Laserfiche WebLink
15 November 2002 <br /> AGE-NC Project No. 95-0173 <br /> Page 5 of 8 <br /> 4.3. RESULTS OF SOIL VAPOR EXTRACTION <br /> Between 11 June 2002 and 26 September 2002, the SVE and IAS remediation systems were <br /> operational for approximately 2,118 hours(Table 6).During the operational period, SVE inlet flow <br /> rates were calculated to be approximately 98 cubic feet per minute; differential pressures were <br /> �. observed at approximately 3.2 inches of water; and induced vacuum between 29 and 35 inches of <br /> water. Utilizing a photo ionization meter (PID), hydrocarbon concentrations were measured at <br /> concentrations as high as 562 parts per million (ppm) at regular intervals at the SVE inlet. Field <br /> measurements are summarized in Table 6. <br /> 4.4. ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br /> Influent and Effluent SVE air flow samples were collected on 11 June, 17 July, 19 August and <br /> 26 September 2002. TPH-g was detected in all four influent SVE air flow samples at concentrations <br /> as high as 950 gg/l; TPH-g was detected in the 26 September 2002 effluent SVE air flow sample at <br /> i- a concentration of 66 µg/1. <br /> w BTEX compounds were detected in all four influent SVE air flow samples at concentrations as high <br /> `' as 62 µg/l(xylenes,26 September 2002); the maximum benzene concentration was detected in the <br /> 26 September 2002 influent sample at a concentration of 1.9 gg/l.Toluene and xylenes were detected <br /> in the effluent SVE air flow samples at concentrations as high as 2.9 gg/I toluene. <br /> Analytical results of SVE air flow samples are summarized in Table 5. The laboratory reports <br /> (McCampbell Analytical Laboratory I.D. Nos. 0207239, 0208327 and 0209452) and chain-of- <br /> custody forms are presented in Appendix D. A plot of laboratory analysis of SVE influent TPH-g <br /> air flow concentrations versus time is included with Appendix E. <br /> 4.5. 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/m3) <br /> Q = extraction flow rate (M3/hr) <br /> t=operational period, in hours <br /> Advanced GcoEnvironmental,Inc. <br />