted on a foggy day. Visual 1� and olfactive inspection of the soil beneath the tank indicated that some contamination of the soil had occurred. Soil samples were taken from the excavation using a backhoe under the direction of the San Joaquin Local Health District' s inspector, Laurie Cotulla, who was present at the site. A Shelby sampler was used to collect samples from the bucket of the backhoe. Three soil samples were collected, one from the north end and two from the south end of the excavation. The samples were stored in plastic tubes, refrigerated and taken to Canonie Engineers, Inc. in Stockton, California, to be analyzed for diesel . On December 13 , 1985, six additional samples were taken, placed in 40 ml vials, refrigerated and taken to Canonie Engineers, Inc. to be analyzed for benzene, toluene, and xylene. Two of these samples were duplicates, leaving four samples to be analyzed. on December 16, 1985, Laurie Cotulla requested that analysis for PCB' s be performed on the fuel sample and the original three soil samples. Contaminated soil excavation occurred twice. On January 21, 1985 , OHM removed approximately 35 cubic yards of contaminated soil and on March 3 , 1986, another 50 cubic yards of contaminated soil as emoved. The contaminated soil was transported and dis sed of as a hazardous waste solid by Chemical Waste Manag meat, Inc. at their Kettleman Hills Class I landfill . The zardous waste manifests are included in Appendix A. weo&e.