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The top of each lift shall be graded and sloped for adequate drainage to prevent ponding of precipitation on the cover. Cover material shall be compacted in layers not to exceed 6 inches of compacted thickness. This material shall be compacted to meet all applicable Federal and State laws and regulations governing solid waste management. Additional factors to be considered for proper waste disposal procedures shall include the following: The Contractor shall manage his operation to minimize the use of cover material and prevent waste of cover material. While the Contractor will be required to apply the specified thickness of cover material, care shall be taken to prevent the use of excessive cover material which would unnecessarily deplete the available air space. The Agreement shall be based on obtaining all cover material from outside purchase of operations borrow. The Contractor may purchase onsite or adjacent site borrow from the County, if the County wishes to sell borrow material. The County, at its discretion, will conduct surveys and analyses to determine the volume of the solid waste fill, the rate of filling and degree of compaction, the quantity of cover material used, the approximate ratio of cover to solid waste for the landfill, the approximate quantity of cover material required to complete the landfill, and the approximate remaining quantity of cover material available on the site or adjacent sites. If the County determines that excessive landfill capacity or cover material is being utilized, the County shall have the right to require the Contractor to modify his operation to achieve the specified cover with less cover material, and to increase his compaction efforts. c. Final Closure - Final closure of the Class I Landfill will be done in phases using an impermeable barrier layer (geomembrane). The future closure of Class I areas will be classified as a new project and may be performed by Contractor under a contract amendment or competitively bid at the discretion of the County. 1.3.5 Diversion of Runoff from Working Face The landfill shall be operated to minimize drainage of surface water across exposed solid waste on the active working face. At all times when runoff from an area larger than one-half acre could flow across the active working face, a temporary diversion berm shall be installed on the top of the lift upgradient from the working face to divert surface runoff around the working face. The drainage area between the diversion berm and the working face shall not exceed one-half acre. The diverted water shall be spread as thinly as possible to minimize erosion of landfill cover. Any erosion of cover shall be promptly repaired. Sections of temporary diversion berms that are no longer needed to protect the working face shall be promptly removed and the area occupied by the berm regraded to promote uniform runoff of surface water and to minimize erosion. The Contractor shall develop and submit a plan to minimize leachate generation. This plan will be incorporated as part of the Contractors methods of operation plan. Minimizing leachate generation is an important part of Class I operations and the Contractor shall make every effort to 1.3-3