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• • • <br /> Table 4. Summary of Groundwater Extraction System Data, ARCO Station 2133, Stockton, California <br /> Start-up date 4118191 <br /> Date Total volume, Average Effluent concentration, /l Net removal,lbs&gallons <br /> sampled enod extracted,gallons flowrate,g m TPH-G B TPH-G B <br /> Totals and averages 1219194318195 1,100,220 88 <1000 38 20 lbs 01 lbs <br /> for reporting period 03 gals 00 gals <br /> Totals and averages 4/18/91-318195 10,740,252 55 736 59 570 lbs 49 lbs <br /> cumulative 92 gals 07 gals <br /> Sample calculations <br /> Removal rate calculation <br /> lbs removed—("x"gg/L)*(gram/1,000,000 ug)*(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 s lbs*gallon/6 2 lbs(density for TPH-G is 6 2,however,for Benzene it is 7 32) <br />