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i • � <br /> Table 4. Summary of Groundwater Extraction System Data, ARCO Station 2133, Stockton, California <br /> Start-up date 4118191 <br /> Date Total volume, Average Efiluent concentration, 1 Net removal,lbs&gallons— <br /> sampled <br /> allonssam led Period extracted,gallons f]owrate,gpm TPH-G B TPH-G B <br /> I <br /> Totals and averages 318195-6112195 465,038 3 1 675 11 1 9 lbs 00 lbs <br /> for reporting period 03 gals 00 gals <br /> Totals and averages 4118191-6112195 11,205,290 54 734 57 589 lbs 49 lbs <br /> cumulative 95 gdls 07 gals <br /> Sample calculations <br /> Removal rate calculation <br /> lbs removed-("x"gg1L)*(gram/1,000,000}tg)*(lb/454 grams)*(3 78 L/gal)*(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 /> I <br />