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! 5 I. -l4 I I 4 03 SY eptember 2004 • AGE-NC Project No 97-0312 I w Page 3 of 5 ! J J 3 1 GROUND WATER ELEVATION AND GRADIENT Depths to ground water at the site ranged between 65 57 to 66 31 feet below top of casing (btoc), ; ground water elevations were between 37 48 feet(UST-2) and 37 69 feet(UST-6)below mean sea rs level (MSL) The average ground water elevation at the site during the Second Quarter 2004 was ' 37 60 feet below MSL, a decrease of 2 9 feet since the March 2004 monitoring event The ground water table occurred within the'screened intervals of monitoring wells UST-2 through UST-6 Monitoring well UST-7 was designed to monitor deeper ground-water, with a 5-foot screened interval set at approximately 21 feet below the water table, since it possibly is monitoring a different hydraulic zone, UST-7 was not used to determine gradient and flow direction I - General ground water flow direction at the site was inferred to be toward the northeast with a I' gradient of approximately 0 001 fl/ft Figure 3 depicts the ground water elevation contours for June 2004 IMonitoring data from UST-2, UST-3, UST-4 and UST-6 was combined with monitoring data collected from the adjacent Moore Truck Lines property to determine an approximate regional ground water flow direction I3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES During the June 2004 monitoring event,the following analytes of concern were detected in the well I samples tl • TPH-g was detected in the sample -collected from well UST-5 at a concentration of I230 micrograms per liter(µg/1), " • 4,2-DCA was detected in samples collected from wells MW-5 and MW-6 at concentrations I of 400,µg/1 and 3 4 µg/l, respectively, T • MTBE was detected in the sample'collected from well UST-6 at 0 64 µg/1, r • Tetrachloroethene(PCE)was detected in the sample collected from UST-7 at a concentration of 19 µg/1, and 4 • Methylene chloride was not detected in samples collected,from wells, as during previous monitoring events No other target analytes were detected at or above laboratory reporting levels in the ground water samples collected this quarter The laboratory reports(MAI Work Orders 0404468 and 0406066)and chain of custody forms are included in Appendix B Analytical results of water samples collected during the Second Quarter 2004 are summarized in Tables 2 and 3 The analytical results of all water IAdvanced GcoEnviro n mental,Inc t ! t I S I `