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' 11 December 2001 • AGE-NC Project No 95-0184 ' Page 3 of 5 ' approximately 23 feet above the screened Interval Ground water elevations at the site ranged from -18 39 feet in MW-7 to -18 87 feet in VW-5C relative to mean sea level ' The ground water appears to flow generally northeast across much of the site at a gradient of approximately 0 005 ft/ft (Figure 2), however, an apparent northeast finger in the northern quarter of the site separated the flow pattern Into a northwesterly flow direction(gradient from 0 027 to 0 05 ft/ft) and a southeasterly flow direction (gradient of about 0 012 ft/ft) ' 32 ANALYTICAL RESULTS OF WATER SAMPLES ' TPH-g was detected in all of the sampled momtonng wells at concentrations ranging from 100 micrograms per liter (µg/1) in MW-7 to 180,000 µg/l In VW-2B TPH-d was detected in the sample from MW-4 at a concentration of 3,700 µg/1 ' Except for MW-7, BTEX compounds were detected in all the ground water samples analyzed benzene concentrations ranged from 33 µg/1 (MW-1) to 34,000 µg/1 (VW-2B), toluene '• concentrations ranged from 1 2 µg/l (MW-1)to 35,000 µg/l(VW-5B), ettlylbenzene concentrations ranged from 3 2 µg/1 (MW-1) to 4,300 µg/1 (VW-5B), and xylenes concentrations ranged from 2 1 µg/l (MW-1) to 22,000 µg/1 (VW-5B) The oxygenated volatile organic compound MTBE was detected b EPA Method 8250 in five of the yg g P y samples, at concentrations ranging from 1 2 µg/l (MW-3) to 260 µg/1 (VW-4), none of the other oxygenated volatile organics were detected at concentrations above laboratory reporting limits No additional petroleum hydrocarbon compounds were analyzed tAnalysis of the equipment blank detected TPH-g at 15,000 µg/1 and BTEX compounds at concentrations of 1,800µg/l(benzene),2,000µg/1(toluene),280µg/1(ethyl benzene)and 1,300µg/l ' (xylenes), oxygenated volatile organic compounds were not detected In the equipment blank Analytical results of ground water samples are summarized on Tables 2 and 3 Copies of the ' laboratory report(MAI Laboratory 1D76888-76898)and chain-of-custody forms are in Appendix B ' 4.0. SUMMARY AND CONCLUSIONS Based upon data collected from the site, AGE concludes the following IGround water levels were as high as approximately 23 feet above the screened intervals of Sall the monitoring wells The ground water gradient ranged widely,from 0 05 ft/ft along the Advanced GeoEnviroamental,Inc I