ARCHIVED REPORTS_1988 - Laserfiche WebLink

Home Browse Search

constructed and maintained at a minimum 2 percent slope to divert sur- face drainage away from covered wastes. Maximum final landfill slopes will be constructed no steeper than 12 percent along the perimeter slopes to minimize erosion while pre- venting drainage slope reversal from landfill settlement. A minimum ' 4.5-foot-thick final cover will be placed over the refuse fill to minimize precipitation infiltration and provide a suitable rooting ' zone for vegetation. The vegetation should minimize erosion, enhance evapotranspiration, and blend the completed landfill with existing terrain. The final soil cover will be placed and vegetated as land- fill modules are brought to final grade. ' The landfill grading plan also features an undulating configuration to eliminate an extensive surface drainage system without sacrificing ' drainage control during construction and after completion of the land- fill . Drainage control will be handled by collecting sheet flow runoff in the landfill drainage swales and passing it to the perimeter ditches. Runoff will travel along the perimeter ditches to be dis- charged to the natural drainage channels that exit the site along the west and south perimeters. ' Screening berms and soil stockpiles are shown in the grading plan. These screening berms will be constructed along the high-voltage transmission lines to shield landfill operations from Harney Lane. In addition, the land northeast of the screening berms will have "park- like" landscaping to visually enhance the site. 4. 1 .2 Excavation and Fill Sequence Plan The excavation and fill sequence plan is illustrated on Drawing 2. ' The plan shows the approximate limits and proposed base grades of the excavation, the module development, and the sequence of excavation and ' fill . ' PJ9 9390209A.00D 11 ' Efi1COf1 Associates