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Table 6 Dual Phase Extraction System-Groundwater Treatment Performance Data - ARCO 4932 16 East Harding Way, Stockton, California TPH as Gasoline Benzene MtBE Average Influent Influent Influent Totalizer Volume Discharge Concen- Removal Net Removed Concen-Removal Net Removed Concen-Removal Net Removed Sample Date Value Discharged Rate tration Rate Removed To Date tration Rate Removed To Date tration Rate Removed To Date ID Sampled (gallons) (gallons) (gpm) (pg/L) (lbs/day) (pounds) (pounds) (pg/L) (lbs/day) (pounds) (pounds) (pg/L) (lbs/day) (pounds) (pounds) GW Inf 05/14/03 a,b 510 0 0 41,000 -- 0 0 10,000 -- 0 0 300,000 -- 0 0 — 05/29/03 c 630 0 0 -- 0 0 0 -- 0 0 0 -- 0 0 0 GW INF 07/08/03 d 1,000 0 0 190,000 0 0 0 5,300 0 0 0 260,000 0 0 0 INF 08/07/03 h 47,800 46,800 1 1 28,000 14 43 43 1,300 0 043 13 1 3 29,000 1 9 56 56 TOT WATER DISCHARGED(gal) 46,800 TOT AVG DISCHARGE RATE(gpm) 1 1 TOT POUNDS REMOVED 43 1 3 56 TOT GALLONS REMOVED 70 017 91 Definitions Chemical Properties pg/L = 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-Butyl Ether -- = Not available Notes a System start-up and shake-down Groundwater samples collected prior to mtltlal discharge Water held in knockout b MtBE reported by EPA method 8260B Asto 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 e System shut down for carbon changeout f 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 pg/L and MtBE as 29,000 pg/L i I Tosco Marketing/5949/0&WARCO 4932 O&M Tables 3Q03 As