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Table 7 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 Identification Date (pg/L) (pg/L) (Ng/L) (pg/L) (Ng/L) (Ng/L) (Ng/L) Comments AR/MW-6AR 05/07/09 31 <2.5 <2.5 <2.5 26 <250 <50 AR/MW-6AR 08/07/09 22 <2.5 <2.5 <2.5 19 <250 <50 AR/MW-6AR 11/06/09 13 <0.50 <0.50 <0.50 7.1 <50 -- AR/MW-6AR 02/03/10 32 <4.0 <4.0 <4.0 21 <400 -- AR/MW-6B 05/06/09 0.67 <0.50 <0.50 <0.50 <5.0 <50 <50 AR/MW-613 08/05/09 0.96 <0.50 <0.50 <0.50 <5.0 <50 <50 AR/MW-613 11/06/09 <0.50 -- -- -- <5.0 <50 <50 AR/MW-6B 02/04/10 1.1 -- -- -- <5.0 <50 <50 AR/MW-8A 05/08/09 6,600 <25 <25 <25 1,200 <4,000 <250 AR/MW-8A 08/07/09 7,600 <25 <25 <25 1,400 <2,500 <250 AR/MW-8A 11/06/09 6,500 <25 <25 <25 1,400 <5,000 <250 AR/MW-8A 02/04/10 6,100 <15 <15 17 1,300 <3,000 ' <150 AR/MW-813 05/07/09 660 <2.5 <2.5 2.6 620 <400 <50 AR/MW-813 05/07/09 720 <2.5 <2.5 2.6 660 <500 <50 QCDup-2 AR/MW-813 2 08/06/09 1,600 <15 <15 <15 850 <1,500 <150 AR/MW-8B 08/06/09 1,300 <2.5 <2.5 4.1 890 <2,000 <50 QCDup-2 AR/MW-813 11/06/09 620 <5.0 <5.0 <5.0 260 <500 <50 AR/MW-8B 11/06/09 490 <5.0 <5.0 <5.0 240 <500 <50 QCDup-2 AR/MW-8B 02/04/10 1,300 <7.0 <7.0 <7.0 400 <1,000 ' <70 AR/MW-8B 02/04/10 1,300 <7.0 <7.0 <7.0 380 <700 <70 QCDup-2 AR/MW-8C 05/07/09 <4.0 <4.0 <4.0 <4.0 <20 <400 <50 AR/MW-8C 08/06/09 <2.5 <2.5 <2.5 <2.5 <15 <250 <50 AR/MW-8C 11/06/09 <2.5 <2.5 <2.5 <2.5 <15 <250 -- AR/MW-8C 02/03/10 <0.50 <0.50 <0.50 <0.50 14 <200 ' AR/MW-9A 05/07/09 120 <0.50 <0.50 1.1 90 <200 <50 AR/MW-9A 08/07/09 180 <2.5 <2.5 <2.5 250 <250 <50 AR/MW-9A 11/05/09 170 <2.5 <2.5 <2.5 320 <250 -- AR/MW-9A 02/05/10 <0.50 <0.50 <0.50 <0.50 <5.0 <50 -- 1 Q1 0 STTC gwtables.xlsx Page 2 of 14