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03 May 2000 <br />' AGE-NC Project No 95-0184 <br /> Page 3 of 4 <br />' elevation and flow direction Measurable free product was not encountered at the site dunng the <br /> February 2000 monitonng event <br />' A ground water depression was detected near VW-3 The inferred ground water flow direction in <br /> February 2000 was easterly with a gradient of approximately 0 006 ft/ft (Figure 3) <br /> 1 1 <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' TPH-g was detected in all sampled wells at concentrations ranging from 220 parts per billion (ppb, <br /> reported as micrograms per liter,,ug/l) in MW-7 to 170,000 ppb in VW-513 TPH-d was detected in <br />' the sample from MW-4 at a concentration of 7,300 ppb <br /> Benzene was also detected in all wells sampled at concentrations ranging fi om 4 4 ppb in MW-7 to <br /> 30,000 ppb in VW-3 The other BTEX compounds were detected at concentrations ranging from 2 3 <br /> ppb of ethylbenzene in MW-7 to 51,000 ppb of toluene in VW-5B <br /> TBA was detected in the sample from MW-3 at a concentration of 17 ppb Other fuel oxygenates <br /> were not detected during the February 2000 monitonng event 1,2-Di chloroethane (DCA) was <br /> detected in wells MW-3, MW-7 and VW-2B at concentrations of 2 1 ppb, 1 4 ppb and 1,300 ppb, <br />' respectively Nine additional constituents were detected by EPA Method 8260 at concentrations as <br /> high as 3,900 ppb (1,2,4-tnmethylbenzene, VW-4) <br />' Analytical results are summanzed on Tables 2 and 3 The laboratory report (MAI sample Nos <br /> 31572-31580) and chain-of-custody forms are included in Appendix B <br /> 4.0 DISCUSSION AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br />' • Petroleum hydrocarbons were detected in each well sampled, at concentrations as high as <br /> 170,000 ppb No free product was measured during this sampling event, however, the <br /> majonty of the well screens are drowned and are not likely to produce direct evidence of free <br />' product <br /> • TBA was detected in the sample collected from MW-3 at a concentration of 17 ppb Other <br />' oxygenates were not detected dunng the Februaiy 2000 monitoring event, <br /> • Ground water levels are as high as 23 6 feet above the screened interval The hydrocarbon <br /> concentrations detected in these `drowned' wells may not be representative of shallower <br /> Advanced Gl1)En%Lronminta1 Inc <br />