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WASTE DISCHARGE REQUIREMENTSORDER NO. R5-2003-0020 -3- FOR COUNTY OF SAN JOAQUIN FOR CONSTRUCTION, OPERATION, CLOSURE AND EVALUATION MONITORING FOOTHILL SANITARY LANDFILL, MUNICIPAL SANITARY LANDFILL SAN JOAQUIN COUNTY 15. The site characteristics where the Unit is located (see Finding No. 6) are not suitable for a new Class III landfill contained in §20260(a) and (b)(1) of Title 27 without the construction of additional waste containment features in accordance with §20260(b)(2) of Title 27 and State Water Resources Control Board Resolution No. 93-62. 16. 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. 17. Surface drainage is intermittent creeks, with storm waters draining generally in a westerly direction to enter the Delta via either Mormon Slough or Duck Creek, which flow into the San Joaquin River in the Lower Calaveras Hydrologic Area (531.30) of the San Joaquin Hydrologic Basin. 18. The landfill is located in northeastern San Joaquin County. The existing and potential designated beneficial uses of surface water, as specified in the Basin Plan, are municipal and domestic supply, agriculture (stock watering and irrigation), industrial (processing and service supply), water contact recreation (REC-1) and non -contact water recreation (REC-2), warm and cold freshwater habitat, warm and cold water migration of aquatic organisms, warm and cold water spawning, wildlife habitat, preservation of rare, threatened and endangered species, and groundwater recharge. 19. The first encountered groundwater is approximately 120 to 150 feet below the native ground surface. Groundwater elevations range from about 46 to 61 feet MSL. The groundwater is unconfined or partially confined. Groundwater elevations fluctuate seasonally less than one foot. 20. The direction of groundwater flow is toward the southwest. The average groundwater gradient is approximately 0.002 foot per foot. 21. Monitoring data indicates background groundwater quality has an electrical conductivity (EC) ranging between 153 and 710 micromhos/cm, with total dissolved solids (TDS) ranging between 151 and 250 mg/l. 22. All groundwaters in the San Joaquin River Basin are considered suitable or potentially suitable, at a minimum, for municipal and domestic water supply, agricultural supply, industrial service supply, and industrial process supply. 1 11AT MONITORING 1 23. The current groundwater monitoring system is comprised of an upgradient well (MW -1) and downgradient wells MW -2 and MW -3. Because of its current location in the Module 1 expansion footprint, MW -2 will be abandoned in accordance with standard practices.