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Page 2 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-1 01/19/09 11.39 30.90 -19.51 72 <0.50 <0.50 <0.50 <1.0 88 520 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 04/20/09 11.39 30.25 -18.86 190 <0.50 <0.50 <0.50 <1.0 130 500 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 07/20/09 11.39 31.15 -19.76 140 <0.50 <0.50 <0.50 <1.0 130 370 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 01/04/10 11.39 31.78 -20.39 360 <0.50 <0.50 <0.50 <1.0 340 480 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 07/19/10 11.39 29.14 -17.75 260 <0.50 <0.50 <0.50 <1.0 240 130 <0.50 <0.50 <0.50 <0.50 <250 MW-1 01/05/11 11.39 29.13 -17.74 250 <0.50 <0.50 <0.50 <1.0 220 110 <0.50 <0.50 <0.50 <0.50 <250 MW-1 08/02/11 11.39 26.97 -15.58 200 <0.50 <0.50 <0.50 <1.0 170 79 <0.50 <0.50 <0.50 <0.50 <250 MW-1 03/27/12 11.39 25.92 -14.53 <50 <0.50 <0.50 <0.50 <1.0 100 160 <0.50 <0.50 <0.50 <0.50 <250 MW-1 09/04/12 11.39 26.58 -15.19 <50 <0.50 <0.50 <0.50 <1.0 71 180 <0.50 <0.50 <0.50 <0.50 <250 MW-1 02/25/13 11.39 25.30 -13.91 <50 <0.50 <0.50 <0.50 <1.0 23 150 <0.50 <0.50 <0.50 <0.50 <250 MW-1 08/13/13 11.39 26.30 -14.91 <50 <0.50 <0.50 <0.50 <1.0 21 130 <0.50 <0.50 <0.50 <0.50 <250 MW-1 02/07/14 11.39 26.65 -15.26 <50 <0.50 <0.50 <0.50 <1.0 8.2 100 <0.50 <0.50 <0.50 <0.50 <250 MW-1 09/24/14 11.39 28.37 -16.98 <50 <0.50 <0.50 <0.50 <1.0 8.3 320 <0.50 <0.50 <0.50 <0.50 <250 MW-1 03/18/15 11.39 28.86 -17.47 <50 <0.50 <0.50 <0.50 <1.0 6.6 300 <0.50 <0.50 <0.50 <0.50 <250 MW-1 08/28/15 11.39 31.64 -20.25 <50 <0.50 <0.50 <0.50 <1.0 3.8 230 <0.50 <0.50 <0.50 <0.50 <250 MW-1 03/30/16 11.39 29.89 -18.50 <50 <0.50 <0.50 <0.50 <1.0 3.7 210 <0.50 <0.50 <0.50 <0.50 <250 MW-1 08/29/16 11.39 29.96 -18.57 <50 <0.50 <0.50 <0.50 <1.0 4.8 <10 <0.50 3.1 <0.50 <0.50 <0.50 <250 MW-1 03/10/17 11.39 26.11 -14.72 77 <0.50 <0.50 <0.50 <1.0 7.8 270 <0.50 3.4 <0.50 <0.50 <0.50 <250 MW-1 08/11/17 11.39 23.86 -12.47 120 <0.50 <0.50 <0.50 <1.0 7 180 <0.50 4.2 1 <0.50 <0.50 <250 MW-1 02/28/18 11.39 22.82 -11.43 <50 <0.50 <0.50 <0.50 <1.0 5 77 <0.50 3.8 <0.50 <0.50 <0.50 <250 MW-1 08/31/18 11.39 22.10 -10.71 <50 <0.50 <0.50 <0.50 <1.0 7 <10 <0.50 3.6 <0.50 <0.50 <0.50 <250 MW-1 03/01/19 11.39 20.52 -9.13 <50 <0.50 <0.50 <0.50 <1.0 6 <10 <0.50 3.6 1 <0.50 <0.50 <250 MW-1 09/05/19 11.39 18.70 -7.31 <50 <0.50 <0.50 <0.50 <1.0 6.7 <10 <0.50 5.8 <0.50 <0.50 <0.50 <250 MW-1 02/28/20 11.39 18.06 -6.67 <50 <0.50 <0.50 <0.50 <1.0 5.0 <10 <0.50 3.0 0.49 J <0.50 <0.50 <250 MW-1 09/09/20 11.39 19.05 -7.66 <50 <0.50 <0.50 <0.50 <1.0 0.66 <10 <0.50 2.2 <0.50 <0.50 <0.50 <250 MW-1 01/08/21 11.39 19.60 -8.21 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 1.9 <0.50 <0.50 <0.50 <250 MW-1 07/01/21 11.39 20.06 -8.67 <50 <0.50 <0.50 0.14 J <1.0 2.7 <10 <0.50 3.1 <0.50 <0.50 <0.50 <250 MW-1 09/03/21 11.39 20.81 -9.42 <50 <0.50 <1.0 <1.0 <2.0 2.4 <10 <1.0 2.5 <2.0 <2.0 <2.0 <100 MW-1 12/30/21 11.39 20.31 -8.92 <50 <0.50 <1.0 <1.0 <2.0 2.7 <10 <1.0 2.1 <2.0 <2.0 <2.0 <100 MW-1 03/09/22 11.39 20.07 -8.68 <50 <0.50 <1.0 <1.0 <2.0 4.7 <10 <1.0 2.0 <2.0 <2.0 <2.0 <100 MW-1 09/28/22 11.39 22.02 -10.63 <50 <0.50 <1.0 <1.0 <2.0 7.2 <10 <1.0 1.5 <2.0 <2.0 <2.0 <100 MW-2 01/05/00 12.68 29.70 -17.02 ND ND ND ND ND ND ND -- -- ND ND ND -- MW-2 04/10/00 12.68 27.36 -14.68 ND ND ND ND ND ND ND -- -- ND ND ND -- MW-2 07/05/00 12.68 27.22 -14.54 ND ND ND ND ND ND ND -- -- ND ND ND -- MW-2 10/10/00 12.68 29.31 -16.63 ND ND ND ND ND ND ND -- -- ND ND ND -- GHD 12594700(1)