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as Appendix A to this Final Documentation Report. <br /> The portion of the clay barrier layer overlying the top surface of <br /> the landfill consists of a minimum of 20% red clay mixed with 80% <br /> select soil. The clay barrier layer was constructed by first <br /> placing a 1211 to 1301 loose lift of select soil with bottom-dump <br /> haul trucks over the foundation layer. Bottom-dump haul trucks <br /> then placed red clay over the 1211 to 1311 select soil layer. A <br /> Caterpillar motor grader model 14G was then used to spread the red <br /> clay to a uniform thickness of approximately 401 over the 1211 to 1311 <br /> select soil layer. <br /> The depths of the respective select soil and red clay layers were <br /> verified by random digging performed by Kleinfelder. The third <br /> step was to uniformly dry mix the two layers by using a RAGO or <br /> Caterpillar SM350 motorized pug mill making one pass over the <br /> materials at a depth of 1611 to 18" . The fourth step was comprised <br /> of making two passes with the mixer set to a full depth of 18" <br /> while adding water to the mixed soil by use of a spray bar attached <br /> to the mixer. A water truck was connected to the mixer by a large <br /> hose for moisture conditioning. Moisture conditioning was <br /> controlled by the mixer. The depth was increased to eighteen <br /> inches to scarify the top surface of the foundation layer to <br /> promote better layer bonding. The sixth and final step was to <br /> compact the layer with a Caterpillar model 825C sheepsfoot <br /> compactor. The top surface portion of the clay was compacted to a <br /> 10 <br />