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will be placed over the refuse fill to minimize infiltration into the landfill and pro- vide a suitable rooting zone for vegetation. The final soil cover will be placed and vegetated as landfill modules are brought to final grade. The vegetation will minimize erosion, enhance evapotranspiration, and blend the completed landfill with existing terrain. The landfill grading plan features an undulating configuration to eliminate an ex- tensive surface drainage system without sacrificing drainage control during con- struction and after completion of the landfill. 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 and will 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. Ol 5.1.2 Excavation and Fill Sequence Plan The excavation and fill sequence plan is shown on Drawing 2. The plan shows approximate limits and proposed excavation base grades, module development, and the sequence of excavation and fill. The site will be divided into modules to facilitate efficient excavation, soil han- dling, access, drainage, and controlled placement of wastes. Landfill operations will proceed in numerical order by module. Excavation will proceed one module ahead of refuse fill. Soils in any module suitable for final cover will be excavated and placed as such or stockpiled for use in later modules. The existing irrigation well (Well No. 1) located in Module 9 will be preserved as far into the life of the site as possible to provide water needed for dust control and fire protection. Well No. 2 will be used after the abandonment of Well No. 1. PJ9 9390218A.00W 37 Rev. 0 July 20, 1989