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' 31 August 2004 <br /> AGE-NC Project No 95-0173 <br />' Page 7 of 10 <br /> 3 4 1 RESULTS OF SOIL VAPOR EXTRACTION <br /> I <br /> Between 30 December 2003 and 24 March 2004, the SVE remediation system was operational for <br /> approximately 2,040 hours(Tables 6 and 7) The IAS system cycled or operated contemporaneously <br /> with the SVE system During this operational period, SVE inlet flow rates were observed to average <br /> approximately 71 cubic feet per minute, from a differential pressures observed at approximately 2 1 <br /> inches of water, with induced vacuum measurements observed between 55 and 64 inches of water <br />' Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured at <br /> concentrations as high as 317 parts per million (ppm) at regular intervals at the SVE inlet Field <br />' measurements are summarized in Table 6 <br />' 3 4 2 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> Influent and effluent SVE air flow samples were collected on 26 January, on 23 February and on 24 <br /> March 2004 TPH-g was detected in the January and February influent SVE air flow samples at <br /> concentrations of 220 µg/1 and 330 gg/l, respectively TPH-g was also detected in the January 2004 <br /> • effluent air flow sample at a concentration of 42 µg/1 <br />' BTEX constituents were detected in the January influent SVE air flow sample at concentrations of <br /> p <br /> 0 99 µg/1 benzene, 1 6 µg/1 toluene,0 54 µg/1 ethylbenzene and 5 7 µg/1 xylene Low concentrations <br /> of BTEX constituents were detected in the January 2004 effluent SVE air flow sample at <br /> concentrations 0 31 µg/1 benzene, 0 43 µg/1 toluene, 0 12 µg/I ethylbenzene and 0 13 µg/l xylene <br />' Analytical results of SVE air samples are summarized in Table 5 The laboratory reports (CAL <br /> Reference No 6564 and CTEL Laboratory I D No 0402-139 and 0403-188) and chain-of-custody <br />' forms are presented in Appendix D A plot of laboratory analysis of SVE influent TPH-g air stream <br /> concentrations versus time is included with Appendix E GeoTracker confirmation pages of the <br /> submitted laboratory electronic deliverable format (EDF) files are included in Appendix G <br /> 3 4 3 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the equation <br /> M= C•Q•t <br /> where M =cumulative mass recovered (kg) <br /> C =vapor concentration (kg/m') <br /> Q = extraction flow rate (m'/hr) <br /> t= operational period, in hours <br />' Advanced Gcoltnvironmental,Inc <br />