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<br /> i <br />di <br />Th <br />d <br />b <br />k <br />ill <br />l <br />d f <br /> con <br />t <br />ons. <br />e pon <br />em <br />an <br />ment w <br />on <br />y stan <br />or the <br /> operating life of the facility. Following leaching and <br /> detoxification, the ponds will be backfilled and graded to a <br /> gentler slope making them even more stable. <br /> <br /> D. 7.6.2 Material Properties <br /> Th <br />t <br />l <br />i <br />h <br />l <br />d <br /> e ma <br />eria <br />propert <br />in t <br />e stabi <br />ity evaluation <br />es use <br /> were based on laboratory test results, field data and empirical <br /> correlations with material type obtained from engineering <br /> literature. <br /> <br /> D.7.6.3 Results and Conclusions <br />t <br /> The results of the stability analyses indicate that the <br /> ponds will be stable under the conditions evaluated. A summary <br /> of the FOS calculated are presented on Figure D.1.6-1. <br />' The minimum static FOS is 1.5 far Section 4 and 1.7 for <br />Section B. The minimum pseudostatic FOS is 1.1 for Section A <br />and 1.3 for Section B. These values compare favorably with the <br />minimum values of 1.5 and 1.0 recommended by the U.S. Army <br />1 Corps (1970) for long-term static and pseudostai.ic analyses, <br />respectively. <br />' D.8 Pro.iect Water Balance <br />The overall water balance for the project was analyzed to <br />simulate the monthly storages and demands at the tailings disposal <br />and heap leach facilities in order to size the solution storage <br />facilities and to determine the anticipated freshwater makeup <br />' requirement. A computer spreadsheet was set up to *.abulate the <br />monthly water inflows, losses, and storages at each facility. <br />Appendix G contains the water balance spread sheet. The results <br />incorporate the effects of the separate components of earth facility. <br /> <br />D-57 (Revised 4/20/89) <br />