SITE INFORMATION AND CORRESPONDENCE_1993-2003

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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0213 • 6 U.S. DEPARTMENT OF DEFENSE DEFENSE LOGISTICS AGENCY DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN SHARPE GROUNDWATER REMEDIATION SYSTEM SAN JOAQUIN COUNTY b. French Camp Slough In reviewing what existing beneficial uses that may apply to French Camp Slough, the Regional Board has considered the following facts: 1) Domestic, Municipal, and Agricultural Supply The Regional Board is required to apply the beneficial uses of municipal and domestic supply to French Camp Slough based on SWRCB Resolution No. 88-63 which was incorporated into the Basin Plan pursuant to Regional Board Resolution 89-056. In addition, the SWRCB has issued water rights to existing water users along French Camp Slough downstream of the discharge for domestic and irrigation uses. As noted above, municipal and domestic supply are identified as existing beneficial uses of the Delta. 2) Water Contact and Non-Contact Recreation and Esthetic Enjoyment The Regional Board finds that the discharge flows through residential areas, and there is read public access to French Camp Slough. Exclusion of the public is unrealistic and contact recreational activities currently exist along French Camp Slough, these uses are likely to increase as the population in the area grows. 3) Groundwater Recharge In areas or at times when groundwater elevations are below the French Camp Slough bottom,water from the Slough will percolate to groundwater. Since flow in the SSJID Canal and French Camp Slough is at times minimal, it is reasonable to assume that the stream water originating from the SKID Canal is lost by evaporation, flow downstream and percolation to groundwater providing a source of municipal and irrigation water supply. 4) Freshwater Replenishment French camp Slough is in hydraulic continuity with the Delta, and flow is influenced by tidal conditions in the Delta. The water quality of French Camp Slough affects the quality of water in the Delta. 5) Preservation and Enhancement offish, Wildlife and Other Aquatic Resources. French Camp Slough flows to the Delta. Studies have suggested that French Camp Slough provides up to 5% of the flow to the San Joaquin River when the river flow is near 1000 cubic feet per second(cfs), though it could be up to 30% or more when the river flow drops to 150 cfs. Fish species present in French Camp Slough and the Delta are consistent with both cold and warm water fisheries. There are no significant barriers to aquatic organism movement or migration from the San Joaquin River and Delta to