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-12A 08/29/05 -- -- -- -- -- -- -- SPH Sheen observed AR/MW-12A 11/29/05 44 <3.0 <3.0 <3.0 59 <300 <30 AR/MW-12A 02/08/06 28 <4.0 <4.0 <4.0 71 <400 <100 AR/MW-12A 05/08/06 26 <4.0 <4.0 <4.0 86 <400 <50 AR/MW-12A 08/08/06 18 <4.0 <4.0 <4.0 74 <400 <50 AR/MW-12A 10/31/06 15 <4.0 <4.0 <4.0 60 <400 <50 AR/MW-12A 01/31/07 15 <1.5 <1.5 <1.5 47 <150 <50 AR/MW-12A 05/03/07 12 <1.5 <1.5 <1.5 46 <150 <50 AR/MW-12A 07/31/07 11 <2.0 <2.0 <2.0 50 <200 <50 AR/MW-12A 10/29/07 -- -- -- -- -- -- -- Not sampled due to SPH AR/MW-12A 02/06/08 12 <2.5 <2.5 <2.5 32 <250 <50 AR/MW-12A 05/09/08 8.3 <2.0 <2.0 <2.0 33 <200 <50 AR/MW-12A 08/07/08 6.3 <4.0 <4.0 <4.0 <20 <400 <50 AR/MW-12A 08/26/08 10 -- -- -- <200 -- -- AR/MW-12A 11/06/08 8.3 <2.0 <2.0 <2.0 35 <200 <50 AR/MW-12A 02/05/09 10 <4.0 <4.0 <4.0 34 <400 <50 AR/MW-12A 05/08/09 11 <4.0 <4.0 <4.0 44 <500 <50 AR/MW-12A 08/06/09 9.0 <1.5 <1.5 <1.5 31 <150 <50 AR/MW-12A 11/05/09 11 <2.5 <2.5 <2.5 34 <250 -- AR/MW-12A 02/05/10 9.4 <1.5 <1.5 <1.5 25 <150 -- -- -- AR/MW-12B 02/14/01 <1.0 <1.0 <1.0 <1.0 <5.0 -- AR/MW-12B 08/22/01 <1.0 <1.0 <1.0 <1.0 <5.0 AR/MW-126 02/05/02 <2.0 <5.0 <5.0 <5.0 <10 AR/MW-12B 05/01/02 -- -- -- -- -- -- -- SA(1,3) AR/MW-12B 08/01/02 <0.50 <0.50 <0.50 <0.50 <5.0 <100 <20 AR/MW-12B 10/28/02 -- -- -- -- -- -- -- SA(1,3) AR/MW-12B 02/25/03 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 AR/MW-126 05/27/03 -- -- -- -- -- -- -- SA(1,3) AR/MW-12B 08/08/03 <0.50 <0.50 <0.50 <0.50 <5.0 <50 <5.0 AR/MW-12B 11/03/03 -- -- -- -- -- -- -- SA(1,3) AR/MW-12B 02/25/04 <0.50 AR/MW-12B 05/17/04 -- SA(1,3) AR/MW-12B 08/20/04 <0.50 AR/MW-12B 11/15/04 -- SA(1,3) AR/MW-12B 02/17/05 <0.50 AR/MW-12B 05/16/05 - SA(1,3) AR/MW-12B 08/31/05 <0.50 1 Q10 STTC gwtables.xlsx Page 19 of 77