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i • i <br /> CAMBRIA <br /> Table 1 Mass Removal Data,Shell-branded Service Station,3725 Tracy Boulevard,Tracy,California <br /> pg=Micrograms <br /> L=Liter <br /> gal=Gallon <br /> g—Gram <br /> Groundwater extracted by vacuum trucks provided by ACT] Water disposed of at a Martinez refinery <br /> TPHg and benzene analyzed by EPA Method 801519020 <br /> MTBE analyzed by EPA Method 8020(Method 82608 indicated by bold font) <br /> When constituents are not detected the concentration is assumed to be equal to the detection limit to subsequent calculations <br /> Mass removed(pounds)based on the formula volume(gal)x concentration(pg1L)x(g/10'pg)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(ga113 785L)x(L/1000cm')l/density(plcm') <br /> Density inputs TPHg=0 73 glom' benzene=0 88 g/cm' MTBE—0 74 glcm' <br /> Concentrations based on most recent groundwater monitoring results for each hydrocarbon constituent <br /> Began performing vacuum purging with a double diaphragm pump,since there was carbon filter breakthrough during the 11/1101 event <br /> I <br /> 0813 Page 2 of 2 <br /> I <br />