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• CAM*IA _ <br /> ,Table 4 Soil Vapor Extraction Test Mass Removal Data,Former Shell Semee Station/Econo Gas, 880 Victor Road,Lodi,California � <br /> TPHg Benzene MTBE <br /> Hour Cumulative Hydrocarbon Concentrations Removal Cumulative Removal Cumulative Removal Cumulative <br /> Well ID Meter Operation Vacuum(in Hg) Flow Rate TPHg I Benzene I MTBE Rate Removed Rate Removed Rate Removed <br /> Date/Time (hours) (hours) Gage Absolute I (cfn) (scfm) (Concentrations in ppmv) (#/hour) (#) (#/hour) (#) (#/hour) (#) <br /> 10/11/2003 1100 10283 467 1 1 28 8 625 60 75 -- -- 0 022 1 335 0 000 0 005 0 020 0 710 <br /> 10/11/2003 1126 10288 472 1 1 28 8 635 61 77 - -- 0 022 1 346 0 000 0 006 0 020 0 720 <br /> 10/11/2003 12 01 10294 47 8 1 1 28 8 635 61 27 <0 31 24 0 022 1 359 0 000 0 006 0 020 0 732 <br /> Total Pounds Removed TPHg 268 Benzene 0 012 MTBE 142 <br /> Abbreviations and Notes <br /> cfm=Cubic feet per minute # = Pounds <br /> scfm=Standard cubic feet per minute ppmv = Parts per million by volume <br /> in Hg=Inches mercury column TPHg=Total petroleum hydrocarbons as gasoline <br /> Atmospheric pressure=29 921 in Hg MTBE=Methyl tertiary butyl ether <br /> Absolute=Atmospheric pressure-gage vacuum(in Hg) <br /> System flow rates and vacuum readings collected from two-inch manifold <br /> Bold=Sample concentrations from lab analysis Non-Bald=Field measured concentrations by a Honba organic vapor analyzer <br /> TPHg,Benzene,and MTBE analyzed by EPA Method 8260 from 1-liter tedlar bag samples <br /> TPHg I Benzene I MTBE removal rate=Rate based on Bay Area Air Quality Management District's Manual of Procedures for Soil Vapor Extraction dated July 17, 1991 <br /> (Rate=Laboratory analytical concentration(ppmv)x system flow rate(scfm)x(I lb-mole/386ft3)x molecular weight(86 lb/lb-mole for TPHg,79 IbAb-mole for <br /> benzene,88 lb/lb-mole for MTBE)x 60 min/hour x I/1,000,000) <br /> Cumulative TPHg 1 Benzene I MTBE removal=removal rate multiplied by the hour-interval of operation plus the previous total <br /> When constituents are not detected,the concentration is assumed to be equal to half the reporting limit in subsequent calculations <br /> a=Extracted out of holding time <br /> 0955 Page 3 of 3 <br />