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KEI-J88-0810 August 30, 1988 Page 2 Two (2) native soil samples, labeled A and B, were taken beneath the tank at depths of 12 and 10 feet below grade, respectively. The undisturbed samples were collected from bulk material excavated by backhoe. The samples were placed in clean, two-inch diameter brass tubes, sealed with aluminum foil and plastic caps and were stored in a cooled ice chest for delivery to a certified laboratory. During excavation, groundwater was encountered at a depth of approximately 12.5 feet below grade. One water sample, labeled W-1, was collected from the pit. The sample was placed in a clean VOA vial with a Teflon -lined screw cap and was labeled and stored on ice for delivery to the certified laboratory. SUBSURFACE CONDITIONS The subsurface soils exposed primarily of silt and clay. ANALYTICAL RESULTS in the excavation consisted All samples were analyzed by Sequoia Analytical Laboratory of Redwood City, California, and were accompanied by properly executed chain of custody forms. The soil samples were analyzed for total petroleum hydrocarbon (TPH) as gasoline, benzene, toluene, xylene and ethylbenzene (BTXE), ethylene dibromide and organic lead, using EPA methods, 5030, 3810 8015 and 8020. The water sample was analyzed for TPH and BTXE. The analytical results are summarized in Table 1. Copies of the laboratory analyses and the chain of custody forms are attached to this report. DISCUSSION Analytical results of the soil samples indicate non-detectable levels of organic lead and ethylene dibromide. TPH levels were 200 parts per million (ppm) and 240 ppm for samples A and B, respectively. The water sample had 130 parts per billion (ppb) benzene. A copy of this report should be sent to the Tracy Fire Department, the San Joaquin County Department of Health, and to the Regional Water Quality Control Board.