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i(LFINFELDER 2 BACKGROUND This report presents the results of a soil and ground water assessment at the former ' location of three underground storage tanks. The site is a warehouse facility at 1800 Fremont Street in Stockton, California (Plate 1). The investigation was performed by iKleinfelder for Nor-Cal Beverage Company (Nor-Cal) of Sacramento. At the time of the investigation, the warehouse was in use by an automotive brake parts wholesaler. At the request of Nor-Cal, the assessment was limited to the analysis of soil samples from two borings drilled at locations designated by Nor-Cal and the analysis of a ground water sample from an existing monitoring well. A work plan prepared by Kleinfelder, dated December 31, 1991, was submitted to and approved by San Joaquin County Public Health Services, Environmental Health Division prior to the commencement of the investigation. A copy of the approved permit is included in Appendix A. ' Soil and ground water sampling activities were conducted at the site prior to Kleinfelder's soil and ground water assessment. The three underground tanks (1,000 gallon leaded gas, 500 gallon leaded gas, and 10,000 gallon unleaded gas) were excavated and removed from the site on January 3, 1991. Analytical results indicated that soil beneath the tank was ' contaminated with petroleum hydrocarbons (total petroleum hydrocarbons as gasoline ranged from 160 to 30,000 mg/kg at depths of 9.5 to 14 feet) and approximately 70 cubic yards of soil were excavated from beneath the tanks. The tank and soil removal was ' conducted by Placer Tractor Service. ' On March 13, 1991, Placer Tractor excavated additional soil to a maximum depth of approximately 25 feet. Fourteen soil samples were collected from the sidewalls and bottom ' of the excavation at depths ranging from 10 to 24.5 feet. The soil samples were analyzed for total petroleum hydrocarbons (TPH) as diesel, TPH as gasoline, and benzene, toluene, ethylbenzene, and xylenes (BTEX). In 10 of the 14 samples, TPH concentrations were not detected above laboratory reporting limits or were detected below 10 mg/kg. FR1-92-15 Page 3 of 21 Copyright 1992 Mcinfelder, Inc.