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02 November 2001 <br /> AGE-NC Project No 95-0173 <br /> Page 5 of 8 <br /> (Castle Analytical Laboratory Reference No 3849) and chain-of-custody forms are presented in <br /> Appendix C <br /> 43 RESULTS OF VAPOR EXTRACTION <br /> Between 01 April 2001 and 30 June 2001, the SVE and IAS remediation systems were operational <br /> for 1,836 hours(Table 5) During the operational period, SVE inlet flow rates ranged from 86 to 110 <br /> cubic feet per minute (efni), differential pressures ranged between 2 6 and 4 0 inches of water, and <br /> induced vacuum between 25 and 43 inches of water Utilizing a photo ionization meter (PID), <br /> hydrocarbon concentrations were measured between 45 and 282 parts per million (ppm) at regular <br /> intervals at the SVE inlet Field measurements are summarized in Table 5 <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> SVE air flow samples were collected on 12 April, 21 May, 06 June and 26 June 2001 TPH-g was <br /> detected in all foui influent SVE air flow samples at concentrations as high as 1,860 gg/l, TPH-g was <br /> detected from the 06 June and 26 June 2001 effluent SVE air flow samples at concentrations of 82 <br /> lie ,ug/1 and 52 �tg/l, i espectively <br /> BTEX compounds were detected in all four influent SVE air flow samples at concentrations as high <br /> as 183 ,ug/1 (xylenes, 21 May 2001) Benzene was not detected in any air flow samples collected <br /> during the second quarter 2001 Analytical results of SVE air flow samples are summarized in Table <br /> 4 The laboratory repoits (McCampbell Analytical Laboratory I D Nos 65412-13, 69216-17 and <br /> 71060-61 and Precision Envito-Tech Analytical Laboratory Sample I D PE11764) and chain-of- <br /> custody forms are presented in Appendix D A plot of laboratory analysis influent TPH-g SVE air <br /> flow concentrations versus time is included with Appendix E <br /> 45 MASS CALCULATION OF RECOVERED PRODUCT <br /> The hydrocarbon mass removed during the SVE operating period was calculated using the following <br /> eaiiation M = C'•Q•t <br /> where M — cumulative mass recovered (kg) <br /> C =vapor concentration (kg/m') <br /> Q = extraction flow rate (m3/hr) <br /> t = operational period, in hours <br /> MBetween 01 April 2001 and 30 June 2001 (second quarter 2001), the SVE unit operated a total of <br /> Advanced GeoEnvironmental,Inc <br /> I <br />