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+ r' <br /> * %000 <br /> KAPREALIAN ENGINEERING, INC. <br /> K E, Consulting Engineers <br /> N N 1 1 /!Z� P.O. BOX 996 • BENICIA, CA 94510 <br /> (707) 746-6915 • (707) 746-6916 • FAX: (707) 746-5581 <br /> KEI-J89-1104 .R4 <br /> January 18, 1990 <br /> Unocal Corporation <br /> 2175 N. California Blvd. , #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 8, 1990, soil samples from approximately 150 cubic <br /> yards of stockpiled soil at the referenced site were collected to <br /> determine proper disposal of the soil. Three composite soil <br /> samples (designated as Camp 15, Comp 16 and Camp 17) were taken. <br /> Each composite sample consisted of four individual grab samples <br /> taken at various locations and depths ranging from one to two <br /> feet. The samples were collected in 2" diameter, clean brass <br /> tubes, which were then sealed with aluminum foil, plastic caps <br /> and tape, and placed in a cooled ice chest for subsequent <br /> delivery to a certified laboratory for analysis. All samples <br /> were analyzed at sequoia Analytical in Redwood City, California, <br /> and were accompanied by properly executed Chain of Custody <br /> documentation. Sample locations are as shown on the attached <br /> 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 non-detectable concentrations <br /> of TPH as gasoline and BTX&E in all samples. Analytical results <br /> are summarized in Table 1. Copies of the laboratory analyses, <br /> and the Chain of Custody documentation are attached to this <br /> report, <br />