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Page 5 of 25 TaW 1 Historical Groundwater Gauging and Analytical Results Union Oil Company of California Former 76 Station No.4409/Phillips 66 Site 2469 1502 North El Dorado Street,Stockton,CA Ethyl- Total Sample TOC DTW GWE TPH-g Benzene Toluene benzene Xylenes MTBE TBA EDB 1,2-DCA DIPE ETBE TAME Ethanol Comments Well ID Date (ft.amsl) (ft) (ft.amsl) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) MW-3 08/28/16 12.03 31.69 -19.66 - - - - - -- -- - - - - - - MW-3 03/30/16 12.03 31.60 -19.57 <50 <0.50 <0.50 <0.50 <1.0 2.8 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-3 OB/29116 12.03 31.04 -19.01 - - - - - - - - - - - - -- MW-3 03/10/17 12.03 27.15 -15.12 <60 <0.50 <0.50 <0.50 <1.0 3.0 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-3 0B/11/17 12.03 24.79 -12.76 - - - - - - - - - - - - - MW-3 02/26/18 12.03 23.74 -11.71 <50 <0.50 <0.50 <0.50 <1.0 2.4 <10 <0.50 0.55 <0.50 <0.50 <0.50 <250 MW-3 08/31/18 12.03 22.97 -10.94 - - - - - - - - -- - - - - MW-3 03/01/19 12.03 21.42 -9.39 <50 <0.50 <0.50 <0.50 <1.0 3.3 <10 <0.50 0.94 <0.50 <0.50 <0.50 <250 MW-3 09/05/19 12.03 19.87 -7.84 - - - - - - - - -- - - - - MW-3 02/28/20 12.03 18.83 -6.80 <50 <0.50 <0.50 <0.50 <1.0 1.6 <10 <0.50 0.57 <0.50 <0.50 <0.50 <250 MW4 01/05/00 11.49 28.30 -16.81 NO NO NO NO ND 5.0 ND NO ND ND ND NO - MW4 04/10/00 11.49 25.90 -14.41 NO ND NO NO ND 13.6 ND ND ND ND ND NO - MW-4 07/05/00 11.49 25.94 -14.35 ND ND ND NO NO 9.9 ND ND NO NO ND ND - MW-4 10/10/00 11.49 27.87 -16.38 NO ND ND NO ND 15 ND ND NO ND ND ND - MW-4 01/22/01 11.49 27.71 -16.22 ND ND NO NO ND 9.56 ND NO NO ND ND NO ND MW4 W05/01 11.49 27.16 -15.67 ND ND NO NO ND 8.15 ND ND ND ND ND ND ND MW4 07/06/01 11.49 28.08 -16.59 NO ND ND ND ND 7.7 ND NO ND ND ND NO ND MW4 10/10/01 11.49 30.21 -16.72 <50 <0.50 <0.50 <0.50 <0.50 6.4 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <1,000 MW4 01/17/02 11.49 29.66 -18.17 <50 <0.50 <0.50 <0.50 <0.50 6.0 <20 <1.0 <1.0 <1.0 <1.0 0.0 <500 MW4 04/18/02 11.49 28.91 -17.42 <50 <0.50 <0.50 <0.50 <0.50 7.3 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW-4 07/11/02 11.49 29.94 -18.45 <50 <0.50 <0.50 <0.50 0.0 4.9 <5.0 <0.50 <0.50 <1.0 <0.50 <0.50 <25 MW4 11/14/02 11,49 32.76 -21.27 <50 <0.50 <0.50 <0.50 <1.0 2.7 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW4 01/30/03 11.49 31.93 -20.44 <50 <0.50 <0.50 <0.50 <1.0 3.7 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW4 04/28/03 11.49 31.11 -19.62 <50 <0.50 <0.50 <0.50 <1.0 8.9 <1D0 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW4 07/28/03 11.49 32.55 -21.06 <50 <0.50 <0.50 <0.50 <1.0 15 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW4 10/08/03 11.49 34.11 -22.62 62 <0.50 <0.50 <0.50 1.8 31 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW4 01/12/04 11.49 33.56 -22.07 56 <0.50 <0.50 0.55 0.0 65 <100 <2.0 2.2 <2.0 <2.0 <2.0 <500 MW-4 04/26/04 11.49 32.11 -20.62 64 0.67 0.67 1.2 1.7 57 <5.0 <0.50 1.2 <1.0 <0.50 <0.50 <50 _ MW-4 07/13/04 11.49 33.35 -21.86 140 <0.50 <0.50 <0.50 <1.0 190 <5.0 <0.50 3.8 0.0 <0.50 <0.50 <50 MW-4 10/26/04 11.49 35.37 -23.8B 140 <0.50 <0.50 <0.50 <1.0 180 <5.0 <0.50 4.5 <1.0 <0.50 <0.50 <50 MW-4 01/12/05 11.49 34.76 -23.27 460 <0.50 <0.50 0.71 1.2 430 66 <2.0 7.2 <4.0 <2.0 <2.0 <200 MW4 D4/12105 11.49 32.30 -20.81 460 <0.50 <0.50 <0.50 <1.0 440 <5.0 <0.50 6.5 <0.50 <0.50 <0.50 <50 MW-4 07/12/05 11.49 31.48 -19.99 270 <0.50 <0.50 <0.50 <1.0 460 <20 <2.0 6.3 <2.0 <2.0 <2.0 <200 MW4 10/06/05 11.49 32.96 -21.47 270 <0.50 <0.50 <0.50 0.0 730 <5.0 <0.50 9.0 <0.50 <0.50 <0.50 <50 MW4 01/12/06 11.49 31.86 -20.37 820 <0.50 <0.50 <0.50 <1.0 970 100 - 7.6 <0.50 <0.50 <0.50 <250 MW4 04/12/06 11.49 29.78 -18.29 510 <0,50 <0.50 <0.50 0.0 660 290 - 6.5 <0.50 <0.50 0.91 <250 MW4 07/10/06 11,49 28.00 -16.51 400 <5.0 <5.0 <5.0 <10 240 260 - <5.0 <0.50 <0.50 <5.0 <250 MW4 10/18/06 11.49 29.22 -17.73 120 <5.0 <5.0 <5.0 <10 96 760 - 4.0 <0.50 <0.50 <5.0 <250 MW4 03/12/07 11.49 27.86 -16.37 <0.50 <0.50 <0.50 <0.50 <0.50 <0.50 250 - 1.9 <0.50 <0.50 <D.50 <250 MW4 05/15/07 11.49 28.22 -16.73 <50 <0.50 <0.50 <0.50 <0.50 24 540 <0.50 2.4 <0.50 <0.50 <0.50 <250 MW4 OS/01/07 11.49 28.84 -17.35 <50 <0.50 <0.50 <0.50 <0.50 12 600 <0.50 2.7 <0.50 <0.50 <0.50 <250 MW4 11/19/07 11.49 29.70 -18.21 <50 <0.50 <0.50 <0.50 <0.50 11 220 <0.50 1.3 <0.50 <0.50 <0.50 <250 GHD 11193145(5)