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0 ! 0 __ . <br /> Table 4 Summary of Soil Vapor Extraction and Treatment System Data,ARCO Station 434, Lodi, California <br /> Start-up date 613191 <br /> Sample Average flow Days in Down days Percent Influent concentration, ppmv(a) Removal rate,lbs/day Net removal,lbs Xi gallons <br /> date Period rate,ctm period in period o rational 'I-PH B TPH B 11,11 G B <br /> 512194 4/12194-512/94 61 20 0 100% 280 <0 016 6 0 128 lbs 0 Ihs <br /> 617194 512194-6/27194 62 56 0 100% 110 <0016 3 0 143 lbs 0 lbs <br /> Totals and averages <br /> for reporting period 3/8/94-6127194 64 111 3 97% 223 <0 016 5 0 498 lbs 0 lbs <br /> 80 gals 0 gals <br /> Totals and averages 6/3191-6/27/94 98 1120 61 9590 1551 8 59 0 6421 lbs 79 lbs <br /> cumulative 1036 gals 13 gals <br /> Sample calculations <br /> Removal rate calculation <br /> lbs/day=("x"jig/L)*(gram/1,000,000 pg)*(lb/453 6 gram)*( y"cubic feet/min)*(1440 miniday)*(28 31 Ucubic feet} <br /> where"x"is influent concentration and"y"is average flow rate,elm <br /> For pounds cumulative removal we used the removal lb/day result and multiphed it by the difference in the number of days between the current and previous sampling event <br /> Gallons removal calculation(for TPH) <br /> gallons removed=lbs*gallon16 2 lbs <br /> (a)From start-up through June 1992 influent samples were not taken because there was no sample tap on the inlet to the catalytic oxidizer <br /> Therefore,the influent concentrations(in parts per million by volume)are an estimate <br />