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WASTE DISCHARGE REQUIKEMENTS -5- CITY OF STOCKTON AUSTIN ROAD LANDFILL CLASS III LANDFILLS SAN JOAQUIN COUNTY Water Quality Protection Standards 6. The concentrations of indicator parameters or waste constituents in waters passing through the Points of Compliance shall not exceed the "water quality protection standards" established pursuant to and enumerated in Monitoring and Reporting Program No. 89-031, which is attached to and made part of this Order. Protection from Storm Eventt 7. WMUs shall be designed, constructed, and operated to prevent inunda- tion or washout due to floods with a 100-year return period. Class II surface impoundments and related containment structures shall be constructed and maintained to prevent, to the greatest extent possible, inundation, erosion, slope failure, washout, and overtopping under 1000-year, 24-hour precipitation conditions, and shall be designed to contain the 100-year wet season precipitation without using the required two feet of freeboard. The Class III landfill unit and its 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. D. Precipitation and drainage control systems for the landfill and surface impoundment shall be designed and constructed to accommodate the anticipated volume of precipitation and peak flows from surface runoff under 1000-year, 24-hour precipitation conditions, as described in Finding No. 22 above. 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 but no later than 15 October of each year, 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. 11. During the rainy season a minimum one-foot thickness of low permeability cover shall be maintained over all but the active disposal' -1 area of the dndf i I I unit. The active disposal area shall be confined to the smallest area practicable based on the anticipated quantity of waste discharge and other waste management facility operations.