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30 September 2003 <br /> i AGE-NC Project No 95-0130 <br /> Page 3 of 6 <br /> 3 1 GROUND WATER ELEVATION AND GRADIENT <br /> IThe depths to ground water from the purged wells were measured between 41 38 and 42 46 feet <br /> below the top of the well casings Ground water elevations were calculated to be between 25 63 <br /> (MW-1)feet and 26 10(MW-3)feet below mean sea level(MSL) Generally,ground water elevation <br /> at the site Increased an average 0 44 feet between the March 2003 and the June 2003 ground water <br /> monitoring events Ground water flow direction In the area bound by wells MW-1 through MW-5 <br /> Iwas Inferred to be toward the northeast at a gradient of 0 005 feet/feet or less, or approximately 26 <br /> feet per mile The ground water elevation data during the June 2003 ground water monitoring event <br /> IIs depicted In Figure 3 <br /> 3 2 LABORATORY RESULTS OF MONITORING WELL GROUND WATER SAMPLES <br /> A total of sixteen ground water samples were submitted to Castle Analytical Laboratory, a DHS- <br /> certified laboratory, for analysis <br /> TPH-g was detected In water samples collected from wells MW-2, MW-3, MW-5, MW-6 (B - E), <br /> MW-7 (B -E), VW-1 C,VW-2A and VW-3A at concentrations as high as 180,000 micrograms per <br /> liter (µg/1) In the sample collected from VW-1C <br /> I BTE&X compounds were detected In the above monitoring well samples at concentrations as high <br /> as 43,000 µg/1 (toluene from VW-1C and benzene from MW-7B) <br />' MTBE was detected by EPA Method 8260 in ground water samples collected from wells MW-2, <br /> MW-3, MW-5, MW-6 (B - E), MW-7B, VW-i C, VW-2A and VW-3A at concentrations as high <br /> as 2,300µg/1(VW-3A) 1,2-DCA was detected In groundwater samples collected from wells MW-2, <br /> MW-7B, VW-1C and VW-2A at concentrations as high as 180 µg11 (MW-7B) <br /> No other fuel components were detected In the ground water samples Previous and current analytical <br /> results of ground water monitoring well samples are summarized In Tables 3 and 4 The laboratory <br /> reports(Castle Analytical Laboratory Reference No 5793)and chain-of-custody forms are presented <br />' In Appendix B <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The Implications from the June 2003 ground water monitoring event are as follows <br /> lie • Ground water flow direction was Inferred to be towards the northeast at a gradient of <br /> 0 005 feet/feet In the area bound by wells MW-1 through MW-5 The wells utilized for the <br />' Advanced GeoEnvironmental,Inc <br />