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I <br />' 19 December 2005 <br /> • AGE-NC Project No 95-0141 <br />' Page 3 of 5 <br />' 3.0. FINDINGS <br /> Ground water elevation, flow direction, and gradient were determined from field data collected on <br />' 04 August 2005 The contaminant impact to ground water was assessed from the laboratory <br /> analytical data received on 08 August 2005 <br />' 3 1 GROUND WATER ELEVATION AND GRADIENT <br />' At the time of the August 2005 monitoring event, depths to ground water ranged from 19 27 feet to <br /> 20 59 feet below the tops of the well casings Ground water elevations at the site ranged from <br /> 9 51 feet below mean sea level (MSL) in well MW-i2A to 10 33 feet below MSL in well MW-813 <br />' (Table 1) <br /> Wells MW-5, MW-7, MW-8A through MW-12A and EX-1 were used to determine ground water <br /> flow direction and gradient for shallow ground water The shallow ground water was inferred to flow <br /> generally toward the east, under gradients ranging from 0 002 foot per foot (ft/ft) to 0 005 ft/ft <br /> Figure 3 illustrates the contoured shallow ground water elevations as measured on 04 August 2005 <br />' Wells MW-6 and MW-813 through MW-12B were used to determine ground water flow direction <br /> and gradient for the deep ground water zone The deep ground water was inferred to flow generally <br /> Itowards the southeast, at a gradient of 0 005 ft/ft Figure 4 illustrates the contoured deep ground <br /> water elevations as measured on 4 August 2005 <br /> 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br />' The analytical results of the ground water samples were as follows <br /> • TPH-g was detected in ground water samples collected from wells MW-3, MW-5, MW-6, <br />' MW-8B,MW-11 B and EX-1 at concentrations ranging from 320 micrograms per liter(µg/1) <br /> in MW-6 to 170,000 µg/1 in EX-1 <br />' 0 Various BTEX compounds were detected in samples MW-3, MW-5, MW-6, MW-7, <br /> MW-8A, MW-8B, MW-9A, MW-913, MW-1113, and EX-1 at concentrations as high <br /> as15,000µg/1 ofbenzene,62,000 µg/l of toluene,9,700µg/1 of ethylbenzene and 58,000µg/1 <br /> of xylenes from well EX-1 <br /> • 1,2-DCA was detected in ground water samples collected from seven out of the sixteen wells <br />' tested MW-3, MW-5, MW-7, MW-8A/B, MW-1113, and EX-1 showed concentrations of <br /> 1,2-DCA ranging from 6 9 µg11 (MW-3) to 230 µg11 (EX-1) <br /> IAdvanced GeoEnvironmeotai,Inc <br />