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CAMBRIA <br /> Table 1 Mass Removal Data,Shell-branded Service Station,3725 Tracy Boulevard,Tracy,California <br /> Abbreviations&Notes <br /> TPHg=Total purgeable hydrocarbons as gasoline <br /> MTBE=Methyl tertiary butyl ether <br /> ppb=Parts per billion,equivalent toµg/L <br /> jig=Micrograms <br /> L=Liter <br /> gal=Gallon <br /> g=Gram <br /> Groundwater extracted by vacuum trucks provided by ACTI through December 2001 Phillips Services as of January 2002 Water disposed of at a Martinez refinery <br /> TPHg and benzene analyzed by EPA Method 8015/8020 <br /> MTBE analyzed by EPA Method 8260 results by EPA Method 8020 shown in italics <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(pgtL)x(g/1(PjLg)x(pound1453 6g)x(3 785 Ugal) <br /> Volume removed(gallons)based on the formula [mass(pounds)x 453 6(g/pound)x(gaU3 785L)x(Ul(1(IOcm3)11 dens1ty(g/cm3) <br /> Density inputs TPHg=0 73 g/cm3,benzene a 0 88 g/cm3 MTBE=0 74 g/cm3 <br /> I Concentrations based on most recent groundwater monitoring results for each hydrocarbon constituent <br /> 2 Began performing vacuum purging with a double diaphragm pump,since there was carbon filter breakthrough during the 11/l/01 event <br /> MW-1A did not produce much water on May 6,2001(may have been vapor locked),so the total amount was taken from BF 1 <br /> 0813 Page 3 of 3 <br />