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Re-Revised Groundwater Monitoring Well Construction <br /> Workplan <br /> August 2023 <br /> Introduction <br /> Monitoring well (MW) MW-203 is a proposed 4-level nested monitoring well which will aid in <br /> implementation of the Tracy Subbasin(TSb or Subbasin) Groundwater Sustainability Plan <br /> (GSP),by filling a groundwater level data gap associated with aquifers above (Upper Aquifer) <br /> and below (Lower Aquifer). Both aquifers are separated by the Corcoran Clay in the <br /> southeastern portion of the Subbasin and are located outside of existing dedicated monitoring <br /> well networks. The MW-203 monitoring well will be used to measure groundwater levels; to <br /> develop groundwater contours (along with other existing monitoring wells); and to assess change <br /> in groundwater storage. Water quality samples will be obtained from the wells shortly after <br /> construction and will be analyzed for general minerals, nitrate, and metals to further characterize <br /> groundwater quality in the Subbasin. <br /> Banta-Carbona Irrigation District(BCID) is the owner of the property. The drilling will be <br /> performed by Eaton Drilling (Eaton)who is under contract by the California Department of <br /> Water Resources (DWR). The work is being performed under DWR's Technical Services <br /> Support program. GEI Consultant's, Inc., is helping to coordinate activities and has prepared this <br /> workplan. <br /> GEI Consultants, Inc. 2 <br />