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June 25, 1992 <br /> ARCO Service Station No. 2076, Lodi, California <br /> r <br /> Anal ical Results of Samples From P duct-Une Trenches <br /> Results of analyses of soil samples collected under the former product lines and vent-return <br /> lines from 1 to 3 feet below grade indicated TPHg was detected at concentrations ranging <br /> from 29 ppm to 28,000 ppm (Table 3) A concentration of 28,000 ppm TPHg was detected <br /> near the northern dispenser in the southeast corner Hydrocarbons were not detected in soil <br /> 1 sample S-4-PLS collected at 4 feet below grade at the western end of the northern dispenser <br /> The total concentration of lead detected in soil sample S-3-PL1 was 52 ppm This was the <br /> highest concentration of lead detected in soil samples analyzed from the tank cavity and the <br /> product lines, therefore the sample was analyzed for soluble lead The soluble lead results <br /> I <br /> detected 2.0 ppm of soluble lead. Copies of laboratory results are in Appendix C <br /> Analytical Results of Samples From New Tank Cavity <br /> Hydrocarbons were not detected in the soil samples collected from the base and sidewall <br /> of the new tank cavity Results are shown on Table 4 Copies of laboratory analyses are <br /> in Appendix D <br /> Anal ical Results of Sam les From Stockpiled Soil <br /> Hydrocarbons were not detected in the composite soil samples collected from the excavated <br /> soil from the new tank cavity except 0 027 ppm of total xylene isomers detected in soil pile <br /> 6 (Table 5) Gasoline hydrocarbons (quantified as TPHg) were detected in the composite <br /> soil samples collected from the excavated soil from the former tank cavity at concentrations <br /> ranging from 35 to 8,500 ppm (Table 6) Concentrations of TPHg in the samples collected <br /> from soil excavated from the former product- and vapor-return trenches ranged from 320 <br /> to 1,500 ppm (Table 7) Copies of laboratory results are in Appendix E <br /> 30008-3 6 <br />