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observations at similar landfill operations in San Joaquin <br /> County. This factor assumes that intermediate cover in excess <br /> of the 6 inches required for daily cover will be stripped and <br /> reused when these areas are covered with subsequent <br /> landfilling. <br /> d) Stockpiling of soil: <br /> During dry weather conditions, soil for daily cover at the <br /> site will be brought directly from the active borrow area to <br /> cover landfilled waste. This eliminates double handling <br /> associated with stockpiling. When possible, the borrow area <br /> during winter months will be kept close to the active face so <br /> that daily cover can be excavated and placed in one operation <br /> as in dry weather months. <br /> However, there will be times during wet weather operations <br /> when the borrow area is not accessible to landfill equipment. <br /> In this situation, soil for daily cover activities will have <br /> to be stockpiled near the winter work areas. These soils will <br /> be stockpiled prior to the wet weather and used for borrow <br /> during winter months. <br /> e) Permeability of cover soil: <br /> The soils used for daily or intermediate cover have <br /> permeabilities which 'vary. Any of the on-site soils are <br /> suitable for this purpose. As mentioned above, the final <br /> cover will consist of foundation, clay and vegetative layers. <br /> The permeability of the foundation layer, like the - <br /> intermediate or daily cover soil, may vary. This layer must <br /> support the compactive effort of clay layer compaction and <br /> therefore will consist of soils which compact well. It is <br /> anticipated that a minimum relative density of 90% will be <br /> targeted for the foundation layer to enable the same <br /> compaction rate for the clay layer above. <br /> f) Placement of final cover: <br /> After portions of the landfill are brought to final <br /> grade,placement of the final cover will take place. The final <br /> cover will vary depending on where it is applied. For example <br /> final cover for the existing landfill will consist of a 24 <br /> inch foundation layer, a 12 inch 'low permeability or "clay" <br /> layer and a 12 inch vegetative layer. Final cover over lined <br /> modules will be equal to the bottom liner in accordance with <br /> Subtitle D. Since the County may install engineered <br /> alternatives, final cover cannot be completely defined at this <br /> time. <br /> Compaction of the foundation and clay layers will be performed <br /> by a sheepsfoot roller with the soil at or slightly above <br /> 27 <br />