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CAMB RIA <br /> Table 2 Mass Removal Data,Shell-branded Service Station,3725 Tracy Boulevard,Tracy,California <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 removed(pounds)based on the formula volume(gal)x concentration(pg/L)x(Oeug)x(pound/453 6g)x(3 785 L/gal) <br /> Volume removed(gallons)based on the formula tmass(pounds)x 453 6(g/pound)x(gal/3 785L)x(LJ1000cm3)]/dens1ty(g/cm3) <br /> Density inputs TPHg=0 73 g/cm3,benzene=0 88 g/cm3,MTBE=0 74 g/cm3 <br /> t 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 l l/l/01 event <br /> 3 MWAA 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 />