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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 F 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) (pg/L) (Ng/L) ( g/L) (pg/L) (ug/L) PH (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 46,800 108 <50 <0 50 <0 50 <0 50 <0 50 <0 50 836 Yes -- 08/14/03 i 64,200 16,400 163 EFF 08/25/03 1 -- -- -- -- <0 50 <0 50 <0 50 <0 50 <0 50 851 Yes -- 09/02/03 a -- -- 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 50,400 117 — EFF 10/23/03 140,560 21,960 109 <50 <0 50 <0 50 <0 50 <0 50 <0 50 796 Yes -- 10/29/03 141,980 1,420 0 16 -- 11/05/03 146,440 4,460 044 -- GW-EFF 11/13103 I,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 33,200 115 <50 <0 50 <0 50 <0 50 <0 50 <0 50 820 Yes EFF 01/12/04 n 263,870 79,670 138 <50 <0 50 <0 50 <0 50 <0 50 <0 50 862 Yes EFF 02/04/04 328,800 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 REPORTING PERIOD March 2004(02104104 to 03103104) TOT WATER DISCHARGED (gal) 406,240 PERIOD WATER DISCHARGEDt(gal) 78,440 PERIOD AVG DISCHARGE RATE(gpm) 1 95 TOTAL.AVG DISCHARGE RATE (gpm) 1 11 Definitions Wastewater Discbarch Permit limitations pg/L = Micrograms per liter Flow Rate<5 gpm gpm = Gallons per minute TPH < 100,000 lig/l TPH =Total petroleum hydrocarbons Total BTEX<4,570 pg/I MtBE = Methyl-tert-butyl ether Benzene<500 pg/I -- = not available MtBE<0 5 pgll 50 <pH < 100 Notes a System start-up and shake-down Groundwater samples collected prior to intitial discharge Water held in knockout b LEL monitoring device and totalizer certification conducted LEL monitoring device not waterproof,replacement ordered Water held in knockout c Permanent system startup d System shut down for carbon changeout e System restarted 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 time still reported reported the analytes as non-detect h Sample was not received by the laboratory within the EPA recommended holding time for pH i 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 GWE 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 I IARC01493210&MARCO 4932 O&M Tables 1004