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WASTE DISCHARGE REQUIREMENTS FOR -6- CITY OF STOCKTON AUSTIN ROAD LANDFILL FACILITY CLASS III LANDFILL SAN JOAQUIN COUNTY 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 landfills 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 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. 15. Sludge which is incorporated into the foundation layer shall be tested to determine if it has appropriate engineering properties to support the overlying clay liner, soil cover and other potential loads. 16. Vegetation shall be planted and maintained over each closed landfill unit. Vegetation shall be selected to require a minimum of irrigation and maintenance and shall have a rooting depth not in excess of the vegetative layer thickness. 17. Closed landfill units shall be graded to at least a three-percent (3%) grade and maintained to prevent ponding. 18. Areas with slopes greater than ten percent, surface drainage courses, and areas subject to erosion by wind or water shall be designed and constructed to prevent such erosion. C. Provisions: 1. The Discharger shall , in a timely manner, remove and relocate any wastes discharged at this facility in violation of this Order. 2. The Discharger shall maintain a copy of this Order at the facility and make it available at all times to facility operating persolinel , who shall be familiar with its contents, and to regulatory agency personnel . 3. The Discharger shall notify the Board in writing of any proposed change in ownership or responsibility for construction or operation of the WMUs. The Discharger shall also notify the Board of a material change in the character, location, or volume of the waste discharge and of any proposed expansions or closure plans. This notification shall be given 180 days prior to the effective date of the change and shall be accompanied by an amended Report of