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the western border of the site. This ditch then empties into Weber Slough, which forms the southern border of the site. Weber Slough even- tually drains into Littlejohns Creek. Flooding Potentia] The western and southern portion of the project area is within the boundaries of the 100-year floodplain of Weber Slough. This area is subject to a flooding depth of approximately one foot (U.S. Department of Housing and Urban Development 1980) . Figure 3.4 shows the area subject to inundation. There is no potential for flooding in the project area due to the failure of dams near San Joaquin County (San Joaquin County Planning Department 1978) . i Groundwater In the greater Stockton area, water supplies are derived from both surface water and groundwater sources. Groundwater is the source for nearly all domestic water utilized both inside the city limits and in the surrounding county area. Groundwater is the predominant agricultural water source although surface supplies have recently been imported to augment groundwater supplies (Reese-Chambers 1988) . This has resulted in land subsidence and the migration of low quality saline groundwater from the delta area to the east toward Stockton (Department of Water Resources 1980) . Long-term plans for water resources in the region include using greater amounts of surface water to offset the demand for groundwater. The groundwater depth at the project site is between 70 and 80 feet based on a map of lines of equal depth of water in wells in the spring of 1987 (San Joaquin County Flood Control and Water Conservation District 1987) . Wells in the area are normally 500 to 600 feet deep and are sufficient to provide flows up to 2,000 gallons per minute continuously (Clark Well & Equipment Company, Inc. 1987) . Refer to the Public Services section of the EIR for a more complete discussion of water supply. 3-39 101-45.R4 4/10/89