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BUILDING 16 FORMER USTS GROUND WATER INVESTIGATION WORK PLAN PORT WEST COMPLEX, ROUGH AND READY ISLAND, PORT OF STOCKTON 1. INTRODUCTION Environmental Risk Services Corporation (ERSC) prepared this Building 16 Former LISTS Ground Water Investigation Work Plan (Work Plan) on behalf of the Port of Stockton (Port) and pursuant to the May 18, 2004 request by the California Regional Water Quality Control Board — Central Valley Region (RWQCB). Building 16 is located on Rough and Ready Island (RRI) and within Port of Stockton's Port West Complex in Stockton, California (Figure 1). Specifically, Building 16 (Site) is located in the eastern portion of RRI and immediately south of the main entrance road (Figure 2). The Port currently owns and operates RRI and the 2001 master plan calls for significant redevelopment of RRI, including the Building 16 site. In summary, the United States Department of the Navy (Navy) developed the Site as a gasoline station in 1963 and removed three underground storage tanks (USTs) and associated product pipelines and dispensers in 1997. Soil samples collected from the excavation revealed a release of petroleum hydrocarbons and ground water samples collected from the Site reveal declining concentrations of petroleum hydrocarbons in ground water. However, there remain concerns regarding the distribution of petroleum hydrocarbons in ground water. This Work Plan presents the data collected to date and proposes an investigation of ground water quality at and downgradient from the Site. 2. SETTING 2.1 ROUGH AND READY ISLAND Rough and Ready Island is located along the eastern margin of the Sacramento-San Joaquin Delta (Delta) formed by the confluence of several rivers, including the San Joaquin, Sacramento, Mokelumne, Calaveras, and Consumnes Rivers (Figure 1). The island consists of 1,459 relatively flat acres that were originally marshy grassland. The legal definition of the Delta,pursuant to the California Water Code Section 12220, includes RRI. The United States military first established presence on the island after World War I. During World War II, the military commissioned RRI as the U.S. Naval Supply Annex, Stockton. Following the end of the Korean conflict, supply depot activity slowed and the command changed over time. The Naval Computer and Telecommunications Station San Diego Detachment Stockton (NCTS Stockton) managed the depot until July 2002, when Navy operations ceased. Environmental Risk Services,Corp.