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WASTE DISCHARGE REQUIREMENTS ORDER NO.R5-2002-0219 -4- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION AND OPERATION OF NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL FACILITY, SAN JOAQUIN COUNTY Slopes 5:1 and less: a total 3 feet of compacted soil. Slopes steeper than 5:1: a total 2 feet of compacted soil. Soil thickness shall be after compaction to 85%relative density. WASTE AND SITE CLASSIFICATION 16. The Discharger discharges non-hazardous municipal solid waste and inert waste, as defined in §20164 of Title 27. Nonhazardous solid wastes include municipal solid wastes, as referred to in the Code of Federal Regulations, Title 40,Part 258.2. 17. The site characteristics where the Unit is located do not meet the siting criteria for a new Class III landfill contained in §20260(a) and (b)(1) of Title 27, and requires the construction of waste containment features in accordance with §20260(b)(2) of Title 27 and State Water Resources Control Board Resolution No. 93-62. SURFACE AND GROUND WATER CONDITIONS 18. The Water Quality Control Plan (Basin Plan) for the Sacramento River and San Joaquin River Basins, Fourth Edition, 1998, designates beneficial uses, establishes water quality objectives, and contains implementation plans and policies for all waters of the Basin. 19. Approximate average ground surface elevation is 115 feet,MSL. Surface drainage is toward South Paddy Creek,which crosses the site and is an intermittent tributary to Bear Creek and Disappointment Slough, which flow into the San Joaquin River in the Lower Mokelumne Hydrologic Area(531.20) of the San Joaquin Hydrologic Basin. 20. Surface water from the landfill is directed to the seasonal wetlands on site. If these wetlands become overfull, surface water flows into a tributary of the South Paddy Creek, which flows into the San Joaquin River. The designated beneficial uses of these surface waters, as specified in the Basin Plan, are municipal and domestic supply, agricultural supply(stock watering and irrigation),water contact recreation(REC-1) and non-contact water recreation(REC-2),warm and cold freshwater habitat,warm water migration of aquatic organisms,warm and cold water spawning,wildlife habitat,preservation of rare, threatened and endangered species, and groundwater recharge. 21. The first encountered groundwater is about 145 to 157 feet below the native ground surface(Groundwater elevations range from—30.0 feet mean sea level(MSL)to—42.0 feet MSL). The groundwater is unconfined. Groundwater elevations fluctuate seasonally as much as six feet.