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) (lag/L) (pg/L) (lag/L) (lag/L) (lag/L) (pg/L) (pg/L) Comments SP/WC-1S 05/17/04 -- SA(1,3) SP/WC-1S 08/19/04 0.60 SP/WC-1S 11/15/04 -- SA(1,3) SP/WC-1S 02/15/05 0.62 SP/WC-1S 05/16/05 -- SA(1,3) SP/WC-1S 08/31/05 0.61 SP/WC-1S 02/07/06 0.51 SP/WC-1S 05/08/06 <0.50 SP/WC-1S 08/10/06 0.84 SP/WC-1S 10/30/06 -- SA(1,3) SP/WC-1S 01/30/07 0.71 SP/WC-1S 05/01/07 -- SA(1,3) SP/WC-1S 08/01/07 0.73 <0.50 <0.50 <0.50 <5.0 <50 <50 SP/WC-1S 10/29/07 -- -- -- -- -- -- -- SA(1,3) SP/WC-1S 02/05/08 0.54 <0.50 <0.50 <0.50 <5.0 <50 <50 SP/WC-1S 05/05/08 -- -- -- -- -- -- -- SA(1,3) SP/WC-1S 08/05/08 0.77 <0.50 <0.50 <0.50 <5.0 <50 <50 SP/WC-1S 11/03/08 -- -- -- -- -- -- -- SA(1,3) SP/WC-1S 02/03/09 0.56 <0.50 <0.50 <0.50 <5.0 SP/WC-1S 05/04/09 -- -- -- -- -- SA(1,3) SP/WC-1S 08/04/09 1.0 SP/WC-1S 11/02/09 - SA(1,3) SP/Wc-1S 02/04/10 <0.50 -- --TIME OIL TO/MW-1 05/01/02 -- SPH Sheen observed TO/MW-1 07/29/02 -- -- -- -- -- -- -- SPH Sheen observed TO/MW-1 10/31/02 <100 <100 <100 <100 <1,000 <10,000 <1,000 TO/MW-1 02/24/03 -- -- -- -- -- -- -- Well Flooded TO/MW-1 05/28/03 <10 <10 <10 <10 <100 <1,000 <200 TO/MW-1 08/04/03 -- -- -- -- -- -- -- SPH Sheen observed TO/MW-1 11/03/03 SPH Sheen observed TO/MW-1 02/24/04 Well Flooded TO/MW-1 05/24/04 <2.0 <2.0 <2.0 <2.0 <20 <500 <20 TO/MW-1 08/17/04 -- -- -- -- -- -- -- SPH Sheen observed TO/MW-1 11/18/04 <3.0 <3.0 <3.0 <3.0 <50 <500 <50 TO/MW-1 02/14/05 -- -- -- -- -- -- -- Well Flooded TO/MW-1 05/16/05 Well Flooded 1 Q10 STTC gwtables.xlsx Page 49 of 77