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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 TS-9 05/01/07 -- -- -- -- -- -- -- SA(1,3) TS-9 08/02/07 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 TS-9 10/29/07 -- -- -- -- -- -- -- SA(1,3) TS-9 02/05/08 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 TS-9 05/05/08 -- -- -- -- -- -- -- SA(1,3) TS-9 08/06/08 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 TS-9 11/03/08 -- -- -- -- -- -- -- SA(1,3) TS-9 02/04/09 <0.50 <0.50 <0.50 <0.50 6.5 TS-9 05/04/09 -- -- -- -- -- SA(1,3) TS-9 08/06/09 <0.50 <0.50 <0.50 <0.50 <5.0 TS-9 11/02/09 -- -- -- -- -- SA(1,3) TS-9 02/02/10 <0.50 -- <5.0 -- -- TS-10 05/11/01 4,300 <100 <100 <100 <500 TS-10 08/29/01 20,000 <500 <500 <500 <2,500 TS-10 11/06/01 19,000 <500 <500 <500 <2,500 TS-10 02/07/02 820 <100 <100 <100 <200 -- -- TS-10 05/02/02 1,100 <10 <10 <10 230 <100 <1,000 <10 <10 TS-10 07/30/02 1,800 <2.5 <2.5 7.9 470 <500 <25 -- -- TS-10 10/29/02 2,000 <5.0 <5.0 7.4 510 <3,000 <50 TS-10 02/25/03 150 <0.50 <0.50 0.93 19 <50 <5.0 TS-10 05/28/03 240 <0.50 <0.50 0.85 38 <50 <5.0 TS-10 08/04/03 700 <0.50 <0.50 2.7 120 <200 <5.0 TS-10 11/03/03 -- -- -- -- -- -- -- Well Casing Damaged TS-10 02/27/04 40 <0.50 <0.50 <0.50 <5.0 <50 <5.0 TS-10 05/21/04 89 <0.50 <0.50 <0.50 15 <50 <5.0 TS-10 08/17/04 97 <0.50 <0.50 <0.50 22 <50 <5.0 TS-10 11/18/04 36 <0.50 <0.50 <0.50 7.2 <50 <5.0 TS-10 02/16/05 4.8 <0.50 <0.50 <0.50 <5.0 <50 <5.0 TS-10 05/17/05 5.2 <0.50 <0.50 <0.50 <5.0 <50 <5.0 TS-10 09/02/05 29 <0.50 <0.50 <0.50 6.2 <50 <5.0 TS-10 12/02/05 43 <0.50 <0.50 <0.50 7.2 <50 <5.0 TS-10 02/07/06 2.6 -- -- -- <5.0 -- -- TS-10 05/09/06 2.0 <5.0 TS-10 08/08/06 19 <5.0 TS-10 11/01/06 31 -- TS-10 01/30/07 20 TS-10 05/01/07 5.9 1 Q10 STTC gwtables.xlsx Page 67 of 77