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(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 />Period Period Period Period Period Period Period <br />Volume Net Cumulative Net Cumulative Net Cumulative Net Cumulative Net Cumulative Net Cumulative <br />Date Extracted TPHg TPHd TPHo Benzene MtBE TBA Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed Adsorbed <br />Sampled (gallons) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (µg/L) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) (lbs) <br />Table 12 <br />666 West Weber Avenue, Stockton, CA <br />Dual Phase Extraction System - Groundwater Mass Recovery and Adsorption <br />Parcel 2A - L&M OU <br />TBA RecoverySystem Data Influent Concentrations TPHg Recovery TPHd Recovery TPHo Recovery Benzene Recovery MTBE Recovery <br />Definitions:Equations: <br />TPHg = Total petroleum hydrocarbons as gasoline gal = gallons <br />TPHd = Total petroleum hydrocarbons as diesel μg/L = micrograms per liter lbs adsorbed = (gallons groundwater extracted)*(AVG ug/l removed)*(2.2 lb/kg)*(3.785 l/gal)*(10^-9 kg/ug) <br />TPHo = Total petroleum hydrocarbons as oil lbs/day = pounds per day <br />MTBE = Methyl-tertiary butyl ether lbs = pounds <br />TBA = tertiary-butyl alcohol < = Value is less than laboratory reporting limit <br />gpm = gallons per minute -- = Not analyzed/Not applicable <br />I:\Tidewater\TW Stockton (P2A)\Engineering\O&M\Tables\O&M Tables 2012\Parcel 2A OM Tables 1Q12.xlsx Page 3 of 3