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Tam Groundwater Extraction System 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 Conten-Removal Net Removed Sample Date Value Discharged Rate tration Rate Removed To Date tration Rate Removed To Date tratton Rate Removed To Date ID Sampled (gallons) (gallons) (g m) .(pr (lbs/da ) (pounds) (pounds) (ug/L) (lbs/day) (pounds) (pounds) (pg1L) (lbs/day) (pounds) (pounds) 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 h 47,800 46,800 1 08 28,000 1 4 425 425 1,300 004 1 29 1 29 29,000 1 9 564 564 08/14/03 t 64 200 16 400 1 63 - 05 38 464 - 003 018 1 47 06 40 604 09/02/03 f,1 64,200 0 0 0 0 464 0 0 1 47 0 0 604 09/05/03 1,k 68,200 4,000 0 93 04 1 2 475 002 006 1 53 0 4 1 1 61 5 INF 09/09/03 68,200 0 0 41,000 0 0 475 2,400 0 0 153 38,000 0 0 615 10/09/03 118,600 50,400 11 06 172 648 - 003 101 254 05 160 775 -- 10/23/03 140,560 21,960 1 1 04 52 700 - 002 031 285 03 45 820 10/29/03 141 980 1 420 02 01 03 703 000 002 287 00 0 3 823 11/05/03 146,440 4,460 0 5 01 06 709 001 004 290 01 04 828 W INF 11/13/03 m 151,000 4,560 0 2 16,000 01 06 71 5 980 000 004 294 12 000 01 0 5 832 INF 12/03/03 184 200 33 200 08 12 000 0 2 33 748 770 001 021 315 18 000 03 50 882 REPORTING PERIOD Fourthl0t anter 2003(91912003 to 121312003) CUM6Ia4TIVE WATER DISCHARGED 183,200 gallons PERIOD WATER DISCHARGED 116,000 gallons I CUMULATIVE AVERAGE DISCHARGE RATE 0 8 gpm TOT POUNDS REMOVED 748 315 882 ,TOT GALLONS REMOVED 123 9 43 143 PERIOD POUNDS-REMOVED 273 163 267 PERIOD GALLONS REMOVED 45 022 43 Definitions Chemical Properties ug/L=Micrograms per Icier TPH=Total petroleum hydrocarbons Density of gasoline=6 1 pounds per gallon gpm=Gallons per minute MtBE=Melhy1 tert-Bury)Ether Density of benzene=7 4 pounds per gallon lbs/day=Pounds per day -=Not available Density of MtBE=6 18 pounds per gallon Notes a System start-up and shake down Groundwater samples collected pnor to tntitial discharge Water held in knockout b MtBE reported by EPA method 82608 Aslo reported as 390,000 ug/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 MtSE analysis run without prior method blank Analysts run beyond the EPA recommended holding time reported benzene as 1,200 ug/L and MtBE as 29 000 #g/L. r Groundwater extraction system was shut down to await for samples taken on 08/07/03 to confirm that effluent MtBE hit was to fact a laboratory anamoty The 08/07/03 samples were received 08/25/03 WE system shutdown due to air stripper failure k Totalizer obtained 09/09/03 1 Totalizer obtained 08/14/03 m Air stripper additive installed to prevent scaling Tosca Marketung/594910&WARCO 4932 O&M Tables 4003)ds