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Table 3-1 Summary of Vertical Hydraulic Gradients Former Unocal Service Station No. 0187 437 East Minor Avenue Stockton, California -;:'U.1 2 -J C. U-13 DTW DTW DTW Vertical Gradient* DATE (feet) DATE (feet) DATE (feet) A to B B to C I 05131100'a 25.74 05/31/001" 32.59 05/31/00's 25.79 -0.001 08/31/00 26.43 08/31/00 27.02 08/31/00 26.51 -0.002 -0.011 11/20/00 27.03 11/20/00 27.43 11/20/00 27.05 0.000 -0.008 02/26/01 26.77 02/26/01 27.02 02/26/01 26.69 0.002 -0.007 05/14/01 26.57 05/14/01 25.87 05/14/01 26.53 0.001 0.014 08/13/01 27.21 08/13/01 28.11 08/13/01 27.57 -0.008 -0.012 11/26/01 28.39 11/26/01 29.05 11/26/01 28.60 -0.005 -0.010 02/25/02 27.89 02/25/02 28.29 02/25/02 28.03 -0.003 -0.006 05/07/02 27.91 05/07/02 28.40 05/07/02 27.97 -0.001 -0.009 08/12/02 28.96 08/12/02 30.44 08/12/02 29.70 -0.016 -0.016 11/05/02 30.36 11/05/02 31.00 11/05/02 30.56 -0.004 -0.009 02/04/03 30.04 02/04/03 30.11 02/04/03 30.55 -0.011 0.009 05/30/03 29.96 05/27/03 30.44 05/27/03 30.02 -0.001 -0.009 08/29/03 31.32 08/26/03 31.77 08/26/03 31.35 -0.001 -0.009 12/02/03 31.16 11/26/03 39.22111/26/03 34.52 02/16/04 31.00 02/16/04 31.67 02/16/04 31.24 -0.005 -0.009 04/19/04 30.71 04/19/04 31.21 04/19/04 30.75 -0.001 -0.010 08/16/04 32.20 08/16/04 33.07 08/16/04 32.52 -0.007 -0.012 11/15/04 32.75 11/15/04 33.28 11/15/04 32.80 -0.001 -0.010 02/14/051 32.82 02/14/05 32.351 02A 4/061 31.77 0.023 -0.012 Median -0.001 -0.009 Average -0.002 -0.008 Maximum 0.023 0.014 Minimum -0.016 -0.016 Interpretation Down Strongly Down Notes: 'Calculated as the difference in head divided by the vertical separation between well screens. Downward gradients are indicated by negative values. J:IRem_EnglProject Files1P60(6000-6999)16940-UNOCAL Portfolio Closure16940-UNOCAL Portfolio ClosurelSite 0187-Stockton East MinorlCSM ReportlSection 3 Tables.xls3-1 I t d