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' 01 February 2006 <br /> AGE-NC Project No 04-1239 <br />' Page 3 of 4 <br />' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in well MW-9 at a concentration of 59,000 micrograms per liter (µg/1) <br />' BTEX compounds were detected in well MW-9 at the following concentrations 15 µg/1 benzene, <br /> 4,500 pg/l toluene, 1,900 µg/1 ethylbenzene, and 10,700 µg/1 total xylenes <br />' No other analytes were detected at or above laboratory detection limits in the ground water samples <br /> analyzed The analytical results of the ground water samples collected on 23 November 2005 are <br />' summarized in Table 2 The laboratory report (CTEL Project No CT214-0511181), quality <br /> assurance/quality control (QA/QC) report, and chain of custody form are included in Appendix C <br /> Documents confirming the upload of laboratory electronic deliverable format(EDF)files and depth <br />' to water measurements to GeoTracker are included in Appendix D <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the data collected from the site, AGE concludes <br /> At the time of the November 2005 sampling event, depths to ground water ranged from <br /> 20 13 feet to 21 13 feet below the tops of the well casings Ground water elevation at the site <br /> ranged from 10 01 feet to 10 43 feet below MSL, and averaged approximately 10 21 feet <br /> below MSL, indicating a decrease in average ground water elevation of 0 61 feet since the <br /> Ilast monitoring event in September 2005 <br /> • Ground water at the site was inferred to be flowing toward the southwest under a hydraulic <br /> gradient of approximately 0 007 ft/ft <br /> I • Petroleum hydrocarbon concentrations in well MW-9 decreased between the September and <br /> November 2005 ground water monitoring events TPH-g was detected in well MW-9 at a <br /> I concentration of 59,000 µg/1 BTEX compounds were detected at the following <br /> concentrations 15 [ig/1 benzene, 4,500 µg11 toluene, 1,900 µg/1 ethylbenzene, and <br /> 10,700 µg/1 total xylenes <br /> • The lateral extent of petroleum hydrocarbon contamination is defined to the south by well <br /> MW-11 and to the southwest by we]I MW-10 However, the current upgradient well is <br /> significantly impacted with hydrocarbons,demonstrating either a shift in ground water flow <br /> direction or an additional source for the dissolved hydrocarbons plume <br /> I <br /> 4• <br /> Advanced GeoEnvironmental,Inc <br /> I <br />