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.. a <br /> 1 <br />' 20 April 2000 <br />' AGE-NC Project No 95-0143 <br /> Page 5of6 <br />' VW5 in order to achieve even minimal flow from these wells Organic vapor was measured at <br /> concentrations as high as 10,683 ppm in the extracted air stream (VW5) <br />' 34 <br /> ANALYTICAL RESULTS OF SOIL VAPOR SAMPLES <br />' TPH-g was detected in the soil vapor samples at concentrations of 1,400 ug/1 to 980 'Ug/1 <br /> Hydrocarbon concentrations decreased during each subsequent sampling event Analytical results <br />' are summarized on Table 6 The laboratory reports (MAI sample Nos 28041, 28042, 29384 and <br /> 29385 and PET sample I D AG0308-01 and -02) and chain-of-custody forms are included in <br /> Appendix C <br /> 3 5 MASS OF HYDROCARBONS REMOVED <br />' A total of approximately 53,548,145 cubic feet of soil vapor were extracted from the site between <br /> 03 November 1999 and 31 March 2000 Approximately 1956 kilograms, or 699 gallons, of gasoline <br />' was removed from the site between 03 November 1999 and 31 March 2000 <br />' An Initial removal rate of approximately 7 0 gallons per day was calculated The removal rate on 31 <br /> March 2000 was calculated to be 3 6 gallons per day <br /> I4.0 SUMMARY/CONCLUSIONS <br /> Based upon data collected from the site, AGE concludes <br /> • Ground water elevation increased approximately 0 58 feet between November 1999 and <br /> I February 2000 and approximately 2 6 feet between February and March 2000 The inferred <br /> ground water flow direction remains toward the north to northeast at the site <br /> I • Petroleum hydrocarbon were detected In each well sampled at concentrations ranging from <br /> 57 ppb (MW-16) to 220,000 ppb (MW-3) Measurable free product was not encountered <br /> during the February 2000 monitoring event Fuel oxygenates were not detected In ground <br /> Iwater samples collected during the February 2000 monitoring event <br /> • Operation of the SVE and IAS units was Initiated on 03 November 1999 The SVE units <br /> extracts from 260 to 278 cfm with an LEL of 4 to 6 percent The sparging system supplies <br /> approximately 20 cfh of air to each sparging well <br /> • Ground water mounding Is occurring within the vapor extraction wells However, the lateral <br /> extent is very limited and ground water levels return to normal upon Interruption of vapor <br /> IAdvanced GeoEnNironmental,Inc <br />