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i • i <br /> CAMBRIA <br /> Table 2 Interim Remediation-Vapor Phase Mass Removal Data-Shell-branded Service Station,6131 Pacific Avenue, Stockton,California <br /> Abbreviations and Notes <br /> ACFM=Actual cubic feet per minute <br /> SUM=Standard cubic feet per minute <br /> SCFM=(ACFM)(Applied Absolute Vacuum 1 Atmospheric Absolute Vacuum) <br /> System flow rates and vacuum readings collected from 4-inch manifold <br /> TPHg=Total petroleum hydrocarbons as gasoline, MTBE =Methyl tertiary butyl ether <br /> ppmv = Parts per million by volume 4 = Pounds <br /> TPHg,Benzene and MTBE analyzed by EPA Method 8260 from 1-liter tedlar bag samples <br /> TPHg/Benzene/MI BE removal rate=Rate based on Bay Area Air Quality Management District's Manual of Procedures for Soil Vapor Extiacuon dated July 17,1991 <br /> (Rate=Laboratory analytical concentration(ppmv)x wellhead flow rate(scfm)x(I lb-molel386ft3)x molecular weight(86 lb/lb-mole for TPHg,781b(lb mole for benzene,88 lhllb-mole for MTBE)x 60 minthour x 111 000 000) <br /> When constituents arf not detected,the concentration is assumed to be equal to half the reporting limit in the rate calculation <br /> Cumulative TPHg/Benzc ne/MTBE removal=Previous removal rate multiplied by the hour-interval of operation plus the previous total <br /> Itahctzed TPHg concentration data is field measured data <br /> Rahcized Flow(ACRI) is calculated data(well flow(acfm)=system flow(acfm) dilution flow(acfm)) <br /> 0854 Page 3 of 3 <br />