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WASTE DISCHARGE REQUIREMENTS ORDER R5-2013-0028 -16- DELICATO VINEYARDS, INC. DELICATO FAMILY VINEYARDS SAN JOAQUIN COUNTY Quality 95% UCL 95% UCL Objective EC prnhos/cm 1,077 1,141 700 to 2,200 TDS m /L 724 735 450 to 1,500 TKN m /L 1.35 1.40 -- NO3-N m /L 23.9 11.2 10 UCL = Upper Confidence Limit for the mean. 62. Review of the statistical analyses presented above compared to the results for downgradient monitoring wells from 2002 to 2011 indicates that groundwater continues to be degraded with TDS, sodium, chloride, and sulfate. Concentrations of TDS in downgradient monitoring well MW-3 continue to increase, indicating continued salinity loading from the discharge. Basin Plan, Beneficial Uses, and Regulatory Considerations 63. 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 Board. Pursuant to Water Code section 13263(x), waste discharge requirements must implement the Basin Plan. 64. The facility is located in the San Joaquin Valley Floor Hydraulic unit (535.10). Local drainage is to Lone Tree Creek, which is tributary to French Camp Slough and eventually to the San Joaquin River. The Basin Plan designates the San Joaquin River as supporting the beneficial uses of municipal and domestic supply; agricultural supply; industrial process supply; hydropower generation; water contact recreation; non-contact recreation; warm freshwater habitat; cold freshwater habitat; migration of aquatic organisms; spawning, reproduction, and/or early development; and wildlife habitat. 65. The Basin Plan designates the underlying groundwater as supporting the beneficial uses of municipal and domestic supply (MUN), agricultural supply (AGR), industrial process supply, and industrial service supply (collectively, IND). 66. For groundwater, the Basin Plan establishes narrative water quality objectives for, among other things, chemical constituents, tastes and odors, and toxicity. The Basin Plan also establishes a numeric objective for total coliform organisms. Quantifying a narrative water quality objective requires a site-specific evaluation of those constituents that have the potential to impact water quality and beneficial uses. 67. The Basin Plan sets a numeric water quality objective for bacteria requires that the most probable number (MPN) of coliform organisms over any seven-day period