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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 A 09/22/92 0.002 1 06/13/94 0.002 to 0.005 -- 1 03/13/95 0.003 to 0.009 1 02/12/96 0.002 to 0.01 1 06/05/96 0.002 to 0.006 1 12/12/96 0.001 to 0.003 1 09/02/97 0.0025 to 0.003 1 12/18/97 0.005 to 0.0061 1 1 09/14/98 0.003 1 -- 03/16/99 0.002 1 08/18/99 0.002 1 11/15/99 0.001 1 02/04/00 0.003 1 05/15/00 0.001 1 08/02/00 0.001 1 11/13/00 0.001 1 02/12/01 0.001 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 0.014 to 0.01 1 07/29/02 0.016 to 0.009 1 1 1 10/28/02 0.002 to 0.063 1 1 1 1 02/24/03 0.002 to 0.02 -- 1 1 1 1 05/27/03 0.008 to 0.02 1 1 1 1 08/04/03 0.003 to 0.036 1 1 1 1 11/03/03 0.001 to 0.02 -- 1 1 1 1 1 02/24/04 0.002 to 0.2 1 -- - -- - -- 1 05/17/04 0.008 to 0.022 -- -- 08/17/04 0.002 to 0.035 -- 1 - -- 11/15/04 0.005 to 0.01 - -- 1 1 1 1 -- 1 02/14/05 0.002 to 0.02 1 1 1 1 05/16/05 0.002 to 0.035 1 -- -- 1 1 08/29/05 0.003 to 0.017 1 1 1 1 1 1 11/28/05 0.005 to 0.04 -- 1 1 1 -- -- 02/06/06 0.0166 to 0.007 1 1 1 1 - -- 05/08/06 0.007 to 0.014 -- -- 1 1 -- - -- 08/07/06 0.018 to 0.03 -- 1 - -- - -- 10/30/06 0.02 to 0.031 -- 1 - -- -01/29/07 0.014 to 0.07 -- -- 1 - -- 04/30/07 0.038 to 0.09 -- -- 1 - -- 07/30/07 0.007 to 0.02 -- -- - 1 - -- 10/29/07 0.0004 to 0.009 -- 1 - -- - -- 02/04/08 0.003 to 0.01 -- 1 - -- - -- 05/05/08 0.0003 to 0.005 -- 1 -- 1 -- - -- 08/04/08 0.002 to 0.004 -- 1 1 1 1 -- - -- 1 11/03/08 0.002 to 0.004 1 1 -- 1 1 1 - -- 1 02/02/09 0.002 to 0.008 1 1 1 -- -- - -- 05/04/09 0.005 to 0.007 1 1 1 -- - -- 08/03/09 0.003 to 0.005 1 1 1 -- -11/02/09 0.003 -- 1 - -- - -- 02/01/10 0.001 to 0.007 1 1 1 -- - -- Average 0.013 9 18 12 23 12 1 6 1 0 5 4 9 5 8 1Q10 STTC gwtables.xlsx Page 1 of 4