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i <br /> 11 July 2000 <br /> AGE-NC Project No 95-0130 <br /> Page 3 of 5 <br /> I164 feet between the October 1999 and March 2000 ground water monitoring events The general <br /> ground water gradient at the site was calculated to be approximately 0 004 ft/ft or approximately 21 <br /> feet per mile and directed towards the northeast The ground water surface elevation at the site is <br /> approximately 13 feet to 23 feet above the slotted screen intervals in wells MW-1 through MW-5 <br /> and approximately 5 feet to 11 feet above the slotted screen intervals in wells VW-I C, VW-2A and <br /> VW-3A <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in water samples collected from wells MW-3, MW-5, VW-1C, VW-2A and <br /> VW-3A at concentrations between 160 and 250,000 micrograms per liter(,ug/l) <br /> Various BTEX samples compounds were detected in water les collected from MW-2, MW-3, MW-5, <br /> P p <br /> VW-1C, VW-2A and VW-3A at concentrations as high as 45,000 ,ug/1 (VW-1C) The greatest <br /> benzene concentrations were detected in the water sample collected from VWAC at 38,000 ,ug/l <br /> MTBE was detected by EPA Method 8020 in water samples collected from wells MW-3, VW-2A, <br /> and VW-3A at concentrations ranging between 20 and 2,300 4g/1 (VW-3A) <br /> MTBE was detected utilizing EPA Method 8260 Modified in water samples collected from wells <br /> I MW-3, VW-1C, VW-2A and VW-3A at concentrations ranging between 14 µg/l and 2,300 µg/1 <br /> TBA was detected in water samples collected from wells MW-3 and MW-5 at concentrations as high <br /> as 91 1ug/1 No other fuel genated compounds were detected during the laboratory analysis <br /> 1,2-DCA was detected in samples collected from MW-2, MW-3, VW-1C, VW-2A and VW-3A at <br /> concentrations ranging between 2 and 320 4g1l Analytical results of the ground water samples are <br /> I summarized in Table 2 The laboratory reports (Castle Analytical Laboratory Reference No 2943 <br /> and McCampbell Analytical Inc I D 35633 through 35640) and chain-of-custody forms are <br /> presented in Appendix B <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> The implications of the February 2000 ground water monitoring event results are as follows <br /> • Ground water flow direction at the site appeared to be oriented generally east-northeast to <br /> east at a gradient of 0 004, due to the low gradient at the site, slight variations in ground <br /> water measurements or changes of recharge/discharge of the local ground water could greatly <br /> modify ground water flow direction <br /> • Wells MWA through MW-5, VW-1C, VW-2A and VW-3A are "drowned", and yield <br /> Advanced GeoEnvironmental,Inc <br />