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Re-Revised Groundwater Monitoring Well Construction <br /> Workplan <br /> August 2023 <br /> Groundwater Flow Directions <br /> Groundwater level data from 23 wells within the Subbasin were used to create the Upper Aquifer <br /> groundwater elevation contour maps with another 10 wells from surrounding subbasins. <br /> Groundwater level data from 18 wells within the Subbasin were used to create the Lower <br /> Aquifer groundwater elevation contour maps with another seven wells from surrounding <br /> subbasins. <br /> Groundwater contours for the Upper Aquifer show the groundwater is at a higher elevation, <br /> about 190 feet above mean sea level (amsl)near the foothills and lower elevations (about 0- <br /> 10 feet amsl)near the rivers. The groundwater flow direction is generally to the northwest over <br /> most of the Subbasin, as shown on Figure 5. At the drill site, the flow direction is toward the <br /> east-northeast. <br /> Spring 2022 groundwater contours for the Lower Aquifer are shown on Figure 6. Overall, <br /> Groundwater flow direction is generally to the northwest. A pumping depression was present <br /> near the center of the Subbasin, likely due to the city of Tracy having five municipal supply <br /> wells in this area. The regional groundwater flow direction is from the southeast to the <br /> northwest, but due to the pumping depression, radial flow into the depression is from the east, <br /> west, and north. At the drill site, the groundwater flow direction is from the southeast to the <br /> northwest. <br /> GEI Consultants, Inc. 11 <br />