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' 20 January 2005 • AGE-NC Project No 04-1045 ' Page 6 of 7 ' hydrocarbon contamination is shown on Figure 4 Cross sectional views showing the vertical extent of adsorbed petroleum hydrocarbon contamination are depicted in Figure 5 ' 3 3 GROUND WATER GRADIENT AND FLOW DIRECTION ' At the time of the November 2004 sampling event, depths to ground water ranged from 22 0 feet (MW-3)to 22 60(MW-2)feet below the tops of the well casings(Table 3),water levels were at least 7 6 feet below the top of the well screens, indicating that the wells are properly screened and ' representative of shallow ground water conditions The average ground water elevation calculated from depths to water was approximately 12 52 feet below mean sea level (MSL) Ground water flow was inferred to be southwest at a hydraulic gradient of approximately 0 003 foot/foot Figure 6 illustrates the contoured ground water elevations as measured on 24 November 2004 1 ' . 3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in ground water samples collected from wells MW-1 and MW-2 at Iconcentrations of 78,000 micrograms per liter (µg/1) and 210 µg/l, respectively One or more BTEX compounds were detected in ground water samples collected from wells MW-1 ' through MW-3, the maximum BTEX concentrations were detected in well MW-1 at 4,900 µg/l benzene, 18,000 µg/1 toluene, 3,900 µg/1 ethylbenzene and 12,200 µg/1 total xylenes ' 1,2-DCA was detected in ground water samples collected from well MW-1 at a concentration of 420 µg/1 ' No other analytes were detected at or above laboratory reporting limits in the ground water samples analyzed The analytical results of the ground water samples collected on 24 November 2004 are summarized in Table 2 A plane view map depicting the lateral extent of petroleum hydrocarbon contamination is shown on Figure 7, and cross-sectional views showing the vertical extent of dissolved petroleum hydrocarbon contamination are depicted in Figure 8 The laboratory report (CTEL Project No CT214-0411198), QA/QC reports and chain of custody form are included in IAppendix G Documents confirming the upload of laboratory electronic deliverable format(EDF) files and depth to water measurements to GeoTracker are included in Appendix H I Advanced GeoEnvlronmental,Inc