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I03 October 2000 AGE-NC Project No 97-0326 IPage 3 of 5 IClassification System (see Boring Logs, Appendix A) 4.0. FINDINGS The soil description data was integrated with previous subsurface results to refine the subsurface I geological model, the hydrocarbon impact to soil and ground water were addressed by laboratory analysis of selected samples, as presented below I41 STRATIGRAPHY In boring B5 the soil stratigraphy can be categorized into three zones Between the depths of 20 to 25 feet the soil is composed of sandy silt From 35 to 65 feet the soil is a dark gray to gray brown silty clay Below 65 feet the soil exhibits a different color (dark green-gray to dark green) and appears to coarsen downwards, from silty clay to silt with fine sand lease to sandy silt In boring B6 the soil stratigraphy, from the starting depth of 45 feet to 55 feet is silt, fining to a silty clay interval at 60 feet, and coarsening from silt with trace of sand at 65 feet to sandy silt at 70 feet Boring Iogs ' . are included in Appendix A Organic vapor was detected in B5 soil samples at concentrations as high as 210 parts per million (ppm), organic vapor was also detected in B6 soil samples at concentrations as high as 39 ppm(see Appendix A) 42 ANALYTICAL RESULTS OF SOIL SAMPLES TPH-g was detected in samples B5-45 and B5-50* at concentrations of 7 8 milligrams per kilogram I (µg/kg)and 340 µglkg,respectively Ethylbenzene and xylenes were detected in samples B5-50* at concentrations as high as 9 3 µg/kg Benzene and MTBE were not detected in any of the samples analyzed Petroleum hydrocarbons were not detected in samples analyzed from boring B6 Analytical results of soil samples are summarized on Table 1 The laboratory report (AAL Batch Nos MJS13/1984 and CWH27086) and chain-of=custody form are included in Appendix B 43 ANALYTICAL RESULTS OF GRAB GROUND WATER SAMPLES TPH-g was detected in samples B5-70/4-10-00 and B6-70/4-10-00 at concentrations of 550 micrograms per liter(}Lg/l)and 560 µg/1,respectively BTEX were detected in the B-5 and B-6 grab ground water samples at concentrations as high as 22 µg/1 and 160 �Lg/1 respectively MTBE was Idetected in the B-6 grab ground water sample at 6 0 µg/1 Analytical results of water samples are • summarized on Table 2 I Advanced GeoEnrnranmental,Inc.