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' 29 September 2000 <br /> AGE-NC Project No 95-0173 <br /> Page 5 of 7 <br />' 3 3 RESULTS OF VAPOR EXTRACTION <br /> Between 03 April 2000 and 30 June 2000, the SVE and IAS remediation systems were operational <br /> I for 1,220 hours (Table 4) During the operational period, SVE inlet flow rates ranged from 110 to <br /> 160 standard cubic feet per minute(scfm) at differential pressures between 4 0 to 7 5 inches of water, <br /> the induced vacuum stabilized at approximately 4 inches of water after approximately 500 hours of <br />' operation Hydrocarbon concentrations were measured at regular intervals at the SVE Inlet, however <br /> no general trends were established from the PID field measurements Field measurements are <br /> summarized In Table 4 <br /> 34 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' Soil-gas vapor samples were collected on 11 April 2000, on 18 May 2000 and on 07 June 2000 <br /> TPH-g was detected In soil-gas vapor samples collected from the SVE Inlet at concentrations as high <br />' as 2,800µg/1 and from the outlet at concentrations as high as 170 ,Ag/1 <br /> BTEX compounds were detected In soil-gas vapor samples collected from the SVE Inlet at <br />'. concentrations as high as 150,ug/1 Benzene concentrations were detected as high as 4 9,ug/1 BTEX <br /> compounds were detected in soil-gas vapor samples collected from the SVE outlet at concentrations <br />' as high as 11 µg/1 Analytical results of soil-gas vapor samples are summarized In Table 3 The <br /> laboratory reports (McCampbell Analytical Laboratory I D 's 34957, 34958, 38386, 38387, 39843 <br /> and 39844) and chain-of-custody forms are presented In Appendix D <br /> I <br /> 3 5 MASS CALCULATION OF RECOVERED PRODUCT <br /> IThe 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 /> t = operational period, In hours <br />' Between 03 April 2000 and 30 June 2000, the extraction unit operated a total of 1,220 hours The <br /> average from the analytical results (approximately 2,200 kzg/l) of the vapor samples combined with <br /> average flow rates (approximately 125 cfm) and the operational period were used to calculate the <br /> approximate mass of extracted gasoline during these periods <br /> i <br />' Advanced GeoEnvironmental,Inc <br />