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ATC Associates Inc <br /> 1117 Lone Palm Avenue, Suite B <br /> (: <br /> Modesto, California 95351 V9%TC <br /> 209-579-2221 <br /> ASS O C I ATE S INC <br /> fax 209-579-2225 <br /> blower for the extraction of vapor during several events Three carbon camsters in series were <br /> utilized to treat the oft gas during the remedial events prior to venting to the atmosphere Vapor <br /> tanalytical results are summarized in Table 4, and laboratory data sheets are presented in Appendix <br /> C <br /> ' 442 High Vacuum Dual Phase Extraction Results <br /> ' Vapor analytical results indicate the TPHg and BTEX were detected in each of the influent vapor <br /> samples collected with the exception of the sample collect on March 16, 2005 (this sample was <br /> possibly switched inadvertently with the effluent sample from March 18, 2005) MTBE was <br /> ' detected in all the vapor samples collected during the November-December and January events <br /> MTBE was not detected during the initial remediation event and decreased to very low or <br /> nondetectables levels during the last three remediation events The highest concentrations of <br /> ' BTEX and MTBE were detected during the January event and appeared to have stabilized at <br /> lower concentrations during the last three events <br /> Vapor analytical results from samples collected during the remediation events performed from <br /> October 2004 to April 2005 are summarized in Table 4 Copies of field notes are contained in <br /> Appendix A <br /> Calculations <br /> The results of the analytical tests on the vapor samples are presented in Table 4 in parts per <br /> zillion by volume (ppmv), which is the ratio of a target analyte concentration with respect to a <br /> volume of medium being sampled, generally expressed in terms of the medium being sampled In <br /> ithis case, the sample medium is air vapor Therefore, an analytical result of 1 ppmv TPHg (for <br /> example) would be equivalent to I part TPHg vapor per 1 million parts air vapor The mass <br /> ' removed by vapor extraction was determined by the following calculation <br /> #Liters analvte x #3 x 60 min x 28 32 1 air x 1 mole analyte x #g x 1 Ib <br /> 10`6 Liters air min 1 hour 1 ft" 24 5 liters vapor mole analyte 454 g <br /> - #lbs analyte - Total number of pounds of analyte removed dunng the vapor extraction <br /> Hour test <br /> ' The following table summarized the dates by which the vapor extraction system operated, the <br /> total hours operated, and the calculated mass removed during the dates by which the vapor <br /> extraction system operated Mass calculations associated with the remediation events are <br /> provided in more detail m Table b <br /> s lenvwomer"\62577—Diesel Perfirep Vrdenm_rem.dw 4 <br />