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t WASTE DISCHARGE REQUIREMENTS ORDER NO. 5-00-182 -5- R. LAWSON ENTERPRISES DBA WILDROSE VINEYARDS SAN JOAQUIN COUNTY 20. Three groundwater monitoring wells exist around the wastewater evaporation/percolation pond. In 1999, groundwater elevations in the wells varied from approximately 60 to 70 feet below ground surface. 21. Previous use of the wastewater pond by Dole Fruit, and present day use of the pond by CFP,may have impacted local groundwater quality. Groundwater quality at the wastewater pond is characterized by sample events performed from June 1993 to July 1999. Groundwater samples collected from Wells MW-2 and MW-3 are suspected of being impacted by prior wastewater discharge to the pond. Average concentrations in samples collected from the wells are presented below. Analyte Units MW-1 MW-2 MW-3 Sodium mg/l 35 106 120 Manganese mg/1 0.10 2.36 4.87 Iron mg/1 0.97 0.57 2.94 Sulfate mg/1 64 228 172 Chloride mg/1 37 177 254 pH pH Units 6.77 6.65 6.54 Elec. Conductivity umhos/cm 598 1,658 1,751 Inorganic TDS1 mg/1 338 1,087 1,004 t Inorganic Total Dissolved Solids 22. Domestic wastes at the winery are discharged to septic systems. One system is located at the winery, a second system is located at the office building, and the third system is located at the building that CFP occupies. The system at the winery disposes of effluent in two 25-feet deep seepage pits; the system at the office uses a 100-feet long leach line. Disposal of effluent from the third system is not documented. 23. Local land use consists of cropland(primarily vineyards), a school house, and private residences. 24. 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. 25. 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. 26. The beneficial uses of the Mokelumne River are municipal and domestic supply, agricultural supply for irrigation and stock watering, contact, canoeing, and non-contact recreation, warm and cold freshwater habitat, warm and cold water migration,warm and cold water spawning, and for wildlife habitat.