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I26 January 2004 <br /> • AGE-NC Project No 97-0312 <br /> IPage 3 of 4 <br /> I3 1 GROUND WATER ELEVATION AND GRADIENT <br /> Depths to ground water at the site ranged between 65 83 to 66 81 feet below top of casing (btoc), <br /> ground water elevations were between 37 58 feet (UST-5) and 37 89 feet(UST-3)below mean sea <br /> level (MSL) The average ground water elevation had increased by an average of 2 3 feet since the <br /> September 2003 monitoring event The ground water table occurred within the screened intervals <br /> of momtonng wells UST-2 through UST-6 Monitoring well UST-7 was designed to monitor deeper <br /> ground water, with a 5-foot screened interval set at approximately 22 feet below the water table, <br /> since It possibly is monitoring a different hydraulic zone,UST-7 was not used to determine gradient <br /> and flow direction <br /> General ground water flow direction at the site was inferred to be northeast with a gradient of <br /> Iapproximately 0 0005 ft/8 Figure 3 depicts the ground water elevation contours for December 2003 <br /> Monitoring data from UST-2,UST-3 and UST-4 was combined with monitoring data collected from <br />' the adjacent Moore Truck Lines property to determine an approximate regional ground water flow <br /> direction <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> During the December 2003 monitoring event,TPH-g,benzene,toluene and 1,2-DCA were detected <br /> in the sample collected from well UST-5 at concentrations of 350 micrograms per liter (µg/1), 14 <br />' gg/l, 0 88 µg/l and 390µg11,respectively 1,2-DCA were detected In the sample collected from well <br /> UST-6 at concentrations 4 2 gg/l MTBE was detected In the sample collected from UST-6 at a <br /> concentration of 0 56 gg/l Tetrachloroethene (PCE) was detected in the sample collected from <br /> UST-7 at a concentration of 2 0 gg/l <br /> No other target analytes were detected at or above laboratory reporting levels in the ground water <br />' samples collected this quarter The laboratory reports (MAI Lab IDs 0312306-001 through <br /> 0312306-007) and chain-of-custody forms are included in Appendix B Analytical results of water <br /> samples collected during the fourth quarter 2003 are summarized on Tables 2 and 3 The analytical <br />' results of all water samples are summarized on Tables 4 and 5 Figures 4, 5 and 6 Illustrate the areal <br /> extent of TPH-g-, benzene- and 1,2-DCA-impacted ground water <br /> I <br /> IAdvanced CeoEnvironmental,Inc <br /> I ' <br />