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Page 10 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.amsl) (ft) (fL amsp (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pg/L) (pg/L) (pg/L) (Pg/L) (pg/L) MW-7 11/19/07 11.40 29.79 -18.39 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <10 <0.50 12 <0.50 <0.50 <0.50 <250 MW-7 01/22/08 11.41 29.00 -17.69 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 13 <0.50 <0.50 <0.50 <250 MW-7 04/07/08 11.41 27.95 -16.54 <50 <0.50 <0.50 <0.50 <1.0 0.54 <10 <0.50 10 <0.50 <0.50 <0.50 <250 MW-7 07/21/08 11.41 28.26 -16.86 <60 <0.50 <0.50 <0.50 0.0 <0.50 <10 <0.50 5.8 <0.50 <0.50 <0.50 <250 MW-7 10/20/08 11.41 30.74 -19.33 <60 <0.50 <0.50 <0.50 <1.0 0.94 <10 <0.50 5.7 <0.50 <0.50 <0.50 <250 MW-7 01/19/09 11.41 31.11 -19.70 <50 <0.50 <0.50 <0.50 <1.0 2.8 <10 <0.50 7.3 <0.50 <0.50 <0.50 <250 MW-7 04/20/09 11.41 30.45 -19.04 <50 0.61 0.96 <0.50 0.0 1.4 <10 <0.50 5.8 <0.50 <0.50 <0.50 <250 MW-7 07/20/09 11.41 31.50 -20.09 <50 <0.50 <0.50 <0.50 0.0 4.2 <10 <0.50 5.1 <0.50 <0.50 <0.50 <250 MW-7 01/04/10 11.41 32.13 -20.72 <50 <0.50 <0.50 <0.50 <1.0 2.4 <10 <0.50 5.0 <0.50 <0.50 <0.50 <250 MW-7 07/19/10 11.41 29.49 -18.08 - - - - - - - - - - - - - MW-7 01/05/11 11.41 29.52 -18.11 <50 <0.50 <0.50 <0.50 <1.0 4.1 <10 <0.50 4.7 <0.50 <0.50 <0.50 <250 MW-7 08/02M1 11.41 27.29 -15.88 - - - - - - - - - - - - - MW-7 03/27/12 11.41 26.19 -14.78 <50 <0.50 <0.50 <0.50 <1.0 1.9 <10 <0.50 2.1 <0.50 <0.50 <0.50 <250 MW-7 09/D4/12 11.41 26.75 -15.34 - - - - - - - - - - - - - MW-7 02/25/13 11.41 25.50 -14.09 <50 <0.50 <0.50 <0.50 0.0 <0.50 <10 <0.50 0.9 <0.50 <0.50 <0.50 <250 MW-7 08/13/13 11.41 26.55 -15.14 - - - - - - - - - - - - - MW-7 02/07/14 11.41 26.91 -15.50 <50 <0.50 <0.50 <0.50 0.0 27 <10 <0.50 7.1 <0.50 <0.50 <0.50 <250 MW-7 09/24/14 11.41 28.63 -17.22 - - - - - - - - - - - - - MW-7 03/18/15 11.41 29.11 -17.70 <60 <0.50 <0.50 <0.50 <1.0 78 <10 <0.50 17 <0.50 <0.50 <0.50 <250 MW-7 0828/15 11.41 30.93 -19.52 - - - - - - - - - - - - - MW-7 03/30/16 11.41 30.27 -18.86 66 <0.50 <0.50 <0.50 <1.0 65 <10 <0.50 13 <0.50 <0.50 <0.50 <250 MW-7 0829/16 11.41 30.30 -18.89 - - - - - - - - - - - - - MW-7 1029/16 11.41 30.72 -19.31 - - - - - - - - - - - - - MW-7 03/10/17 11.41 26.44 -15.03 <60 <0.50 <0.50 <0.50 <1.0 49 <10 <0.50 12 <0.50 <0.50 <0.50 <250 MW-7 08/11/17 11.41 24.08 -12.67 - - - - - - - - - - - - - MW-7 0228/18 11.41 23.07 -11.66 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 0.77 <0.50 <0.50 <0.50 <250 MW-7 08/31/18 11.41 22.28 -10.87 - - - - - - - - - - - - - MW-7 03/01/19 11.41 20.72 -9.31 94 <0.50 <0.50 <0.50 <1.0 3.8 <10 <0.50 0.9 <0.50 <0.50 <0.50 <250 MW-7 09/05/19 11.41 18.84 -7.43 - - - - - - - - - - - - - MW-7 0228/20 11.41 18.19 -6.78 <50 <0.50 <0.50 <0.50 0.0 <0.50 <10 <0.50 0.96 <0.50 <0.50 <0.50 <250 MW-8 10/10/01 12.61 30.62 -18.01 2,300 600 22 78 19 <1D0 <250 <5.0 <5.0 <5.0 <5.0 <5.0 <2,500 MW-8 01/17/02 12.61 31.02 -18.41 1,200 93 4.2 <2.0 4.5 <20 <20 <1.0 4.4 <1.0 <1.0 0.0 <600 MW-8 04/18/02 12.61 30.28 -17.67 300 4.0 <0.50 <0.50 1.2 <5.0 <100 <2.0 2.0 <2.0 <2.0 <2.0 <500 MW-8 07/11/02 12.61 31.34 -18.73 <50 0.64 <0.50 <0.50 <1.0 <2.0 <5.0 <0.50 1.3 <1.0 <0.50 <0.50 <25 MW-8 11/14/02 12.61 34.28 -21.67 600 230 16 48 11 <10 <500 <10 <10 <10 <10 <10 <2,500 MW-8 01/30/03 12.61 33.32 -20.71 <50 <0.50 <0.50 <0.50 <1.0 <2.0 <100 <2.0 4.1 <2.0 <2.0 <2.0 <600 MW-8 0428/03 12.61 32.47 -19.86 <50 <0.50 <0.50 <0.50 <1.0 36 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW-8 0728/03 12.61 33.96 -21.34 65 <0.50 <0.50 <0.50 0.0 76 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW-8 10/08/03 12.61 35.65 -22.94 <50 <0.50 <0.50 <0.50 2.0 <2.0 <100 <2.0 3.4 <2.0 <2.0 <2.0 <500 MW-8 01/12/04 12.61 35.02 -22.41 100 16 3.4 8.9 3.6 <2.0 <100 <2.0 3.4 <2.0 <2.0 <2.0 <500 MW-8 04/26/04 12.61 33.51 -20.90 <50 <0.50 <0.50 <0.50 <1.0 1.3 <5.0 <0.50 1.6 0.0 <0.50 <0.50 <50 MW-8 07/13/04 12.61 34.74 -22.13 240 20 3.4 22 <1.0 <0.50 <5.0 <0.50 2.6 0.0 <0.50 <0.50 <50 GHD 11193145(5)