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-1B 08/06/09 93 2.8 <0.50 0.64 1,500 AR/MW-1B 11/05/09 120 2.3 <0.50 0.79 1,600 AR/MW-1B 02/03/10 160 2.6 -- 0.95 1,800 -- -- -- - AR/MW-2A 08/26/08 <5.0 -- -- <100 AR/MW-3A 11/13/03 1,100 -- AR/MW-3A 02/24/04 -- Well Flooded AR/MW-3A 05/26/04 580 AR/MW-3A 08/23/04 450 AR/MW-3A 11/18/04 610 AR/MW-3A 02/14/05 - Well Flooded AR/MW-3A 05/20/05 160 AR/MW-3A 09/02/05 180 AR/MW-3A 11/29/05 240 AR/MW-3A 02/06/06 - Well Flooded AR/MW-3A 05/12/06 170 ---- ---- ---- ---- ---- ---- AR/MW-3A 08/08/06 140 AR/MW-3A 10/31/06 240 AR/MW-3A 01/30/07 300 AR/MW-3A 05/03/07 280 -- -- -- -- -- -- AR/MW-3A 08/02/07 240 <15 <15 <15 380 <1,500 <150 AR/MW-3A 11/01/07 360 <15 <15 <15 300 <1,500 <150 AR/MW-3A 02/04/08 -- -- -- -- -- -- -- Well Flooded AR/MW-3A 05/09/08 88 <15 <15 <15 210 <1,500 <150 AR/MW-3A 06/25/08 <50 -- -- -- <1,000 -- -- AR/MW-3A 08/07/08 160 <15 <15 <15 320 <1,500 <150 AR/MW-3A 11/06/08 100 <15 <15 <15 4,500 <1,500 <4,000 AR/MW-3A 02/05/09 100 <15 <15 <15 2,700 <1,500 <150 AR/MW-3A 05/08/09 43 <15 <15 <15 1,400 <1,500 <150 AR/MW-3A 08/07/09 120 <15 <15 <15 1,700 <1,500 <150 AR/MW-3A 11/06/09 37 <15 <15 <15 1,200 <1,500 <150 AR/MW-3A 02/04/10 21 <15 <15 <15 590 <1,500 <150 -- AR/MW-5A 02/14/01 13,000 <170 <170 <170 <850 -- -- AR/MW-5A 08/22/01 18,000 <200 <200 <200 <1,000 AR/MW-5A 02/04/02 33,000 <5,000 <5,000 <5,000 <10,000 -- -- AR/MW-5A 05/03/02 41,000 <50 <50 550 2,000 1,100 <5,000 90 <50 1 Q10 STTC gwtables.xlsx Page 3 of 77