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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) (Ng/L) (Vg/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) Comments AR/MW-9A 05/08/08 180 <4.0 <4.0 <4.0 200 <400 <50 - - R/MW-9A 05/08/08 180 <4.0 <4.0 <4.0 200 <400 <50 - - R/MW-9A 08/07/08 160 <2.5 <2.5 <2.5 130 <250 <50 - - R/MW-9A 08/26/08 190 - - - <500 - - - - R/MW-9A 11/06/08 120 <2.5 <2.5 <2.5 120 <1,500 ' <50 - - R/MW-9A 02/05/09 170 <2.5 <2.5 <2.5 120 <250 <50 - -- R/MW-9B 05/07/08 1.2 0.74 <0.50 <0.50 5.5 <50 <50 - - R/MW-96 08/06/08 0.69 0.65 <0.50 <0.50 11 - - - - R/MW-9B 11/05/08 0.86 0.66 <0.50 <0.50 14 - - - - R/MW-9B 02/04/09 1.2 0.59 <0.50 <0.50 13 - - - - R/MW-10A 05/08/08 12 <5.0 <5.0 <5.0 140 <500 <50 - - R/MW-10A 08/07/08 <15 <15 <15 <15 160 <1,500 <150 - - R/MW-10A 08/26/08 <400 - - - <8,000 - - - - R/MW-10A 11/06/08 <15 <15 <15 <15 77 <1500 <200 ' - - R/MW-10A 02/06/09 <15 <15 <15 <15 <70 <1,500 <150 - - AR/MW-1 1A 05/07/08 11 <0.50 <0.50 <0.50 540 <50 <50 - - R/MW-11A 08/06/08 24 <0.50 <0.50 <0.50 990 - - - - R/MW-11A 08/26/08 51 - - - 800 - - - - R/MW-11A 11/06/08 27 <0.50 <0.50 <0.50 8,500 - - - - R/MW-11A 02/04/09 7.8 <0.50 <0.50 <0.50 1,200 <80 <50 -- - AR/MW-1 1 B 05/08/08 430 <20 <20 <20 550 <2,000 <200 - - R/MW-11B 08/07/08 300 <9.0 <9.0 <9.0 380 <900 <90 - - R/MW-11 B 11/07/08 240 <8.0 <8.0 <8.0 300 <2,000 ' <80 - - R/MW-11 B 02/04/09 450 <8.0 <8.0 <8.0 410 <800 <80 - - AR/MW-11C 05/08/08 81 <0.50 <0.50 <0.50 280 <900 <50 - - R/MW-11C 08/07/08 100 <9.0 <9.0 <9.0 250 <900 <90 - - R/MW-11C 11/07/08 58 <1.5 <1.5 <1.5 120 <150 <50 - - R/MW-11C 02/04/09 36 <1.5 <1.5 <1.5 84 <150 <50 - - R/MW-12A 05/09/08 8.3 <2.0 <2.0 <2.0 33 <200 <50 - - R/MW-12A 08/07/08 6.3 <4.0 <4.0 <4.0 <20 <400 <50 - - R/MW-12A 08/26/08 10 - - - <200 - - - - R/MW-12A 11/06/08 8.3 <2.0 <2.0 <2.0 35 <200 <50 - - R/MW-12A 02/05/09 10 <4.0 <4.0 <4.0 34 <400 <50 - - 1Q09 STTC gwtables.xls Page 3 of 14