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Geosyntec O consultants 1. INTRODUCTION Geosyntec Consultants, Inc. (Geosyntec) has prepared this Well Destruction Work Plan (Work Plan) on behalf of the Lincoln Center Environmental Remediation Trust (the Trust) for the Lincoln Center property in Stockton, California (Site). This Work Plan summarizes the rationale and approach for selection and destruction of groundwater wells that no longer provide benefit to the remediation project being conducted at the Site. This Work Plan supplements the October 2020 Request to Modify Groundwater Monitoring Requirements at Lincoln Center(2020 Request) that was submitted to the Central Valley Regional Water Quality Control Board(CVRWQCB)on 19 October 2020(Appendix A). The purpose of the 2020 Request was to identify a path forward to modify the groundwater monitoring frequency and analytes at specific monitoring locations based on the remedial progress to date, to destroy wells that are no longer in use and to memorialize the process for future such requests. The request presented relevant background information, the decision-making process and a discussion of data assessed in support of proposed modifications to the groundwater monitoring programs and a list of wells that are no longer in use for destruction. Based on discussions with the CVRWQCB at the time, modifications to the monitoring program were prioritized as documented in the revised monitoring and reporting programs for the Site and, the well destructions were deferred. This Work Plan is a follow up to the 2020 Request on the deferred well destructions. 2. BACKGROUND Remediation at the Site is being conducted as part of a Site Response Plan as defined in the "Lincoln Center Environmental Remediation Trust Pollution Legal Liability Select Policy" dated 1 August 1998 and the "Amended First Final Order, Final Judgment and Order Terminating Permanent Injunction"and supporting Declaration(herein referred to as the Consent Decree) lodged with the United States District Court, Eastern District of California (the Court) on 15 May 2001. By definition, the Site Response Plan is a collective group of work plans and remedial action plans that describe the investigation and the clean-up to be undertaken at the Site. The Trust is responsible for directing and managing the cleanup of the Site pursuant to the Consent Decree. The current remedy and associated engineering, construction, and administrative activities conducted by or under the direction of the Trust are covered by Well Destruction Work Plan 1 June 27,2023