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1 <br /> 06 November 2006 <br /> AGE-NC Protect No 04-1168 <br />' Page 3 of 5 <br />' Ground water flow was inferred to be flowing towards the south-southwest under an average <br /> hydraulic gradient of approximately 0 009 foot/foot(ft/ft) figure 3 illustrates the contoured ground <br /> water elevations as measured on 03 February 2006 <br /> 3 2 SECOND QUARTER 2006 GROUND WATER GRADIENT AND FLOW DIRECTION <br />' At the time of the June 2006 sampling event,depths to ground water ranged from 42 60 feet(MW-2) <br /> to 43 40 feet (MW-3) below the tops of the well casings Ground water elevations at the site <br /> averaged approximately 18 66 feet below MSL (Table 1) The ground water levels in wells MW-1 <br /> through MW-3 were above the tops of the well screens, Indicating that the wells were "drowned" <br /> and ground water samples may not be representative of shallow ground water conditions <br /> Ground water flow was Inferred to be flowing towards the southwest under an average hydraulic <br /> gradient of approximately 0 004 ft/ft Figure 4 illustrates the contoured ground water elevations as <br /> measured on 12 June 2006 <br /> 3 3 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was reported during the second quarter monitoring event in ground water samples collected <br />' from wells MW-1 through MW-3 at concentrations of 110 micrograms per liter(gg/l), 110 µg/1 and <br /> 140 µg/l, respectively <br /> The BTEX compound benzene was reported in ground water sample MW-3 at a concentration of <br /> 4 0 ggll, and total xylenes was reported in sample MW-2 at a concentration of 3 4 Jig/1 The second <br /> quarter 2006 ground water monitoring event marked the first time benzene was reported in ground <br /> water samples <br /> The fuel additive MTBE was detected in ground water samples collected from wells MW-1 through <br /> MW-3 at concentrations between 11 µg/1 (MW-2) and 15 µg/1 (MW-1) <br /> No other constituents of concern were detected at or above laboratory detection limits in the ground <br /> water samples analyzed The analytical results of the ground water samples collected on 12 June <br /> 2006 are summarized on Table 3, a map of dissolved hydrocarbons is presented as Figure 5 The <br /> I laboratory report (CTEL Project No CT214-0606096), QA/QC report, and chain-of-custody form <br /> are included in Appendix E The Laboratory report in electronic data file(EDF)format was uploaded <br /> to the State Water Board's Geotracker database and confirmation sheets are included as Appendix F <br /> I <br /> Advanced GeoEnm oninental,Inc <br /> I <br />