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Page 13 of 35 Table 1 Historical Groundwater Gauging and Analytical Results Union Oil Company of California Former 76 Station No.4409/Phillips 66 Site 5862 1502 North El Dorado Street,Stockton,CA Ethyl- Total Sample TOC DTW GWE TPHg Benzene Toluene benzene Xylenes MTBE TBA EDB 1,2-DCA DIPE ETBE TAME Ethanol Well ID Date (ft.amsl) (ft) (ft.amsl) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) (Ng/L) MW-21 02/07/14 12.35 27.83 -15.48 2400 14 32 31 280 1000 1900 <12 -- <12 <12 <12 <6,200 MW-21 09/24/14 12.35 29.54 -17.19 6400 36 16 10 160 850 1600 <5.0 -- <5.0 <5.0 <5.0 <2,500 MW-21 03/18/15 12.35 30.00 -17.65 870 6.5 6.3 8.9 56 670 1800 <0.50 -- <0.50 <0.50 <0.50 <250 MW-21 08/28/15 12.35 31.80 -19.45 1600 33 18 9.1 110 110 <10 <0.50 -- <0.50 <0.50 <0.50 <250 MW-21 03/30/16 12.35 31.13 -18.78 4,500 c 7.8 35 69 290 c 420 c 1400 <0.50 -- <0.50 <0.50 <0.50 <250 MW-21 08/29/16 12.35 31.18 -18.83 7300 38 45 85 210 260 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 03/10/17 12.35 27.32 -14.97 11,000 15 150 330 810 160 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 08/11/17 12.35 25.05 -12.70 9,800 <5.0 130 40 1,100 130 <100 <5.0 <5.0 <5.0 <5.0 <5.0 <2,500 MW-21 02/28/18 12.35 24.63 -12.28 18,000 2 150 190 600 98 450 <1.0 <1.0 <1.0 <1.0 <1.0 <500 MW-21 08/31/18 12.35 23.25 -10.90 5,500 1 95 61 230 42 100 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 03/01/19 12.35 21.69 -9.34 1,100 <0.50 7 4 32 1 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 09/05/19 12.35 19.80 -7.45 2,600 0.87 67 160 110 70 240 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 02/28/20 12.35 19.18 -6.83 4,900 1.0 61 310 160 88 340 <0.50 <0.50 <0.50 <0.50 0.70 <250 MW-21 09/09/20 12.35 20.14 -7.79 4,000 0.92 37 200 120 28 55 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 01/08/21 12.35 20.70 -8.35 4,100 3.6 58 320 170 130 220 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 07/01/21 12.35 21.27 -8.92 8,300 2.0 470 780 1,400 110 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-21 09/03/21 12.35 21.94 -9.59 14,000 2.3 670 1,100 2,000 97 67 <4.0 <2.0 <8.0 <8.0 <8.0 <400 MW-21 12/30/21 12.35 21.54 -9.19 6,100 <2.5 260 460 670 67 <50 <5.0 <2.5 <10 <10 <10 <500 MW-21 03/09/22 12.35 21.14 -8.79 5,500 <4.0 320 550 740 79 <80 <8.0 <4.0 <16 <16 <16 <800 MW-21 09/27/22 12.35 23.25 -10.90 9,100 <4.0 570 970 1,500 85 <80 <8.0 <4.0 <16 <16 <16 <800 MW-24 02/28/20 11.36 18.26 -6.90 870 73 2.6 2.1 4.1 43 83 <0.50 4.8 <0.50 <0.50 <0.50 <250 MW-24 09/09/20 11.36 19.17 -7.81 240 11 0.60 0.57 <1.0 27 <10 <0.50 1.2 <0.50 <0.50 <0.50 <250 MW-24 01/08/21 11.36 19.75 -8.39 <50 4.8 <0.50 <0.50 <1.0 28 <10 <0.50 0.85 <0.50 <0.50 <0.50 <250 MW-24 06/30/21 11.36 20.21 -8.85 110 13 0.19 J <0.50 <1.0 7.7 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-24 09/02/21 11.36 20.95 -9.59 340 42 <1.0 <1.0 <2.0 20 <10 <1.0 <0.50 <2.0 <2.0 <2.0 <100 MW-24 12/29/21 11.36 20.54 -9.18 820 170 2.7 2.0 <2.0 65 58 <1.0 <0.50 <2.0 <2.0 <2.0 <100 MW-24 03/08/22 11.36 20.30 -8.94 390 110 1.8 <1.0 <2.0 48 60 <1.0 <0.50 <2.0 <2.0 <2.0 <100 MW-24 09/27/22 11.36 22.15 -10.79 430 50 <1.0 <1.0 <2.0 51 67 <1.0 <0.50 <2.0 <2.0 <2.0 <100 B Zone MW-5 01/22/01 12.17 28.45 -16.28 840 6.1 15 16 48 11 ND -- -- ND ND ND ND MW-5 04/05/01 12.17 27.88 -15.71 9630 63.5 13.7 224 513 ND ND -- -- ND ND ND ND MW-5 07/05/01 12.17 28.85 -16.68 4000 27 11 140 240 ND ND -- -- ND ND ND ND MW-5 10/10/01 12.17 30.98 -18.81 8100 <10 12 340 560 <100 <100 -- -- <2.0 <2.0 <2.0 <1,000 MW-5 01/17/02 12.17 30.39 -18.22 9000 37 11 260 390 <100 <100 -- -- <5.0 <5.0 <5.0 <2,500 GHD 12594700(1)