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elevation. This final waste surface was used by the County to <br /> design the final cover grades. <br /> FOUNDATION LAYER <br /> The foundation layer is the first layer of the final landfill <br /> cover. It consists of on-site soils compacted to 90% relative <br /> maximum dry density. Compaction was achieved using a Caterpillar <br /> model 825C sheepsfoot compactor. Kleinfelder performed all <br /> moisture-density testing for the foundation layer. Please refer to <br /> the Kleinfelder Final CQA Report included as Appendix A for <br /> foundation layer moisture-density test data. The foundation layer <br /> is a minimum of two feet thick. However, it is actually thicker in <br /> qW <br /> most areas in order to achieve a minimum slope design, and account <br /> for an uneven waste surface. The foundation layer sets the slope <br /> grades for the clay barrier layer and vegetative layer. Grades for <br /> the foundation layer were verified by the County's survey crew <br /> (Drawings 3 and 4) . <br /> CLAY BARRIER LAYER <br /> The clay barrier layer is the second layer of the final cover, and <br /> directly overlies the foundation layer. The clay barrier layer <br /> consists of select on-site soils mixed with Ione clay. The clay <br /> 9 <br />