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i • • <br /> CAMBRIA <br /> Table 1 Mass Removal Data,Shell-branded Service Station,3725 Tracy Boulevard,Tracy,California <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(µg/L)x(gldAg)x(pound/453 6g)x(3 785 Llgal) <br /> Volume removed(gallons)based on the formula [mass(pounds)x 453 6(glpound)x(gal/3 785L)x(L/1000cm3)]/density(g/cm) <br /> Density inputs TP13g=0 73 8/cm3,benzene=0 88 g/cm3,MTBE=0 74 glcm3 <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 11/1101 event <br /> MW-lA did not produce much water on May 6,2001(may have been vapor-locked),so the total amount was taken from BF-1 <br /> I <br /> 0813 Page 3 of 3 <br />