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CIVIL UYIDUo TUCV Gw�G E�wir� Wader Re;~ce�/Dcwni4eri ng March 23, 2024 SENT VIA: EMAIL Mr. Robert Fagerness, PE Water Resource Control Engineer—Private Sites Cleanup Unit Central Valley Regional Water Quality Control Board 11010 Sun Center Drive, #200 Rancho Cordova, CA 95670 SUBJECT: Abandonment of Groundwater Monitoring Wells Work Plan Lodi Plume Areas,Lodi, California Dear Mr. Fagerness: On behalf of the City of Lodi, Public Works Department (City), Civil Hydro Tech, LLC (CHT) has prepared this Work Plan for abandoning groundwater monitoring wells located in Lodi, California (Figures 1 and 2). These groundwater monitoring wells are no longer being used to monitor the various groundwater volatile organic compound (VOC) plumes beneath the City of Lodi under the revised Monitoring and Reporting Program (MRP) Order No. R5-2024-0800, which was issued by the California Regional Water Quality Control Board, Central Valley Region (Water Board) on January 29, 2024. The City is requesting the Water Board to approve this Work Plan as part of the City' ongoing efforts to monitor the different VOC plumes. BACKGROUND In the late 1980s,volatile organic compounds(VOCs)tetrachloroethene(PCE)and trichloroethene (TCE) were discovered in two of the City's drinking water supply wells. Further investigations in the early 1990s, conducted by the Water Board under the Well Investigation Program, revealed several areas where VOCs from dry cleaning and other commercial operations had impacted groundwater. Subsequent investigations conducted by consultants for the City, Guild Cleaners, Inc. (Guild), and other parties identified the source of the PCE and TCE impacts within the Lodi Central Plume (LCP) area. On April 22, 2004, the Water Board adopted Cleanup and Abatement Order No. R5-2004-0043 (CAO), which named specific assessment, mitigation and reporting activities, goals and schedules that were expected to be carried out by the potential responsible parties (PRPs) involved with the LCP. On April 17, 2008, the Water Board issued the Monitoring and Reporting Program (MRP) Order No. R5-2008-0813, which complied with the requisite sections of the CAO, for monitoring the LCP area. On March 3, 2011, the Water Board approved the Review of Groundwater Monitoring Program Plan for the Western and Southern Plume Areas, which included monitoring of both the Lodi Western Plume (LWP) and Lodi Southern Plume (LSP) areas. During subsequent years, nested monitoring wells were installed in the LWP, LSP, and Lodi Northern Plume (LNP) areas, and the MRP was revised to include monitoring and reporting of the LWP, LSP, and LNP areas. 581 MONTEGO TERRACE,SUNNYVALE,CA 94089 TEL:415-424-3009