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Table 6 <br /> Historical Vertical Groundwater Gradient Data <br /> Stockton Terminals Technical Committee <br /> Port of Stockton <br /> Stockton, California <br /> Well Groundwater Well Groundwater Monitoring Hydraulic <br /> Bottom Elevation Bottom Elevation Date Gradient Notes <br /> Elevation Elevation <br /> feet MSL) (feet MSL feet MSL feet MSL (feet per foot) <br /> Well Pair For Groundwater Zones C-D cont.) <br /> AR/MW-14C AR/MW-14D <br /> -78.64 -2.56 -109.4 -3.46 05/07/01 0.057 1 <br /> -78.64 -4.09 -109.4 -5.02 08/20/01 0.059 1 <br /> -78.64 -4.41 -109.4 -5.32 10/29/01 0.057 1 <br /> -78.64 -2.19 -109.4 -3.14 02/04/02 0.060 1 <br /> -78.64 -2.73 -109.4 -3.55 05/01/02 0.052 2 <br /> -78.64 -4.07 -109.4 -5.04 07/29/02 0.061 2 <br /> -79.25 -4.92 -109.88 -6.03 10/28/02 0.070 2,5 <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 -109.86 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 -1.57 -109.88 -2.76 02/06/06 0.075 2 <br /> Explanations: <br /> eet/MSL=Elevation in feet relative to mean sea level. <br /> 1 =Vertical gradient re-calculated by SECOR by using the following formula: The difference of groundwater <br /> elevations from shallow zone well and deeper zone well divided by the difference of the center of the water column <br /> of the shallow zone well and the deeper zone well. <br /> 2=Vertical gradient calculated by SECOR by using the following formula: The difference of groundwater <br /> elevations from shallow zone well and deeper zone well divided by the difference of the center of the water column <br /> of the shallow zone well and the deeper zone well. <br /> 3=Well not accessible. <br /> =Well not monitored. <br /> 5=Calculations using new survey information obtained during the Fourth Quarter of 2002. <br /> • <br /> l:%STTC\Tables=05 QMR\4Q05\01Q06 STTC gwtables.xls\Table 6(vert gradient) Page 5 of 5 <br />