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1 , ' 02 October 2000 • AGE-NC Project No 97-0301 Page 3 of 5 be between 22 67 feet and 22 93 feet below mean sea level Ground water elevation at the site decreased an average 101 feet between the March 2000 and the June 2000 ground water monitoring events The ground water elevation data for MW-1, MW-2, MW-3 and MW-4 during the March 2000 ground water monitoring event is depicted in Figure 3 Ground water flow direction for the area bound by wells MW-1,MW-2,MW-3 and MW-4 was generally toward the northwest at a gradient of 0 003 ft/ft, or approximately 16 feet per mile (Figure 3) 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES ' A total of four ground water samples were submitted to a DHS-certified laboratory in June 2000 TPH-g was detected in the water sample collected from well MW-1 at a concentration of 42,000 micrograms per liter(µg/I), TPH-d was detected in water samples collected from wells MW-1 and MW-4 at concentrations of 6,200 and 79,ug/l, respectively BTEX compounds were detected in the ground water sample collected from well MW-1 at concentrations ranging as high as 5,800µg11,benzene was detected at a concentration of 2,100µg11 EDB and 1,2-DCA were detected in the ground water sample collected at MW-1 at concentrations of 64 and 990µg/l, respectively ' MTBE was detected in the ground water sample collected from well MW-3 at a concentration of 0 85 µg/1 TBA was detected in the ground water sample collected from MW-1 at a concentration ' of 240µg11 No other fuel oxygenates were detected in any other analyzed ground water samples at concentrations above the respected laboratory reporting limits Analytical results of the ground water samples are summarized in Table 2 The laboratory reports (Castle Analytical Laboratories Reference No 3058 and McCampbell Analytical Inc I D No 40774 through 40777) and chain-of-custody forms are presented in Appendix B 4.0. SUMMARY AND CONCLUSIONS ' The implications from the June 2000 ground water monitoring event are as follows p ln' g • Ground water flow direction at the site appeared to flow generally towards the northwest at a gradient of 0 003, due to the low gradient at the site, slight variations in ground water ' measurements or changes of recharge/discharge of the local ground water could greatly modify the inferred ground water flow direction iThe ground water elevation at the site was approximately four feet above the screen intervals ' Advanced GeoEnvironmental,Inc