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I <br /> • 0 0 <br /> CAMBRIA <br /> Table 2 Mass Removal Data,Shell-branded Service Station,620 West Charter Way,Stockton,California <br /> Cumulative Cumulative Cumulative Cterrtolative <br /> Volume Volume TPHg TPHg TPHg Benzene Benzene Benzene MTBE MTBE MTBE <br /> Date Well Pumped Pumped Sample Concentration Removed Removed Concentration Removed Removed Concentration Removed Removed <br /> Purged ID (gal)^ (gal) Date (ppb) (pounds) (pounds) (ppb) (pounds) (pounds) (ppb) (pounds) (pounds) <br /> 24-Nov-03 MW-8 50 50 03-Nov-03 C25 000 0 005 0 005 <250 0 000 0 000 23 000 0 010 0 010 <br /> 24 Nov-03 MW-9 29 29 03-Nov-03 4 100 0 001 0 001 66 0 000 0 000 840 0 000 0 000 <br /> {�slz S?�sPS�tr�;�'�f€I �Hnt�i��dfirr r[c(ce:c <br /> Abbreviations&Nates <br /> TPHg=Total purgeable hydrocarbons as gasoline <br /> MTBE=Methyl tertiary butyl ether <br /> ppb=Parts per billion equivalent to ug/l <br /> Rg=Micrograms <br /> I=Liter <br /> gal=Gallon <br /> g=Gram <br /> Groundwater extracted by vacuum trucks provided by Onyx Industrial Services Water disposed of at Shell's Martinez refinery <br /> TPHg and benzene analyzed by EPA Method 8015/8020 or equivalent <br /> MTBE analyzed by EPA Method 8260 <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(ug/L.)x(g/106µg)x(pound/453 6g)x(3 785 Ugal) <br /> Volume removed(gallons)based on the formula [mass(pounds)x 453 6(glpound)x(galla 785L)x(L/1000cm3)]/density(g/em3) <br /> Density inputs TPHg=0 73 g/cm3 benzene=0 88 gJcm3 MTBE=0 74 glcm3 <br /> Note Concentrations based on most recent groundwater momtoring mutts for each hydrocarbon constituent <br /> i <br /> 0778 Page 1 of 1 <br /> I <br />