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® Ca AVIN NEWSOM <br /> C'CJVFHN(]H <br /> Water Boards ENV E GAR CIA <br /> ENVIRONMENTAL PROTECTION <br /> Central Valley Regional Water Quality Control Board <br /> 26 March 2024 <br /> Andrew Richle <br /> Utilities Superintendent <br /> City of Lodi <br /> 2001 W. Turner Road <br /> Lodi, CA 95242 <br /> Arich1e(@1odi.gov <br /> ABANDONMENT OF GROUNDWATER MONITORING WELLS WORK PLAN, LODI PLUME <br /> AREAS, LODI, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff received <br /> the 23 March 2024 Abandonment of Groundwater Monitoring Wells Work Plan (Work Plan) <br /> prepared by Civil Hydro Tech (CHT) on the behalf of the City of Lodi Public Work Department <br /> (City). The City submitted the Work Plan to provide general description of groundwater monitoring <br /> well (well) abandonment (destruction) of wells no longer providing meaningful data associated <br /> with the various Lodi volatile organic compound (VOC) groundwater plumes. <br /> The combined VOC plume well network consisted of 76 groundwater monitoring wells constructed <br /> in four varying groundwater depth zones. Of these wells, forty (40) were installed in the Shallow <br /> Zone, thirteen (13) were installed in the Intermediate Zone, seven (7) were installed in the Deep <br /> Zone, and sixteen (16) were installed in the Deeper Zone. On 29 January 2024, the Central Valley <br /> Water Board issued a revised Monitoring and Reporting Program (MRP) Order No. <br /> R5- 2024- 0800, removing 20 wells from the sampling program that no longer provide significant <br /> VOC plume information. The Work Plan summarizes the wells to be destroyed which correlate to <br /> those wells removed from the monitoring network. <br /> The Work Plan includes the following components: <br /> 1. Pre-Field Work Activities; <br /> • Health and Safety Plan Preparation; <br /> • Site Access and Permitting (encroachment and well destruction); and, <br /> • Notification; <br /> 2. Well Abandonment (destruction) Activities; <br /> 3. Waste Management; <br /> 4. Reporting; and <br /> 5. Scheduling <br /> MARK BRADFORD, CHAIR I PATRICK PULUPA, EsQ., EXECUTIVE OFFICER <br /> 11020 Sun Center Drive#200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />