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� CRA n <br /> Table 3.Mass Removal Data,Shell-branded Service Station,2375 West Grant Line Road,Tracy,California <br /> j Abbreviations&Notes: <br /> TPHg=Total petroleum hydrocarbons as gasoline <br /> MTBE=Methyl tertiary butyl ether <br /> µgrL.=Micrograms per liter <br /> pg=Micrograms <br /> L=Liter <br /> gal=Gallon <br /> g=Gram <br /> "Well inaccessible <br /> Groundwater extracted by vacuum trucks provided by Onyx Industrial. Water disposed at Shell's Martinez refinery. <br /> Volume removed from individual wells is estimated based on total volume of water removed at each event. <br /> TPHg and benzene analyzed by EPA Method 8015/8020 or equivalent. <br /> MTBE analyzed by EPA Method 8260: <br /> When constituents are not detected,the concentration is assumed to be equal to half the detection limit in subsequent calculations. <br /> Mass removed(pounds)based on the formula:volume(gal)x concentration(µg/L)x(g/HO jig)x(pound/453.6g)x(3.785 L/gal) <br /> Volume removed(gallons)based on the formula: [mass(pounds)x 453.6(g/pound)x(gal/3.785L)x(L/1000cm)]/density(g/cm3) <br /> Density inputs: TPHg=0.73 9/cm3,benzene—0.88 g/cros,MTBE=0.74 g/cm3 <br /> Concentrations based on most recent groundwater monitoring results for each hydrocarbon constituent <br /> Italicized volumes are estimates. Actual volume data not received by vacuum truck company. <br /> Vaccuum truck company did not provide stingers for June 13,2006 event;therefore,they could not conduct event. <br /> I <br /> r <br /> 1 <br /> I <br /> I <br /> 1661 Page 2 of 2 <br /> r'3 <br />