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Table 4. Summary of Groundwater Extraction System Data,ARCO Station 2133, Stockton, California <br /> Sample calculations <br /> Removal rate calculation <br /> j lbs removed=("x"WL)*(gram/1,000,000µg)*(lb/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 Is*gallon/6 2 lbs <br /> I <br /> I <br /> I <br /> 1 <br />