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S r r F KAPREALIAN ENGINEERING, INC. K E I Consulting Engineers P.O. BOX 996 • BENfICIA, CA 94510 (707) 746-6915 • (707) 746-6916 • FAX: (707) 746-5581 KEI-J89-1104 .R2 January 9, 1990 Unocal Corporation 2175 N. California Blvd. , #650 Walnut Creek CA 94596 L%0.L-3 w { Attention: Mr. Ron Bock JAN 2 5 11990 RE: stockpiled Soil sampling for ENVIRONMENTAL HEALTH Unocal Service Station #5421 PERMIT/SERVICES 7303 Pacific Avenue Stockton, California____ Dear Mr. Bock: This letter report summarizes the results of the stockpiled soil sampling and laboratory analyses for the referenced site. The soil analyses were conducted to comply with the County Health Department requirements for proper disposal of contaminated soil . On December 18 , 1989, soil samples from approximately 450 cubic yards of stockpiled soil at the referenced site were collected to determine proper disposal of the soil . Nine composite soil samples (designated as Camp 1, Comp 2, Comp 3 , Comp 4 , Comp 5, Comp 6, Comp 7, Comp 8, and Comp 9) were taken. Each composite sample consisted of four individual grab samples taken at various locations and depths ranging from one to two feet. The samples were collected in 2" diameter, clean brass tubes, which were then sealed with aluminum foil, plastic caps and tape, and placed in a cooled ice chest for subsequent delivery to a certified labora- tory for analysis. All samples were analyzed at Sequoia Analyti- cal in Redwood City, California, and were accompanied by properly executed Chain of Custody documentation. Sample locations are as shown on the attached Site Plan, Figure 1. The composite samples were analyzed to determine concentrations of total petroleum hydrocarbons (TPH) as gasoline using EPA method 5030 in conjunction with modified 8015; benzene, toluene, xylenes and ethylbenzene (BTX&E) using EPA method 8020. The results of the soil analyses showed concentrations of TPH as gasoline ranging from non-detectable to 97 ppm.