Laserfiche WebLink
08 June 2003 <br /> AGE-NC Project No 98-0448 <br /> Page 6 of 9 <br /> 44 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br /> SVE air flow samples were collected on 17 December 2002 and on 27 January, on 26 February and <br /> on 20 March 2003 TPH-g was detected from all influent SVE air flow samples at concentrations as <br /> high as 400,ug/1 (December 2002) <br /> BTE&X compounds were detected in all the above influent SVE air flow samples at concentrations <br /> as high as 4 8 pg/1(xylenes,December 2002) Benzene was not detected in any of the above influent <br /> SVE air flow samples Analytical results of SVE air flow samples are summarized in Table 5 The <br /> laboratory reports (McCampbell Analytical Laboratory Work Order Nos 0301344, 0302376 and <br /> 0303367) and chain-of-custody forms are presented in Appendix D A plot of influent TPH-g SVE <br /> air flow concentrations versus time is in Appendix E <br /> I <br /> 45 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/m') <br /> Q = extraction flow rate (M3/hr) <br /> t= operational period, in hours <br /> Between 17 December 2002 and 20 March 2003,the SVE unit continuously operated approximately <br /> 1,992 hours The average of analytical results between SVE air flow sampling events (Table 5), <br /> average, SVE air flow rates (Table 6) and the operational period were used to calculate the <br /> approximate volume and mass of extracted gasoline during these periods <br /> I During the above air monitoring events, the mass of hydrocarbons extracted from the SVE system <br /> was calculated to be approximately 33 29 pounds, or equivalent to an approximate volume of 5 33 <br /> gallons of gasoline extracted A plot of the cumulative volume(gallons)of hydrocarbons extracted <br /> Ito date is in Appendix E Added to the estimated 226 22 gallons of hydrocarbons extracted from the <br /> SVE system since 16 April 2001,the total volume of hydrocarbons extracted to date is estimated at <br /> 229 98 gallons The mass/volume calculations for extracted hydrocarbons are included with <br /> Appendix F <br /> IAdvanced GeoEnvironmental,Inc <br /> I <br />