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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0148 - 12- MUSCO FAMILY OLIVE COMPANY AND THE STUDLEY COMPANY WASTEWATER TREATMENT AND LAND DISPOSAL FACILITY SAN JOAQUIN COUNTY within 6.4 to 8.4 to protect crops from damage by food processing wastewater. Near neutral pH is also required to maintain adequate active microbial populations in the soil. BASIN PLAN, BENEFICIAL USES, AND REGULATORY CONSIDERATIONS 57. 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 Section 13263(a) of the California Water Code, waste discharge requirements must implement the Basin Plan. 58. The Regional Board's Basin Plan establishes the beneficial uses of the waters of the Sacramento San Joaquin Delta. These beneficial uses are municipal and domestic supply, irrigation, stock watering, industrial process and service supply, contact recreation, other non-contact recreation, warm and cold freshwater habitat, warm and cold migration, warm water spawning, and navigation. 59. The beneficial uses of underlying groundwater are domestic and municipal supply, agricultural supply, industrial service supply, and industrial process supply. 60. 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 in, and toxicity and tastes and odors of, 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. 61. The Basin Plan sets forth a procedure for translating narrative water quality objectives into numeric water quality limits, directing that relevant numeric criteria and guidelines developed and published by other agencies and organizations and any other relevant information be considered. 62. 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 affects any beneficial use. 63. The Basin Plan procedure for applying water quality objectives as terms of discharge in waste discharge requirements requires maintenance of the existing quality of groundwater except where