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Work Plan, PFAS Site Inspection Naval Computer and Telecommunications Station Stockton, California Background Information 2-1 DCN: TRBW-0202-5183-0010 Section 2 Background Information 2.1 Physical Setting 2.1.1 Site Location, Current and Future Land Use Historically, NCTS Stockton occupied 1,490 acres of RRI, which lies west of the City of Stockton and is bounded by the San Joaquin River to the east, the Stockton Deep Water Channel to the north, and Burns Cutoff to the south (Figure 1-1). In February 1996, under Public Law 104-160, Section 2871, Congress passed special legislation that transferred the NCTS Stockton property and assets to the Port of Stockton for reuse as a maritime facility under an Environmental Services Cooperative Agreement (ESCA) between the Port of Stockton and the Navy. The NCTS Stockton facility remained under Navy management until July 2000, when Navy operations ceased. NCTS Stockton is informally categorized into four areas based on land use: 1) Landfill Area, 2) Warehouse Area, 3) Administrative Area, and 4) Agricultural Area (ERS 2005). The Port of Stockton is the current property owner, and land use is commercial/industrial. A covenant and agreement to restrict use of the property is recorded with the deed and executed between the Navy, the Port of Stockton, the DTSC, and the Water Board. Future use is expected to remain the same as current use. 2.1.2 Climate The Stockton area has a mild climate moderated by flow of marine air from the coast through the Sacramento-San Joaquin Delta to the Central Valley. The average daily temperature is 62 degrees Fahrenheit (°F), with an annual average high temperature of 75.7°F and annual average low temperature of 48.3°F. Average annual precipitation is 17.85 inches, with about 90 percent of rainfall occurring between November and April (US Climate Data 2015). 2.1.3 Topography and Drainage Portions of RRI lie below mean sea level (msl); the island's perimeter consists of a levee that prevents flooding by tidal waters in surrounding channels. Average ground surface elevations at NCTS Stockton vary from about 7 feet below msl on the west to about 0 to 4 feet above msl over the central, southern, and eastern parts of NCTS Stockton. A few points near the northeastern corner of NCTS Stockton reach 12 feet above msl, and levee crest elevations average 12 to 18 feet above msl (PRC Environmental Management, Inc. [PRC] 1997). Consistent with topography, drainage on the island flows generally from east to west and has been organized into a rectilinear system of interior drainage channels. In general, these channels were excavated from native soils and are unlined, although limited reaches are lined with concrete. Interior drainage channel depths range from a few feet in the central part of the island to 10 to 12