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• 17 October 2003 <br /> I AGE-NC Project No 02-0964 <br /> Page 5 of 8 <br />' Hydrologic Units la, 2, 4, 6 and 8 (HU1a, HU2, HU4, HU6 and HU8) are sand-bearing units <br /> characterized by low CPT pore pressures(Appendix B) HU1 a,HU2 and HU9 are dominantly sand <br /> I units, HU4 and HU6 are composed of inter-bedded layers of sand and sandy silt Hydraulic <br /> conductivities,based on CPT soil behavior types(SBT)should range between 1 X10 6 to 1 meters per <br /> second(m/s) for sandy silt to gravelly sand, measured hydraulic conductivities,based on CPT pore <br /> pressure dissipation tests, were between 1 x 10-5 to 1 x 10 a m/s <br /> Hydrologic Units 1, 3, 5, 7 and 9 (HU1, HU3, HU5, HU7 and HU9) are fine-grained intervals <br /> composed of clay, silty clay, clayey silt, silt, and stiff, fine grained soil These intervals are <br /> characterized by low to moderately low pore pressure in the clay and silt, generally moderate <br /> pressures for the clayey silt to silty clay, and variable pore pressure, from moderately low to high, <br /> in the stiff, fine-grained soil Hydraulic conductivities based on SBT should range between 1 X 1010 <br /> to 1 x 10"' m/s for clay to silt, and between 1 x 10-9 to 1 x 10-' m/s for stiff, fine-grained soil <br /> (Appendix B) Hydrogeologic units are depicted in cross sectional view A-A' and B-B' (Figures 3) <br /> I <br /> 33 LABORATORY RESULTS OF GRAB GROUND WATER AND SOIL SAMPLES <br /> A total of seventeen 'grab' ground water samples and two soil samples were collected from on- and <br /> off-site and submitted for laboratory analysis for the constituents listed in Section 2 2 <br /> I3 3 1 Soil Samples Analytical Results <br /> The concentrations of TPH-g,TPH-d and benzene were non-detect in the soil sample collected.from <br /> CPT1 at 55 feet bsg (HU1), however, ethylbenzene and xylene and were detected at maximum <br /> concentrations of 0 025 milligrams per kilogram (mg/kg) <br /> TPH-g was detect in soil sample collected from CPT1 at 78 feet bsg (HU2/3) at a concentration of <br /> 4,800 mg/kg, in addition, toluene, ethylbenzene and xylene a614 were detected at maximum <br /> concentrations of 350 mg/kg TPH-d and benzene were not detected in the sample from 78 feet bsg <br /> Hydrocarbons (TPH) in sail is depicted in cross sectional view A-A' and B-B' (Figures 4) <br /> 3 3 2 Grab Ground Water Analytical Results <br /> HU1 One sample (CPT5-60) was collected from off-site CPT5, target analytes were not: detected <br /> in this sample <br /> Advanced GeoEnvironmental,Inc <br />