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' Table A-4 Dual Phase Extraction System-Groundwater Treatment Effluent Data ARCO 4932 16 East Harding Way,Stockton California Effluent Concentrations ' Average Totalizer Volume Discharge TPH as Ethyl- Total In Sample Date Value Discharged Rate Gasoline Benzene Toluene Benzene Xylenes MtBE Compliance ID Sampled (gallons) (gallons) (gpm) ( /L) /L) ( 1L (pg/L) (pqIL /L H (Yes/No) ' GW EFFL 05/14/03 a 510 0 0 <5,000 <0 50 <0 50 <0 50 <0 50 <0 50 948 Yes 05/29/03 b 630 0 0 GW EFF 07/08/03 c 1 000 0 0 <50 <0 50 <0 50 <0 50 <0 50 1 1 849 No EFF 08/07/03 g,h 47 800 46 800 1 08 <50 <0 50 <0 50 <0 50 <0 50 <0 50 836 Yes ' 08/14/03 i 64200 16 400 163 N - -- — EFF 08/25/03 1 <0 50 <0 50 <0 50 <0 50 <0 50 851 Yes 09/02/03 e 09/05/03 k — -- -- -- -- — -- -- -- -- EFF 09/09/03 68 200 4,000 093 <50 <0 50 <0 50 <0 50 <0 50 <0 50 880 Yes ' — 10/09/03 118 600 50,400 1 17 -- _ -- -- EFF 10!23103 140560 21,960 109 <50 <0 50 <0 50 <0 50 <0 50 <0 50 796 Yes — 10/29/03 141,980 1420 016 - — 11/05/03 146,440 4 460 044 -- -- -- -- -- -- — GW-EFF 11/13/03 1 m 151,000 4 560 040 <50 <0 50 <0 50 <0 50 <0 50 <0 50 756 Yes EFF 12/03/03 184 200 33 200 1 15 <50 <0 50 <0 50 <0 50 <0 50 <0 50 820 Yes EFF 01/12/04 n 263 870 79 670 1 38 <50 <0 50 <0 50 <0 50 <0 50 <0 50 862 Yes EFF 02!04104 328 800 64 930 196 <50 <0 50 <0 50 <0 50 <0 50 <0 50 853 Yes EFF 03/03/04 407 240 78 440 195 <50 <0 50 <0 50 <0 50 <0 50 <0 50 842 Yes EFF 04/05/04 486,070 78 830 166 <50 <0 50 <0 50 <0 50 <0 50 <0 50 870 Yes 04/30/04 d 529,020 42 950 1 19 — 05/25/04 d 529,020 0 000 -- -- -- -- -- — EFF 06/14/04 a 540,400 11,380 040 <50 <0 50 <0 50 <0 50 <0 50 <0 50 877 Yes ' EFF 07/13/04 638 970 98 570 236 <50 <0 50 <0 50 <0 50 <0 50 <0 50 866 Yes EFF 08/01/04 o 685 450 46,480 170 <50 <0 50 <0 50 <0 50 <0 50 <0 50 784 Yes EFF 09/09/04 744,200 58,750 105 <50 <0 50 <0 50 <0 50 <0 50 <0 50 827 Yes EFF 10/04/04 788,000 43 800 1 22 <50 <0 50 <0 50 <0 50 <0 50 <0 50 840 Yes EFF 11/01/04 844,100 56 100 1 39 <50 <0 50 <0 50 <0 50 <0 50 <0 50 854 Yes EFF 12/13/04 954,500 110 400 1 83 <50 <0 50 <0 50 <0 50 <0 50 <0 50 837 Yes EFF 01/05/05 1 011,400 56 900 172 <50 <0 50 <0 50 <0 50 <0 50 <0 50 847 Yes EFF 02/09/05 1,119,300 107,900 214 <50 <0 50 <0 50 <0 50 <0 50 <0 50 835 Yes EFF 03/15/05 1,163,600 44 300 090 <50 <0 50 <0 50 <0 50 <0 50 <0 50 723 Yes ' EFF 04/14/05 1,264 300 100,700 233 — -- — -- -- -- — REPORTING PERIOD First Quarter 2005(01105/05 03115105) TOT WATER DISCHARGED(gat) 1,263,300 PERIOD WATER DISCHARGED(gal) 209,100 PERIOD AVG DISCHARGE RATE(gpm) 210 TOTAL AVG DISCHARGE RATE rn 1 28 Definitions Wastewater Discharch Permit limitations pg1L =Micrograms per liter Flow Rate<5 gpm gpm =Gallons per minute TPH<100,000 pgA TPH =Total petroleum hydrocarbons Total BTEX<4,570 pgll MtBE =Methyl-tert-butyl ether Benzene<500 pgli ' — =not available MtSE<0 5}agll 50<pH< 100 Notes a System start-up and shakedown Groundwater samples collected pnor to intlbal discharge Water held in knockout b LEL monitonng device and totalizer certification conducted LEL morntonng device not waterproof,replacement ordered Water held in knockout c Permanent system startup d System shut down for carbon changeout e System restarted f Data not available at time of reporting g Analysis for all analytes except TPH as gasoline and pH were run without prior method blank Analysis run beyond the EPA recommended holding tame still reported reported the analytes as non-detect h Sample was not received by the laboratory within the EPA recommended holding time for pH ' 1 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 samples were received 08/25/03 Sample was taken to confirm 08/07/03 sample analyses which were not run according to standard EPA methods k OWE system shut down due to air stripper failure I Air stripper additive Installed to prevent scaling m Autodialer installed n Sample for pH was collected 01/21/04 because original sample was run beyond the EPA recommended holding time o Sample for pH was collected 08/25/04 because original sample was run beyond the EPA recommended holding time ' I I81DARC01493210&MMM Tables\ARCO 4932 O&M Tables 1Q05 As