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k <br /> t22 April 2002 <br /> AGE-NC Project No 98-0448 <br />' Page 5 of 8 <br /> and 4 The laboratory reports (McCampbell Analytical Inc I D 82817 through 82821) and <br />' chain-of-custody forms are presented in Appendix C <br />' '43 RESULTS OF VAPOR EXTRACTION <br />' Between 01 October 2001 and 31 September 2001, the SVE and IAS remediation systems were <br /> operational for 1,584 hours (Table 6) During the operational period, SVE inlet flow rates ranged <br /> from 28 to 39 cubic feet per minute (cfm), differential pressures ranged between 0 25 and 0 50 <br />' inches ofwater,and induced vacuum between 63 and 68 inches of water Utilizing a photo ionization <br /> meter (PID), hydrocarbon concentrations were measured between 0 5 and 238 parts per million <br /> (ppm) at regular intervals at the SVE inlet, however a general concentration trend was not <br />' established from the PID field measurements Field measurements are summarized in Table 5 <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> SVE air flow samples were collected on 15 October,07 November and 13 December 2001 TPH-g <br /> lie <br /> was detected from all influent SVE air flow samples at concentrations as high as 520µg/1 TPH-g <br /> was detected in the 15 October 2001 effluent SVE air flow sample at a concentration of 72µg/1,but <br />' was not detected in effluent samples collected in November and December 2001 <br /> BTEX compounds were detected in all influent SVE air flow samples at concentrations as high as <br />' 69 pg/1 (xylene, 15 October 2001) Benzene was only detected in the October 2001 influent and <br /> effluent SVE air flow samples at concentrations of 0 81 pg/l and 13 µg/1, respectively Analytical <br /> results of SVE air flow samples are summarized in Table 5 The laboratory reports (McCampbell <br /> Analytical Laboratory I D Nos 80941-42, 83115-16 and 86509-10 and chain-of-custody forms are <br />' presented in Appendix D A plot of influent TPH-g SVE air flow concentrations versus time is In <br /> Appendix E <br /> 1 <br /> -45 MASS CALCULATION OF RECOVERED PRODUCT - - <br /> 1 The hydrocarbon mass removed during the SVE operating period was calculated using the following <br /> equation M = C-Q.t <br />' - where M —cumulative mass recovered (kg) <br /> C = vapor concentration (kg/m3) <br /> Advanced GeoEnvironmental,Inc <br /> 1 � <br />