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1 ' <br /> t <br /> H'ALTH <br /> A\� <br /> 9/3 OCT 2613piggne International <br /> CONSULTING GEOLOGISTS <br /> October 1, 1993 <br /> Mr. James Hobli,tzell <br /> Falcon Energy <br /> P.O. Box 1257 <br /> Stockton CA 95201 <br /> Subject: Results of Soil Sampling at City of Stockton, Corp. Yard <br /> During Removal of Tanks 4, 5 and 6 <br /> Dear Mr. hoblitzell; <br /> Three underground storage tanks were removed from the City of <br /> Stockton Corporate Yard on September 8 , 1993 . The tanks were all <br /> 1000 gallon in size and located adjacent to the vehicle maintenance <br /> shop. A description of the sampling activities for each tank is <br /> presented below. <br /> TANK 4 <br /> Tank 4 was a waste oil tank oriented in an east-west direction. The <br /> fill end was on the east side of the tank. The tank was relatively <br /> deep with the bottom at a depth; of approximately 13 to 14 feet. An <br /> inspection of the tank upon removal showed a corrosion hole : inch <br /> in diameter on the center bottom of the tank. Several smaller holes <br /> were also present on the top of the tank. <br /> A soil sample was collected from below each end of the tank. The <br /> samples, labeled T-4 east and T-4 west, were taken in native soil <br /> at a depth of approximately 16 feet. Samples were collected by <br /> driving a brass tube into the soil brought to the surface by the <br /> backhoe from the selected depth. The soil consists of light brown <br /> clayey to fine-sandy silt. No hydrocarbon odor was detected in <br /> either of the samples. <br /> The soil from the excavation. of the tank was placed in three <br /> stockpiles. Each stockpile was sampled at a random location by <br /> excavating approximately three to four feet into the pile with the <br /> backhoe and driving a brass tube into the soil of the excavated. <br /> area. The soil in the stockpiles consisted of a mixture of coarse <br /> sand (fill) and native silt. <br /> The soil samples from below Tank 4 and the adjacent stockpiles were <br /> sealed with teflon, capped, labeled and placed in a cooled ice <br /> chest. The following analysis was requested for each sample: 1) TPH <br /> gasoline with BTEX; 2) TPH diesel; 3) EPA 8010 or 8240; 4) PCB by <br /> EPA 8080; and 5) ICAP metals (Cd, Cr, Pb, Ni and Zn) . <br /> 38750 PASEO PADRE PARKWAY, SUITE 8-4 - FREMONT. CALIFORNIA 94536 - 15101 791-1986 <br />