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20 October 2004 <br /> . AGE-NC Project No 98-0497 <br /> ' Page 3 of 4 <br /> ' 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> The analytical results from the 20 May 2004 ground water sampling event are as follows <br /> ' • TPH-g was detected in well MW-1 at a concentration of 5,400 micrograms per liter(µg/1) <br /> The laboratory report noted that the detected concentration was mostly in the diesel range, r <br /> ' • TPH-d was detected in MW-1 at a concentration of 32,000 µg/l, <br /> • BTEX compounds and MTBE were not detected in the five groundwater samples analyzed, <br /> Laboratory results of the water samples analyzed are summarized in Tables 2 and 3 Copies of the <br /> ' laboratory report for the quarterly monitoring event (CTEL Project No CT214-0405132), quality <br /> assurance/quality control (QA/QC) report and chain of custody forms are in Appendix B <br /> GeoTracker confirmation pages of the submitted laboratory electronic deliverable format(EDF)files <br /> are included in Appendix C r <br /> ' • 4 0 SUMMARY AND CONCLUSIONS <br /> The findings of the 20 May 2004 ground water monitoring event include the following <br /> • The average calculated ground water elevation was approximately 40 74 feet below MSL, <br /> and was within the screened interval of each monitoring well Ground water flow direction <br /> near the former UST location was to the east-northeast with an average gradient of <br /> approximately 0 002 ft/ft Historically,the flow direction and gradient have been similar to <br /> those calculated for this quarter <br /> tContamination by TPH-g and TPH-d was encountered in the ground water sample collected <br /> and analyzed from MW-1 The detected concentrations of TPH-d in samples collected from <br /> ' MW-1 have fluctuated significantly during the past nine monitoring events <br /> • No analytes of concern were detected in the ground water samples collected from wells <br />' MW-2 through MW-5 <br /> • The hydrocarbon-impacted ground water plume appears to be limited to the former UST area <br /> immediately surrounding MW-1 The inferred areal extent of hydrocarb on-impacted ground <br /> _ water is illustrated on Figure 4 <br /> • <br /> Advanced GeoEnvironmental <br />