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Table 2 Recent Groundwater Oxygenate and Fuel Additive Analytical Data Stockton Terminals Technical Committee Port of Stockton Stockton, California Sample Sample MTBE DIPE ETBE TAME TBA Methanol Ethanol 1,2-DCA EDB Identification Date (Ng/L) (pg/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) Comments ARCO AR/MVV-1A 05/08/08 1,200 <5.0 <5.0 26 2,300 <600 <50 -- - R/MW-1A 06/25/08 1,100 - - - 2,200 - - - - R/MW-1A 07/28/08 940 - --- - 2,000 - - - - R/MW-1A 08/07/08 530 <2.5 <2.5 11 1,500 <250 <50 - - R/MW-1A 08/26/08 360 - -- - <1,000 - - - - R/MW-1A 11/06/08 72 <0.50 <0.50 1.3 1,800 <50 2,300 - - R/MW-1A 02/04/09 180 <0.90 <0.90 3.6 540 <90 <50 - - R/MW-1B 05/08/08 52 2.7 <0.50 <0.50 960 <50 <50 - - R/MW-1B 08/06/08 25 2.3 <0.50 <0.50 470 <80 ' <50 - -- R/MW-1B 11/07/08 18 1.7 <0.50 <0.50 540 <100 <200 ' - - R/MW-1B 02/04/09 48 2.3 <0.50 <0.50 1,000 <80 <50 - - R/MW-2A 08/26/08 <5.0 - - - <100 - - - - AR/MW-3A 05/09/08 88 <15 <15 <15 210 <1,500 <150 - - R/MW-3A 06/25/08 <50 - - - <1,000 - - - - R/MW-3A 08/07/08 160 <15 <15 <15 320 <1,500 <150 - - R/MW-3A 11/06/08 100 <15 <15 <15 4,500 <1,500 <4,000 - - R/MW-3A 02/05/09 100 <15 <15 <15 2,700 <1,500 <150 - - AR/MW-5A 05/09/08 1,900 <4.0 <4.0 24 460 <400 <50 - - R/MW-5A 08/07/08 2,100 <4.0 <4.0 26 600 <800 ' <50 - - R/MW-5A 3 11/07/08 2,500 <5.0 <5.0 26 5,600 <500 6,900 - - R/MW-5A 02/06/09 8,000 <9.0 <9.0 100 2,200 <4,000 ' <150 - - AR/MW-5B 05/07/08 8.8 0.92 <0.50 <0.50 9.5 <50 <50 - - R/MW-56 08/05/08 15 0.77 <0.50 <0.50 7.4 - - - - R/MW-5B 3 11/05/08 4.0 <0.50 <0.50 <0.50 9,400 - - - - R/MW-5B 02/06/09 18 0.92 <0.50 <0.50 44 <200 <50 - - AR/MW-5C 05/06/08 26 <0.50 <0.50 <0.50 <5.0 <50 <50 - - R/MW-5C 08/06/08 600 <0.50 <0.50 1.5 34 - - - - R/MW-5C 3 11/07/08 63 <1.0 <1.0 <1.0 4,900 - - - - R/MW-5C 02/06/09 170 <0.50 <0.50 0.68 880 <200 ' <50 - - 1009 STTC gwtables.xls Page 1 of 14