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Joseph A Cesare and Associates, Inc. t Construction Technical Services <br />plasticity of the bedrock and a standard Proctor test (ASTM D698) to determine the <br />moisture/density relationship of compacted bedrock material. These results are presented in <br />Figures 3 and 4. The sample was then remolded to approximately 95 percent of maximum dry <br />density at optimum moisture content as determined by ASTM D698 and tested for its <br />permeability using the flexible wall permeability test. The results of the permeability test are <br />shown in Appendix A. <br />The testing indicates the shale consists of a sandy lean clay with the following <br />properties: <br />Percent Fines Liquid Limit Plasticity Index Permeability <br />64.3% 42 21 2.410" cm/s <br />The gradation analysis indicated 3 percent gravel in the bedrock sample. This gravel <br />likely represents contamination from the overburden so the actual fine content is likely higher <br />than represented in the testing. The Proctor and permeability tests were conducted by scalping <br />all material retained on the #4 sieve (gravel fraction). Some contamination of the bedrock may <br />occur during the mining process, and therefore the test results are likely representative of the <br />proposed liner material. <br />It is our opinion that the bedrock material is suitable to be used as a liner for the <br />proposed pit. When properly placed and compacted, the seepage through the liner should meet <br />State of Colorado regulations. <br />If you have any questions or comments in regards to this information, please feel free to <br />contact our office. <br />Sincerely, <br />JOSEP AND ASSOCIATES, INCJ <br />CON ,:ft1 HNICAL SERVICES <br />33919 <br />Da :Dur n, .F-i <br />J. W <br />Prin S;; <br />'Y <br />SION AL <br />DRD/ksm <br />Attachments <br />Project No. D08.138 <br />81381tr.0829.08 <br />2 <br />12