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WASTE DISCHARGE REQUIRE1Vi_ fS ORDER NO.R5-2004-XXXX -6- DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN. SHARPE WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY may reopen this Order to reconsider groundwater limitations and other requirements to comply with Resolution 68-16. Basin Plan,Beneficial Uses and Regulatory Considerations 28. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Edition, (hereafter Basin Plan) designates beneficial uses, establishes water quality objectives, contains implementation plans and policies for protecting waters of the basin, and incorporates by reference plans and policies adopted by the State Board. Pursuant to Section 13263(a) of the California Water Code,waste discharge requirements must implement the Basin Plan. 29. Surface water drainage from the WWTF is to the SSJID Canal. The canal is a surface drainage course that flows to the French Camp Slough upstream of the San Joaquin River and Delta. The Basin Plan identifies the following existing and potential beneficial uses of the San Joaquin River and the Delta downstream of the discharge: municipal and domestic supply, agricultural irrigation, agricultural stock watering, industrial process water supply, industrial service supply, body contact water recreation, other non-body contact water recreation, warm freshwater aquatic habitat, cold freshwater aquatic habitat, warm fish migration habitat, cold fish migration habitat, warm spawning habitat, wildlife habitat, and navigation. 30. The beneficial uses of underlying groundwater are municipal and domestic water supply, agricultural supply, and industrial service and process supply. 31. The Basin Plan establishes numerical and narrative water quality objectives for surface and groundwater within the basin, and recognizes that water quality objectives are achieved primarily through the Regional Board's adoption of waste discharge requirements and enforcement orders. Where numerical water quality objectives are listed,these are limits necessary for the reasonable protection of beneficial uses of the water. Where compliance with narrative water quality objectives is required, the Regional Board will, on a case-by-case basis, adopt numerical limitations in orders,which will implement the narrative objectives to protect beneficial uses of the waters of the state. 32. The Basin Plan identifies numerical water quality objectives for waters designated as municipal supply. These are the maximum contaminant levels(MCLS) specified in the following provisions of Title 22, California Code of Regulations: Tables 64431-A(Inorganic Chemicals) and 64431-B (Fluoride) of Section 64431, Table 64444-A(Organic Chemicals) of Section 64444, and Table 64449-A(Secondary Maximum Contaminant Levels-Consumer Acceptance Limits) of Section 64449. The Basin Plan's incorporation of these provisions by reference is prospective, and includes future changes to the incorporated provisions as the changes take effect. The Basin Plan recognizes that the Regional Board may apply limits more stringent than MCLs to ensure that waters do not contain chemical constituents in concentrations that adversely affect beneficial uses. 33. The Basin Plan contains narrative water quality objectives for chemical constituents,tastes and odors, and toxicity. The toxicity objective requires that groundwater be maintained free of toxic