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Page 21 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-9 10/10/01 26.98 22000 490 260 1100 3600 <200 <1,200 -- -- <25 <25 <25 <12,000 MW-9 01/17/02 29.12 11000 260 110 540 1600 <250 <200 -- -- <10 <10 <10 <5,000 MW-9 04/18/02 28.37 2700 110 23 24 180 <100 <100 -- -- <2.0 <2.0 <2.0 <500 MW-9 07/11/02 29.34 8200 120 71 140 1000 <10 <500 -- -- <10 <10 <10 <2,500 MW-9 11/14/02 32.22 2500 16 7.2 63 55 <2.0 <100 -- -- <2.0 <2.0 <2.0 <500 MW-9 01/30/03 31.37 1900 12 6.2 49 45 <10 <500 -- -- <10 <10 <10 <2,500 MW-9 04/28/03 30.56 1300 10 3.8 <1.0 8.3 <4.0 <200 -- -- <4.0 <4.0 <4.0 <1,000 MW-9 07/28/03 31.98 -- -- -- -- -- -- -- -- -- -- -- -- -- MW-9 10/08/03 10.87 35.46 -24.59 -- 11 2.8 2.9 7.3 2.7 <100 <2.0 -- <2.0 <2.0 <2.0 <500 MW-9 01/12/04 10.87 33.02 -22.15 -- 8 2 20 7 3.3 <100 <2.0 -- <2.0 <2.0 <2.0 <500 MW-9 04/26/04 10.87 31.57 -20.70 -- 12 3.2 32 9.2 3 <5.0 <0.50 <1.0 <0.50 <0.50 <50 MW-9 07/13/04 10.87 32.81 -21.94 1300 5.4 3.2 110 68 3.7 <5.0 <0.50 <1.0 <0.50 <0.50 <50 MW-9 10/26/04 10.87 -- -- -- -- -- -- -- -- -- -- -- -- -- -- MW-9 01/12/05 10.87 34.18 -23.31 840 5.9 2.8 23 14 8.2 <5.0 <0.50 <1.0 <0.50 <0.50 <50 MW-9 04/12/05 10.87 31.76 -20.89 1400 3.9 2.4 66 43 28 <5.0 <0.50 <0.50 <0.50 <0.50 <50 MW-9 07/12/05 10.87 30.82 -19.95 2400 3.8 3.9 150 120 60 5.1 <0.50 <0.50 <0.50 <0.50 <50 MW-9 10/06/05 10.87 32.44 -21.57 910 2.2 2.1 27 55 76 <5.0 <0.50 <0.50 <0.50 <0.50 <50 MW-9 01/12/06 10.87 31.28 -20.41 210 <0.50 <0.50 5.5 5.2 29 <10 -- <0.50 <0.50 <0.50 <250 MW-9 04/12/06 10.87 16.33 -5.46 1800 1.4 1.8 46 66 220 <10 <0.50 <0.50 <0.50 <250 MW-9 07/10/06 10.87 27.48 -16.61 1400 <5.0 <5.0 <5.0 14 220 <100 <5.0 <5.0 <5.0 <2,500 MW-9 10/18/06 10.87 28.65 -17.78 2000 <2.5 <5.0 110 71 340 210 <5.0 <5.0 <5.0 <2,500 MW-9 03/12/07 10.87 27.87 -17.00 1000 2.2 1.4 5.3 16 370 100 -- <0.50 <0.50 <0.50 <250 MW-9 05/15/07 10.87 27.63 -16.76 900 1.2 0.51 0.72 1.7 320 69 <0.50 <0.50 <0.50 <0.50 <250 MW-9 08/01/07 10.87 28.28 -17.41 690 0.75 0.51 <0.50 1.8 250 180 <0.50 <0.50 <0.50 <0.50 <250 MW-9 11/19/07 10.87 29.18 -18.31 210 2.2 0.65 1.1 1 200 190 <0.50 <0.50 <0.50 <0.50 <250 MW-9 01/22/08 10.86 28.93 -18.07 <50 <0.50 <0.50 <0.50 <1.0 6.4 410 <0.50 <0.50 <0.50 <0.50 <250 MW-9 04/07/08 10.86 27.29 -16.43 1300 1.8 1.2 59 43 300 450 <0.50 <0.50 <0.50 <0.50 <250 MW-9 07/21/08 10.86 28.68 -17.82 1600 4.4 2.5 31 56 450 1300 <0.50 <0.50 <0.50 <0.50 <250 MW-9 10/20/08 10.86 30.13 -19.27 1700 1.7 1.5 86 62 370 860 <0.50 <0.50 <0.50 <0.50 <250 MW-9 01/19/09 10.86 30.50 -19.64 1,100 1.7 1.2 1.8 5.7 320 1,100 <0.50 <0.50 <0.50 <0.50 <250 MW-9 04/20/09 10.86 29.81 -18.95 740 1.5 0.79 0.79 2.8 310 890 <0.50 <0.50 <0.50 <0.50 <250 MW-9 07/20/09 10.86 30.84 -19.98 590 1.3 0.57 0.77 1.7 260 790 <0.50 <0.50 <0.50 <0.50 <250 MW-9 01/04/10 10.86 31.49 -20.63 460 0.95 <0.50 0.9 <1.0 200 790 <0.50 <0.50 <0.50 <0.50 <250 MW-9 07/19/10 10.86 28.87 -18.01 890 0.58 <0.50 20 12 170 650 <0.50 <0.50 <0.50 <0.50 <250 MW-9 01/05/11 10.86 28.86 -18.00 1200 0.66 <0.50 2 9 140 800 <0.50 <0.50 <0.50 <0.50 <250 MW-9 08/02/11 10.86 26.68 -15.82 590 <0.50 <0.50 6.2 5.5 120 670 <0.50 <0.50 <0.50 <0.50 <250 GHD 12594700(1)