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26 October 2011 <br />AGE-NC Project No. 02-0926 <br />Page 3 of 4 <br />2.3.2. Analytical Results of Vapor Samples <br />Influent SVE soil vapor and effluent vapor samples were collected on 11 July and 09 <br />August 2011. TPH-g were reported in both influent soil vapor samples at concentrations <br />of 200 micrograms per liter (pg/I). <br />BTEX constituent, total xylenes, were reported in both samples at concentrations of <br />7.1 pg/I and 6.7 pg/I, respectively. <br />No other constituents of concern were reported at or above detection limits in the above <br />influent or effluent SVE air flow samples. Analytical results of SVE samples are <br />summarized in Table 2. Laboratory reports (CTEL Project Nos. -1107062 and -1108076) <br />and chain of custody forms are presented in Appendix B. GeoTracker confirmation <br />numbers 4858384490 and 7565102994 reference the upload of submitted laboratory <br />electronic deliverable format (EDF) files. <br />2.3.3. Mass/Volume Calculations Of Recovered Petroleum Hydrocarbon Vapor <br />The hydrocarbon mass removed during the SVE operating period was calculated using the <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 06 June and 09 August 2011, the SVE units operated a total of 1,532 hours <br />(Table 3). The average analytical results of the influent SVE samples, average influent flow <br />rates and the operational period were used to calculate the approximate mass of extracted <br />total petroleum hydrocarbons during this period. <br />During the third quarter 2011 operational period, the mass of hydrocarbons extracted by <br />the SVE system was calculated to be 93.7 pounds, or equivalent to a volume of <br />approximately 15 gallons of gasoline. Volume/mass calculations of extracted hydrocarbons <br />are included as Appendix C. <br />Advanced GeoEnvironmental, Inc.