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Table 4. Summary of Groundwater Extraction System Data, ARCO Station 2133, Stockton, California <br /> Start-up date 4/18/9I <br /> Date Total volume, Average Effluent concentration, I Net removal,lbs&gallons <br /> sampled Period extracted,gallons flowrate,gpm TPH-G B TPH-G B <br /> Totals and averages 6/12/95-9/19/95 333,215 23 753 35 2 I lbs 0 l lbs <br /> for reporting period 03 gals 00 gals <br /> Totals and averages 4/18/91-9/19/95 11,538,505 52 735 56 61 0 lbs 50 lbs <br /> cumulative 98 gals 07 gals <br /> Sample calculations <br /> Removal rate calculation <br /> lbs removed-("x"gg/L)*(gram/1,000,000µg)*(Ib/454 grams)*(3 78 Ugal)*(gallons pumped) <br /> where"x"is influent concentration <br /> To calculate pounds removal for a reporting period if several sampling events occurred in one period,we used the effluent concentrations <br /> that had the highest TPH value <br /> Gallons removal calculation(for TPH) <br /> gallons removed—lbs*gallon/6 2 lbs(density for TPH-G is 6 2) <br />