SITE INFORMATION AND CORRESPONDENCE_PRE 2019

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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/MW-1C 11/05/09 220 580 <300 TS/MW-1C 02/03/10 210 -- -- -- 570 <400 -- TS/MW-1D 08/29/01 <1.0 <1.0 <1.0 <1.0 <5.0 -- TS/MW-1D 11/06/01 <1.0 <1.0 <1.0 <1.0 <5.0 TS/MW-1D 02/08/02 <2.0 <5.0 <5.0 <5.0 <10 -- TS/MW-1D 05/01/02 1.9 <0.50 <0.50 <0.50 22 <100 <50 2.8 <0.50 TS/MW-1D 07/30/02 2.3 <0.50 <0.50 <0.50 24 <50 <5.0 -- -- TS/MW-1D 10/29/02 4.0 <0.50 <0.50 <0.50 88 <50 <5.0 TS/MW-1D 02/25/03 2.5 <0.50 <0.50 <0.50 20 <50 <5.0 TS/MW-1D 05/28/03 8.1 <0.50 <0.50 <0.50 78 <50 <5.0 TS/MW-1D 08/05/03 7.6 <1.0 <1.0 <1.0 64 <100 <10 TS/MW-1D 11/04/03 7.2 <0.50 <0.50 <0.50 50 <50 <5.0 TS/MW-1D 02/26/04 5.5 <0.50 <0.50 <0.50 34 <50 <5.0 TS/MW-1D 05/24/04 12 <5.0 <5.0 <5.0 87 <500 <50 TS/MW-1D 08/18/04 11 <2.0 <2.0 <2.0 73 <200 <20 TS/MW-1D 11/18/04 9.5 <0.50 <0.50 <0.50 71 <50 <5.0 TS/MW-1D 02/17/05 4.7 <0.50 <0.50 <0.50 46 <50 <5.0 TS/MW-1D 05/17/05 5.3 <0.50 <0.50 <0.50 <5.0 <50 <5.0 TS/MW-1D z 09/02/05 3.3 <0.50 <0.50 <0.50 12 <50 <5.0 TS/MW-1D 12/22/05 2.1 <0.50 <0.50 <0.50 14 <50 <5.0 TS/MW-1D 02/07/06 2.6 -- -- -- 14 -- -- TS/MW-1D 05/09/06 <0.50 <5.0 TS/MW-1D 08/07/06 1.4 5.2 TS/MW-1D 11/02/06 3.5 17 TS/MW-1D 01/30/07 3.2 5.1 TS/MW-1D 05/01/07 3.0 -- -- -- 5.3 -- -- TS/MW-1D 08/02/07 4.3 <0.50 <0.50 <0.50 22 <50 <50 TS/MW-1D 10/31/07 4.4 <0.50 <0.50 <0.50 <5.0 <50 <50 TS/MW-1D 02/05/08 2.4 <0.50 <0.50 <0.50 <5.0 <50 <50 TS/MW-1D 05/07/08 4.7 <0.50 <0.50 <0.50 5.4 <50 <50 TS/MW-1D 08/07/08 3.5 <0.50 <0.50 <0.50 23 -- -- TS/MW-1D 2 11/07/08 2.0 <0.50 <0.50 <0.50 <5.0 T MW-1D 02/04/09 1.2 <0.50 <0.50 <0.50 <5.0 TS/MW-1D 05/07/09 1.2 <0.50 <0.50 <0.50 <5.0 TS/MW-1D 08/06/09 1.7 <0.50 <0.50 <0.50 11 1 Q10 STTC gwtables.xlsx Page 74 of 77