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• 5.0 - GEOTECHNICAL AND PILE STABILITY <br />Geotechnical investigations and testing were conducted, <br />between 1976 and 1982, by various engineering firms for the <br />areas within and adj-scent to the refuse disposal facilities. <br />A detailed discussion of subsurface materials and their pro- <br />perties are presented in the October 1984 application sub- <br />mitted by West Elk Coal Company. Several gradation and <br />strength test results performed on refuse materials by Ana- <br />conda Minerals Company have also been reported in that appli- <br />cation. <br />A detailed and extensive slope stability analysis using the <br />• above test results was performed and the results have also <br />been presented in the application submitted in October 1984. <br />5.1 Additional Testing on Refuse Materials <br />Two samples of refuse (preparation plant waste) were obtained <br />in February 1985. Gradation analysis, compaction and con- <br />solidated undrained triaxial tests with pore pressure <br />measurements were performed on these samples and the results <br />are shown in Appendix B. The following effective strength <br />parameters were obtained for the samples tested: <br />• <br />18 <br />