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Table 3-1 Summary of Vertical Hydraulic Gradients Former Unocal Service Station No. 0187 437 East Minor Avenue Stockton, California 7d�0 U-18 - y� U-19 Vertical -15 U-20 110-1U-21 Vertical DTW DTW Gradient* DTW DTW Gradient" DATE (feet) DATE (feet) B to C DATE (feet) DATE (feet) B to C 11/20/00 26.42 11/20-22/00 27.21 -0.020 11/20/00 27.37 11120/00 27.52 -0.003 ` 02/26/01 25.98 02/26/01 26.75 -0.019 02/26/01 27.00 02/26/01 27.06 -0.001 05/14/01 25.82 05/14/01 26.61 -0.020 05/14/01 26.76 05/14/01 26.88 -0.003 08/13/01 26.79 08/13/01 27.96 -0.029 08/13/01 27.73 08/13/01 28.09 -0.008 11/26/01 27.95 11/26/01 28.86 -0.023 11/26/01 28.92 11/26/01 29.18 -0.006 02/25/02 27.27 02/25/02 28.12 -0.021 02/25/02 28.25 02/25/02 28.41 -0.004 05/07/02 27.34 05/07/02 28.25 -0.023 05/07/02 28.32 05/07/02 28.51 -0.004 08/12/02 29.03 08/12/02 30.38 -0.034 08/12/02 29.96 08/12/02 30.49 -0.012 11/05/02 29.97 11/05/02 31.00 -0.026 11/05/02 31.04 11/05/02 31.38 -0.008 02/04/03 29.41 02/04/03 28.60 0.020 02/04/03 30.60 02/04/03 30.80 -0.005 05/27/03 29.30 05/27/03 30.22 -0.023 05/27/03 30.42 05/27/03 31.59 -0.027 08/26/03 30.65 08/26/03 31.56 -0.023 08/26/03 31.77 08/26/03 32.93 -0.027 12/02/03 34.32 12/01/03 39.16 02/16/04 30.60 02/16/04 31.43 -0.021 02/16/04 31.70 02/16/04 31.85 -0.003 04/19/04 31.11 04/19/04 31.01 0.002 04/19/04 31.25 04/19/04 31.36 -0.003 08/16/04 31.93 08/16/04 33.00 -0.027 08/16/04 32.96 08/16/04 33.31 -0.008 11/18/04 32.22 11/15/04 33.1 -0.022 11/15/04 33.30 11/15/04 33.55 -0.006 02/14/05 31.15 02/14/05 32.14 -0.025 02/14/05 32.37 02/14/05 32.67 -0.007 Median -0.023 Median -0.006 } Average -0.020 Average -0.008 Maximum 0.020 Maximum -0.001 Minimum -0.034 Minimum -0.027 Interpretation Strongly Downi Interpretation All Down Notes: 'Calculated as the difference in head divided by the vertical separation between well screens. Downward gradients are indicated by negative values. .1:111em_EnglProject Files1P60(6000-119991\6940-UNOCAL Portfolio Closure16940-UNOCAL Portfolio ClosurelSite 0187-Stockton East Minor\CSM ReportlSection 3 Tables.xls3-1 4