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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/WC-1M 11/01/07 35 <0.50 <0.50 <0.50 20 <50 <50 PS/WC-1M 02/06/08 6.3 <0.50 <0.50 <0.50 5.1 <50 <50 PS/WC-1M 05/08/08 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 PS/WC-1M 08/05/08 8.3 <0.50 <0.50 <0.50 <5.0 -- -- PS/WC-1M 11/04/08 <0.50 <0.50 <0.50 <0.50 <5.0 PS/WC-1M 02/04/09 <0.50 <0.50 <0.50 <0.50 <5.0 PS/WC-1M 05/05/09 0.92 <0.50 <0.50 <0.50 <5.0 PS/WC-1M 08/04/09 1.2 <0.50 <0.50 <0.50 <5.0 PS/WC-1M 11/03/09 <0.50 -- -- -- <5.0 Ps/Wc-1M 02/02/10 <0.50 -- <5.0 -- PS/WC-1S 02/19/01 <1.0 <1.0 <1.0 <1.0 <5.0 PS/WC-1S 08/24/01 <1.0 <1.0 <1.0 <1.0 <5.0 PS/WC-1S 02/06/02 <2.0 <5.0 <5.0 <5.0 <10 PS/WC-1S 05/01/02 -- -- -- -- -- -- -- SA(1,3) PS/WC-1S 07/30/02 <0.50 <0.50 <0.50 <0.50 <5.0 <90 <15 PS/WC-1S 10/28/02 -- -- -- -- -- -- -- SA(1,3) PS/WC-1S 02/26/03 0.81 PS/WC-1S 06/04/03 <5.0 PS/WC-1S 08/07/03 <0.50 PS/WC-1S 11/04/03 <0.50 PS/WC-1S 02/26/04 <0.50 PS/WC-1S 05/18/04 <0.50 PS/WC-1S 08/19/04 <0.50 PS/WC-1S 11/16/04 <0.50 PS/WC-1S 02/15/05 <0.50 PS/WC-1S 05/16/05 -- Unable to access PS/WC-1S 08/31/05 <0.50 PS/WC-1S 12/02/05 <0.50 PS/WC-1S 02/08/06 <0.50 PS/WC-1S 05/09/06 <0.50 PS/WC-1S 08/10/06 <0.50 PS/WC-1S 11/02/06 <0.50 PS/WC-1S 01/30/07 <0.50 PS/WC-1S 05/02/07 <0.50 -- -- -- -- -- -- PS/WC-1S 07/31/07 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 PS/WC-1S 10/31/07 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 PS/WC-1S 02/07/08 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 1 Q10 STTC gwtables.xlsx Page 38 of 77