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CAMB RIA <br /> Table 2.Mass Removal Data,Shell-branded Service Station, 3725 Tracy Boulevard,Tracy,California <br /> Abbreviations&Notes <br /> TPHg=Total purgeablc hydrocarbons as gasoline <br /> MTBE=Methyl tertiary butyl ether <br /> ppb=Parts per billion,equivalent to fcg/L <br /> µg=Micrograms <br /> L=Liter <br /> gal=Gallon <br /> g=Gram <br /> Groundwater extracted by vacuum trucks provided by ACT[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 remover!(pounds)based on the formula volume(gal)x concentration(µglL)x(91106pg)x(pound/453 6g)x(3 785 Ugal) <br /> Volume removed(gallons)based on the formula [mass(pounds)x 453 6(glpound)x(gal/3 785L)x(LIOOOcm3)]I density(g/cm3) <br /> Density inputs TPHg=0 73 g1cm3,benzene=0 88 g/cm3,MTBE=0 74 g/cm3 <br /> I Concentrations based on most recent groundwater monitoring results for each hydrocarbon constituent <br /> Z Began performing vacuum purging with a double diaphragm pump,since there was carbon filter breakthrough during the 1111101 event <br /> s 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 4 of 4 <br />