Laserfiche WebLink
1 <br />' 25 November 2002- <br /> AGE-NC Project No 98-0448 <br />' Page 5 of 8 <br />' 4 3 RESULTS OF VAPOR EXTRACTION <br /> Between 11 June 2002 and 11 September 2002, the SVE and LAS remediation systems were <br />' continuously operational for 2,208 hours, the SVE and LAS systems have totaled 12,568 hours of <br /> operation since initiation on 16 April 2001 (Table 7) During the June, July, August and September <br /> 2002 operational period,SVE inlet flow rates ranged between 36 and 55 cubic feet per minute(c$n), <br />' differential pressures ranged between 0 40 and 125 inches of water, and induced vacuum as great <br /> as 72 inches of water Utilizing a photo ionization meter (PID), SVE inlet hydrocarbon <br /> concentrations were measured between 0 and 450 parts per million (ppm), however a general <br /> concentration trend was not established from the PID field measurements Field measurements are <br /> summarized in Table 6 <br /> I <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' SVE air flow samples were collected on 17 July, 20 August and 11 September 2002 TPH-g was <br /> detected from all influent SVE air flow samples at concentrations as high as 1,100 ugll (17 July <br /> 1. 2002) TPH-g was detected in the August and September 2002 effluent SVE air flow samples at <br /> concentrations as high as 59µg/1 <br /> I BTEX compounds were detected in all influent SVE air flow samples at concentrations as high as <br /> 21 #g/1(xylene, 17 July 2002) Benzene was detected in the July and August 2002 influent SVE air <br /> flow samples at concentrations as high as 4 4µg/1 Analytical results of SVE air flow samples are <br />' summarized in Table 5 The laboratory reports (McCampbell Analytical Laboratory Work Order <br /> 0208347, 0207238 and 0209183) and cham-of-custody forms are presented in Appendix D A plot <br /> of influent TPH-g SVE air flow concentrations versus time is in Appendix,E <br /> I <br /> I45 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 Pas s recovered (kg) <br /> C =vapor concentration (kg/m3) <br /> I <br /> Q = extraction flow rate (M3/hr) <br />' t= operational period, in hours <br /> • <br /> Advanced GeoEnvironmental,Inc <br />