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May 29, 2009 <br />HORSE GULCH FILL STABILITY ANALYSIS aVED <br />or- <br />JUN U d 2009 <br />TABLE OF CONTENTS Divib,- ...(ion, <br />Mining and Safety <br />Page i <br />Page <br />1.0 INTRODUCTION ................................................................................................................ I <br />2.0 SLOPE STABILITY ANALYSIS .......................................................................................1 <br />2.1 Horse Gulch Model Geometry .................................................................................1 <br />2.2 Horse Gulch Model Materials ..................................................................................2 <br />2.3 K-Pit Spoils Properties .............................................................................................4 <br />2.4 Horse Gulch Model Boundary Conditions ..............................................................9 <br />2.5 Horse Gulch Groundwater Conditions .....................................................................9 <br />3.0 MODEL RESULTS .......................................................................................................... 11 <br />3.1 Discussion .............................................................................................................. 16 <br />3.2 Summary ................................................................................................................ 16 <br />4.0 UNDERDRAIN DESIGN AND CONSTRUCTION RECOMMENDATIONS ................. 18 <br />4.1 Underdrain Materials ............................................................................................. 18 <br />4.2 Filter System .......................................................................................................... 18 <br />4.3 Drain Design .......................................................................................................... 20 <br />4.4 Construction Recommendations ............................................................................ 21 <br />5.0 REFERENCES ..................................................................................................................28 <br />APPENDIX A-DESIGN DRAWINGS ................................................................................... A-1 <br />I certify that this report was prepared by me and by other engineers under my direct <br />supervision. <br />0 RE6J?,l <br />w <br /> A <br />C' <br />0?.?tw <br />?ti'• 4 <br />v <br />• <br /> .? o <br />377€414 <br /> <br /> <br />Martin W. Chenoweth, P.E. PROFES L SEAL <br />Senior Associate <br />Agapito Associates, Inc. <br />Agapito Associates, Inc.