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s <br /> ATC Associates Inc <br /> (: <br /> VYA <br /> 1117 Lone Palm Avenue, Suite B <br /> Modesto,California 95351 <br /> 209-579-2221 TC <br />' A S S O C I A T E S I N C Fax 209-579-2225 <br /> laboratory analytical data are summarized in Table 3 and laboratory data are included in Attachment <br /> 4 <br />' Soil Vapor Extraction System Evaluation <br /> Since startup of the soli vapor extraction system on September 6, 2005, the system has been <br />' operational for 2,326 40 hours as of June 16, 2006 From March 16, 2006 to June 16, 2006, the <br /> system was operational for 1,001 10 hours During the second quarter of 2006, the average extracted <br /> vapor flow rate was 188 cubic feet per minute(cfrn) and the average influent vacuum achieved by the <br />' electric catalytic oxidizer was approximately 54 02 inches of water <br /> Tp$g <br /> Assuming an average influent flow rate of 188 cfm and average influent TPHg concentration of <br /> 550 ppmv, the total mass of TPHg removed from the system between March 16, 2006 and June 16, <br /> 2006 is 1,364 42 pounds <br />' Benzene <br /> Using the average influent flow rate of 188 cfrn and average influent benzene concentration of <br /> 0 72 ppmv, the total mass of benzene removed from the system between March 16, 2006 and June <br /> 16, 2006 is 162 pounds <br />' Toluene <br /> Using the average influent flow rate of 188 cfm and average influent toluene concentration of 5 73 <br /> ppmv, the total mass of toluene removed from the system between March 16, 2006 and June 16, <br /> 2006 is 15 18 pounds <br />' Ethvlbenzene <br /> Using the average influent flow rate of 188 cfm and average influent ethylbenzene concentration <br /> of 2 43 ppmv, the total mass of ethylbenzene removed from the system between March 16, 2006 <br /> and June 16, 2006 is 7 42 pounds <br /> Total&Ienes <br />' Using the average influent flow rate of 188 cfm and average influent xylenes concentration of <br /> 26 03 ppmv, the total mass of xylenes removed from the system between March 16, 2006 and June <br /> 16, 2006 is 79 46 pounds <br /> Calculations for contaminants extracted from soil are summarized in Table 4 <br />' 8162588103*aAerl}\2-rid qtr-2006 doc 6 <br />