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I <br />' 20 August 2003 <br /> AGE-NC Project No 95-0173 <br />' Page 6 of 8 <br /> January 2003 influent sample at a concentration of 1 1 µg/l BTEX constituents were not detected <br />' in any of the three effluent SVE air flow samples <br /> Analytical results of SVE air flow samples are summarized in Table 5 The laboratory reports(Castle <br /> Analytical Laboratory I D Nos 5334, 5401 and McCampbell Analytical work order no 0302375) <br /> and chain-of-custody forms are presented in Appendix D A plot of laboratory analysis of SVE <br />' influent TPH-g 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 /> 1 C =vapor concentration (kg/m 3) <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 operated a total of 2,132 hours <br /> (Table 6) The average analytical results (approximately 307 gg/1) of the influent SVE air flow <br /> samples (Table 5), average flow rates(approximately 110 cfm, Table 6) and the operational period <br /> (2,132 hours)were used to calculate the approximate mass of extracted gasoline during this period <br />' During the December 2002 through March 2003 period, the mass of hydrocarbons extracted by the <br /> SVE system was calculated to be approximately 269 pounds,or equivalent to a volume of 43 gallons <br />' of gasoline Added to the estimated 1,548 gallons of hydrocarbons extracted from the SVE system <br /> since I 1 April 2000 (start-up), the total volume of hydrocarbons extracted to date is estimated at <br /> 1,591 gallons(Table 7) A plot of the cumulative volume(gallons)of hydrocarbons extracted to date <br />' is included with Appendix E The mass/volume calculations for extracted hydrocarbons are included <br /> with Appendix F <br /> 5.0 CONCLUSIONS <br /> The implications from the April 2003 ground water monitoring event are as follows <br /> • Ground water flow direction at the site was generally oriented northeast and radially inward <br /> toward a ground water depression located near MW-4 at a gradient of 0 003 ft/ft or less Due <br /> to the generally low gradient at the site, slight variations in ground water measurements or <br /> Advanced CeoEnvironmental,Inc <br />