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Page 15 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-5 02/25/13 12.17 26.28 -14.11 640 <0.50 <0.50 3 60 110 340 <0.50 -- <0.50 <0.50 <0.50 <250 MW-5 08/13/13 12.17 27.30 -15.13 1700 <0.50 <0.50 5.9 130 120 450 <0.50 -- <0.50 <0.50 <0.50 <250 MW-5 02/07/14 12.17 27.65 -15.48 1500 <0.50 <0.50 6.8 170 180 1200 <0.50 -- <0.50 <0.50 <0.50 <250 MW-5 09/24/14 12.17 29.54 -17.37 2200 <0.50 <0.50 6.6 130 270 1400 <0.50 -- <0.50 <0.50 <0.50 <250 MW-5 03/18/15 12.17 29.82 -17.65 850 <0.50 <0.50 2.1 64 170 630 <0.50 <0.50 <0.50 <0.50 <250 MW-5 08/28/15 12.17 31.64 -19.47 2000 <0.50 <0.50 5.5 68 610 <10 <0.50 <0.50 <0.50 <0.50 <250 MW-5 03/30/16 12.17 30.94 -18.77 2,200 c <0.50 <0.50 1.1 36 59 <10 <0.50 <0.50 <0.50 <0.50 <250 MW-5 08/29/16 12.17 31.02 -18.85 2000 <0.50 <0.50 4.1 46 85 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-5 10/29/16 12.17 31.46 -19.29 -- -- -- -- -- -- -- -- -- -- -- -- -- MW-5 03/10/17 12.17 27.10 -14.93 1,500 <0.50 <0.50 1.0 25 70 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-5 08/11/17 12.17 24.87 -12.70 330 <0.50 <0.50 <0.50 <1.0 40 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-5 02/28/18 12.17 23.81 -11.64 1,400 <0.50 <0.50 1 11 34 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-5 08/31/18 12.17 23.09 -10.92 1,400 <0.50 <0.50 1 10 30 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-5 03/01/19 12.17 21.50 -9.33 1,300 <0.50 <0.50 1 6 110 24 <0.50 2 <0.50 <0.50 <0.50 <250 MW-5 09/05/19 12.17 19.65 -7.48 1,200 <0.50 <0.50 0.48 J 3.9 200 <10 <0.50 3.8 <0.50 <0.50 <0.50 <250 MW-5 02/28/20 12.17 19.02 -6.85 1,500 <1.0 <1.0 0.32 J 2.6 150 <20 <1.0 2.3 <1.0 <1.0 <1.0 <500 MW-5 09/09/20 12.17 19.99 -7.82 710 <2.5 <2.5 <2.5 <5.0 69 <50 <2.5 1.7 J <2.5 <2.5 <2.5 <1,200 MW-5 01/08/21 12.17 20.04 -7.87 930 <0.50 <0.50 0.24 J 8.2 83 <10 <0.50 1.9 <0.50 <0.50 <0.50 <250 MW-5 07/01/21 12.17 21.03 -8.86 630 <0.50 0.17 J 0.61 2.0 46 <10 <0.50 1.8 <0.50 <0.50 <0.50 <250 MW-5 09/03/21 12.17 21.77 -9.60 710 <0.50 <1.0 <1.0 <2.0 48 21 <1.0 1.5 <2.0 <2.0 <2.0 <100 MW-5 12/30/21 12.17 21.28 -9.11 740 <0.50 <1.0 <1.0 <2.0 31 <10 <1.0 1.5 <2.0 <2.0 <2.0 <100 MW-5 03/09/22 12.17 21.08 -8.91 860 <0.50 <1.0 <1.0 <2.0 30 12 <1.0 1.7 <2.0 <2.0 <2.0 <100 MW-5 09/28/22 12.17 22.98 -10.81 590 <0.50 <1.0 <1.0 <2.0 25 <10 <1.0 1.6 <2.0 <2.0 <2.0 110 MW-6 01/22/01 11.62 27.92 -16.30 2300 22 13 ND 79 ND ND -- -- ND ND ND ND MW-6 04/05/01 11.62 27.38 -15.76 2450 32.3 9.18 ND 45.3 ND ND ND ND ND ND MW-6 07/05/01 11.62 28.32 -16.70 740 26 13 10 25 ND ND ND ND ND ND MW-6 10/10/01 11.62 30.45 -18.83 2300 130 45 70 58 <50 <100 <2.0 <2.0 <2.0 <1,000 MW-6 01/17/02 11.62 29.90 -18.28 4500 250 57 100 34 <100 <40 <2.0 <2.0 <2.0 <1,000 MW-6 04/18/02 11.62 29.16 -17.54 4000 340 110 160 180 <100 <250 <5.0 <5.0 <5.0 <1,200 MW-6 07/11/02 11.62 30.22 -18.60 5500 530 190 230 150 <10 <500 <10 <10 <10 <2,500 MW-6 11/14/02 11.62 33.02 -21.40 2200 200 76 100 130 <2.0 <100 <2.0 <2.0 <2.0 <500 MW-6 01/30/03 11.62 32.19 -20.57 1400 150 43 73 58 <2.0 <100 <2.0 <2.0 <2.0 <500 MW-6 04/28/03 11.62 31.37 -19.75 4300 380 100 180 110 <20 <1,000 <20 <20 <20 <5,000 MW-6 07/28/03 11.62 32.90 -21.28 -- -- -- -- -- -- -- -- -- -- -- MW-6 10/08/03 11.62 33.56 -21.94 -- 330 89 110 98 <10 <500 <10 <10 <10 <10 <2,500 GHD 12594700(1)