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I17 May 2006 <br /> • AGE-NC Project No 03-1071 <br />' Page 4 of 5 <br />' 2 4 1 Mass Calculation of Recovered Products <br /> The SVE hydrocarbon mass removed during the SVE pilot test operating period was calculated using <br />' the 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 />' On 12 April 2006, an SVE pilot test was operational for 8 hours The average analytical results <br /> (10,360µg/1)of the influent SVE air flow samples(Table 2),average flow rates(approximately 37 5 <br />' cfm, Table 6) and the operational period (8 hours) were used to calculate the approximate mass of <br /> extracted gasoline during this period <br />' During the operational period, the combined mass of SVE hydrocarbons extracted by SVE <br /> operations was calculated to be approximately 11 64 pounds, or equivalent to a volume of <br /> approximately 1 9 gallons of gasoline The volume/mass calculations for extracted hydrocarbons are <br />'. included with Appendix D <br />' 3.0. SUMMARY <br /> An 8-hour SVE pilot test was performed at the site on 12 April 2006,the SVE pilot test was <br />' conducted by applying a vacuum at SVE well VW 1 (screened between 30 and 50 feet bsg), <br /> and collecting induced vacuum measurements from observation wells VW-2 through VW-4 <br />' and MW-1 through MW-4 <br /> - From the inlet of the SVE vacuum blower, the SVE flow rate was measured to be between <br /> 33 SCFM and 40 SCFM, the OV readings were consistently observed to be greater than <br />' 10,000 parts per million(ppm), the induced SVE vacuum extracted from well VW-1 was a <br /> constant 60 inches of water,although the initial SVE vacuum measurement was observed at <br /> 68 inches of water (Table 1) <br /> 1 - The greatest induced vacuum was observed from adjacent well MW-3 as high as 1 15 inches <br /> of water, significant induced vacuum was observed from wells VW-2, VW-3, MW-1 and <br />' MW-2 at vacuum measurements ranging between 0 50 and 0 90 inches of water, a lesser <br /> induced vacuum measurements was observed from well VW-4 at measurements ranging <br /> between 0 15 and 0 20 inches of water <br />' - TPH-g was detected in the Influent soil-vapor samples at concentrations as high as <br /> 12,000µg/1,benzene,toluene,ethylbenzene and total xylenes were detected in the soil-vapor <br />' Advanced GeoEnv►ronmental,Inc <br />