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i <br /> %WWI r� <br /> KAPREALIAN ENGINEERING, INC. <br /> Consulting Engineers <br /> P.O. BOX 996 • BENICIA. CA 94510 <br /> (707) 746-6915 + (707) 746-6916 • FAX: (707) 746-5581 <br /> KEI-J89-1104 .R5 <br /> January 22, 1990 <br /> Unocal Corporation <br /> 2175 N. California Blvd. , Suite #650 <br /> Walnut Creek, CA 94596 <br /> Attention: Mr. Ron Bock <br /> RE: Stockpiled Soil Sampling for <br /> Unocal Service Station #5421 <br /> 7303 Pacific Avenue <br /> Stockton, California <br /> Dear Mr. Bock: <br /> This letter report summarizes the results of the stockpiled soil <br /> sampling and laboratory analyses for the referenced site. The <br /> soil analyses were conducted to comply with the County Health <br /> Department requirements for proper disposal of contaminated soil. <br /> On January 16, 1990, soil samples from approximately 350 cubic <br /> yards of stockpiled soil at the referenced site were collected to <br /> determine proper disposal of the soil . Seven composite soil <br /> samples (designated as Comp 18, Comp 19, Comp 20, Comp 21, Comp <br /> 22, Comp and Comp 24) were taken. Each composite sample con- <br /> sisted of four individual grab samples taken at various locations <br /> and depths ranging from one to two feet. The samples were <br /> collected in two-inch diameter, clean brass tubes, which were <br /> then sealed with aluminum foil, plastic caps and tape, and placed <br /> in a cooled ice chest for subsequent delivery to a certified <br /> laboratory for analysis. All samples were analyzed at Sequoia <br /> Analytical Laboratory in Redwood City, California, and were <br /> accompanied by properly executed Chain of Custody documentation. <br /> Sample locations are as shown on the attached Site Plan. <br /> The composite samples were analyzed to determine concentrations <br /> of total petroleum hydrocarbons (TPH) as gasoline using EPA <br /> method 5030 in conjunction with modified 8015; benzene, toluene, <br /> xylenes and ethylbenzene (BTX&E) using EPA method 8020. The <br /> results of the soil analyses showed concentrations of TPH as <br /> gasoline ranging from non-detectable to 24 ppm. Analytical <br /> results are summarized in Table 1. Copies of the laboratory <br /> analyses, and the Chain of Custody documentation are attached to <br /> this report. <br />