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' I i July 2002 . AGE-NC Project No 96-0254 ' Page 3 of 4 The depths to ground water in wells MW-I through MW-7 and GLMW-3 were measured between 6 99 feet and 8 75 feet below the tops of the well casings Ground water elevations at the site ranged between 28 16 feet above mean sea level (MSL) in well MW-7 and 30 26 feet above MSL in well ' MW-6 Ground water elevations at the site decreased an average 0 27 feet between the January 2002 and April 2002 sampling events Monitoring well GLMW-3 was "drowned" this quarter, the water level was 1 25 feet above the screened interval of this well The ground water flow direction for the 23 April 2002 sampling event was inferred to be toward the north at an average hydraulic gradient of 0 007 feet/feet, data from the deeper-screened wells MW-lA, MW-2A and MW-7 was not used to determine the ground water gradient Figure 3 ' illustrates the contoured ground water elevations ' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES TPH-g was detected in the samples collected from wells MWAB and MW-4 at concentrations of lie 1,700 micrograms per liter(µg/1) and 750 µg/1, respectively(Figure 4) TPH-d was detected in the water samples collected from wells MW-1B and MW-4 at concentrations of 100µg11 and 170 µg/l TPH-g and TPH-d were not detected in the remaining samples BTEX compounds were detected in the ground water samples collected from monitoring wells MW-1B and MW-4 at concentrations as high as 470 µg11 benzene, 85 µg/1 toluene and 82 µg/l xylenes in MW-1B and 12 µg/l ethylbenzene in MW-4 (Figure 5) MTBE was detected by EPA Method 8260B in the samples collected from MW-1B, MW2B and MW-4 at concentrations of 12 gg/l, 10 µg/l and 4 0 µg11, respectively (Figure 6) No other fuel additives were detected in the ground water samples The analytical results are summarized in Table 2 Copies of the laboratory reports(MAI Laboratory ID 0204358-OOIA to -010A), QA/QC reports and chain-of-custody forms are in Appendix B 4.0. SUMMARY AND CONCLUSIONS Based on the data collected duan this monitoring period, AGE concludes g g • The depth to ground water at the site was between 6 99 to 8 75 feet below the well casing tops Ground water elevations at the site decreased an average 0 27 feet between the January Advanced GeoEnvironmental Inc