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Table 11 Dual Phase Extraction System-Soil Vapor Influent Analytical Data and Mass Recovery Parcel 2A-L&M OU 666 West Weber Avenue,Stockton,CA (In order to show best estimate,recovery calculations assume one-half of the detection limit when the compound is reported as less than the detection limit.) Well Influent Concentrations TPHg Recovery TPHd Recovery Benzene Recovery MtBE Recovery Hour Field Recovery Recovery Recovery Recovery Meter Flow Rate Period Net Cumulative Rate Period Net Cumulative Rate Period Net Cumulative Rate Period Net Cumulative Date Sample Reading Rate TPHg TPHd Benzene MtBE (lbs/day) Recovery Recovery (lbs/day) Recovery Recovery (lbs/day) Recovery Recovery (lbs/day) Recovery Recovery Sampled ID Notes (hours) (scfm) (ppmv) (ppmv) (ppmv) (ppmv) [1] (Ibs)[2] (Ibs)[3] [1] (Ibs)[2] (Ibs)[3] [1] (Ibs)[2] (Ibs)[3] [1] (Ibs)[2] (Ibs)[3] Definitions: --=Data not available NS=Not sampled or not analyzed <=Value is less than laboratory reporting limit ppmv=Parts per million by volume lbs=Pounds scfm=Standard cubic feet per minute MtBE=Methyl tert-butyl ether TPHg=Total petroleum hydrocarbons as gasoline NA=Not applicable Notes: a=System permitted under ATC number N-4878-1-1. Source test for air board. Extracted groundwater being held in onsite holding tank. System shutdown following source test. b=System started for 24-hour collection of vapor PAH samples. c=System shut down following vapor PAH sampling. PAH results outside of ATC limits(no detectable PAHs in influent vapor stream);alternate ATC needed to operate. d =ATC Number N-4878-1-2 issued 7/20/2004.System restarted. e=Source test for air board. System shut down following source test due to on-site excavation activities. f=System shut down following completion of vapor PAH sample collection. g =System shut down since 6/3/2005 no discharge and no sampling activities. h =System sampled following startup. i =System running solely on ASVE-1 through ASVE-6. j =System air flow rate and temperature based on historical averages due to inadvertent omission from field notes. k=System not sampled for analytical due to electrical problems with the extraction blower.Removal calculation based on previous months analytical data. I =SV-INF collected one day after O&M readings due to collapse of sample bag collected on 7/30/2007. m=Diesel analyzed by Air Toxics LTD via EPA Method TO-17. n =System shutdown with regulatory approval. TPHd sampled on 10/28/11 o=Influent samples not obtained due to system shutdown status. p=Influent samples obtained due to planned restart of system. Kiff Analytical Molecular Weights: Specific Weight: TPHg=95 g/mol Specific Weight of gasoline=6.1 pounds per gallon Benzene=78.1 g/mol Specific Weight of benzene=7.4 pounds per gallon MtBE=88.2 g/mol Specific Weight of MtBE=6.18 pounds per gallon Specific Weight of diesel=7.18 pounds per gallon Air Toxics Molecular Weights: TPHd= 233 g/mol Equations: [Average of consecutive concentrations(ppmv)] Recovery Calculations=----------------------------------------------------- X[Molecular Weight(g/mole)]X[1 Ibs/453.59 g]X[1.2641 moles/1 cf]X[Average of consecutive Flow Rates(scfm)]X[60 min/hr]X[24 hr/day]=XX.XXX Ibs/day [1,000,000 parts] I:\Tidewater\TW Stockton(P2A)\Engineering\O&M\Tables\O&M Tables 2012\4Q12\Parcel 2A OM Tables 4Q12.xlsx Page 3 of 3