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r <br /> 07 December 2004 I <br /> AGE-NC Project No 98-0448 <br /> Page 7 of 9 a <br /> 1 ` <br /> Analytical results of SVE air flow samples are summanzed in Table 5 The laboratory reports(Cal- <br /> Tech Environmental Laboratones I D 0407-158,0409-003 and 0409-156),QA/QC reports and chain <br /> of custody forms are presented in Appendix D A plot of influent TPH-g SVE air flow concentrations <br />' 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 /> 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 22 June 2004 and 23 September 2004, the SVE unit operated for approximately 1,800 <br /> p p PP Y <br /> hours The average of analytical results between SVE air flow sampling events (Table 6), average <br />�. SVE air flow rates, (Table 7) and the operational period were used to calculate the approximate <br /> volume and mass of extracted gasoline during these periods <br /> During the above air monitoring events, the mass of hydrocarbons extracted from the SVE system <br /> was calculated to be approximately 71 pounds, or equivalent to an approximate volume of <br /> 10 8 gallons of gasoline extracted A plot of the cumulative volume'(gallons) of hydrocarbons <br /> extracted to date is in Appendix E Added to the estimated 270 61 gallons of hydrocarbons extracted <br /> from the SVE system since 16 April 2001, the total volume of hydrocarbons extracted to date is <br />' estimated at 281 41 gallons The mass/volume calculations for extracted hydrocarbons are included <br /> with Appendix F <br /> 5 0. DISCUSSION AND CONCLUSIONS <br />' The implications from the September 2004 ground water monitoring events are as follows <br /> • The September 2004 ground water elevations at the site ranged between 11 11 feet(MW-7) <br />' and 13 46 feet (MW-8)below MSL The ground water elevation at the site was within the <br /> screened intervals of wells MW-1 through MW-8 should be representative of shallow ground <br /> water conditions,however well MW-4B is"drowned"with water approximately 22 feet over <br />' the screen and yields a sample more representative of deeper ground water conditions <br /> • (Table 2) <br /> Advanced GeoEnviron mental,Inc <br /> r <br /> I , <br />