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WASTE DISCHARGE REQUIREM'EIVTS ORDER NO. -4- RJM ENTERPRISES,BROWNS LAKE RANCH,AND RIVERCREST VINEYARDS,INC. SAN JOAQUIN COUNTY mg/l for TDS, and 76 to 226 mg/l for nitrate (as nitrate). There are no shallow groundwater monitoring wells at the site. 17. Based on percolation tests in boreholes, soil within the upper four feet of the subsurface at the site is generally composed of sandy-silts to silty-sands. The percolation rate was determined to be 28 cubic feet per square foot per day. Analysis for nitrate was performed on two shallow soil samples collected at the site, but not in the area of the unlined pond. Analytical results were reported to be non-detect and 10 milligrams per kilogram (mg/kg). 18. Local land use is mixed farming, primarily consisting of orchards. The Stanislaus River is approximately 1.3 miles south of the site. 19. The mean annual rainfall for the site is approximately 11.5 inches (San Joaquin County Department of Public Works, 1990). 20. The ground surface elevation at the facility is approximately 75 feet above mean sea level. Surface water drainage in the area of the site is to the Stanislaus River. The facility is within the Manteca Hydrologic Area (No. 531.10),.as depicted on interagency hydrologic maps prepared by the Department of Water Resources in August 1986. 21. 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 for all waters of the Basin. These requirements implement the Basin Plan. 22. The beneficial uses of the Stanislaus River are municipal and domestic supply, agricultural supply for irrigation and stock watering, industrial service,process and power supply, contact and non- contact recreation, warm and cold freshwater habitat, cold water migration, warm and cold water spawning, and for wildlife habitat. The beneficial uses of underlying groundwater are domestic, industrial, and agricultural supply. 23. Water quality criteria and other applicable standards associated with the protection of surface and/or groundwater beneficial uses are as follows: Compound Units Concentrations BODS mg/1 40'/80' TDS mg/1 4502 Nitrate mg/l 103/454 Sulfate mg/l 2505 ' Technological standards easily achieved with proper design and operation. 2 Agricultural Water Quality Goal 3 Primary MCL(as nitrogen). 4 Primary MCL(as nitrate). 5 Recommended upper level for Secondary MCL.