Laserfiche WebLink
Monitoring <br /> Piezometers will be installed on every two lifts during construction of the WRL. These <br /> piezometers will extend to the base of WRL. They will allow for monitoring of both water levels <br /> within the WRL, to ensure that it is freely draining, and settling or slope movement over time. <br /> The piezometers will be GPS located and measured annually. <br /> Conclusion <br /> The GALENA models show multiple iterations of the analysis (Appendix GS). This is standard <br /> procedure for the Bishop's Method of Slices. For the mining"highwall"/slope, the lowest overall <br /> slope factors of safety can be seen in Analysis 3 and Analysis 5 (Analysis 6 shows seismic <br /> conditions). Analysis 4 shows the factor of safety on a single bench, which is to be expected <br /> given the near vertical material face. Single bench slope failures will be contained within the <br /> overall slope. <br /> For the WRL, the lowest overall slope factors of safety are shown in Analysis 1 and 3 (Analysis <br /> 4 shows seismic conditions). Analysis 2 shows single bench lowest factor of safety, similar to the <br /> mining highwall. <br /> All permanent case factors of safety are greater than 1.5 (1.1 for seismic)which is the CDRMS <br /> minimum for this type of design. <br /> GALENA data tables and analysis results are attached as Appendix GS-1. The safety factors of <br /> each model can be found in Table GS-1. <br /> Table GS-1. Factors of Safety for Slope Stability <br /> Lowest Factor of Safety Condition <br /> 1.93 Mining condition of the highwall (immediate highwall) <br /> 1.94 Reclaimed condition of the highwall <br /> 1.72 Reclaimed condition of the highwall under seismic conditions <br /> 1.53 Mining condition of the WRL <br /> 1.54 Reclaimed condition of the WRL <br /> 1.42 Reclaimed condition of the WRL under seismic conditions <br /> Young Ranch Resource <br /> December 2021 RULE-6.5 Lewicki & Associates <br />