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WASTE DISCHARGE REQUIRtMENTS ORDER NO. ✓ S GOLDSTONE LAND COMPANY,LLC AND KURT KAUTZ BEAR CREEK WINERY SAN JOAQUIN COUNTY BASIN PLAN, BENEFICIAL USES, AND REGULATORY CONSIDERATIONS 42, 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 Water Resources Control Board. Pursuant to §13263(a) of the California Water Code (CWC), waste discharge requirements must implement the Basin Plan. 43. Surface water drainage is to Pixley Slough, a tributary of the Sacramento-San Joaquin Delta. The beneficial uses of the San Joaquin River(within the Sacramento-San Joaquin Delta Hydrologic Area) are municipal supply, domestic supply, agricultural irrigation, contact recreation, other noncontact recreation,warm fresh water habitat, cold fresh water habitat,warm water migration, cold water migration, warm water spawning, wildlife habitat, and navigation. 44. The beneficial uses of underlying groundwater are municipal and domestic water supply, agricultural supply, industrial service supply, and industrial process supply. 45. State Water Resources Control Board (State Board)Resolution No. 68-16 requires that the Regional Board, in regulating the discharge of waste, must maintain high quality waters of the State until it is demonstrated that any change in quality will be consistent with maximum benefit to the people of the State,will not unreasonably affect beneficial uses, and will not result in water quality less than that described in the State Board's policies (e.g., quality that exceeds water quality objectives). 46. The Basin Plan establishes numeric and narrative water quality objectives for surface and groundwater within the basin. Numeric water quality objectives are limits already quantified. Narrative water quality objectives are unquantified limits expressing the level of protection for beneficial uses from specific constituents and categories of constituents. Objectives for chemical constituents, toxicity, and tastes and odors of substances in groundwater take both forms. The toxicity objective requires that groundwater be maintained free of toxic substances in concentrations that produce detrimental physiological responses in humans,plants, or animals. The chemical constituent objective states groundwater shall not contain chemical constituents in concentrations that adversely affect any beneficial use. 47. The Basin Plan sets forth a procedure for translating narrative water quality objectives into numeric water quality objectives, directing that relevant numeric criteria and guidelines developed and published by other agencies and organizations and any other relevant information be considered. 48. The CWC requires that waste discharge requirements implement the Basin Plan and consider the beneficial uses and water quality objectives reasonably required to protect the uses, as well as other waste discharges and conditions in the area and groundwater. The Basin Plan requires that waste discharge requirements apply the most stringent objective for each constituent to ensure that discharges do not cause groundwater to contain a chemical constituent, toxic substance, radionuclide,pesticide, or taste or odor producing substance in a concentration that adversely V.\5an Joaquin NonISSuIflOMicnNrgcn Filrs\Brar Crttk\VlDRdoc