Laserfiche WebLink
Table GS-1. Factors of Safety for Slope Stability <br /> Slope Condition Lowest Factor of Safety Distance from Failure Circle to Nearest Structure <br /> Full Mining 1.82 Roughly 50 ft to the property line,where a fence is. <br /> Final 2.03 Roughly 50-ft to the property line,where a fence is. <br /> Reclamation <br /> Active Highwall , <1.5 Roughly 50-ft to the property line,where a fence is. <br /> 2. Conclusion <br /> The Full Mining and Final Reclamation slopes both have a minimum factor of safety (FoS) of <br /> greater than 1.5. The failure circles of these slopes at their lowest FoS are within the <br /> disturbance area of the pit. The Active Highwall's lowest FoS are below the minimum of 1.5, this <br /> is to be expected from a vertical slope during operations. This slope is not permanent. To <br /> ensure that this slope does not risk offsite structures, the FoS = 1.5 failure circle was located to <br /> determine its extents. The FoS = 1.5 failure circle is within the disturbance area of the pit. No <br /> failure circle reaches the permit boundary or offsite structures. <br /> The slope stability analysis in this permit has been prepared according to appropriate <br /> engineering standards and practices. <br /> •L .. <br /> ti <br /> 2115/26j,. <br /> 'SYONP- ' <br /> Ben Langenfeld, P.E. <br /> P.E.# 0047151 <br /> Hayden Gravel Pit Lewicki&Associates <br /> December 2022 <br />