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Page 10 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-18 02/07/14 11.34 26.72 -15.38 1400 <0.50 <0.50 13 <1.0 50 170 <0.50 -- <0.50 <0.50 <0.50 <250 MW-18 09/24/14 11.34 28.40 -17.06 770 <0.50 <0.50 3.9 <1.0 33 340 <0.50 -- <0.50 <0.50 <0.50 <250 MW-18 03/18/15 11.34 28.85 -17.51 660 <0.50 <0.50 2.2 1 28 240 <0.50 -- <0.50 <0.50 <0.50 <250 MW-18 08/28/15 11.34 30.63 -19.29 2500 <0.50 <0.50 5.3 <1.0 35 <10 <0.50 -- <0.50 <0.50 <0.50 <250 MW-18 03/30/16 11.34 29.99 -18.65 4,300 c <0.50 <0.50 21 11 50 <10 <0.50 -- <0.50 <0.50 <0.50 <250 MW-18 08/29/16 11.34 30.05 -18.71 4100 <0.50 <0.50 24 7.0 38 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-18 03/10/17 11.34 26.15 -14.81 2,200 <0.50 <0.50 8.8 <1.0 23 <10 <0.50 2 <0.50 <0.50 <0.50 <250 MW-18 08/11/17 11.34 23.90 -12.56 4,200 <0.50 <0.50 7 3 29 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-18 02/28/18 11.34 22.89 -11.55 4,600 <0.50 <0.50 13 3 35 <10 <0.50 1.3 <0.50 <0.50 <0.50 <250 MW-18 08/31/18 11.34 22.11 -10.77 4,400 <0.50 <0.50 13 2 17 <10 <0.50 1.6 <0.50 <0.50 <0.50 <250 MW-18 03/01/19 11.34 20.53 -9.19 1,500 <0.50 <0.50 9 1 31 <10 <0.50 2 <0.50 <0.50 <0.50 <250 MW-18 09/05/19 11.34 18.73 -7.39 1,900 <0.50 0.68 8.9 1.8 29 100 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-18 02/28/20 11.34 18.15 -6.81 700 <0.50 <0.50 4.3 6.4 38 <10 <0.50 2.0 <0.50 <0.50 <0.50 <250 MW-18 09/09/20 11.34 19.13 -7.79 200 0.40 J <0.50 0.84 1.2 12 <10 <0.50 1.5 <0.50 <0.50 <0.50 <250 MW-18 01/08/21 11.34 19.63 -8.29 490 <0.50 0.31 J 0.14 J <1.0 17 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-18 07/01/21 11.34 20.14 -8.80 320 0.30 J <0.50 2.5 3.8 29 <10 <0.50 2.7 <0.50 <0.50 <0.50 <250 MW-18 09/02/21 11.34 20.89 -9.55 <50 <0.50 <1.0 <1.0 <2.0 20 <10 <1.0 3.4 <2.0 <2.0 <2.0 <100 MW-18 12/30/21 11.34 20.40 -9.06 <50 <0.50 <1.0 <1.0 <2.0 22 <10 <1.0 1.9 <2.0 <2.0 <2.0 <100 MW-18 03/09/22 11.34 20.17 -8.83 <50 <0.50 <1.0 <1.0 <2.0 26 17 <1.0 2.3 <2.0 <2.0 <2.0 <100 MW-18 09/27/22 11.34 22.06 -10.72 <50 <0.50 <1.0 <1.0 <2.0 24 10 <1.0 2.0 <2.0 <2.0 <2.0 <100 MW-19 01/24/08 11.79 20.50 -8.71 1100 <0.50 <0.50 <0.50 1.5 9500 2500 <0.50 -- <0.50 <0.50 12 <250 MW-19 04/07/08 11.79 28.07 -16.28 6,200 a <0.50 <0.50 <0.50 <1.0 9100 930 <0.50 <0.50 <0.50 14 <250 MW-19 07/21/08 11.79 29.45 -17.66 7100 <10 <10 <10 <20 8000 <200 <10 <10 <10 <10 <5000 MW-19 10/20/08 11.79 30.90 -19.11 8000 <12 <12 <12 <25 8700 <250 <12 <12 <12 <12 <6200 MW-19 01/19/09 11.79 31.26 -19.47 5500 <5.0 <5.0 <5.0 <10 8000 4100 <5.0 <5.0 <5.0 9.8 <2,500 MW-19 04/20/09 11.79 30.56 -18.77 6100 <12 <12 <12 <25 6800 970 <12 <12 <12 <12 <6,200 MW-19 07/20/09 11.79 31.66 -19.87 710 30 16 3 <5.0 230 <50 <2.5 <2.5 <2.5 <2.5 <1200 MW-19 01/04/10 11.79 32.30 -20.51 2800 <10 <10 <10 <20 2900 <200 <10 <10 <10 <10 <5000 MW-19 07/19/10 11.79 29.63 -17.84 2000 <0.50 <0.50 <0.50 <1.0 1600 550 <0.50 <0.50 <0.50 1.9 <250 MW-19 01/05/11 11.79 29.61 -17.82 2100 <0.50 <0.50 <0.50 <1.0 1200 <10 <0.50 <0.50 <0.50 <0.50 <250 MW-19 08/02/11 11.79 27.47 -15.68 1300 <0.50 <0.50 <0.50 <1.0 580 150 <0.50 <0.50 <0.50 <0.50 <250 MW-19 03/27/12 11.79 26.42 -14.63 280 <0.50 <0.50 <0.50 <1.0 220 160 <0.50 <0.50 <0.50 <0.50 <250 MW-19 09/04/12 11.79 27.06 -15.27 790 <0.50 <0.50 <0.50 <1.0 450 210 <0.50 <0.50 <0.50 0.69 <250 MW-19 02/25/13 11.79 25.78 -13.99 200 <0.50 <0.50 <0.50 <1.0 130 160 <0.50 <0.50 <0.50 <0.50 <250 MW-19 08/13/13 11.79 26.77 -14.98 82 <0.50 <0.50 <0.50 <1.0 82 47 <0.50 <0.50 <0.50 <0.50 <250 GHD 12594700(1)