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barrier layer has a minimum thickness of one foot. <br /> The clay barrier layer portion of the final cover construction is <br /> certified by Kleinf elder, Inc. in their Final CQA Report referenced <br /> 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% Ione clay mixed with 80% <br /> select on-site soils. The clay barrier layer was constructed by <br /> first placing a 1311 to 1411 loose lift of select on-site soils over <br /> the foundation layer. Bottom-dump haul trucks then placed Ione <br /> clay over the 13t0 to 1411 native soil layer. A Caterpillar <br /> motorgrader model 14G was then used to spread the Ione clay to a <br /> uniform thickness of approximately 311 to 411 over the 1311 to 1411 <br /> native soil layer. <br /> The depth of the respective native soil and Ione clay layers was <br /> verified by random digging performed by Kleinfelder. The third <br /> step was to break up the Ione clay clods by using a CMI model RS500 <br /> motorized pug mill making one pass over the clay at a depth of 5- <br /> 1/211 . The fourth step was comprised of making one pass with the <br /> RS500 set to a depth of 1611to 1811 , in which the clay and native <br /> soils were mixed dry. The fifth step was to make a final pass with <br /> the RS500 at a depth of 1811 over the mixed material while adding <br /> water. A water truck was connected to the RS500 by a large hose <br /> for moisture conditioning. Moisture conditioning was controlled by <br /> 10 <br />