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I ^pl,:p$rn Pf UI)erttr:$ <br />November ?. ZOC6 <br />Page 3 <br />The rnodeled section, esrimared shear strengths uses ter the analysis, 2nd slope stability <br />results arc, shown on Fig. 4. The results indicate a calculated critical :minimum! fartnr pf <br />safety of 1.7, indicating a factor of safety grrater than the minimum factor of safety of <br />1.5. <br />Recommendations and Considerations: In ou• opinion, and based on the analysis results <br />presented above, Rermanent mine slopes for the expansion that are inclined no steeper <br />than 2:1 (horizontal:verticall should be adequately stable with respect to deep-seated earth <br />slumping and/or sliding. Measures to help mitigate shaL'ow sloughing, rifling or other <br />surface erosion features along the proposed slopes should be implemented. These include <br />properly vegetating the slopes, and directing surface drainage away from toe and the top <br />of the slope. We recommend :hat a minimum offset distance between the top of the slope <br />and ;he property line and~or temporary stockpile areas of 10 feet be provided to provide <br />room for sloping the ground away from the cut slope. It necessary, a diversion Swale or <br />ditch should be provided in that zone to prevent excessive runoff onto the slope fat:?. <br />Lmitations: This study has heen conducted in accordance with generally accepted <br />geoter.hnicai engineering practices in this area for exclusive use by the client for design <br />purposes. The conclusions and recommendations submitted in this report are based upon <br />the data obtained from the geologic reconnaissance, surface sampling at the locations <br />indicated on Fig. 1, and information from completion welts performed by others. If during <br />construction., fill, soil, rock or water conditions appear to be different from those described <br />herein, Kumar & Associates, Inc. should be advised at once so that a re-evaluation of the <br />recommendations presented in this report can be made. Kumar & Associates, Inc. is not <br />responsible for liability associated with interpretation of subsurface data by others. <br />If you have env questions regarding our findings, opinions or recommendations, please <br />call. <br />Sincerely. <br />KUMAR & ASSOCIATES, INC. <br />Greg J. Monley. P.E. r .,'+` <br />l,- <br />Rev, bV: AFC {.r ,' ?" .~.; :.~- ... <br />Attachments `~V'% `•r,.,;, .; j' - <br />cc: book, file 4'=~,y:~ ~ ~~ <br />OS ~'S56 ~. y.. <br />Kumar & Associates, Inc. <br />