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 OW-51D 05/29/03 <0.50 <0.50 <0.50 <0.50 22 <50 <5.0 OW-51D 08/07/03 <0.50 <0.50 <0.50 <0.50 27 <50 <5.0 OW-51D 11/10/03 <0.50 <0.50 <0.50 <0.50 11 <50 <5.0 OW-51D 03/04/04 <0.50 <0.50 <0.50 <0.50 13 <50 <5.0 OW-51D 05/19/04 <0.50 <0.50 <0.50 <0.50 20 <50 <5.0 OW-51D 08/20/04 <0.50 <0.50 <0.50 <0.50 13 <50 <5.0 OW-51D 11/17/04 <0.50 <0.50 <0.50 <0.50 10 <50 <5.0 OW-51D 02/16/05 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 OW-51D 05/18/05 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 OW-51D 09/02/05 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 OW-51D 12/02/05 <0.50 <0.50 <0.50 <0.50 14 <50 <5.0 OW-51D 02/08/06 <0.50 -- -- -- 7.6 -- -- OW-51D 05/12/06 <0.50 19 OW-51D 08/09/06 <0.50 32 OW-51D 11/02/06 <0.50 33 OW-51D 01/31/07 <0.50 14 OW-51D 05/03/07 <0.50 -- -- -- 18 -- -- OW-51D 07/31/07 <0.50 <0.50 <0.50 <0.50 20 <50 <50 OW-51D 11/01/07 <0.50 <0.50 <0.50 <0.50 18 <50 <50 OW-51D 02/07/08 <0.50 <0.50 <0.50 <0.50 12 <50 <50 OW-51D 05/07/08 <0.50 <0.50 <0.50 <0.50 20 <50 <50 OW-51D 08/06/08 0.82 <0.50 <0.50 <0.50 16 <200 <50 OW-51D 11/04/08 0.70 <0.50 <0.50 <0.50 10 <80 <50 OW-51D 02/04/09 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <50 OW-51D 05/04/09 <0.50 <0.50 <0.50 <0.50 5.6 <50 <50 OW-51D 08/05/09 <0.50 <0.50 <0.50 <0.50 6.6 -- -- OW-51D 11/04/09 <0.50 -- -- -- 5.7 OW-511) 02/03/10 <0.50 -- <5.0 -- -- OW-81D 12/02/05 <0.50 0.80 <0.50 <0.50 72 <50 <5.0 OW-81D 02/07/06 <0.50 -- -- -- -- -- -- OW-81D 05/11/06 <2.0 OW-81D 08/10/06 1.5 OW-81D 11/02/06 <0.90 OW-81D 01/31/07 <0.90 OW-81D 05/04/07 <4.0 -- -- -- -- -- -- OW-81D 08/03/07 <0.50 0.97 <0.50 <0.50 92 <50 <50 OW-81D 11/01/07 <0.50 1.0 <0.50 <0.50 91 <50 <50 1 Q10 STTC gwtables.xlsx Page 46 of 77