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666 West Weber Avenue, Stockton, CA <br />(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.) <br />Table 19 <br />Apartment Soil Vapor Extraction System - Soil Vapor Influent Analytical Data and Mass Recovery <br />Parcel 2A - L&M OU <br />Definitions: <br />< = Value is less than laboratory reporting limit <br />-- = Data not available <br />lbs = Pounds <br />MtBE = Methyl tert-butyl ether <br />ppmv = Parts per million by volume <br />scfm = Standard cubic feet per minute <br />TPHg = Total petroleum hydrocarbons as gasoline <br />TPHd = Total petroleum hydrocarbons as diesel <br />Notes: <br />a = System permitted under ATC number N-4878-2-0. Source test for air board. <br />b = Diesel analyzed by Air Toxics LTD via EPA Method TO-17. <br />c = Diesel sample collected on 9/22/11 <br />d = Diesel sample collected on 10/28/11 <br />Air Toxics Molecular Weights: <br />TPHg = 95 g/mol TPHd = 233 g/mol <br />Benzene = 78.1 g/mol <br />MtBE = 88.2 g/mol <br />Specific Weight: <br />= 6.1 pounds per gallon <br />= 7.4 pounds per gallon <br />= 6.18 pounds per gallon <br />= 7.18 pounds per gallon <br />Equations: <br />----------------------------------------------------------------------------------------------X [Molecular Weight (g/mole)] X [1 lbs/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 lbs/day <br />Specific Weight of TPHg <br />[1,000,000 parts] <br />[Average of consecutive concentrations (ppmv)] <br />Recovery Calculations = <br />Specific Weight of benzene <br />Specific Weight of MtBE <br />Kiff Analytical Molecular Weights: <br />Specific Weight of Diesel <br />I:\Tidewater\TW Stockton (P2A)\Engineering\O&M\Tables\O&M Tables 2012\Parcel 2A OM Tables 1Q12.xlsx Page 2 of 2