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WASTE DISCHARGE REQUIREMENTS ORDER R5-2012-0103 - 20 - CONSTELLATION BRANDS U.S. OPERATIONS, INC. dba WOODBRIDGE WINERY WOODBRIDGE WINERY SAN JOAQUIN COUNTY 57. Surface water drainage is to the Mokelumne River. The facility is within the Lower Mokelumne Hydrologic Area (No. 531.20), as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 58. The beneficial uses of the Mokelumne River from Camanche Reservoir to the Sacramento/San Joaquin Delta are agricultural supply; water contact recreation; non- contact water recreation; warm freshwater habitat; cold freshwater habitat; migration of aquatic organisms; spawning, reproduction, and/or early development; and wildlife habitat. 59. The beneficial uses of underlying groundwater are municipal and domestic water supply, agricultural supply, industrial service supply, and industrial process supply. ANTIDEGRADATION ANALYSIS 60. State Water Resources Control Board (State Board) Resolution 68-16 (the Antidegradation Policy) requires that the Central Valley Water Board, in regulating the discharge of waste, must maintain the high quality of 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 Regional Water Board’s policies (e.g., quality that exceeds water quality objectives). Resolution 68-16 also requires that waste discharged to high quality waters be required to meet WDRs that will result in the best practicable treatment or control of the discharge. Resolution 68-16 prohibits degradation of groundwater quality as it existed in 1968, or at any time thereafter that groundwater quality was better than in 1968, other than degradation that was previously authorized. 61. Groundwater conditions at the site in 1968 are unknown. Therefore, background groundwater quality is an appropriate basis for the Antidegradation analysis. As noted in the foregoing Findings, the Mokelumne River is a source of high quality groundwater recharge upgradient of the site, and shallow groundwater quality declines with increasing distance from the river. Locally, the shallow groundwater degradation may be caused by natural mineralization and/or agricultural activities. However, shallow groundwater beneath the site has apparently been degraded with TDS, sulfate, chloride, sodium, and nitrogen compounds by the long-time winery discharge, which began as early as 1933. 62. As described above, the Discharger has lined the Upper Ponds, implemented salinity source control, improved wastewater treatment, implemented water conservation measures and improved cropping practices to maximize nutrient and water uptake. However, the level of salinity reduction achieved with source control to date is not known. Therefore, it is appropriate for this Order to require that the Discharger provide a quantitative determination of the level of salinity reduction achieved for each of the contributing waste streams. 63. According to the RWD, the facility generates an economic benefit on the local, state, and national economies. The estimated overall total benefit is approximately $218.1 million per year. Based on the following, allowing some level of groundwater degradation of groundwater is in the best interest of the people of the State: