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18 February 2003 <br /> AGE-NC Project No 98-0448 <br /> Page 5 of 8 <br /> I collected from wells MW-1,MW-4B and MW-8 at ccricentrations as high as 1 3µg/l(MW-8),TBA <br /> was detected in the samples collected from wells MW-1 and MW-4A at concentrations of 7 4µg/1 <br /> and 20µg/1, respectively <br /> I No other fuel components were detected b laboratory analysis Previous and current analytical <br /> p Y rY Y <br /> results of ground water monitoring well samples are summarized in Tables 3 and 4 The laboratory <br />' reports (McCampbell Analytical Inc Work Order 0212065) and chain-of-custody forms are <br /> presented in Appendix C <br /> 43 RESULTS OF VAPOR EXTRACTION <br /> Between 11 September 2002 and 17 December 2002, the SVE and IAS remediation systems were <br /> continuously operational for 2,328 hours, the SVE and 1AS systems have totaled 14,896 hours of <br /> operation since initiation on 16 April 2001 (Table 7) During the September,October,November and <br /> December 2002 operational period, SVE inlet flow rates ranged between 36 and 42 cubic feet per <br /> minute (cfin), differential pressures ranged between 0 40 and 0 60 inches of water, and induced <br /> • vacuum measurements ranged between 60 and 75 inches of water Utilizing;aphoto ioiuzationmeter <br /> (PCD), SVE inlet hydrocarbon concentrations were measured between 81 and 221 parts per million <br /> (ppm),however a general concentration trend was not established from the PID field measurements <br /> I Field measurements are summarized in Table 6 <br /> i <br /> I4 4 ANALYTICAL RESULTS OF SOIL--GAS VAPOR SAMPLES <br /> SVE air flow samples were collected on 30 October, 11 November and 17 December 2002 TPH-g <br /> was detected from all influent SVE air flow samples at concentrations as high as 400 µg/1 <br /> (17 December 2002) <br /> BTEX compounds were detected in all influent SVE air flow samples at concentrations as lugh as <br /> 11 ugll (xylene, 30 October 2002) Benzene was detected in the October and the November 2002 <br /> influent SVE air flow samples at concentrations as high as 1 5 µg11 Analytical results of SVE air <br /> flow samples are summarized in Table 5 The laboratory reports(McCampbell Analytical Laboratory <br /> Work Order 0210563 and Castle Analytical Laboratory Reference Number's 5219 and 5333) and <br /> I chain-of-custody forms are presented in Appendix D A plot of influent TPH-g SVE air flow <br /> concentrations versus time is in Appendix E <br /> I <br /> i <br /> IAdvanced GeoEnvironmental,inc <br />