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01 October 2004 <br /> • AGE-NC Project No 00-0764 <br /> ' Page 3 of 4 <br /> The elevation of ground water in each well was calculated by subtracting the ground water depth <br /> from the surveyed casing elevation Ground water elevations in the shallow wells ranged between <br /> 20 85 feet (MW-2) to 2106 feet(MW-4)below mean sea level (MSL) The relative ground water <br /> ' elevation data is summarized in Table 1 <br /> Ground water flow direction in the area of the former USTs was Inferred to be towards the east to <br /> ' northeast at a gradient of approximately 0 005 foot per foot (ft/ft), as depicted on Figure 3 <br /> ' 32 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> The only chemical of concern detected was TPH-g in groundwater sample MW-3,at a concentration <br /> t of 360 micrograms per liter (}ig/l) Laboratory results of the analyzed samples are summarized in <br /> Table 2 The laboratory report(CTEL Prod ect No CT214-0409040), quality assurance and quality <br /> control (QA/QC) report and chain of custody forms are included in Appendix C Documents <br /> tconfirming the upload of laboratory electronic deliverable format (EDF) files and depth to water <br /> measurements to GeoTracker are Included in Appendix D <br /> 4 0. SUMMARY AND CONCLUSIONS <br /> Based upon the results of this quarterly monitoring event, AGE concludes <br /> ' • Ground water flow direction was inferred to be towards the east from the former UST <br /> location, at a gradient of approximately 0 005 ft/ft <br /> • TPH-g was detected in the sample from ground water monitoring well MW-3 at a <br /> ' concentration of 360µg11 The concentration of TPH-g in ground water is consistent with <br /> previous sampling events This indicates the impacted ground water plume is stable <br /> • At the present time, the vertical extent of the dissolved hydrocarbons have been defined by <br /> borings B1 and well MW-5 The lateral extent of the dissolved hydrocarbons have been <br /> defined by the shallow wells <br /> ' 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation, AGE recommends <br /> • Continued quarterly ground water monitoring, the next monitoring event is scheduled for <br /> . December 2004 <br /> ' Advanced GeoEnvironmental,Inc <br />