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IIs <1) • 14 May 2004 AGE-NC Project No 97-0312 Page 3 of 5 3 1 GROUND WATER ELEVATION AND GRADIENT Depths to ground water at the site ranged between 62 60 to 63 85 feet below top of casing (btoc), ground water elevations were between 34 51 feet(UST-5) and 35 22 feet(UST-3)below mean sea level(MSL) The average ground water elevation at the site during the first quarter 2004 was 34 74 feet below MSL, an increase of 3 05 feet since the December 2003 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 momtor deeper ground water, with a 5-foot screened interval set at approximately 22 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 General ground water flow direction at the site was inferred to be generally toward the northeast with a gradient of approximately 0 001 ft/ft Figure 3 depicts the ground water elevation contours for March 2004 Monitoring 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 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES During the March 2004 monitoring event, the following analytes of concern were detected in the wells indicated • TPH-g was detected in the sample collected from well UST-5 at a concentration of 230 micrograms per liter (µg/1), • 1,2-DCA was detected in samples collected from wells MW-5 and MW-6 at concentrations of 390 µg/1 and 7 0 µg/1, respectively, • MTBE was detected in the sample collected from well UST-6 at concentrations 0 73 µg/1, • Toluene and xylenes were detected in the sample collected from UST-2 at concentrations of 0 66 gg/l and 0 52 µg/l, respectively, • Tetrachloroethene(PCE)was detected in the sample collected from UST-7 at a concentration of 1 7 µg11, and • Methylene chloride was detected in the samples collected from wells UST-4,UST-6,UST-7 and the large domestic well Advanced Geo Envi ron mental,Inc