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r24 May 2005 <br /> i AGE-NC Project No 98-0448 <br />' Page 6 of 9 _ <br />' 43 RESULTS OF VAPOR EXTRACTION <br /> Between 22 December 2004 and 08 March 2005, the SVE and IAS remediation systems were <br />' operational for a total of 1,824 hours(76 days),the SVE and IAS remediation systems have totaled <br /> 32,008 hours of operation since initiation on 16 April 2001 (Table 7) During the above operational <br /> period, SVE inlet flow rates were recorded at between 18 and 32 cubic feet per minute (cfm), <br />' differential pressures were recorded between 0 14 and 0 35 inches of water, and induced vacuum <br /> measurements ranged between 54 and 76 inches of water Utilizing a photo ionization meter(PID), <br /> SVE inlet hydrocarbon concentrations were measured between 4 3 and 68 parts per million(ppm) <br />' Field measurements are summarized in Table 6 <br />' 4 4 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> During the first quarter 2005, SVE air flow samples were collected on 18 January, 16 February and <br />' 08 March 2005 TPH-g was only detected from the January 2005 influent SVE air flow sample at <br /> a concentration of 600 µg/1 <br /> • Total xylenes were detected in the January 2005 influent SVE air flow samples at a concentration <br /> of 2 2 µg/1, toluene and total xylenes were detected in the March 2005 sample at concentrations of <br /> 4 2 µg/1 and 6 5 pg/l, respectively <br /> Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports(Cal <br /> I Tech Environmental Laboratories I D nos 0501-190,0502-104 and 0503-082),QA/QC reports and <br /> 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, GeoTracker confirmation pages of the submitted <br /> laboratory electronic deliverable format (EDF) files are included in Appendix G <br />' 4 5 MASS CALCULATION OF RECOVERED PRODUCT <br /> 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 /> IC =vapor concentration(kg/m3) <br /> Q = extraction flow rate (m3/hr) <br /> t= operational period, in hours <br /> • <br /> Advanced GeoEnvironmental,Inc. <br /> I <br />