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r <br /> KLEINFELDER <br /> release, which was as deep as 100 feet bgs in the 1970s. The results of the MW-1 sampling <br /> f <br /> following the deep air sparging may indicate evidence of mobilization of deep contamination <br /> into the well. <br /> I 2.4 SOIL,GAS RESULTS AND EVALUATION <br /> In order to estimate the contaminant loading of an SVE system installed at the site, a gas sample <br /> was taken from the pilot SVE well. The results are presented in Table 3. The complete <br /> i <br /> laboratory report is presented in the Appendix A. <br /> Table 3: Soil Gas Concentrations of COCs in the Pilot SVE Well <br /> i <br /> ' r <br /> TPH as Gasoline 96 <br /> Benzene ND 0.016 <br /> Toluene 0.32 <br /> Eth lbenzene ND P,0.022 <br /> Total Xylenes 0.099 <br /> Tert-But 1 Alcohol ND 0.062 <br /> 12-Dichloroethane ND 0.020 <br /> 12-Dibromoethane ND @ 0.039 <br /> 1 <br /> As the results indicate the major loading on the SVE system will be TPH in the gasoline range. <br /> Assuming a source area remediation system operating at a flowrate qQ the mass loading would <br /> be: <br /> Qn =C(qa .c.) <br /> where, <br /> QM =Mass removal rate (lbs/day) <br /> qa = System flowrate(scfm) <br /> C, = Concentration in air stream(ug/1) <br /> C =Conversion factor(9.0e-5 min•l•lb/day-ft3•ug) <br /> Inputting known quantities, and assuming an SVE flowrate of 250 scfm, the total (calculated) <br /> loading would be 9.0e-5(250scfin)(96ug/1)=2.16, or about 2 pounds of TPH per day. <br /> 12280NSAC2R566 Page 7 of 9 November 25,2002 <br /> Copyright 2002 Kleinfelder,Inc. <br />