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Re-Revised Groundwater Monitoring Well Construction <br /> Workplan <br /> August2023 <br /> Background <br /> The San Joaquin County Public Works Department is the lead agency for the TSb Sustainable <br /> Groundwater Management Act implementation. The Subbasin is being managed by six <br /> Groundwater Sustainability Agencies (GSAs): BCID, Byron Bethany Irrigation District, the <br /> cities of Tracy and Lathrop, San Joaquin County, and Stewart Tract. Together they created and <br /> adopted the TSb GSP. <br /> During preparation of the GSP, groundwater levels in the Upper and Lower aquifers were <br /> evaluated. Some existing monitoring wells (irrigation supply wells)were found to have <br /> inadequate sanitary seals and gravel packs crossing the Corcoran Clay. Groundwater levels in <br /> these wells, though penetrate below the Corcoran Clay, had ground water levels representative of <br /> the Upper Aquifer. The GSP identified the need for dedicated monitoring wells to resolve <br /> groundwater levels in the Upper and Lower aquifers. <br /> In 2019, the GSAs applied to DWR for Technical Support Services to construct new monitoring <br /> wells in the Subbasin. In 2022, DWR committed to drilling up to six new monitoring wells in the <br /> Subbasin, including MW-203. <br /> GEI Consultants, Inc. 4 <br />