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' 10 December 2001 <br /> AGE-NC Project No 98-0448 <br />' Page 5 of 8 <br />' and 3 The laboratory reports (McCampbell Analytical Inc I D 73509 through 73514) and chain-of- <br /> custody forms are presented in Appendix C <br /> 1 43 RESULTS OF VAPOR EXTRACTION <br />' Between 01 July 2001 and 13 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 (cfrn), differential pressures ranged between 0 25 and 0 50 <br /> inches of water, 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 /> 4 4 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> SVE air flow samples were collected on 11 July, 09 August and 13 September 2001 TPH-g was <br />' detected from all influent SVE air flow samples at concentrations as high as 1,300 ,ug/l TPH-g was <br /> detected in the 11 July 2001 effluent SVE air flow sample at a concentration of 270 ktg/l, but was <br /> not detected in effluent samples collected in August and September 2001 <br /> BTEX compounds were detected in all Influent SVE air flow samples at concentrations as high as <br /> 150 4g/1 (xylene, 11 July 2001) Benzene was detected in all influent SVE air flow samples at <br /> concentrations as high as 3 2 ,ug/1 Analytical results of SVE air flow samples are summarized in <br /> Table 4 The laboratory reports (McCampbell Analytical Laboratory I D Nos 72272-73, 74511-12 <br />' and 77938-39 and chain-of-custody forms are presented in Appendix D A plot of influent TPH-g <br /> SVE air flow concentrations versus time is in Appendix-E <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 /> C = vapor concentration (kg/m3) <br /> Q = extraction flow rate (M3/hr) <br /> It =operational period, in hours <br /> Advanced GeaE nvi ron mental,Inc <br /> I <br />