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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 e <br /> Bottom Groundwater I Bottom Groundwater Hydraulic <br /> Elevation Elevation Elevation Elevation Monitoring Gradient <br /> feet MSL feet MSL feet MSL feet MSL Date feet per foot Notes <br /> Well Pair For Groundwater Zones C-D (cont.) <br /> AR/MW-14C AR/MW-14D <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 /> Explanations: <br /> feeUMSL=Elevation in feet relative to mean sea level. <br /> 1 = Previously calculated historical gradient was erroneous.Vertical gradient re-calculated by SECOR by using <br /> the following formula: The difference of groundwater elevations from shallow zone well and deeper zone well <br /> divided by the difference of the center of the water column of the shallow zone well and the deeper zone 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 shallow <br /> 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 the Fourth Quarter of 2002. <br /> 6=TO/WC-1 S 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 /> 1Q09 STTC gwtables.xls Page 8 of 8 <br />