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MAY-08-2000 16 47 CAMBRIA 510 420 9170 P 03/24 CRIA Table 1 -Groundwater Extraction System Analytical Results-- Shell-branded Service Station 341 East Maul Street,Ripon Sample Metcr MTBE TBA Ethanol Date Reading TPHg Benzene EPA 8260 EPA 8260 EPA 8260 (gallons) Concentrations m ppb Influent 03/10/00 0 <50 <0 5 24,900 <10,000 <50000 03/13/00 1,100 69* 6 34,000 <50 <200 03/15/00 16,905 <50 <0 5 18,000 <50 <200 03/31/00 17,500 NA <100 44,800 <40000 <200000 04/05/00 34,300 <5,000 <50 22,700 <10000 <50000 04/07/00 51,700 <5,000 <50 18,100 <10000 <50000 04/28/00 51,700 <2,500 <25 6,360 <4000 <50000 05/01/00 64,200 <2,500 <25 4,880 <4000 <50000 After First 1,000-1bs Carbon Filter Vessel 03/10/00 0 <50 <0 5 <1 QO <100 03/13/00 1,100 <50 <0 5 81 <50 <200 03/15/00 16,905 <50 <0 5 56 <50 <200 03/31/00 17,500 NA <0 5 122 <20 <100 04/05/00 34,300 <50 <0 5 0 779 <20 <100 04/07/00 51,700 <50 <0 5 <05 <20 <100 04/29/00 51,700 <50 <0 5 <0 5 CLO <100 05/01/00 64,200 <50 <0 5 <0 5 <20 <100 After Second 1,000-ibs Carbon Filter Vessel 03/10/00 0 NA NA NA NA NA 03/13/00 1,100 <50 <0 5 <1 <50 <200 03/15/00 16,905 <50 <0 5 <1 <50 <200 03/31/00 17,500 NA <0 5 <0 5 <50 <100 04/05/00 34,300 <50 <0.5 <0 5 <50 <100 04/07/00 51,700 <50 <0 5** <0 5 <50 <100 04/28/00 51,700 X50 <0 5 <0 5 <0 <100 05/01/00 64,200 <50 <0 5 <0 5 <20 <100 Effluent 03/10/00 0 <50 <0 5 <1 <20 <100 03/13/00 1,100 <50 <0 5 03/15/00 16,905 <50 <0 5 <1 <50 <200 03/31/00 17,500 NA <0 5 <0 5 450 <100 04/02/00 17,500 <50 <0 5 <0 5 050 <100 04/05/00 34,300 <50 <0 5 <0 5 <50 <100 04/07/00 51,700 <50 <0 5 <0 5 <50 <100 0,412 VU 5ijiDV IJV <0✓ �V 5 VV 05/01/00 64,200 X50 <0 5 <0 5 <20 <100