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L <br />constructed and maintained at a minimum 2 percent slope to divert sur- <br />face drainage away from covered wastes. <br />Maximum final landfill slopes will be constructed no steeper than <br />12 percent along the perimeter slopes to minimize erosion while pre- <br />venting drainage slope reversal from landfill settlement. A minimum <br />4.5 -foot -thick final cover will be placed over the refuse, fill to <br />minimize precipitation infiltration and provide a suitable rooting <br />zone for vegetation. The vegetation should minimize erosion, enhance <br />evapotranspiration, and blend the completed landfill with existing <br />terrain. The final soil cover will be placed and vegetated as land- <br />fill modules are brought to final grade. <br />The landfill grading plan also features an undulating configuration to <br />eliminate an extensive surface drainage system without sacrificing <br />drainage control during construction and after completion of the land- <br />fill. Drainage control will be handled by collecting sheet flow <br />runoff in the landfill drainage swales and passing it to the perimeter <br />ditches. Runoff will travel along the perimeter ditches to be dis- <br />charged to the natural drainage channels that exit the site along the <br />west and south perimeters. <br />Screening berms and soil stockpiles are shown in the grading plan. <br />These screening berms will be constructed along the high-voltage <br />transmission lines to shield landfill operations from Harney Lane. In <br />addition, the land northeast of the screening berms will have "park- <br />like" landscaping to visually enhance the site. <br />The excavation and fill sequence plan is illustrated on Drawing 2. <br />The plan shows the approximate limits and proposed base grades of the <br />excavation, the module development, and the sequence of excavation and <br />fill. <br />PJ9 9390209A.00D 11 <br />