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C 1l1f ORN1• <br />Water Boards <br />Central Valley Regional Water Quality Control Board <br />3 August 2023 <br />Joe Niland <br />Lincoln Center Environmental Remediation Trust <br />3043 Gold Canal Drive, Suite 201 <br />Rancho Cordova, CA 95670 <br />GAVIN NEWSOM <br />GOVERNOR <br />JARED <br />BBLLUMENFELO <br />FOR <br />ENVIRONMENTAL PROTECTION <br />REVIEW OF WELL DESTRUCTION WORK PLAN, LINCOLN VILLAGE SHOPPING <br />CENTER, STOCKTON, SAN JOAQUIN COUNTY <br />Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff <br />reviewed the 27 June 2023 Well Destruction Work Plan (Work Plan) prepared by <br />Geosyntec on behalf of the Lincoln Center Environmental Remediation Trust (Trust) for the <br />Lincoln Village Shopping Center in Stockton (Site). The Work Plan summarizes the <br />rationale and approach for selection of wells that no longer benefit the project and can be <br />destroyed. <br />The Work Plan states there are over 100 piezometers, groundwater monitoring, extraction, <br />injection, and other wells at the Site. The Trust is proposing to iteratively decommission <br />wells at the Site that no longer provide a benefit in assessing the remedy. The Work Plan <br />includes a decision tree to provide a framework for the process to evaluate the wells <br />proposed for destruction. The wells proposed for destruction include: <br />• 8 wells previously identified for destruction in 2020, <br />• 10 piezometers near the edge of the plume, and <br />• 22 wells previously used for Enhanced Reduction Dechlorination (ERD) injections. <br />The Trust evaluated each of the 40 wells according to the decision tree and found that they <br />met the following conditions: <br />• Either redundant to another equivalent well; exhibited stable or decreasing <br />concentrations for about two years; or damaged beyond repair. <br />• Not needed to define the plume extent or boundary. <br />• Not located within the current plume footprint (or treatment zone). <br />• Not needed to evaluate remedy performance. <br />• Does not provide groundwater flow information relevant to the remedy. <br />• Well destruction does not impact nearby wells (nested/co-located wells) that are <br />needed for assessment. <br />KARL E. LONGLEV SCD, P.E., CHAIR I PATRICK PULUPA, ESQ., EXECUTIVE OFFICER <br />11020 Sun Center Drive #200, Rancho Cordova, CA 95670 1 www.waterboards.ca.gov/centralvalley <br />