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WASTE DISCHARGE REQUIREMENTS WASTE MANAGEMENT OF NORTH AMERICA INCORPORATED FOOTHILL SANITARY. LANDFILL INCORPORATED FOOTHILL SANITARY LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY SIB 6. Prior to the discharge of wastes to a WMU, all wells within 500 feet of the unit shall have sanitary seals which meet the requirements of the San Joaquin County Local Health District or shall be properly abandoned. A record of the sealing and/or abandonment of such wells shall be sent to the Board and to the State Department of Water Resources. 7. Waste management units shall be designed, constructed, and operated to prevent inundation or washout due to floods with a 100-year.return period. Class III landfill units and related containment structures shall be constructed and maintained to prevent, to the greatest extent possible, ponding, infiltration, inundation, erosion, slope failure, washout, and overtopping under 100 -year, 24-hour precipitation conditions. 8. Precipitation and drainage control systems shall be designed and constructed to accommodate the anticipated volume .of precipitation and peak flows from surface runoff under 100 -year, 24-hour precipitatior conditions. 9. Surface drainage from tributary areas and internal site drainage from surface or subsurface sources .shall not contact -or percolate through wastes. 10. Annually, prior to the anticipated rainy season, any necessary erosion control measures shall be impleme6ted, and any necessary construction, maintenance, or repairs of precipitation and drainage control facilities shall be completed to prevent erosion or flooding.of the facility and to prevent surface drainage from contacting or percolating through wastes. 11:. A one -foot thickness of compacted soil will be maintained over all disposal areas not to be used for greater than 180 days, to minimize. percolation through waste. The active disposal area shall be confined to the smallest area practicable, based on the anticipated quantity of waste discharge and other wastemanagement facility operations. 12. Methane and other landfill gases shall be adequately vented, removed from the unit, or otherwise controlled to prevent the, danger of explosion, adverse health effects, -nuisance conditions, or the impairment of beneficial uses of water due to migration through the vadose (unsaturated) zone.