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23 December 1999 <br /> AGE-NC Project No. 95-0197 <br /> Page 3 of 4 <br /> water elevations, as measured on 08 October 1999 are depicted in.Figure 3. Ground water elevation <br /> at the site decreased an average 0.73 feet between.the July 1999 and the October 1999 ground water <br /> monitoring events. The general ground water gradient at the site was calculated to be approximately <br /> 0.001 ft/ft or approximately 5 feet per mile; the general ground water flow direction was calculated <br /> towards the north-northeast. <br /> In October 1999, the depths to.first encountered ground water in wells MW-1, MW-2, MW-3, and <br /> MW-4 were approximately 1.5'to 4 feet below the tops of the well screens. Therefore, these wells <br /> are "properly screened", and yield samples representative of shallow ground water conditions. <br /> 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> Groundwater samples were collected from wells MW-1,MW-2,MW-3, and-MW-4 in October 1999 <br /> and submitted to a DHS-certified laboratory. TPH-g and TPH-d were,not detected in any analyzed <br /> ground water samples. <br /> BTEX compounds and MTBE (EPA Method 8020) were not detected in ground water samples <br /> collected from wells MW-1, MW-2, MW-3, and MW-4; <br /> MTBE was detected utilizing EPA Method 8260 Modified in the ground water sample collected <br /> from MW-2 at a concentration of 1.7'µg/1; TBA was also detected in the ground water sample from <br /> MW-2 at a concentration of 5.0µg11;no other fuel-oxygenate analytes were detected above laboratory <br /> reporting limits. <br /> The analytical results of quarterly ground water samples are summarized in Table 2. The laboratory <br /> report (McCampbell Analytical.Inc.-Lab.I.D.No. 23191 through 23194)and chain-of-custody form <br /> is included in Appendix B. <br /> 4.0. , SUMMARY AND CONCLUSIONS <br /> Based upon data collected during the October 1999 monitoring event, AGE concludes: <br /> Ground water monitoring data collected in the area of wells MW-1, MW-2, MW-3, and <br /> MW-4 indicated a ground water flow direction generally toward the north-northeast at a <br /> gradient of 0.001 ft/ft.(Figure 3). <br /> Due to the low gradient at the site, slight variations in ground water measurements or <br /> changes of recharge/discharge of the local ground water could greatly modify ground water <br /> flow direction. <br /> Advanced Geo Environmental,Inc. <br />