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WASTE DISCHARGE SQUIREMENTS 7 FOR THE CLOSURE AND POST CLOSURE OF HARNEY LANE CLASS III LANDFILL SAN JOAQUIN COUNTY Landfill Specifications 4. During the rainy season, when precipitation can be expected, a minimum one-foot thickness of low permeability cover shall be maintained over the landfill unit. 5. Methane and other landfill gases shall be adequately vented, removed from the landfill units, 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. Protection from Storm Events 6. Precipitation and drainage control systems shall be designed, constructed, and operated to prevent inundation or washout due to floods with 100-year return period. Landfill 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. 7. Surface drainage from tributary areas and internal site drainage from surface or subsurface sources shall not contact or percolate through wastes. 8. Annually, prior to the anticipated rainy season but no later than 1 November, any necessary erosion control measures shall be implemented, 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. D. RECEIVING WATER LIMITATIONS Water Quality Protection Standards The concentrations of Constituents of Concern in waters passing through the Points of Compliance shall not exceed the Concentration Limits established pursuant to Monitoring and Reporting Program No. which is attached to and made part of this Order.