Laserfiche WebLink
GEOTECHNICAL STABILITY EXHIBIT <br /> There are no buildings or any structures outside the permit area which could be affected by the <br /> excavation. Sufficient buffers will be maintained to neighboring property lines. <br /> The final slope will be created during mining, and thus no backfill will be needed. The sand and <br /> gravel will be mined to a 3H:1 V slope with a loader and dozer. The native alluvial material is best <br /> classified as sand and gravel, mixed grain size. It has an internal angle of friction of 45 degrees and <br /> no cohesion. Material properties area derived from Table 2.5 in the SME Mining Reference <br /> Handbook', as there is no site specific sample data of the material available. <br /> A GALENA model was developed of the mining and reclamation slopes. This model can be found <br /> on the attached pages. Iterative analysis was used to find the lowest Factor of Safety. <br /> The Factor of Safety of the permanent slope is 3.0. Since this is the slope being mined to,the Factor <br /> of Safety for the steepest slope closest to any neighboring structure is also 3.0. <br /> Ben Langenfeld, P.E. <br /> P.E.# 0047151 <br /> .20047151 <br /> 'Original source:Houk and Bray 1977 <br /> Sievers Pit (;rey Lcw icAl anJ:Ss a'ia R•s YLL( <br /> September 2019 <br />