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Table 4 Historical Horizontal Groundwater Gradient Data Stockton Terminals Technical Committee Port of Stockton Stockton, California Ground- Hydraulic Approximate water Monitoring Gradient Flow Direction Zone Date (feet per foot) S SE S/SE E E/SE SW S/SW W/SW W NE N/NW ENE B 09/22/92 0.004 1 -- 1 06/13/94 0.002 to 0.004 -- 1 -- 03/13/95 0.001 to 0.005 1 02/12/96 0.005 1 06/05/96 0.005 1 12/12/96 0.0036 to 0.0037 1 09/22/97 0.002 1 1 12/08/97 0.002 to 0.005 1 1 09/14/98 0.003 1 1 03/16/99 0.002 1 08/18/99 0.001 1 11/15/99 0.001 1 02/04/00 0.002 -- 1 05/15/00 0.001 -- 1 08/02/00 0.001 -- 1 11/13/00 0.002 -- 1 02/12/01 0.002 -- 1 05/07/01 0.001 -- 1 08/20/01 0.001 -- 1 11/29/01 0.001 -- 1 02/04/02 0.001 -- 1 05/01/02 0.015 to 0.004 -- 1 -- 07/29/02 0.01 1 -- 1 10/28/02 0.001 to 0.008 1 1 1 -- 02/24/03 0.002 to 0.02 -- 1 1 1 1 05/27/03 0.002 to 0.02 -- 1 1 1 1 08/04/03 0.001 to 0.017 -- 1 1 1 1 1 1 11/03/03 0.001 to 0.068 -- 1 1 1 1 1 1 02/24/04 0.002 to 0.01 -- 1 -- -- 1 -- -- 05/17/04 0.008 to 0.033 -- -- 1 -- 08/17/04 0.001 to 0.02 -- 1 -- 11/15/04 0.002 to 0.038 -- 1 1 02/14/05 0.002 -- 1 -- 05/16/05 0.002 -- 1 08/29/05 0.004 to 0.01 -- 1 11/28/05 0.004 to 0.017 1 -- 1 1 02/06/06 0.004 to 0.007 -- -- 1 -- 05/08/06 0.005 to 0.013 -- 1 08/07/06 0.002 to 0.04 1 -- 10/30/06 0.004 to 0.031 1 01/29/07 0.004 to 0.012 1 04/30/07 0.003 to 0.014 1 07/30/07 0.004 to 0.017 1 10/29/07 0.0014 to 0.005 1 02/04/08 0.0006 to 0.004 1 05/05/08 0.0016 to 0.007 1 1 1 1 08/04/05 0.001 to 0.003 -- 1 -- 11/03/08 0.002 to 0.005 1 -- 02/02/09 0.002 to 0.003 1 1 05/04/09 0.002 to 0.005 1 1 08/03/09 0.003 to 0.006 1 1 11/02/09 0.001 to 0.003 1 -- 02/01/10 0.003 to 0.005 1 -- Average 0.007 1 2 1 22 5 3 28 4 0 1 1 10 6 4 1Q10 STTC gwtables.xlsx Page 2 of 4