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Page 3 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 Ethyl- Total Sample TOC DTW GWE TPH-g Benzene Toluene benzene Xylenes MTBE TBA EDB 1,2-DCA DIPE ETBE TAME Ethanol Comments Well ID Date (ft.amsl) (ft) (ft.amsl) (pg/L) (pg/L) WWI-) (pg/L) (pg/L) (ilg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pg/L) (pglL) (pglL) MW-2 04/12/D6 12.68 31.24 -18.56 290 <0.50 <0.50 <0.50 0.0 360 <10 - <0.50 <0.50 <0.50 <0.50 <250 MW-2 07/10/06 12.68 29.46 -16.78 55 <0.50 <0.50 <0.50 <1.0 5D <10 - <0.50 <0.50 <0.50 <0.50 <250 MW-2 1D/18/06 12.68 30.66 -17.98 84 0.62 0.59 <0.50 0.0 73 37 - <0.50 <0.50 <0.50 <0.50 <250 MW-2 03/12/07 12.68 29.87 -17.19 740 <0.50 <0.50 <0.50 <0.50 940 <10 - <0.50 <0.50 <0.50 0.96 <250 MW-2 05/15/07 12.68 29.63 -16.95 1,000 <0.50 <0.50 <0.50 <0.50 1,300 13 <0.50 <0.50 <0.50 <0.50 1.5 <250 MW-2 08/01/07 12.68 30.29 -17.61 610 <0.50 <0.50 <0.50 <0.50 610 <10 <0.50 <0.50 <0.50 <0.50 0.67 <250 MW-2 11/19/07 12.68 31.13 -18.45 350 <0.50 <0.50 <0.50 <0.50 590 <10 <0.50 <0.50 <0.50 <0.50 0.61 <250 MW-2 01/22/08 12.87 30.30 -17.43 730 <5.0 <5.0 <5.0 <10 1,200 <100 <5.0 <5.0 <5.0 <5.0 <5.0 <2,500 MW-2 04/07/08 12.87 29.29 -16.42 360 a <0.50 <0.50 <0.50 0.0 440 <10 <0.50 <0.50 <0.50 -0.50 <0.50 <250 MW-2 07/21/08 12.87 30.64 -17.77 170 <0.50 <0.50 <0.50 0.0 190 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 10/20/08 12.87 32.17 -19.30 260 <0.50 <0.50 <0.50 <1.0 270 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 01/19/09 12.87 32.53 -19.66 180 <0.50 <0.50 <0.50 <1.0 240 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 04/20/09 12.87 31.86 -18.99 440 <0.50 <0.50 <0.50 <1.0 460 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 07/20/09 12.87 32.86 -19.99 390 <0.50 <0.50 <0.50 <1.0 430 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 01/04/10 12.87 33.40 -20.53 120 <0.50 <0.50 <0.50 0.0 110 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 07/19/10 12.87 30.72 -17.85 - - - - - - - - - - - - - MW-2 01/05111 12.87 30.77 -17.90 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 08/02/11 12.87 28.52 -15.65 - - - - - - - - - - - - - MW-2 03/27/12 12.87 27.48 -14.61 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 09/04/12 12.87 28.02 -15.15 - - - - - - - - - - - - - MW-2 02/25/13 12.87 26.75 -13.8B <50 <0.50 <0.50 <0.50 <1.0 5.6 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 08/13/13 12.87 27.80 -14.93 - - - - - - - - - - - - - MW-2 02/07/14 12.87 28.18 -15.31 <50 <0.50 <0.50 <0.50 <1.0 3.7 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 09/24/14 12.87 29.89 -17.02 - - - - - - - - - - - - - MW-2 03/18/15 12.87 30.40 -17.53 <50 <0.50 <0.50 <0.50 <1.0 <0.50 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 08/28/15 12.87 32.21 -19.34 - - - - - - - - - - - - - MW-2 03/30/16 12.87 31.51 -18.64 <50 <0.50 <0.50 <0.50 <1.0 0.52 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 08/29/16 12.87 31.55 -18.68 - - - - - - - - - - - - - MW-2 03/10/17 12.87 27.77 -14.90 <50 <0.50 <0.50 <0.50 0.0 15 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 _ MW-2 08/11/17 12.87 25.40 -12.53 - - - - - - - - - - - - - MW-2 02/28/18 12.87 24.33 -11.46 <50 <0.50 <0.50 <0.50 <1.0 3.4 <10 <0.50 0.63 <0.50 <0.50 <0.50 <250 MW-2 013/31/18 12.87 23.52 -10.65 - - - - - - - - - - - - - MW-2 03/01/19 12.87 22.05 -9.18 <50 <0.50 <0.50 <0.50 <1.0 3.9 14 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-2 09/05/19 12.87 20.11 -7.24 - - - - - - - - - - - - - MW-2 02/28/20 12.87 19.47 -6.60 <50 <0.50 <0.50 <0.50 <1.0 5.1 <10 <0.50 <0.50 <0.50 <0.50 <0.50 <250 MW-3 01/06/00 12.02 29.06 -17.04 NO 0.61 NO NO NO 3.0 NO NO NO NO NO NO - MW3 04/10/00 12.02 26.69 -14.67 NO NO NO NO NO ND NO NO NO NO NO NO - MW-3 07/05/00 12.02 26.60 -14.58 NO NO NO NO NO 9.55 ND NO NO NO ND NO - MW3 10/10/00 12.02 28.61 -16.59 NO NO NO NO NO 9.4 NO NO NO NO NO NO - MW3 01/22/01 12.02 28.52 -16.50 67 NO ND NO ND 14.8 NO NO NO NO ND NO ND MW3 D4/05/01 12.02 27.96 -15.94 NO NO NO NO ND 18.4 NO NO NO NO ND NO NO MW3 07/05/01 12.02 28.85 -16.83 NO NO NO NO NO 17 NO NO NO NO ND NO NO GHD 11193145(5)