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Page 14 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-5 04/18/02 12.17 29.66 -17.49 7300 46 11 270 430 <100 <200 -- -- <4.0 <4.0 <4.0 <1,000 MW-5 07/11/02 12.17 30.74 -18.57 10000 4.8 5.6 430 690 <8.0 <400 -- -- <8.0 <8.0 <8.0 <2,000 MW-5 11/14/02 12.17 33.54 -21.37 2500 2.7 3.5 120 220 <2.0 <100 -- -- <2.0 <2.0 <2.0 <500 MW-5 01/30/03 12.17 32.68 -20.51 1500 <2.5 <2.5 37 67 <10 <500 -- -- <10 <10 <10 <2,500 MW-5 04/28/03 12.17 31.85 -19.68 3100 2.9 2.9 120 160 <10 <500 -- -- <10 <10 <10 <2,500 MW-5 07/28/03 12.17 33.33 -21.16 -- -- -- -- -- -- -- -- -- -- -- -- -- MW-5 10/08/03 12.17 34.94 -22.77 -- <2.5 <2.5 <2.5 63 <10 <500 <10 <10 <10 <10 <2,500 MW-5 01/12/04 12.17 34.31 -22.14 -- <5.0 <5.0 270 550 <20 <1,000 <20 <20 <20 <20 <5,000 MW-5 04/26/04 12.17 32.88 -20.71 -- <2.5 <2.5 260 510 7.7 <25 <2.5 <5.0 <2.5 <2.5 <250 MW-5 07/13/04 12.17 34.15 -21.98 1800 <2.5 <2.5 140 270 13 <25 <2.5 -- <5.0 <2.5 <2.5 <250 MW-5 10/26/04 12.17 36.16 -23.99 4200 <2.5 <2.5 270 530 100 <25 <2.5 -- <5.0 <2.5 <2.5 <250 MW-5 01/12/05 12.17 35.50 -23.33 9500 <2.5 3 430 1200 290 <25 <2.5 -- <5.0 <2.5 <2.5 <250 MW-5 04/12/05 12.17 33.01 -20.84 7100 <2.5 <2.5 290 650 300 <25 <2.5 -- <2.5 <2.5 <2.5 <250 MW-5 07/12/05 12.17 32.12 -19.95 5400 <2.5 2.5 210 640 280 <25 <2.5 -- <2.5 <2.5 <2.5 <250 MW-5 10/06/05 12.17 33.75 -21.58 980 <2.0 <2.0 37 90 210 56 <2.0 -- <2.0 <2.0 <2.0 <200 MW-5 01/12/06 12.17 32.61 -20.44 1500 <0.50 <0.50 4.6 120 320 84 -- -- <0.50 <0.50 <0.50 <250 MW-5 04/12/06 12.17 30.51 -18.34 120 3.2 1.9 3.1 8.3 22 <25 -- -- <0.50 <0.50 <0.50 <250 MW-5 07/10/06 12.17 28.79 -16.62 21000 11 7 310 550 12000 3500 -- -- <5.0 <5.0 12 <2,500 MW-5 10/18/06 12.17 29.08 -16.91 14000 <25 <25 130 320 11000 7600 -- -- <5.0 <5.0 <25 <2,500 MW-5 03/12/07 12.17 29.17 -17.00 15000 <0.50 <0.50 240 390 18000 <1,000 -- -- <50 <50 <50 <25,000 MW-5 05/15/07 12.17 28.96 -16.79 16000 15 15 47 100 17000 2800 <0.50 -- <0.50 <0.50 14 <250 MW-5 08/01/07 12.17 29.64 -17.47 16000 <12 <12 53 120 13000 3800 <12 -- <12 <12 16 <6,200 MW-5 11/19/07 12.17 30.45 -18.28 21000 <50 <50 430 610 22000 <1,000 <50 -- <50 <50 <50 <25,000 MW-5 01/22/08 12.17 29.70 -17.53 18000 <25 <25 110 190 29000 1100 <25 <25 <25 <25 <12,000 MW-5 04/07/08 12.17 28.62 -16.45 18,000 a <25 <25 130 270 25000 1200 <25 <25 <25 27 <12,000 MW-5 07/21/08 12.17 29.93 -17.76 20000 2.6 7.6 250 440 20000 5700 <0.50 <0.50 <0.50 33 <250 MW-5 10/20/08 12.17 31.44 -19.27 27000 <50 <50 580 870 20000 3300 <50 <50 <50 <50 <25000 MW-5 01/19/09 12.17 31.80 -19.63 24,000 <50 <50 590 680 4,400 12,000 <50 <50 <50 <50 <25,000 MW-5 04/20/09 12.17 31.11 -18.94 14,000 <5.0 <5.0 380 620 14,000 4,400 <5.0 <5.0 <5.0 24 <2,500 MW-5 07/20/09 12.17 32.19 -20.02 1400 <50 <50 <50 <100 7300 <1000 <50 <50 <50 <50 <25000 MW-5 01/04/10 12.17 32.83 -20.66 13000 <50 <50 320 390 13000 <1000 <50 <50 <50 <50 <25000 MW-5 07/19/10 12.17 30.20 -18.03 8100 <0.50 1.7 320 190 6100 3400 <0.50 <0.50 <0.50 9.6 <250 MW-5 01/05/11 12.17 30.13 -17.96 3000 <0.50 <0.50 2.2 3.2 3600 1700 <0.50 <0.50 <0.50 5.6 <250 MW-5 08/02/11 12.17 28.01 -15.84 580 <0.50 <0.50 <0.50 1.9 500 48 <0.50 <0.50 <0.50 <0.50 <250 MW-5 03/27/12 12.17 26.95 -14.78 1700 <0.50 <0.50 12 210 98 72 <0.50 <0.50 <0.50 <0.50 <250 MW-5 09/04/12 12.17 27.56 -15.39 <50 <0.50 <0.50 <0.50 <1.0 17 17 <0.50 <0.50 <0.50 <0.50 <250 GHD 12594700(1)