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1i i t2' TaTiTe 3 Dual Phase Extraction System-Groundwater Extraction Performance Data I 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 pate ID Sampled (gallons) (gallons) m ( fL (lbs/day) (pounds) (pounds) L Ibslda (pounds) (pounds) IL Ibslda (pounds) ounds GW Inf 05/14/03 a,b 510 0 0 41 000 0 0 0 10 000 0 0 0 300 000 0 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 In 47,800 46 800 108 28,000 1 4 425 425 1,300 0 04 129 1 29 29,000 1 9 564 56 4 — 08/14/03 i 64,200 16,400 163 — 0 5 3 8 464 -- 003 018 147 — 0 6 4 0 604 -- 09/02/03 f,1 64,200 0 0 -- 0 0 464 — 0 0 147 -- 0 0 604 -- 09/05/03 f k 68,200 4,000 0 93 -- 0 4 12 475 002 0 06 1 53 -- 0 4 1 1 61 5 INF 09/09/03 68,200 0 0 41,000 0 0 475 2 400 0 0 1 53 38,000 0 0 61 5 — 10/09/03 118 600 50,400 1 1 — 0 6 172 648 — 003 101 2 54 0 5 16 0 775 — 10/23/03 140 560 21 960 1 1 — 0 4 52 700 — 002 0 31 2 85 — 0 3 4 6 82 0 10129/03 141 980 1,420 0 2 — 0 1 0 3 703 — 000 002 287 — 00 0 3 82 3 — 11/05/03 146 440 4 460 0 5 — 0 1 0 6 709 — 0 01 0 04 290 — 01 0 4 828 GW-INF 11113/03 m 151,000 4 560 0 2 16 000 0 1 0 6 71 5 980 000 0 04 2 94 12 000 01 0 5 832 INF 12/03/03 184,200 33 200 0 8 12 000 0 2 3 3 74 8 770 001 021 315 18 000 0 3 5 0 882 REPORTING PERIOD Fourth Quarter 2003(9!9!2003 to 121312003) CUMULATIVE WATER DISCHARGED 183,200 gallons PERIOD WATER DISCHARGED 116,000 gallons CUMULATIVE AVERAGE DISCHARGE RATE 0 8 gpm TOT POUNDS REMOVED 748 315 882 ,TOT GALLONS REMOVED 123 043 143 PERIOD POUNDS REMOVED 273 163 267 PERIOD GALLONS REMOVED 45 1 022 1 4 3 Definitions Chemical Properties_ pglL =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 tent-Suryl 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 8260B Aslo reported as 390 000 pg1L 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 In Benzene and MtBE analysis run without prior method blank Analysis run beyond the EPA recommended holding time reported benzene as 1,200 gg1L and MtBE as 29,000 pg1L i Groundwater extraction system was shut down to await for samples taken on 08/07/03 to confine that effluent MtBE hit was in fact a laboratory anamoly The 08/07/03 samples were received 08/25/03 GWE system shut down 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 Markebng/5949/0&WARCO 4932 O&M Tables 1004