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12 July 2012 <br />AGE-NC Project No. 02-0926 <br />Page 5 of 7 <br />C = vapor concentration (kg/m') <br />Q = extraction flow rate (m3/hr) <br />t = operational period, in hours <br />Between 16 March and 16 May 2012, the SVE unit operated a total of 1,349 hours <br />(approximately 56 days; Table 2). The average analytical results of the influent SVE <br />samples, average influent flow rates and the operational period were used to calculate the <br />approximate mass of extracted total petroleum hydrocarbons during this period. <br />During the extended pilot test period, the mass of hydrocarbons extracted by the SVE <br />system was calculated to be 1,045.7 pounds (18 lbs per day), or equivalent to a volume <br />of approximately 167 gallons of gasoline. Volume/mass calculations of extracted <br />hydrocarbons are included as Appendix E. <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 April and May 2012 sampling events are as follows: <br />IAS Pilot Test Ground Water Sampling: 10 April 2012 <br />TPH-g were detected at a concentration of 1,200,000 pg/I. <br />BTEX compounds were detected at concentrations of 2,000 pg/I benzene, <br />3,900 pg/I toluene, 340 pg/I ethylbenzene, and 9,500 pg/I, respectively. <br />TAME, 1,2-DCA and EDB were detected at concentrations of 9.1 pg/I and 250 pg/I <br />and 430 pg/I, respectively. <br />IAS Pilot Test Ground Water Sampling: 16 May 2012 <br />TPH-g were detected at a concentration of 120,000 pg/I; <br />BTEX compounds were detected at concentrations of 3,800 pg/I benzene, <br />9,200 pg/I toluene, 1,000 pg/I ethylbenzene, and 12,800 pg/I, respectively. <br />TAME, 1,2-DCA and EDB were detected at concentrations of 16 pg/I and 240 pg/I <br />and 310 pg/I, respectively. <br />No additional analytes were reported at or above laboratory detection limits in the ground <br />water samples analyzed during the March through May 2012 IAS pilot test. Analytical <br />results are summarized in Table 6. The laboratory reports (Cal Tech Environmental <br />Advanced GeoEnvironmental, Inc.