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Once in place, the clay barrier layer material was compacted with <br /> the same Caterpillar model D-9N dozer. <br /> The side slope portion of the clay barrier layer was compacted to <br /> a minimum of 90% relative maximum dry density, and a moisture <br /> content approximately 2% over optimum. All testing concerning the <br /> clay barrier layer was performed by a qualified technician of <br /> Kleinfelder. For additional information regarding the clay barrier <br /> layer CQA, please refer to the Kleinfelder report included as <br /> Appendix A. <br /> VEGETATIVE LAYER <br /> The vegetative layer is the third and final layer making up the <br /> landfill's final cover. The vegetative layer consists of soil from <br /> Granite's pit compacted to approximately 85% of relative maximum <br /> dry density. The vegetative layer has a minimum thickness of one <br /> foot. The vegetative layer on top and side slope areas was placed <br /> by bottom-dump haul trucks and compacted by truck traffic and <br /> Caterpillar motor graders. Compaction for the top portion of the <br /> vegetative layer was also achieved by driving over the surface with <br /> bottom dump haul trucks and Caterpillar 14G motor graders. Grades <br /> for the vegetative layer were verified by the County's survey crew <br /> (Drawing 3) . <br /> The final step in constructing the final cover was to vegetate the <br /> 12 <br />