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kaws, <br /> rs <br /> %R KLEINFELDER <br /> 4 CONCLUSIONS <br /> Results of the preliminary soil assessment investigation of the Nomellini Construction <br /> atiiiry indicate hydrocarbon contamination is present in the soil and may have migrated <br /> WM vertically to the ground water surface. <br /> Samples collected from each boring were qualitatively scree ed in 5 feet.the field. <br /> PID readings <br /> boring, relatively low PID readings were detected from 5 w 1 <br /> increased at a depth of 20 feet and were highest in the bottom sample from each boring <br /> (with the exception of B-2 which had the highest reading at a depth of 20 feet). <br /> There was a reasonable correlation between the qualitative PIr readings and the ; <br /> In general, the samples with high PID readings had <br /> quantitative analytical results. <br /> detectable petroleum hydrocarbon concentrations. There were a few irregularities in some: <br /> of the PID and analytical results. Sample 22984 (B-120.5)had a PID reading of 75 ppmv <br /> _ and high TPH and BTEX concentrations. Samples 22999 (B-42 0.51 a TPH and BTEX <br /> had high PID readings (250 and 210 ppmv <br /> respectively) <br /> concentrations were detected. <br /> Boring B-1 was advanced to 26.0 feet and Borings B-2 through B-9 were advanced to a <br /> ground depth of 22.5 feet to collect samples just above the ground water surface. Of the 15 e <br /> samples an«lyzed,high TPH and BTEX concentrations were detected just above and below <br /> the ground water surface in Boring B-1,and just above the ground water surface in:^oring <br /> 13.2. The remaining samples had relatively low concentrations detected. Samples were <br /> analyzed frog.depths of 10.5 feet to 26 feet. The purpose of this investigation was to assess <br /> the lateral and vertical extent of contamination in the unsaturated soil in the vicinity of the <br /> previous excavations. In all nine borings, high PID readings and in most cases, odor was ,E <br /> detected at the bottom of the boring. fi <br /> y <br /> petroleum hydrocarbons may have migrated vertically from the underground fuel storage <br /> tanks to the ground water surface. There appears to have been a lateral component of <br /> contaminant migration at the general depth that ground water was encountf:red in 22 to 23 <br /> Petroleum hydrocarbons drocarbons may be migrating laterally along the surface of the ground <br /> feetS <br /> —✓' waver and its the capillary zone just above the water surface. Potential contalninat.'zn in the <br /> i� <br /> 6 <br /> 188-89-960 <br /> t <br /> ! z <br /> r <br />