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Geosyntec l> consultants 1. INTRODUCTION Geosyntec Consultants, Inc. (Geosyntec) has prepared this Groundwater Monitoring Work Plan (GMWP) for Rough and Ready Island (RRI) located in Stockton, California (Figure 1) on behalf of the Port of Stockton (Port). This GMWP proposes a comprehensive groundwater monitoring program for RRI and presents a work plan to address data gaps identified in the RRI groundwater monitoring network. The Port received comments on the GMWP submitted on 9 April 2018 from the California Environmental Protection Agency Department of Toxic Substances Control (DTSC) on 11 May 2018 and the Regional Water Quality Control Board(RWQCB)on 14 May 2018. This GMWP has been revised based on the DTSC and RWQCB comments. A response to comments is included as Appendix A. Geosyntec performed technical evaluations in the development of this GMWP, including preparing a revised hydrogeologic conceptual site model (CSM) for RRI, three- dimensional (313) C Tech Development Corporation (C Tech)'s Earth Volumetric Studio® (EVS(g) modeling of the distribution of constituents of concern (COCs) in groundwater, and statistical evaluation of COC concentration trends over time. The technical evaluations are documented in this GMWP along with the proposed groundwater monitoring program for RRI and work plan to address groundwater monitoring data gaps identified from the technical evaluation. 1.1 Background The United States of America Department of the Navy(Navy)operated at RRI from 1943 until 2000 (Tetra Tech 2002). The Navy began transferring properties at RRI to the Port in July 2000 through the United State Department of Transportation Maritime Administration (Tetra Tech EM, Inc. [Tetra Tech], 2002). In 2003, RRI was transferred to the Port under Environmental Services Cooperative Agreement (ESCA) N62474-03- 2-001 between the Port and the Navy. The first military installation at RRI was an Army Camp built after World War I to rehabilitate wounded veterans(Kleinfelder, 1988).The Navy subsequently took over RRI in 1943,and in 1945 developed RRI into a major supply depot(Kleinfelder, 1988).Naval communication station operations began at RRI in 1960, and by 1965 the supply depot operations were deactivated and RRI was assigned to the Naval Computer and Telecommunications Station San Diego Detachment Stockton (Kleinfelder, 1988). RRI Groundwater Monitoring Work Plan 1 1 June 2018