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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0034 5 SUTTER HOME WINERY LODI FACILITY, SAN JOAQUIN COUNTY 53 mg/L, 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.applicatioTy 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. SITE SPECIFIC CONDITIONS 31. Local land use consists of vineyards and agricultural operations including confined animal facilities. The topography of the surrounding area is level. The prevailing wind direction is from the northwest to the southeast. Groundwater quality may be impacted from the previous land use activities. 11 32. The wastewater ponds are located outside the 100 year flood zone, however the Iand application area is partially located within the 100 year flood zone. 33. Surf cial soils are described as consisting of sandy silt to a depth of approximately 9 feet below ground surface fogs) 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. h 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 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. These requirements implement the Basin Plan. 37. The beneficial uses of the Mokelumne River are agricultural irrigation and agricultural stock watering, contact recreation, canoeing and rafting recreation, other non-contact recreation, warm freshwater habitat, cold freshwater habitat, warm water migration, cold water migration,warm water spawning, 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.