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f 1 <br /> r <br /> 03 September 2004 <br /> AGE-NC Project No 98-0448 <br />' Page 10 of 13 <br /> 4 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br />' transported to CTEL, a DHS-certified laboratory to be analyzed for <br /> • TPH-g by EPA Method 503018015, and <br />' • BTEX, MTBE, 1,2-DCA, EDB, TBA, DIPE, ETBE and TAME by EPA Method 8260B <br /> I4 4 QUARTERLY GROUND WATER MONITORING AND SAMPLING FINDINGS <br />' AGE determined ground water flow direction and gradient from the field data collected on 02 July <br /> 2004, the contaminant impact to ground water was assessed from the laboratory data <br /> I4 4 1 GROUND WATER ELEVATION AND GRADIENT <br /> During the July 2004 ground water monitoring event, the depths to ground water were measured <br /> between 19 71 and 2133 feet below the tops of the well casings(Table 6), ground water elevations <br /> were calculated to be between 10 40 feet (MW-1) and 12 03 feet (MW-4B)below mean sea level <br /> Generally, ground water elevation at the site slightly decreased an average 0 16 feet between the <br /> January 2004 and the July 2004 ground water monitoring events <br /> The July 2004 ground water flow direction at the site was inferred to be southwest,at an approximate <br /> gradient of 0 015 ft/ft (Figure 6) <br /> 4 4 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> IDuring the July 2004 monitoring event, TPH-g was detected in the water samples collected from <br /> wells MW-2 at a concentration of 7,100 micrograms per liter (µg/1), from well MW-4A at a <br /> concentration of 800 ug/l and from MW-4B at a concentration of 500 µg/1 The inferred extent of <br /> dissolved TPH-g during the July 2004 ground water'monitoring event is depicted in plan view on <br /> Figure 7 <br /> IToluene eth lbenzene and total xylenes were detected in the ground water sample collected from <br /> I MW-2 at concentrations of 28 gg/l,440µg/1 and 1,480µg/1,respectively,total xylenes were detected <br /> from wells MW-4A and MW-4B at concentrations of 20 µg/1 and 3 6 µg/l, respectively Benzene <br /> was not detected in the groung water samples analyzed <br /> Advanced GeoEnvironmentai,Inc <br /> I , <br />