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WASTE DISCHARGE REQUIREMENTS FOR -5- CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 4. Water used for facility maintenance shall be limited to the minimum amount necessary for dust control and construction of the final cap. Supervision and Certification of Construction 5. All containment structures shall be designed and constructed under the direct supervision of a California registered civil engineer or a certified engineering geologist and shall be certified by that individual as meeting the prescriptive standards and performance goals of Subchapter 15 prior to waste discharge. 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 Monitoring and Reporting Program No. 90-122, which is attached to and made part of this Order. Protection from Storm Events 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 landfills 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 precipitation 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 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 area of the landfill 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.