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Appendix I Historical 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 (pg/L) (pg/L) (Ng/L) (pg/L) (Ng/L) (Ng/L) (Ng/L) (pg/L) (pg/L) Comments AR/MW-8B 05/09/06 630 <9.0 <9.0 <9.0 <50 <900 <90 AR/MW-8B 08/08/06 2,100 <9.0 <9.0 <9.0 590 <900 <90 AR/MW-8B 10/31/06 2,800 <9.0 <9.0 <9.0 400 <900 <90 AR/MW-8B 01/30/07 5,100 <8.0 <8.0 16 320 <1,500 <80 AR/MW-8B 05/03/07 3,600 <15 <15 <15 360 <2,000 <150 AR/MW-8B 08/01/07 3,200 <20 <20 <20 440 <3,000 <200 AR/MW-8B 10/31/07 3,600 <7.0 <7.0 13 860 <700 <70 AR/MW-8B 02/04/08 -- -- -- -- -- -- -- Well Flooded AR/MW-8B 05/08/08 3,700 <15 <15 <15 2,500 <2,000 <150 AR/MW-8B 08/07/08 3,400 <20 <20 <20 2,100 <2,000 <200 AR/MW-8B 11/07/08 1,800 <15 <15 <15 3,100 <3,000 <150 AR/MW-8B 11/07/08 1,200 <15 <15 <15 2,600 <15,000 <150 QCDup-2 AR/MW-8B 02/06/09 3,100 <15 <15 <15 5,200 <3,000 <150 AR/MW-8B 02/06/09 3,100 <15 <15 <15 5,000 <3,000 <150 QCDup-2 AR/MW-8B 05/07/09 660 <2.5 <2.5 2.6 620 <400 <50 AR/MW-8B 05/07/09 720 <2.5 <2.5 2.6 660 <500 <50 QCDup-2 AR/MW-8B 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-8B 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 02/14/01 <1.0 <1.0 <1.0 <1.0 <5.0 -- -- AR/MW-8C 05/07/01 <1.0 <1.0 <1.0 <1.0 <5.0 AR/MW-8C 08/22/01 3.9 <1.0 <1.0 <1.0 <5.0 AR/MW-8C 10/30/01 2.0 <1.0 <1.0 <1.0 <5.0 AR/MW-8C 02/04/02 19 <5.0 <5.0 <5.0 <10 -- -- -- -- AR/MW-8C 05/03/02 8.0 <2.5 <2.5 <2.5 <25 <100 <250 4.5 <2.5 AR/MW-8C 08/01/02 <10 <10 <10 <10 <100 <1,000 <100 -- -- AR/MW-8C 10/31/02 <10 <10 <10 <10 <100 <1,000 <100 AR/MW-8C 02/27/03 <1.0 <1.0 <1.0 <1.0 12 <100 <10 AR/MW-8C 05/30/03 <2.0 <2.0 <2.0 <2.0 <20 <200 <20 AR/MW-8C 08/08/03 <2.0 <2.0 <2.0 <2.0 <20 <200 <20 AR/MW-8C 11/15/03 <5.0 <5.0 <5.0 <5.0 <50 <500 <50 AR/MW-8C 02/24/04 -- -- -- -- -- -- -- Well Flooded AR/MW-8C 05/24/04 33 <1.0 <1.0 <1.0 17 <100 <10 AR/MW-8C 08/20/04 6.6 <2.5 <2.5 <2.5 <25 <250 <25 1 Q10 STTC gwtables.xlsx Page 11 of 77