SITE INFORMATION AND CORRESPONDENCE

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WASTE DISCHARGE REQUIREI JTS ORDER NO. 5-01-172 EAST-SIDE WINERY DBA OAK IWE VINEYARDS 5 SAN JOAQUIN COUNTY surface. Depth to groundwater measurements taken at shallow monitoring wells located at the wastewater ponds found groundwater from approximately 11 to 35 feet below ground surface. 25. Three groundwater monitoring wells were recently installed at the site. Based on two groundwater sample events, groundwater appears to be impacted by total dissolved solids and conductivity. The groundwater quality is characterized below: Anal e Units MW-1 MW-2 MW-3 VOCs µg/l ND ND I'mI pH Std. Unit 6.64 6.34 6.64 Conductivity µmho/cm 508.5 1,132 121.5 Total Dissolved Solids mg/l 259 767 88 NO3 as Nitrogen mg/l ND ND ND NDS indicates all analytes in EPA Method 8010b not detected. 26. Groundwater flow direction is to the south. None of the wells are located downgradient of the wastewater ponds, however, Well MW-3 is considered upgradient of the source areas. This Order requires additional groundwater monitoring wells to be installed. 27. Local land use consists of vineyards, wineries, and warehouses. 28. The Mokelumne River is approximately 2,500 feet north of the winery facility; the wastewater ponds are located adjacent to the river and are within the 100 year flood zone. 29. The mean annual rainfall for the site is approximately 11.5 inches (San Joaquin County Department of Public Works, 1990). 30. 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. 31. The Board adopted a Water Quality Control Plan, Fourth Edition, for the Sacramento/San Joaquin River Basins (hereafter Basin Plan), which contains water quality objectives and beneficial uses for all waters of the Basin. These requirements implement the Basin Plan. 32. 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. 33. The beneficial uses of underlying groundwater are municipal and domestic water supply, agricultural supply, industrial service supply, and industrial process supply. 34. Water quality criteria and other applicable standards associated with the protection of surface and/or groundwater beneficial uses are as follows: