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02 May 2002 <br />' AGE-NC Project No 98-0452 <br /> Page 3 of 4 <br />' 4.0. FINDINGS <br />' Ground water elevation and flow direction were calculated from field data, hydrocarbon-Impact to <br /> ground water was assessed by laboratory analysis of the ground water samples <br /> 4 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' The elevation of ground water in each well was calculated by subtracting the depth to ground water <br /> from the surveyed well head elevations (Table 1) Depths to ground water ranged from 4 14 feet to <br /> 5 05 feet below the tops of the well casings Ground water elevations at the site ranged from-0 89 <br /> feet in MW-1 to -0 96 feet in MW-3 relative to mean sea level The ground water gradient was <br /> calculated to be approximately 0 001 ft/ft with a flow direction toward the north-northeast(Figure 3) <br /> 4 2 ANALYTICAL RESULTS OF WATER SAMPLES <br />' TPH-d, TPH-g and BTEX constituents were not detected above laboratory reporting limits in the <br /> four ground water samples analyzed <br /> MTBE was detected by EPA Method $260 in the ground water samples collected from MW-1, <br /> MW-2 and MW-3 at concentrations of 1 7 micrograms per liter (µg/1), 110 gg/l and 130 4g/l, <br /> respectively TAME was detected in the sample collected from MW-3 at a concentration of 1 3 µg/l <br /> No analytes of concern were detected in the sample collected from the domestic well <br /> Analytical results of ground water samples are summarized on Tables 2 and 3 The laboratory report <br /> (MAI Lab IDs 0204024-001 C through 020424-004C) and chain-of-custody forms are included in <br /> Appendix B <br /> 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes the following <br /> • Average ground water elevation at the site has remained relatively stable since monitoring <br /> began in September 2000 <br /> I • The ground water gradient was calculated to be 0 001 ft/ft with a flow direction toward the <br /> north-northeast Ground water flow direction during previous monitoring events has <br /> alternated seasonally from the northeast to the southwest The most recent groundwater flow <br /> direction was approximately 180° from the direction reported for the third quarter 2001 <br /> IAdvanced GeoEnvironmental,Inc <br />