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- E <br /> GRANITE CONSTRUCTION, FRENCH CAMP # <br /> WKA No 2088 03 <br /> April 29, 1993 <br /> Page 6 <br /> Analysis of samples obtained from the remainder of the borings in this area revealed TPH- ` <br /> j gasoline concentrations ranging from non-detectable to 6 0 mg/kg Additional analysis of the <br /> samples obtained from borings B7 through B17 revealed total lead concentrations ranging from <br /> IC 10 mg/kg to 7 8 mg/kg - <br /> Three monitoring wells were constructed in the area of the former tank farm to depths ranging <br /> from 39 to 40 feet below surface grade at the locations shown on Plate 3 Construction details <br /> and soil logs for the three monitoring wells are presented on Plates 21 through 23 Moderate <br /> petroleum hydrocarbon odors were reported in the soils obtained,during construction of each <br /> well <br /> Analysis of the soil samples obtained during the construction of the three monitoring wells <br /> revealed trace concentrations of TPH-gasoline and benzene in each monitoring well boring <br /> Additionally, TPH-diesel concentrations of 12 mg/kg were revealed in laboratory analyses of <br /> soils obtained from boring MW-3 Analysis of the soil samples obtained from borings MW-1 <br /> through MW-3 revealed total lead concentrations ranging from 2 3 mg/kg to 6 6 mg/kg <br /> Laboratory analysis sis of the ground water sample obtained from monitoring well MW-3 revealed a <br /> TPH-gasoline concentration of-1100 McgIf Analysis of the ground water obtained from <br /> monitoring well MW-1 revealed a TPH-motor oil concentration of 67 µg/f No detectable <br /> concentrations of TPH were revealed in laboratory analysis of ground water sample MW-2 and <br /> no detectable concentrations of BTEX were revealed in any of the ground water samples Table <br /> 2 presents a summary of ground water test results <br /> Measurements of the depth to ground water obtained prior to sampling each of the monitoring <br /> wells are included in Table 3 Subsequent to surveying, the ground water flow direction beneath <br /> the site was calculated from these measurements to be to the northeast <br /> 6 <br /> `aA <br /> WALLACE-KUHL <br /> Recydedpaper &ASSOCIATES INC <br />