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= M my = = = = = = <br /> Table A-3 <br /> Dual Phase Extraction System-Groundwater Extraction Performance Data <br /> ARCO 4932 <br /> 16 East Harding Way Stockton,California <br /> REPORTING PERIOD SECOND QUARTER 2005 <br /> CUMULATIVE WATER DISCHARGED 1,307,600 gallons <br /> PERIOD WATER DISCHARGED 145,000 gallons <br /> CUMULATIVE AVERAGE DISCHARGE RATE 13 gpm <br /> TOT POUNDS REMOVED 1128 404 1399 <br /> TOT GALLONS REMOVED 185 065 226 <br /> PERIOD POUNDS REMOVED 06 000 03 <br /> PERIOD GALLONS REMOVED 01 000 1 00 <br /> Definitions Chemical Properties <br /> NgIL=Micrograms per liter Density of gasoline=6 1 pounds per gallon <br /> gpm =Gallons per minute Density of benzene=7 4 pounds per gallon <br /> lbs/day=Pounds per day Density of MtBE=6 18 pounds per gallon <br /> TPH =Total petroleum hydrocarbons <br /> MtBE=Methyl ten-Bury)Ether <br /> — =Not available <br /> Notes <br /> a System start-up and shake-down Groundwater samples collected prior to mtitial discharge Water held in knockout <br /> b MtBE reported by EPA method 8260B Aslo reported as 390 000 NgIL by EPA method 624 <br /> c LEL monitoring device and totalizer certification conducted LEL monitoring device not waterproof replacement ordered Water held in knockout <br /> d Permanent system startup <br /> e System shut down for carbon changeout <br /> f System restarted <br /> g Data not available at time of reporting <br /> h Benzene and MtBE analysis run without prior method blank Analysis run beyond the EPA recommended holding time reported benzene as 1,200 NgIL and MtBE as 29,000 <br /> Ng1L <br /> i Groundwater extraction system was shut down to await for samples taken on 08/07/03 to confirm that effluent MtBE hit was in fact a laboratory anamoly The 08/07/03 <br /> samples were received 08/25/03 <br /> GWE system shut down due to air stripper failure <br /> k Totalizer obtained 09/09/03 <br /> 1 Totalizer obtained 08/14/03 <br /> m Air stripper additive installed to prevent scaling <br /> n GWE system down due to transfer pump failure and totalizer failure <br /> Tosco Markebrigl5949IO&MlARCO 4932 O&M Tables 2005 As Page 2 d 2 <br />