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I <br /> 15 August 2005 <br /> AGE-NC Project No 97-0326 <br />' Page 3 of 5 <br /> I3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> At the time of the June 2005 sampling event,depths to ground water ranged from 32 88 feet to 36 09 <br />' feet below the tops of the well casings <br /> The elevation of ground water in each well was calculated by subtracting the depth to ground water <br />' from the casing elevations Ground water elevations ranged from 18 08 feet(MW-9B)to 20 94 feet <br /> (MW-8D) below mean sea level (MSL) <br />' First-encountered ground water was within the screen interval of wells MW-2 through MW-3, <br /> MW-7, MW-8A and MW-9A, these wells should yield samples representative of shallow ground <br /> water conditions (Table 1), ground water from deep-screened wells MW-8[B-D] and MW-9[B-D] <br />' should yield samples representative of deeper ground water conditions First-encountered ground <br /> water was slightly above the screen interval (35 feet to 45 feet) of well MW-1, ground water was <br /> encountered at 34 23 feet bsg <br />' A ground water elevation map of first-encountered ground water Is presented in Figure 3 <br /> • First-encountered ground water was inferred to be flowing toward the south-southeast with a <br /> hydraulic gradient of 0 005 foot/foot(ft/ft) The flow direction is generally consistent with previous <br /> monitoring events <br /> 1 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Twelve ground water samples were collected and submitted for laboratory analysis for the <br /> constituents listed in Section 2 2 (Table 2) The analytical results for each hydrogeologic unit is <br />' characterized below <br /> HU 1 - TPH-g was detected in ground water samples collected in HU 1 from wells MW-1, MW-2, <br />' MW-3, MW-8A, and MW-9A at concentrations ranging from 8,800 micrograms per liter ([ig/1) in <br /> sample MW-9A to 100,000 41 in sample MW-3 (Figure 4) <br />' BTEX compounds were detected in ground water samples collected in HU1 from wells MW-1, <br /> MW-2, MW-3, MW-8A, and MW-9A at concentrations ranging of 8,500 µg/1 benzene (MW-3), <br /> 15,000 pg/1 toluene (MW-3 and 9A), 6,000 µg/1 ethylbenzene (MW-3), and 30,000 µg/1 xylenes <br />' (MW-3) <br /> The fuel additive MTBE was detected in ground water samples collected from HU 1 from wells MW- <br /> 1, MW-2, MW-3, MW-8A, and MW-9A at concentrations ranging from 18 µg/1 (MW-2)to 1,300 <br /> µg/l (MW-9A) (Figure 5) 1,2-DCA was detected in samples MW-1,MW-2, MW-3, MW-8A, and <br /> 1 Advanced GeoEnvironmental,Inc <br />