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'~~ ~~ <br />82298/5 <br />western and northeastern extensions of the tailings embank- <br />ment be constructed using the same methods which were employed <br />for the existing embankment. This would include construction <br />of adequate starter dams using mine waste rock and talus which <br />are adequately compacted, installation of underdrain and decant <br />tower systems utilizing perforated pipe for the underdrain <br />system, and proF~er removal of all topsoil, organic materials, <br />and debris from the bedrock surface prior to dam and pond <br />construction. 7'he tailings embankment sands for the proposed <br />extensions should be placed at a 70 percent relative density <br />through the employment of mechanical compaction methods. The <br />seep water berms which are planned for construction beyond the <br />toe of the embankment should be constructed if seepage begins <br />to occur at the toe. We also recommend that stand pipe piezo- <br />meters be located at various intervals along the crest and toe <br />of the new and existing embankments to monitor any phreatic or <br />ground water level changes. The small embankment which may be <br />constructed on the upslope side of the proposed northeast <br />extension of the tailings pond should be constructed in the <br />same manner as that of the downslope embankment of the existing <br />pond. <br />