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4 <br /> i <br /> CAMBRIA <br /> Table 4 Soil Vapor Extracuon Test Mass Removal Data,Former Shell Service Statlon/Econo Gas,880 Victor Road,Lodi,California <br /> MIR Benzene MTBE <br /> Hour Cumulative Hydrocarbon Concentrations Removal Cumulative Removal Cumulahve Removal Cumulative <br /> Well 11) Meter Operation Vacuum(in Hg) Flow Rate TPHg I Benzene I MTBE Rate Removed Rate Removed Rate Removed <br /> Datelllme (hours) (hours) Gage Absolute I (cfm) (scfm) (Concentrations in ppmv) Whour) (#) (#/liour) (#) (#/hour) M <br /> 10/11!2003 1100 10283 467 11 299 625 60 75 0 022 1335 0 000 0 005 0 020 0 710 <br /> 1011112003 11 26 1028 8 472 1 I 288 635 61 77 00,22 1 346 0 000 0 006 0 020 0 720 <br /> IOM 112003 12 01 10294 479 1 11 288 635 61 27 c031 24 0 022 1 359 0 000 0 006 0 020 0 732 <br /> Tatal Pounds Removed TPH9 268 Bertzens D 012 MTBE, 142 <br /> Abbreviations and Notes <br /> cfm=Cubic feet per minute # _ finds <br /> scfm-Standard cubic feet per minute ppmv = Parts per million by volume <br /> in Hg=lnchm mercury column TPHg a Total petroleum hydrocarbons as gasohnc <br /> Atmospbenc pressure=29 921 in Hg MTBE=Methyl tertiary butyl ether <br /> Absolute=Atmospheric pressure gage vacuum(raft <br /> System(low rates and vacuum readings collected from two-inch manifold <br /> Bold=Sample ceocentrauons from lab analysis Noa Bold=Field measured concenrtauons by a Honba organic vapor analyzer <br /> TPHg Benzene and MT13E analyzed by EPA Method 8260 from 1 liter tedlar hag Samples <br /> TPHg/Benzene/MTBE removal rate=Rate based on Bay Area Air Quality Management District s Manual of Procedures fee Soil Vapor Extraction dated July 17 1991 <br /> (Rate=Laboratory analytical conceatration(ppmv)x system flow rate(scfm)x(I lb mole/386W)x molecular weight(86 Ih/llrmole for TPHg 78 lb/lb male for <br /> benzene 88 Ib/lb-mcle for MTBE)It 60 rma/hour x 1/1 000 000) <br /> Cumulative TFHg/Ben=c/MTBE removal=removal rate multiplied by the hour interval of operauon plus the previous total <br /> When constituents arc not detected the coiaceatiauan IS assumed to be equal to half the reporting limit in subsequent calculations <br /> a=Extracted out of holding ume <br /> 0955 Page 3 of 3 <br />