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WASTE DISCHARGE REQUIRE16,LiVTS ORDER NO. r•' SUTTER HOME WINERY 5 LODI FACILITY SAN JOA UIN COUNTY Q UN Y 88 mg/L, 140 mg/L, and 170 mg/L. The source of the elevated nitrate concentrations may be related to previous land use. 29. Inferred groundwater.flow direction is to the west. Shallow groundwater has been encountered at the site during construction activities. No groundwater data has been collected from areas located downgradient of the wastewater treatment pond or the land application area. This Order requires ! groundwater monitoring wells to be monitored. 30. A Groundwater Monitoring Well Installation Workplan was submitted with the 15 November 2001 RWD. A conditional approval of the workplan was transmitted on 11 December 2001. i SITE SPECIFIC CONDITIONS 31. Local land use consists of vineyards and agricultural operations. The topography of the surrounding area is level. The prevailing wind direction is from the northwest to the southeast. Previous land use in the surrounding area includes a livestock enclosure. Groundwater quality may be impacted from the previous land use activities. 32. The wastewater ponds are Iocated outside the 100 year flood zone, however the land application area is partially located within the 100 year flood zone. 33. Surficial soils are described as consisting of sandy silt to a depth of approximately 9 feet below ground surface (bgs) and silty sand to an investigated depth of 15 feet bgs. 34. The mean annual rainfall is 17.2 inches, while the 100-year return annual total is 32.7 inches. 35. Surface water drainage in the area of the site 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. ' BASIN PLAN, BENEFICIAL USES, AND REGULATORY CONSIDERATIONS 36. The Water Quality Control Plan for the Sacramento River and San Joaquin River Basins, Fourth Editionhereafter 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. These requirements implement the Basin Plan. 37. The beneficial uses of the Mokelumne River are agricultural supply for irrigation and stock watering, contact recreation, canoeing, and other non-contact recreation, warm and cold freshwater habitat, warm and cold water migration, warm and cold water spawning, and wildlife ' habitat. 38. The beneficial uses of underlying groundwater are municipal and domestic water supply, agricultural supply, industrial service supply, and industrial process supply. C:I micct FiWSites\Sutter ffa elSutte Hum WDRA.doc