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0 0 <br /> Table 4 Summary of Groundwater Extraction System Data, ARCO Station 2133, Stockton, California <br /> Sample calculations <br /> Removal rate calculation <br /> lbs removed=( x' RglL)*(gram/1,000,000 pg)*(1b/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 OIL O luent LMICLntratiOnS <br /> that had the highest TPH value <br /> Gallons removal calculation(for TPH) <br /> gallons removed=lbs*gallon/6 2 lbs <br />