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• Table 4 Summary of Soil Vapor Eatraetion and 1 reatmnt System Data,ARCO Station 434, Lodi, California ~ <br /> Start-up date 613191 <br /> Sample Average flow Days in Down days Percent Influent conccntrauon, p my(a) Removal rate lbs/day N,.t removal, lhs& gallons <br /> date Period rate,elm period i❑period o rational TPII B TPH B 11-111 G !i <br /> Totals and averages <br /> for reporting period 12/7193 3/8/94 77 91 8 91% 137 0 4 0 290 lbs 0 !bs <br /> 47 gals 0 g ils <br /> Totals and averages 6/3/91-3/8/94 100 1009 58 94% 1655 8 63 0 49270 lbs 79 lbs <br /> cumulative 7947 gals 13 gals <br /> Sainplc calculations <br /> Removal rate calculation <br /> lbs/day=("x pg/L)*(gr im/l 000 000µg) * (lb/453 6 grim)*("y cubic fi Wmin)*(1440 min/day) * (28 31 I_AUbic 1"t) <br /> where x"is influent concentration and'y is average flow rate din <br /> For pounds cumulative removal we used the removal lb/day result and multiplied it by the difference in the number of days between the current and previous sampling ave.nt <br /> Gallons removal calculation(for TPH) <br /> gallons removed=lbs *gallon/6 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 />