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CAMBRIA , <br /> Table 1.Mass Removal Data,Shell-branded Service Station,3725 Tracy Boulevard,Tracy,California <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(µg1L)x(gll(Pug)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(ga1/3.785L)x(LJ1000cm3)]/density(glcm3) <br /> Density inputs: TPHg=0.73 g/cm3,benzene=0.88 g/cm3,MTBE=0.74 g/cm3 <br /> 1 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 /> 3 MW-IA 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 />