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16 May 2001 <br /> AGE-NC Project No 96-0229 <br />' Page 3 of 5 <br /> Icontoured In Figure 3 <br /> The general ground water gradient at the site was calculated to be approximately 0 002 ft/ft or <br /> approximately 11 feet per mile and inferred to be towards the northeast The ground water surface <br /> elevation at the site is approximately 20 to 23 feet above the slotted screen intervals in wells MW-1 <br /> and MW-IOB <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> IA total of eleven ground water samples were submitted to a DHS-certified laboratory TPH-g was <br /> detected in water samples collected from wells MW-1,MW-2,MW-3,MW-6,MW-7 and MW-1OA <br />' at concentrations as high as 90,000 micrograms per liter (,cg/1) <br /> BTEX compounds were detected in ground water samples collected from wells MW-1, MW-2, <br />' MW-3 and MW-6 at concentrations as high as 16,000 pg/l (xylene, MW-2) The highest benzene <br /> concentration was detected in sample MW-1 at a concentration of 8,900µg/1 <br /> • MTBE was detected (EPA 8260) In ground water samples collected from wells MW-1, MW-6, <br /> MW-7,MW-8 and MW-10 at concentrations as high as 580 µg/1 (MW-7), DIPE was detected in a <br /> water sample collected from MW-1 at a concentration of 11 ,ug/l No other fuel oxygenated additives <br /> were detected above laboratory reporting limits In the analyzed samples <br /> Previous and current analytical results of ground water monitoring well samples are summarized in <br /> Tables 2 and 3 The laboratory reports (Castle Analytical Laboratories Reference No 3639 and <br /> McCampbell Analytical Inc Lab ID 64269 through 64279)and chain-of-custody forms are presented <br />' - In Appendix B <br /> J <br /> e <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the findings of the March 2001 Investigation are <br /> • Ground water flow direction in the area of wells MW-1 through MW-10 was inferred <br /> towards the northeast at a gradient of 0 002 ft/ft This appears to be the prevailing flow <br /> direction for the area <br /> • Due to the low hydraulic gradient at the site, slight variations In ground water measurements <br /> or changes of recharge/discharge of the local ground water could greatly modify ground <br /> . water flow direction <br /> Advanced GeoEnviron mental,Inc <br /> I <br />