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Precision Industries, Inc obtained one soil sample from each UST excavation The sample from the 550-gallon UST excavation was obtained-from a depth of approximately 10 feet below ground surface (bgs) The sample from the 1,000-gallon UST excavation was obtained from approximately 12 feet bgs Analytical results for the sample from the 1,000-gallon UST indicated concentrations of 1,200 mg/Kg (ppm) Total Volatile Petroleum Hydrocarbons, 430 mg/Kg Benzene, 69 mg/Kg Toluene and 6 0 mg/Kg Total Lead The sample from beneath the 550-gallon UST had a concentration of 9 0 mg/Kg Total Lead Other analytes were not detected In March 1997, WHF, Inc advanced one soil boring to 80 feet bgs in the vicinity of the former USTs Soil samples and a groundwater sample from the boring, along with a water sample from the domestic well, were submitted for laboratory analysis of Total Petroleum Hydrocarbons as gasoline (TPHg), Benzene, Toluene, Ethyl Benzene and Total Xylene isomers (BTEX), and Methyl Tertiary-Butyl Ether(MTBE) Analytical results for the soil samples revealed TPHg concentrations of 5 7-1,400 mg/Kg, Benzene concentrations of 0 95-23 mg/Kg, Toluene concentrations of 40-200 mg/Kg, Ethyl Benzene concentrations of 9 2-53 mg/Kg, and total Xylene concentrations of 80-410 mg/Kg MTBE was no detected in the samples rAnalytical results for the groundwater sample showed 53,000 Icg/L (ppb) TPHg, 21,000 yg/L Benzene, 21,000 ug/L Toluene, 1,700 ug/L Ethyl Benzene, and 12 0,000 ,ug/L total Xylenes None of the analytes were detected in the domestic well water sample BSK conducted the investigation described herein during December 1998 through February 1999 2.3 Hydrogeologic Conditions ' The subject site, located in the northeastern portion of the San Joaquin Valley, is underlain by Quaternary alluvial sediments of non-marine origins Soils encountered to depths of 100 feet bgs generally comprise interbedded silty sand and sandy silt The Site is located near the southern end of the Eastern San Joaquin County Groundwater Basin According to a Spring 1997 groundwater elevation map prepared by the San Joaquin County Flood Control and Water Conservation District, groundwater in the area generally flows to the ' northwest In the immediate vicinity of the Site, groundwater was encountered at approximately 80 feet bgs during the winter of 1998/1999 Interim Report-07400178-May 1999 2