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 AR/MW-14D 11/05/08 4.3 <0.50 <0.50 <0.50 42 AR/MW-14D 02/03/09 1.1 <0.50 <0.50 <0.50 13 AR/MW-14D 05/05/09 2.0 <0.50 <0.50 <0.50 13 AR/MW-14D 08/04/09 3.3 <0.50 <0.50 <0.50 13 AR/MW-14D 11/03/09 0.82 -- -- -- 11 AR/MW-14D 02/05/10 1.8 -- 7.6 -- -- AR/MW-1 8B -AR/MW-18B 10/31/02 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 AR/MW-186 02/25/03 <0.50 -- -- -- -- -- -- AR/MW-18B 06/04/03 <5.0 AR/MW-18B 08/11/03 <0.50 AR/MW-18B 11/05/03 <0.50 AR/MW-18B 03/01/04 <0.50 AR/MW-18B 05/19/04 <0.50 AR/MW-18B 08/20/04 <0.50 AR/MW-18B 11/16/04 <0.50 AR/MW-18B 02/16/05 <0.50 AR/MW-18B 05/19/05 <0.50 AR/MW-18B 08/30/05 <0.50 -- -- -- -- -- -- AR/MW-18B 11/30/05 <0.50 <0.50 <0.50 <0.50 8.2 <50 <5.0 AR/MW-18B 02/08/06 <0.50 -- -- -- -- -- -- AR/MW-18B 05/11/06 <0.50 7.2 AR/MW-18B 08/10/06 <0.50 6.0 AR/MW-186 11/02/06 <0.50 5.7 AR/MW-18B 01/31/07 <0.50 <5.0 AR/MW-18B 05/03/07 <0.50 -- -- -- <5.0 -- -- AR/MW-18B 08/02/07 1.8 <0.50 <0.50 <0.50 5.2 270 <50 AR/MW-18B 11/01/07 2.0 <0.50 <0.50 <0.50 7.4 <50 <50 AR/MW-186 02/07/08 0.63 <0.50 <0.50 <0.50 9.4 <50 <50 AR/MW-18B 05/06/08 0.71 <0.50 <0.50 <0.50 9.8 <50 <50 AR/MW-18B 08/05/08 0.59 <0.50 <0.50 <0.50 9.7 <50 <50 AR/MW-18B 11/05/08 0.57 <0.50 <0.50 <0.50 13 -- -- AR/MW-18B 02/03/09 1.4 <0.50 <0.50 <0.50 31 AR/MW-186 2 05/07/09 1.4 <0.50 <0.50 <0.50 36 AR/MW-18B 08/04/09 1.8 <0.50 <0.50 <0.50 39 AR/MW-18B 11/03/09 1.7 -- -- -- 49 AR/MW-18B 02/02/10 1.5 -- 44 -- 1 Q10 STTC gwtables.xlsx Page 26 of 77