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I <br />' 04 January 2002 <br /> AGE-NC Project No 95-0173 <br />' Page 5 of 8 <br /> 4 3 RESULTS OF SOIL VAPOR EXTRACTION <br />' Between 01 July p 2001 and 30 September 2001 the SVE and IAS remediation systems were <br /> operational for 2,158 hours (Table 5) During the operational period, SVE inlet flow rates ranged <br /> from 100 to 115 cubic feet per minute (cfrn), differential pressures ranged between 4 0 and 4 2 <br /> inches of water, and induced vacuum between 36 and 39 inches of water Utilizing a photo ionization <br />' <br /> meter(PID),hydrocarbon concentrations were measured between 83 and 219 parts per million(ppm) <br /> at regular Intervals at the SVE inlet Field measurements are summarized in Table 5 <br />' 4 4 ANALYTICAL RESULTS OF VAPOR EXTRACTION AIR FLOW SAMPLES <br />' SVE air flow samples were collected on 11 July, 09 August, 13 September 2001 TPH-g was <br /> detected in all three influent SVE air flow samples at concentrations as high as 1,500 ,ug/l, TPH-g <br /> was not detected In any effluent SVE air flow samples <br /> BTEX compounds were detected in all three influent SVE air flow samples at concentrations as high <br /> • as 170�ig/1 (xylenes, 13 September 2001) Benzene was only detected in the 13 September 2001 air <br /> flow sample at a concentration of 1 4 ,ug/1 Analytical results of SVE air flow samples are <br /> summarized in Table 4 The laboratory reports(McCampbell Analytical Laboratory I D Nos 72270- <br /> 71, 74509-10 and 77940-41) and chain-of-custody forms are presented in Appendix D A plot of <br />' laboratory analysis influent TPH-g SVE air flow concentrations versus time is included with <br /> Appendix E <br />' <br /> 45 MASS CALCULATION OF RECOVERED PRODUCT <br />' The hydrocarbon mass removed during the SVE operating period was calculated using the equation <br /> M= C•Q•t <br /> rwhere 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 01 July 2001 and 30 September 2001 (third quarter 2001), the SVE unit operated a total <br /> of 2,158 hours (Table 5) The average analytical results (approximately 1,143 /.ig/1) of the SVE air <br /> flow samples (Table 3), average flow rates (approximately 115 cfin, Table 5) and the operational <br /> period(2,158 hours) were used to calculate the approximate mass of extracted gasoline during this <br /> period <br />' Advanced Geo Environmental,Inc <br />