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25 January 2012 <br />AGE-NC Project No. 02-0926 <br />Page 4 of 7 <br />constituents were reported in influent vapor samples at maximum concentrations of 35 pg/I <br />benzene, 40 pg/I toluene, 10 pg/I ethylbenzene, and 44 pg/I total xylenes (sample collected <br />20 December 2011; Table 4). <br />Analytical results of soil vapor samples are summarized in Table 4. The laboratory reports <br />(CTEL Project Nos. 1112134, 1112137, 1112152, 1112160 ), QA/QC reports, and chain <br />of custody forms are included in Appendix B. Laboratory EDF files were uploaded to the <br />State GeoTracker database under confirmation number 9327646911, 9966840386, <br />3871871232 and 7441853344. <br />4.3. MASS/VOLUME CALCULATIONS OF RECOVERED PETROLEUM <br />HYDROCARBON VAPOR <br />The hydrocarbon mass removed during the SVE operating period was calculated using the <br />equation: M = C.Q.4 <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 19 December and 22 December 2011, the SVE unit operated a total of 72 hours <br />(Table 2). 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 72-hour IAS pilot testing period, the mass of hydrocarbons extracted by the SVE <br />system was calculated to be :18.3 pounds, or equivalent to a volume of approximately <br />3 gallons of gasoline. Volume/mass calculations of extracted hydrocarbons are included <br />as Appendix D. <br />4.4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />Hydrocarbon-impact to ground water was quantified by laboratory analysis of ground water <br />samples. Findings at the time of the December 2011 sampling events are as follows: <br />Background Ground Water Sampling: 19 December 2011 <br />TPH-g were detected at a concentration of 94,000 micrograms per liter pg/I. <br />4dvanced GeoEnvironmental, Inc.