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12 January 2005 <br /> • AGE-NC Project No 97-0326 <br />' Page 8ofII <br /> HU2 Only low concentrations of BTEX compounds were detected in soil samples collected from <br /> bonngs MW-8 and MW-9,the maximum concentrations were detected in sample MW9-80 at 0 054 <br /> mg/kg benzene, 0 011 mg/kg ethylbenzene and 0 066 mg/kg xylenes <br /> HU3 Petroleum hydrocarbon compounds were not detected in HU3 <br /> HU4 Only low concentrations of BTEX compounds were detected in soil samples collected from <br /> boring MW-9, the maximum concentrations were detected in sample MW9-110 at 0 028 mg/kg <br /> benzene, 0 015 mg/kg toluene, 0 016 mg/kg ethylbenzene and 0 074 mg/kg xylenes <br />' HU5 Only xylenes was detected in sample MW9-125 at a concentration of 0 015 mg/kg <br /> HU6 Only xylenes was detected in in sample MW9-140 at a concentration of 0 011 mg/kg <br /> 14U7 Petroleum hydrocarbon compounds were not analyzed in HU7 <br />' No additional analytes were detected at or above the laboratory reporting limits in the samples <br /> analyzed The laboratory reports (CTEL Project Nos 214-0403122, -0403171 and -0403172) and <br />' chain-of-custody forms are presented in Appendix G Analytical results of the soil samples are <br /> summarized in Table 1 and shown in cross-section in Figure 5 <br /> 1 <br /> 3 4 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the April 2004 sampling event, depths to ground water ranged from 34 42 feet to <br /> 36 88 feet below the tops of the well casings The depth to ground water(35 50 feet) at well MW-I <br />' was affected by the presence of approximately an inch of free product,so the depth was recalculated <br /> (35 44 feet) utilizing the measured thickness of free product in well MW-1 <br />' Dw=D. - 09 * d�dw) <br /> Du,= Corrected depth to water <br />' Dn, = Measured depth to water <br /> tb=Total thickness of free product (-0 21 foot) <br /> dg=Density of free product (gasoline at —0 75 g/ml) <br /> d,,,= Density of water(-1 0 gm/ml) <br /> During this monitoring event, the water level was within the screened intervals of all the wells, <br />' indicating that the wells are screened properly to yield representative shallow ground water samples <br />' Advanced GeoEnvironmental,Inc <br />