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Page 6 of 25 Table 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.amsp (ft) (ft.amsi) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) MW-4 01/22/08 11.47 28.73 -17.26 6,300 <0.50 <0.50 130 140 3,000 1,200 <0.50 5.4 <0.50 <0.50 3.7 <250 MW-4 04/07/08 11.47 27.83 -16.36 <50 <0.50 <0.50 <0.50 <1.0 12 300 <0.50 1.6 <0.50 <0.50 <0.50 <250 MW-4 07/21/08 11.47 29.20 -17.73 <50 <0.50 <0.50 <0.5D <1.0 19 440 <0.50 1.2 <0.50 <0.50 <0.50 <250 MW-4 10/20/08 11.47 30.67 -19.20 <50 <0.50 <0.50 <0.50 <1.0 30 130 <0.50 0.79 <0.50 <0.50 <0.50 <250 MW-4 01/19/09 11.47 31.01 -19.54 67 <0.50 <0.50 <0.50 <1.0 79 140 <0.50 0.89 <0.50 <0.50 <0.50 <250 MW-4 04/20/09 11.47 30.32 -18.85 160 <0.50 <0.50 <0.50 <1.0 120 68 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 07/20/09 11.47 31.20 -19.73 200 <0.50 <0.50 <0.50 <1.0 170 50 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 01/04/10 11.47 31.87 -20.40 110 <0.50 <0.50 <0.50 <1.0 99 75 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 07/19/10 11.47 29.19 -17.72 - - - - - - - - - - - - - MW4 01/05/11 11.47 29.21 -17.74 55 <0.50 <0.50 <0.50 <1.0 26 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW4 08/02/11 11.47 27.06 -15.59 - - - - - - - - - - - - - MW-4 03/27/12 11.47 26.02 -14.55 <50 <0.50 <0.50 <0.50 <1.0 15 <10 <0.50 <0.50 <0.50 <0.5D <0.50 <250 MW-4 09/04/12 11.47 26.59 -15.12 - - - - - - - - - - - - _ MW4 02/25/13 11.47 25.35 -13.88 <50 <0.50 <0.50 <0.50 <1.0 6.2 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 08/13/13 11.47 26.35 -14.88 - - - MW4 02/07/14 11.47 28.04 -16.57 <50 <0.50 <0.50 <0.50 <1.0 8.3 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW4 09/24/14 11.47 28.41 -16.94 - - - - - - - - - - - - - MW-4 03/18/15 11.47 28.86 -17.39 <50 <0.50 <0.50 <0.50 <1.0 5.9 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 08/28/15 11.47 30.66 -19.19 - - - - - - - - - - - _ _ MW-4 D3/30/16 11.47 30.02 -18.55 <50 <0.50 <0.50 <D.50 <1.0 3.8 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 08/29/16 11.47 30.05 -18.58 - - - MW4 03/10/17 11.47 26.20 -14.73 <50 <0.50 <0.50 <0.50 0.0 3.4 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-4 08/11/17 11.47 23.91 -12.44 - - - - - - - - - - - - - MW-4 02/28/18 11.47 22.91 -11.44 <50 <0.50 <0.50 <0.50 0.0 2.6 <10 <0.50 3.3 <0.50 <0.50 <0.50 <250 MW4 08/31/18 11.47 22.15 -10.68 - - - - - - - - - - - - - MW4 03/01/19 11.47 20.55 -9.08 <50 <0.50 <0.50 <0.50 0.0 6.2 <10 <0.50 6.6 <0.50 <0.50 <0.50 <250 MW4 09/05/19 11.47 18.72 -7.25 - - - - - - - - - - _ _ - MW-4 02/28/20 11.47 18.08 -6.61 <50 <0.50 <0.50 <0.50 0.0 4.6 <10 <0.50 3.3 <0.50 <0.50 <0.50 <250 MW5 01/22/01 12.17 28.45 -16.28 840 6.1 15 16 48 11 ND ND ND ND ND NO ND MW5 04/05/01 12.17 27.88 -15.71 9,630 63.5 13.7 224 513 ND ND ND NO ND ND NO NO MW-5 07/05/01 12.17 28.85 -16.68 4,000 27 11 140 240 ND ND NO ND ND ND NO ND MW5 10/10/01 12.17 30.98 -18.81 8,100 <10 12 340 560 <100 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <1,000 MW5 01/17/02 12.17 30.39 -18.22 9,000 37 11 260 390 <100 <100 <5.0 6.6 <5.0 <5.0 <5.0 <2,500 MW-5 04/18/02 12.17 29.66 -17.49 7,300 46 11 270 430 <100 <200 <4.0 6.8 <4.0 <4.0 <4.0 <1,000 MW-5 07/11/02 12.17 30.74 -18.57 10,000 4.8 5.6 430 690 <8.0 <20 <2.0 6.3 <4.0 <2.0 <2.0 <100 MW5 11/14/02 12.17 33.54 -21.37 2,500 2.7 3.5 120 220 <2.0 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW5 01/30/03 12.17 32.68 -20.51 1,500 <2.5 <2.5 37 67 <10 <500 <10 <10 <10 <10 <10 <2,500 MW5 D4/28/03 12.17 31.85 -19.68 3,100 2.9 2.9 120 160 <10 <500 <10 <10 <10 <10 <10 <2,500 MW5 07/28/03 12.17 33.33 -21.16 8,400 <5.0 <5.0 280 610 <20 <1,000 <20 <20 <20 <20 <20 <5,000 MW5 10/08/03 12.17 34.94 -22.77 2,100 <2.5 <2.5 <2.5 63 <10 <500 <10 <10 <10 <10 <10 <2,500 MW-5 01/12/04 12.17 34.31 -22.14 4,800 <5.0 <5.0 270 550 <20 <1,000 <20 <20 <20 <20 <2D <5,000 MW-5 04/26/04 12.17 32.88 -20.71 5,100 <2.5 <2.5 260 510 7.7 <25 <2.5 <2.5 <5.0 <2.5 <2.5 <250 GHD 11193145(5)