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Table 5 <br /> Historical Vertical Groundwater Gradient Data <br /> Stockton Terminals Technical Committee <br /> Port of Stockton <br /> Stockton, California <br /> Well Bottom Groundwater Well Bottom Groundwater Hydraulic <br /> Elevation Elevation Elevation Elevation Monitoring Gradient <br /> feet MSL feet MSL feet MSL feet MSL Date feet er foot Notes <br /> Well Pair For Groundwater Zones C-1)(cont.) <br /> AR/MW-14C AR/MW-141) <br /> -79.25 -2.51 -109.88 -3.72 02/24/03 0.076 2 <br /> -79.25 -3.45 -109.88 -4.54 05/27/03 0.069 2 <br /> -79.25 -4.70 -109.88 -5.87 08/04/03 0.074 2 <br /> -79.25 -5.00 -109.88 -6.15 11/03/03 0.072 2 <br /> -79.25 -1.97 -109.88 -3.10 02/24/04 0.071 2 <br /> -79.25 -3.49 -109.88 -4.80 05/17/04 0.082 2 <br /> -79.25 -4.93 -109.88 -6.31 08/17/04 0.086 2 <br /> -79.25 -4.09 -109.88 -5.44 11/15/04 0.084 2 <br /> -79.25 -2.16 -109.88 -3.48 02/14/05 0.083 2 <br /> -79.25 -2.31 -109.88 -3.53 05/16/05 0.077 2 <br /> -79.25 -4.26 -109.88 -5.56 08/29/05 0.081 2 <br /> -79.25 -4.67 -109.88 -5.83 11/28/05 0.073 2 <br /> -79.25 -1.57 -109.88 -2.76 02/06/06 0.075 2 <br /> -79.25 -1.20 -109.88 -2.33 05/08/06 0.071 2 <br /> -79.25 -3.24 -109.88 -4.43 08/07/06 0.075 2 <br /> -79.25 -4.06 -109.88 -5.17 10/30/06 0.070 2 <br /> -79.25 -3.59 -109.88 -4.68 01/29/07 0.069 2 <br /> -79.25 -3.12 -109.88 -4.22 04/30/07 0.069 2 <br /> -79.25 -4.05 -109.88 -5.20 07/30/07 0.072 2 <br /> -79.25 -4.33 -109.88 -4.93 10/29/07 0.038 2 <br /> -79.25 -1.69 -109.88 -3.03 02/04/08 0.084 2 <br /> -79.25 -3.12 -109.88 -4.25 05/05/08 0.071 2 <br /> -77.11 -1.97 -107.60 -3.01 08/04/08 0.066 2 <br /> -77.11 -2.09 -107.60 -3.10 11/03/08 0.064 2 <br /> -77.11 -1.20 -107.60 -2.24 02/02/09 0.066 2 <br /> -77.11 -0.86 -107.60 -1.89 05/04/09 0.065 2 <br /> -77.11 -1.86 -107.60 -2.86 08/03/09 0.064 2 <br /> -77.11 -1.76 -107.60 -2.79 11/02/09 0.065 2 <br /> -77.11 -0.30 -107.60 -1.36 02/01/10 0.067 2 <br /> Notes: <br /> feet/MSL=Elevation in feet relative to mean sea level. <br /> 1 =Previously calculated historical gradient was erroneous.Vertical gradient re-calculated by SECOR by <br /> using the following formula: The difference of groundwater elevations from shallow zone well and deeper zone <br /> well divided by the difference of the center of the water column of the shallow zone well and the deeper zone <br /> well. <br /> 2=Vertical gradient calculated by using the following formula: The difference of groundwater elevations from <br /> shallow zone well and deeper zone well divided by the difference of the center of the water column of the <br /> shallow zone well and the deeper zone well. <br /> 3=Well not accessible. <br /> 4=Well not monitored. <br /> 5=Calculations using new survey information obtained during Fourth Quarter 2002. <br /> 6=TO/WC-1S no longer being monitored per MRP <br /> Positive vertical gradients denote downward flow;negative vertical gradients denote upward flow. <br /> Wells resurveyed in October 2008 and applied to data beginning July 2008.Vertical Datum based on NAVD88. <br /> 1Q10 STTC gwtables.xlsx Page 7 of 7 <br />