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Table A-3 Dual Phase Extraction System-Groundwater Extraction Performance Data ARCO 4932 16 East Harding Way,Stockton California REPORTING PERIOD First QUARTER 2005 CUMULATIVE WATER DISCHARGED 1,263,300 gallons PERIOD WATER DISCHARGED 209,100 gallons CUMULATIVE AVERAGE DISCHARGE RATE 1 3 gpm TOT POUNDS REMOVED 1123 404 1396 TOT GALLONS REMOVED 184 055 226 PERIOD POUNDS REMOVED 10 004 1 5 PERIOD GALLONS REMOVED 1 02 001 02 Definitions Chemical Properties Vq/1- =Micrograms per liter Density of gasoline=6 1 pounds per gallon gpm =Gallons per minute Density of benzene=7 4 pounds per gallon lbs/day=Pounds per day Density of MtBE=6 18 pounds per gallon TPH =Total petroleum hydrocarbons MtBE =Methyl tert-Bury)Ether — =Not available Notes a System start-up and shake-down Groundwater samples collected prior to intitial discharge Water held in knockout b MtBE reported by EPA method 82608 Aslo reported as 390 000 pg/L by EPA method 624 c LEL monitoring device and totalizer certification conducted LEL monitoring device not waterproof,replacement ordered Water held in knockout d Permanent system startup a System shutdown for carbon changeout System restarted g Data not available at time of reporting h Benzene and MtBE analysis run without prior method blank Analysis run beyond the EPA recommended holding time reported benzene as 1,200 pglL and MtBE as 29 000 Pg/L i Groundwater extraction system was shutdown 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 samples were received Oa/25103 GWE system shut dorm due to air stripper failure k Totalizer obtained 09/09/03 1 Totalizer obtained 08/14/03 in Air stripper additive installed to prevent scaling Tosco M 5949!0&MlARCO 4932 O&M Tables 1 Q05 xis ge 2 Of 2