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Geosynte& consultants 1. INTRODUCTION Gcosyntec Consultants, Inc. (Geosyntec) has prepared this Pre-Design Site Investigation Work Plan (Work Plan) on behalf of the Lincoln Center Environmental Remediation Trust (LCERT) for additional soil and groundwater data collection in the area at and downgradient of the Lincoln Center in Stockton, California (Lincoln Center or site). This Work Plan is the next step in proceeding with the Site Response Plan as defined in the Lincoln Center Environmental Remediation Trust Pollution Legal Liability Select Policy dated August 1, 1998 and the Amended First Final Order, Final Judgment and Order Terminating Permanent Injunction (Consent Decree) and supporting Declaration dated May 15, 2001. The Work Plan has been prepared in accordance with the National Oil and Hazardous Substances Pollution Contingency Plan (NCP) and the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA). By definition, the Site Response Plan is a collective group of work plans and remedial action plans which describe the investigation and the cleanup activities to be undertaken at the site. Most recently, the Site Response Plan has been updated with the preparation of the Long-Term Remediation Strategy which was presented to and accepted by the Central Valley Regional Water Quality Control Board (CVRWQCB) in a meeting on 16 April, 2012. This Work Plan is a task included in the Long-Term Remediation Strategy. 1.1 WORK PLAN OBJECTIVE The objective of this Work Plan is to present the scope of work necessary to meet the data objectives presented herein. In general the three data objectives are: 1) lateral and vertical evaluation of the groundwater impacts and to improve the understanding of the site's hydrogeology; 2) assess the performance of the existing groundwater extraction systems; and 3) to aid in the evaluation, selection and design of the final remedial action. 1.2 WORK PLAN CONTENT Section 1.0 presents the introduction. Section 2.0 presents site background including historical information, a description of the geologic and hydrogeologic conditions, and summaries of the pertinent Interim Remedial Actions (IRAs). Section 3.0 presents the Work Plan objectives. Section 4.0 presents the scope of work including pre-field activities and the investigation activities. A project schedule is presented in Section 5.0. Section 6.0 lists references cited herein. Pre-Design Investigation Work Plan l 18.05.12