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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 PS/MW-18 08/01/07 14 <0.50 <0.50 <0.50 44 <50 <50 PS/MW-18 11/01/07 29 <0.50 <0.50 <0.50 92 <50 <50 PS/MW-18 02/07/08 6.2 <0.50 <0.50 <0.50 33 <50 <50 PS/MW-18 05/07/08 5.4 <0.50 <0.50 <0.50 290 <50 <50 PS/MW-18 08/05/08 59 <0.50 <0.50 <0.50 320 -- -- PS/MW-18 11/04/08 170 <0.50 <0.50 0.64 540 PS/MW-18 02/04/09 5.2 <0.50 <0.50 <0.50 <5.0 PS/MW-18 05/06/09 4.7 <0.50 <0.50 <0.50 10 PS/MW-18 08/04/09 130 <0.50 <0.50 0.67 500 PS/MW-18 11/03/09 52 -- -- <0.50 300 PS/MW-18 02/02/10 7.7 -- -- <0.50 22 -- -- PS/MW-20 02/14/01 <1.0 <1.0 <1.0 <1.0 <5.0 PS/MW-20 02/06/02 <2.0 <5.0 <5.0 <5.0 <10 PS/MW-20 05/01/02 -- -- -- -- -- A(1) PS/MW-20 07/29/02 A(1) PS/MW-20 10/28/02 A(1) PS/MW-20 02/24/03 A(3) PS/MW-20 06/25/03 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 PS/MW-20 08/06/03 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 PS/MW-20 11/11/03 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 PS/MW-20 03/02/04 <0.50 -- -- -- -- -- -- PS/MW-20 05/18/04 0.54 PS/MW-20 08/19/04 <0.50 PS/MW-20 11/16/04 0.55 PS/MW-20 02/15/05 1.6 PS/MW-20 05/19/05 1.6 PS/MW-20 08/31/05 3.6 PS/MW-20 12/02/05 4.8 PS/MW-20 02/08/06 4.2 PS/MW-20 05/09/06 2.2 PS/MW-20 08/10/06 3.0 PS/MW-20 11/02/06 2.5 PS/MW-20 01/30/07 2.6 PS/MW-20 05/02/07 1.6 -- -- -- -- -- -- PS/MW-20 07/31/07 1.6 <0.50 <0.50 <0.50 <5.0 <50 <50 PS/MW-20 10/31/07 2.0 <0.50 <0.50 <0.50 <5.0 <50 <50 PS/MW-20 02/04/08 -- -- -- -- -- -- -- Unable to locate-well buried 1 Q10 STTC gwtables.xlsx Page 34 of 77