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GROUND ZIItO ANALYSIS, INC. o <br /> 3422 W. Hammer Lane, Suite C-294 APR 1 1995 <br /> Stockton, California 95219 <br /> Telephone: (209) 952-3481 ENVIRONMENTAL HEALTH <br /> Facsimile: (209) 952-9891 PERM IT/SERVICr` <br /> April 14, 1995 <br /> Ms. Linda Turkatte <br /> San Joaquin County Public Health Services, <br /> Environmental Health Division <br /> PO Box 388 <br /> Stockton, CA 95201-0388 <br /> Subject: Groundwater Investigation Report, Woolsey Oil Co., 166 bank West Circle, <br /> Stockton, CA <br /> Dear Ms. Turkatte: <br /> Ground Zero Analysis, Inc. (Ground Zero) has prepared this letter report to present the results of the <br /> site characterization/groundwater investigation performed at the subject site in accordance with our <br /> workplan dated February 3, 1995. The purpose of this investigation was to determine if possible minor <br /> residual soil contamination had impacted groundwater at the site. <br /> BACKGROUND <br /> In November 1989, Wallace Kuhl & Associates of West Sacramento, California observed the removal <br /> of two 2,000-gallon regular leaded and supreme unleaded gasoline USTs, four 4,000-gallon and two <br /> 8,000-gallon lube oil USTs, one 8,000-gallon kerosene UST, two 500-gallon used-oil USTs, and <br /> associated piping. Total petroleum hydrocarbons quantified by the analytical laboratory as diesel, <br /> kerosene, and motor oil and BTEX were detected in composite soil samples collected from the former <br /> used-oil UST backfill material stockpiled onsite. Total petroleum hydrocarbons as diesel and motor oil <br /> and BTEX were not detected in soil samples collected in native soil at a depth of approximately 12 feet. <br /> The soil samples were not analyzed for total petroleum hydrocarbons as kerosene. The lower limit of <br /> the former used-oil tank cavity was at a depth of approximately 10 feet. <br /> Total petroleum hydrocarbons and BTEX were detected in soil samples collected from native soil <br /> beneath one of the former lube oil and kerosene USTs located near the eastern property boundary and <br /> from beneath two of the lube oil USTs located adjacent to the southern wall of the warehouse. Soil <br /> beneath the former tanks was overexcavated and additional samples were collected from soil beneath <br /> the lower limit of the overexcavation. The confirmatory samples collected from below the former lube <br /> oil UST located near the eastern property boundary indicated low concentrations of benzene, toluene, <br /> and total xylenes remaining in the soil, however TPH was not detected. TPH and BTEX were not <br /> detected in confirmatory samples collected from beneath the former kerosene UST, and the two former <br /> lube-oil USTs located adjacent to the warehouse. <br />