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Table 9 <br />Vertical Gradient Data-Paired Wells <br />Zones A-B-C-D <br />Southshore Parcels-Parcels 2A and Adjacent Areas <br />West Weber Avenue and North Lincoln Street <br />Stockton, California <br />Groundwater Groundwater Monitoring Hydraulic <br />Well DTB Elevation Well DTB Elevation Date Gradient <br />(feet MSL) (feet MSL) (feet MSL) (feet MSL) (foot per foot) <br />MW-67 MW-74 <br />-73.17 -8.40 -118.06 -8.55 10/20/08 0.007 <br />-73.17 -8.03 -118.06 -8.11 1/19/09 0.004 <br />-73.17 -7.09 -118.06 -7.26 4/20/09 0.008 <br />-73.17 -8.06 -118.06 -7.26 7/27/09 -0.036 <br />-73.17 -8.14 -118.06 -8.32 10/19/09 0.008 <br />-73.17 -7.54 -118.06 -7.72 1/18/10 0.008 <br />-73.17 -5.84 -118.06 -6.01 4/19/10 0.008 <br />-73.17 -6.90 -118.06 -7.09 7/19/10 0.008 <br />-73.17 -7.82 -118.06 -7.99 10/18/10 0.008 <br />-73.17 -5.78 -118.06 -5.94 1/24/11 0.007 <br />-73.17 -4.37 -118.06 -4.60 4/18/11 0.010 <br />-73.17 -4.90 -118.06 -5.05 7/18/11 0.007 <br />-73.17 -5.78 -118.06 -5.95 10/17/11 0.008 <br />-73.17 -5.77 -118.06 -5.89 1/17/12 0.005 <br />Explanations: <br />Well DTB = Well depth to bottom <br />DTW = Depth ot water <br />feet/MSL = Elevation in feet relative to mean sea level. <br />1Monitoring well destroyed by construction activities. Needs to be resurveyed. <br />NA - Not Available <br />Vertical gradient calculated by using the following formula: The difference of groundwater elevations <br />from shallow zone well and deeper zone well divided by the difference of the center of the water <br />I:\Tidewater\TW Stockton (P2A)\Tables\QMR Tables\2012\1Q12\Parcel2A (Tables 8,9) Historical Water Levels 1Q12.xls Page 8 of 8