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1 GEOMATFlIX Mr Jay Jahangiri ' Port of Stockton February 5, 2002 Page 3 FIELD AND LABORATORY RESULTS ' The soils encountered during the field investigation consisted of greenish gray to dark greenish gray clay, silt, and sand Soil in the upper 20 to 30 feet bgs in each boring was predominantly clay and silt, while sand was more prominent from 20 to 40 feet bgs The soil ' samples collected from borings 1334 and B3-7, located northeast and northwest of UST Site No 3, respectively, did not have a petroleum odor or PID readings that would suggest organic ' vapors The soil samples collected from borings B3-5 and B3-6, located east-southeast and southwest of UST Site No 3, respectively, exhibited petroleum odor, staining, and elevated PID readings (Figure 2) ' The laboratory analytical results for soil samples are presented in Table 1 Soil samples from the 20-foot depth in borings B3-4 and B3-7 were not analyzed for PHCs because no organic ' vapors were detected during field screening (Figure 2) The analytical results of soil samples collected from 40 feet bgs in borings B34 and B3-7 were non-detect for BTEX and TPH-g Analytical results of soil samples collected from the shallow interval in borings B3-5 and 133-6 ' indicated detectable, but low concentrations of PHCs Analytical results of the soil sample collected from 20 feet bgs in boring 133-5 indicated concentrations of benzene at 0 11 milli- grams per kilogram (mg/kg, or parts per million), toluene at 0 029 mg/kg, ethylbenzene at 0 03 mg/kg, total xylenes at 0 059 mg/kg, and TPH-g at 6 4 mg/kg The soil sample collected from 15 feet bgs in boring B3-6 was non-detect for benzene and had concentrations of toluene at 0 02 mg/kg, ethylbenzene at 0 022 mg/kg, total xylenes at 0 038 mg/kg, and TPH-g at 4 1 mg/kg The analytical results of soil samples collected from 40 feet bgs in borings 133-5 and 133-6 were non-detect for BTEX and TPH-g IThe laboratory analytical results for grab groundwater samples are presented in Table 2 Groundwater samples from all four borings were analyzed for PHCs The analytical results of I the groundwater samples collected from borings B3-4 and 133-7 were non-detect for BTEX and TPH-g (Figure 2) The analytical results of the groundwater sample collected from boring B3-5 at 20 feet bgs indicated concentrations of benzene at 19,000 micrograms per liter (µg/f, or parts per billion), toluene at 21,000 gg/f, ethylbenzene at 12,000 pg/f., total xylenes at 39,000 pg/f, and TPH-g at 610,000 gg/C The groundwater sample from boring B3-5 at 40 feet bgs had concentrations of benzene at 10 µg/l;, toluene at 2 1 leg/f., ethylbenzene at 2 6 gg/f, total xylenes at 8 4 pg/e, and TPH-g at 220 µg/f IThe analytical results of the groundwater sample collected from boring B3-6 at 21 feet bgs • indicated concentrations of benzene at 2,200 gg/f, toluene at 26 µg/f, ethylbenzene at 62 Fg/f, 1\PROJEC n6437 000\6437-Site3 UtVert Results doc