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WASTE DISCHARGE REQUIREMENTS FOR -6- CITY OF STOCKTON AUSTIN ROAD LANDFILL CLASS III LANDFILL SAN JOAQUIN COUNTY 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 (1X 10 cm/s hydraulic conductivity or less) 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 antici- pated quantity of waste discharge and other waste management facility operations. CLOSURE SPECIFICATIONS 12. Closure of the landfill shall be under the direct supervision of a California registered civil engineer or certified engineering geologist. 13. Closed WMUs shall be provided with at least two permanent monuments, installed by a licensed land surveyor, from which the location and elevation of all wastes, containment structures, and monitoring facilities can be determined throughout the post-closure maintenance period. 14. At closure, the landfill unit shall receive a final cover which is designed and constructed to function with minimum maintenance and consists, at a minimum, of a two-foot thick foundation layer which may contain waste materials, overlain by a one-foot thick clay liner, and finally by a one-foot thick vegetative soil layer, or an engineered equivalent final cover approved by the Board pursuant to Subsections 2510(b) and (c) of Subchapter 15.