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' 24 August 2001 <br /> AGE-NC Project No 98-0448 <br />' Page 5 of 7 <br /> 4 4 ANALYTICAL RESULTS OF SOIL-GAS VAPOR SAMPLES <br />' VE d 25 June <br /> S air flow samples were collected on 16 April, 27 April, 07 May, 14 May, 06 June an <br />' 2001 TPH-g was detected from all Influent SVE air flow samples at concentrations as high as <br /> 14,000,ug/l,TPH-g was detected from the 16 April and 27 April 2001 effluent SVE air flow samples <br /> at concentrations of 86 and 1,650 4g/l, respectively <br />' BTEX compounds were detected in all Influent SVE air flow samples at concentrations as high as <br /> 330 4g/1 (toluene, 16 April 2001) Benzene was detected in all Influent SVE air flow samples at <br />' concentrations as high as 50 ,ug/l Analytical results of SVE air flow samples are summarized in <br /> Table 4 The laboratory reports (McCampbell Analytical Laboratory I D Nos 65629-30, 67487, <br /> 69218-19 and 70870-71, Precision Enviro-Tech Analytical Laboratory I D Nos PEI 1464 and <br />' PEI 1589) and chain-of-custody forms are presented in Appendix D A plot of laboratory analysis <br /> influent TPH-g SVE air flow concentrations versus time is in Appendix E <br />' 4 5 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 /> fwhere 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 16 April 2001 (start-up) and 30 June 2001 (second quarter 2001), the SVE unit operated <br /> a total of 1,704 hours (Table 5) The average of analytical results between SVE air flow sampling <br /> events (Table 4), average SVE air flow rates, (Table 5) and the operational period were used to <br /> calculate the approximate volume and mass of extracted gasoline during these periods <br /> During the second quarter 2001; the mass of hydrocarbons"extracted-from the SVE system was <br />' calculated to be approximately 677 65 pounds,or equivalent to a volume of 108 4 gallons of gasoline <br /> extracted The mass/volume calculations for extracted hydrocarbons are included with Appendix F <br /> A plot of the cumulative volume (gallons) of hydrocarbons extracted to date is in Appendix E <br /> 1 , <br /> Advanced Geo C'nvironmental,Inc <br />