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Page 12 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 Well ID Sample Date TOC (ft. amsl) DTW (ft) OWE (ft. amsl) TPH-g (pg/L) Benzene (pg/L) Toluene (pg/L) Ethyl- benzene (pg/L) Total Xylenes (pg/L) MTBE (pg/L) TBA (pg/L) EDB (pg/L) 1,2-DCA (pg/L) DIPE (pg/L) ETBE (pg/L) TAME (pg/L) Ethanol (pg/L) Comments MW-9 10/10/01 10.87 26.98 -16.11 22000 490 260 1,100 3,600 <200 <1,200 <25 <25 <25 <25 <25 <12,000 MW-9 01/17/02 10.87 29.12 -18.25 11,000 260 110 540 1,600 <250 <200 <10 <10 <10 <10 <10 <5,000 MW-9 04/18/02 10.87 28.37 -17.50 2,700 119 23 24 180 <100 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW-9 07/11/02 10.87 29.34 -18.47 8,200 120 71 140 1,000 <10 <25 <2.5 <2.5 <5.0 <2.5 <2.5 <130 MW-9 11/14/02 10.87 32.22 -21.35 2,500 16 7.2 63 55 <2.0 <100 <2.0 <2.0 <2.0 <2.0 <2.0 <500 MW-9 01/30/03 10.87 31.37 -20.50 1,900 12 6.2 49 45 <10 <500 <10 <10 <10 <10 <10 <2,500 MW-9 04/28/03 10.87 30.56 -19.69 1,300 10 3.8 <1.0 8.3 <4.0 <200 <4.0 <4.0 <4.0 <4.0 <4.0 <1,000 MW-9 07/28/03 10.87 31.98 -21.11 550 4.9 1.5 <0.50 3.5 <2.0 <100 <2.0 2.1 <2.0 <2.0 <2.0 <500 MW-9 10/08/03 10.87 35.46 -24.59 520 11 2.8 2.9 7.3 2.7 <100 <2.0 2.2 <2.0 <2.0 <2.0 <500 MW-9 01/12/04 10.87 33.02 -22.15 500 8.0 2.0 20 7.0 3.3 <100 <2.0 2.7 <2.0 <2.0 <2.0 <500 MW-9 04/26/04 10.87 31.57 -20.70 860 12 3.2 32 9.2 3.0 <5.0 <0.50 3.8 <1.0 <0.50 <0.50 <50 MW-9 07/13/04 10.87 32.81 -21.94 1,300 5.4 3.2 110 68 3.7 <5.0 <0.50 5.4 <1.0 <0.50 <0.50 <50 MW-9 10/26/04 10.87 - - - - - - - - - - - - - - Inaccessible MW-9 01/12/05 10.87 34.18 -23.31 840 6.9 2.8 23 14 8.2 <5.0 <0.50 4.6 <1.0 <0.50 <0.50 <50 MW-9 04/12/05 10.87 31.76 -20.89 1,400 3.9 2.4 66 43 28 <5.0 <0.50 3.9 <0.50 <0.50 <0.50 <50 MW-9 07/12/05 10.87 30.82 -19.95 2,400 3.8 3.9 150 120 60 5.1 <0.50 4.6 <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 2.7 <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 <0.50 <250 MW-9 04/12/06 10.87 16.33 -5.46 1,800 t4 1.8 46 66 220 <10 - 3.6 <0.50 <0.50 <0.50 <250 MW-9 07/10/06 10.87 27.48 -16.61 1,400 <5.0 <5.0 <5.0 14 220 <100 - <5.0 <5.0 <5.0 <5.0 <2,500 MW-9 10/18/06 10.87 28.65 -17.78 2,000 <2.5 <5.0 110 71 340 210 - 3.4 <5.0 <5.0 <5.0 <2,500 MW-9 03/12/07 10.87 27.87 -17.00 1,000 2.2 1.4 5.3 16 370 100 - 2.3 <0.50 <0.50 <0.50 <250 MW-9 05/15/07 10.87 27.63 -16.76 900 1.2 0.61 0.72 1.7 320 69 <0.50 1.9 <0.50 <0.50 <0.50 <250 MW-9 08/01/07 10.87 28.28 -17.41 690 0.76 0.51 <0.50 1.8 250 180 <0.50 1.5 <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 1.0 200 190 <0.50 1.2 <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 2.3 <0.50 <0.50 <0.50 <250 MW-9 04/07/08 10.86 27.29 -16.43 1,300 1.8 1.2 59 43 300 450 <0.50 1.6 <0.50 <0.50 <0.50 <250 MW-9 07/21/08 10.86 28.68 -17.82 1,600 4.4 2.5 31 56 450 1,300 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-9 10/20/08 10.86 30.13 -19.27 1,700 1.7 1.5 86 62 370 860 <0.50 2.1 <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 2.0 <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 1.9 <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 <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 1.6 <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 1.1 <0.50 <0.50 <0.50 <250 MW-9 01/05/11 10.86 28.86 -18.00 1,200 0.66 <0.50 2.0 9.0 140 800 <0.50 0.61 <0,50 <0.50 <0.50 <250 MW-9 08/02/11 10.86 26.68 -15.82 690 <0.50 <0.50 6.2 5.5 120 670 <0.50 0.78 <0.50 <0.50 <0.50 <250 MW-9 03/27/12 10.86 25.63 -14.77 <50 <0.50 <0.50 <0.50 <1.0 40 300 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-9 09/04/12 10.86 26.20 -15.34 130 <0.50 <0.50 1.5 <1.0 38 900 <0.50 0.99 <0.50 <0.50 <0.50 <250 MW-9 02/25/13 10.86 24.90 -14.04 78 <0.50 <0.50 1.2 <1.0 26 740 <0.50 0.66 <0.50 <0.50 <0.50 <250 MW-9 08/13/13 10.86 30.29 -19.43 330 <0.50 <0.50 9.5 4.0 54 710 <0.50 1.7 <0.50 <0.50 <0.50 <250 MW-9 02/07/14 10.86 27.60 -16.74 <50 <0.50 <0.50 <0.50 <1.0 31 320 <0.50 0.74 <0.50 <0.50 <0.50 <250 MW-9 09/24/14 10.86 28.02 -17.16 <50 <0.50 <0.50 <0.50 <1.0 15 170 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-9 03/18/15 10.86 28.48 -17.62 <50 <0.50 <0.50 <0.50 <1.0 12 130 <0.50 <0.50 <0.50 <0.50 <0.50 <250 GHD 11193145(5)