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' 24 April 2003 p , AGE-NC Project No 95-0144 ' Page 3 of 4 ' 3 1 GROUND WATER ELEVATION AND GRADIENT j The elevation of ground water in each well was calculated by subtracting the depth to water from the ' surveyed casing elevation(Table 1) During the February 2003 monitoring event the average ground water elevation at the site was 8 71 feet below mean seal level(MSL),an increase of 0 65 feet since the December 2002 monitoring event The average depth to water at the site was approximately 17 7 feet bsg The approximate hydraulic gradient for the February 2003 monitoring event was inferred to be 0 003 ft/ft with a flow direction toward the north-northeast (Figure 3) ' Ground water was within the screened intervals of shallow-screened wells MW-11, MW-12, MW-13, MW-19A, MW-20A and MW-21 A, but was between 107 feet and 4 18 feet above the ' screened interval in the shallow-screened wells MW-1, MW-2, MW-4, MW-5 and MW-8 Ground water elevations in the deep-screened nested wells MW-19B, MW-20B and MW-21B, ' screened in the Lower Water Zone, were between 165 feet and 195 feet lower than in the wells screened in the Upper Water Zone The approximate hydraulic gradient rn the deeper-screened ground water monitoring wells for the February 2003 monitoring event was inferred to be 0 009 ft/ft • with a flow direction toward the west-northwest (Figure 3) . I ' 3 2 ANALYTICAL RESULTS OF WATER SAMPLES During the February 2003 momtornng event, TPH-g was detected in the ground water sample ' collected from monitoring well MW-2 at a concentration of 58 micrograms per liter (µg11) Other target analytes were not detected above laboratory reporting limits in the samples collected from ' wells MW-2, MW-4 and MW-5 Analytical results for the first quarter 2003 monitoring event are summarized on Tables 2 and 3 ' Analytical results of recent and historical ground water samples are summarized on Tables 4 and 5 The laboratory report (MAI Lab IDs 0302329-001 through 00302329-003) and chain-of-custody forms are included in Appendix B I 4.0. SUMMARY/CONCLUSIONS ' Based upon data collected during the ground water monitoring event, AGE concludes ' The average ground water elevation at the site was 8 71 feet below MSL Ground water remained above the screened interval in five of the shallow-screened wells sampled during the first quarter of 2003 Advanced GeoEnvironmental,Inc