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' 04 January 2006 <br /> AGE-NC Project No 97-0351 <br /> ' Page 3 of 4 <br /> ' 32 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the ground water sample collected from well MW-1 at a concentration of <br /> ' 3,400 micrograms per liter (µg/l) BTEX compounds were also detected in well MW-1 at the <br /> following concentrations 20 µg11 benzene, 4 7 gg/l toluene, and 14 gg/l total xylenes No other <br /> petroleum hydrocarbons were detected in ground water samples from the other monitoring wells <br /> Analytical results of ground water samples are summarized in Table 2 The laboratory report(CTEL <br /> Project No CT214-0510113), quality assurance/quality control (QA/QC) report, and chain of <br /> ' custody form are included in Appendix C Documents confirming the upload of laboratory electronic <br /> deliverable format (EDF) files and depth to water measurements to GeoTracker are included in <br /> Appendix D <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based on the environmental data collected at the site during the third quarter 2005,AGE concludes <br /> • On 18 October 2005,depth to ground water ranged from 8 41 feet to 9 87 feet below the tops <br /> of the well casings Ground water elevation at the site ranged from 0 71 feet to 1 11 feet <br /> above MSL and averaged approximately 0 87 feet above MSL, indicating a decrease in <br /> elevation of approximately 0 70 feet since the last ground water monitoring event in July <br /> 2005 <br /> • Ground water at the eastern portion of the site was inferred to be flowing toward the <br /> southeast under a hydraulic gradient of approximately 0 004 ft/ft,while ground water at the <br /> western portion of the site flowed towards a north-west plunging trough in the potentiometric <br /> ' surface under calculated gradients between approximately 0 003 ft/ft and 0 009 ft/ft <br /> • TPH-g was detected in the ground water sample collected from well MW-1 at a <br /> concentration of 3,400 µg11 BTEX compounds were also detected in well MW-1 at the <br /> following concentrations 20 µg/l benzene, 4 7 µg11 toluene, and 14 µg/l total xylenes <br /> • At the present time,the vertical extent of dissolved hydrocarbons has not been defined <br /> t <br /> ' S.O. RECOMMENDATIONS <br /> Based on the findings recounted in this report, AGE recommends <br /> ' Continuation of quarterly ground water monitoring events,the next event will be scheduled <br /> ' Advanced GeoEnvnronmental,Inc <br />