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' 26 February 2001 <br /> AGE-NC Project No 95-0173 <br />' Page 5 of 8 <br /> 4 3 RESULTS OF VAPOR EXTRACTION <br /> I <br /> Between 01 October 2000 and 31 December 2000, the SVE and IAS remediation systems were <br /> operational for 2,160 hours (Table 4) During the operational period, SVE Inlet flow rates ranged <br /> from 80 to 117 cubic feet per minute (cfn), differential pressures ranged between 2 5 and 4 2 Inches <br /> of water, and Induced vacuum between 15 and 22 inches of water Utilizing a photoiomzation meter <br />' (PID), hydrocarbon concentrations were measured between 102 and 175 parts per million (ppm) at <br /> regular intervals at the SVE inlet, however a general concentration trend was not established from <br /> the PID field measurements Field measurements are summarized In Table 5 <br /> 4 4 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' Soil-gas vapor samples were collected on 04 October 2000,06 November 2000 and on 21 December <br /> 2000 TPH-g was detected in soil-gas vapor samples collected from the SVE Inlet at concentrations <br />' as high as 1,900,ug/l, however soil-gas vapor samples collected on 06 November 2000 are suspect <br /> due to procedural error in the field <br />' BTEX compounds were detected in soil-gas vapor samples collected from the SVE inlet at <br /> concentrations as high as 86 4g/l (xylenes) Benzene was only detected in the 04 October 2000 Inlet <br /> soil-gas vapor sample at a concentration of 1 2 4gll Analytical results of soil-gas vapor samples are <br />' summarized in Table 4 The laboratory reports (McCampbell Analytical Laboratory I D 's 49724-25, <br /> 52351-52 and 56706-07) and chain-of-custody forms are presented in Appendix D A plot of <br />' laboratory analysis influent TPH-g soil-gas vapor concentrations versus time is Included with <br /> Appendix F <br />' 4 5 MASS CALCULATION OF RECOVERED PRODUCT <br />' The hydrocarbon mass iemoved 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/m') <br /> Q= extraction flow rate (m3/hr) <br /> t=operational period, in hours <br /> Between 01 October 2000 and 31 December 2000 (fourth quarter 2000), the SVE unit operated a <br /> total of 2,160 hours(Table 4) The average analytical results(approximately 1,650 ug1l)of the vapor <br /> • Advanced GeoEnvironmental,Inc <br /> 1 <br /> 1 <br />