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Page 1 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) A Zone MW-1 04/10/00 11.44 24.81 -13.37 ND ND ND ND ND ND ND -- -- ND ND ND MW-1 07/05/00 11.44 25.79 -14.35 ND ND ND ND ND ND ND -- -- ND ND ND MW-1 10/10/00 11.44 27.86 -16.42 ND ND ND ND ND ND ND -- -- ND ND ND MW-1 01/22/01 11.44 27.67 -16.23 ND ND ND ND ND ND ND -- -- ND ND ND ND MW-1 04/05/01 11.44 27.10 -15.66 ND ND ND ND ND ND ND -- -- ND ND ND ND MW-1 07/05/01 11.44 28.06 -16.62 ND ND ND ND ND ND ND -- -- ND ND ND ND MW-1 10/10/01 11.44 30.19 -18.75 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <100 -- -- <2.0 <2.0 <2.0 <1,000 MW-1 01/17/02 11.44 29.59 -18.15 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <20 -- -- <1.0 <1.0 <1.0 <500 MW-1 04/18/02 11.44 28.86 -17.42 <50 <0.50 <0.50 <0.50 <0.50 <5.0 <100 -- -- <2.0 <2.0 <2.0 <500 MW-1 07/11/02 11.44 29.93 -18.49 <50 <0.50 <0.50 <0.50 <1.0 2.5 <100 -- -- <2.0 <2.0 <2.0 <500 MW-1 11/14/02 11.44 32.71 -21.27 <50 <0.50 <0.50 <0.50 <1.0 <2.0 <100 <2.0 <2.0 <2.0 <500 MW-1 01/30/03 11.44 31.83 -20.39 <50 <0.50 <0.50 <0.50 <1.0 <2.0 <100 <2.0 <2.0 <2.0 <500 MW-1 04/28/03 11.44 31.03 -19.59 <50 <0.50 <0.50 <0.50 <1.0 33 <100 <2.0 <2.0 <2.0 <500 MW-1 07/28/03 11.44 32.54 -21.10 -- -- -- -- -- -- -- -- -- -- -- -- MW-1 10/08/03 11.44 34.09 -22.65 <0.50 <0.50 <0.50 1.3 46 <100 <2.0 <2.0 <2.0 <2.0 <500 MW-1 01/12/04 11.44 33.48 -22.04 <1.0 <1.0 <1.0 <2.0 80 <200 <4.0 <4.0 <4.0 <4.0 <1,000 MW-1 04/26/04 11.44 32.03 -20.59 <2.5 <2.5 <2.5 <5.0 430 <25 <2.5 <5.0 <2.5 <2.5 <250 MW-1 07/13/04 11.44 35.33 -23.89 300 <2.5 <2.5 <2.5 <5.0 580 <25 <2.5 -- <5.0 <2.5 <2.5 <250 MW-1 10/26/04 11.44 35.34 -23.90 1,100 <2.5 <2.5 <2.5 <5.0 840 <25 <2.5 -- <5.0 <2.5 <2.5 <250 MW-1 01/12/05 11.44 34.66 -23.22 1,100 <0.50 <0.50 0.75 <1.0 1200 330 <5.0 -- <10 <5.0 <5.0 <500 MW-1 04/12/05 11.44 32.18 -20.74 1,600 <0.50 <0.50 1.9 3.6 2000 <50 <5.0 -- <5.0 <5.0 <5.0 <500 MW-1 07/12/05 11.44 31.31 -19.87 1,900 <0.50 <0.50 <0.50 <1.0 5000 <500 <50 -- <50 <50 <50 <500 MW-1 10/06/05 11.44 32.92 -21.48 5,300 <5.0 <5.0 12 23 4500 <50 <5.0 -- <5.0 <5.0 <5.0 <500 MW-1 01/12/06 11.44 31.78 -20.34 1,200 <0.50 <0.50 <0.50 <1.0 1600 6700 -- -- <0.50 <0.50 1.6 <250 MW-1 04/12/06 11.44 29.65 -18.21 480 <0.50 <0.50 <0.50 <1.0 560 5700 -- -- <0.50 <0.50 0.71 <250 MW-1 07/10/06 11.44 27.94 -16.50 420 <5.0 <5.0 <5.0 <10 320 4000 -- -- <5.0 <5.0 <5.0 <2,500 MW-1 10/18/06 11.44 29.15 -17.71 390 <5.0 <5.0 <5.0 <10 400 3500 -- -- <5.0 <5.0 <5.0 <2,500 MW-1 03/12/07 11.44 28.37 -16.93 210 <0.50 <0.50 <0.50 <0.50 230 3000 -- -- <0.50 <0.50 <0.50 <250 MW-1 05/15/07 11.44 28.13 -16.69 450 <0.50 <0.50 <0.50 <0.50 480 640 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 08/01/07 11.44 28.81 -17.37 160 <0.50 <0.50 <0.50 <0.50 240 3000 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 11/19/07 11.44 29.62 -18.18 65 <0.50 <0.50 <0.50 <0.50 77 3600 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 01/22/08 11.39 28.82 -17.43 210 <0.50 <0.50 0.77 <1.0 270 1000 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 04/07/08 11.39 27.75 -16.36 190 a 0.60 2.4 2.0 14 200 <10 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 07/21/08 11.39 29.12 -17.73 99 <0.50 <0.50 <0.50 <1.0 88 360 <0.50 -- <0.50 <0.50 <0.50 <250 MW-1 10/20/08 11.39 30.60 -19.21 89 <0.50 <0.50 <0.50 <1.0 73 610 <0.50 -- <0.50 <0.50 <0.50 <250 GHD 12594700(1)