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2002-05-13_PERMIT FILE - C1981041 (3)
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2002-05-13_PERMIT FILE - C1981041 (3)
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Last modified
8/24/2016 2:18:39 PM
Creation date
3/30/2009 12:21:11 PM
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Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
Permit File
Doc Date
5/13/2002
Doc Name
A-3 Geotechnical Investigations
Section_Exhibit Name
TAB 13 APPENDIX 13-4
Media Type
D
Archive
No
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slope stability analysis. With this option, a large number of circular <br />• failure planes are analyzed. In this analysis the comFuter will locate <br />the "critical" failure surface which developed the minimum factor of <br />safety for the slope conditions. <br />For the waste pile configuration with side slopes of approximately <br />3.3:1, as shown on the drawings provided to ROCKY MOUNTAIN GEOTECHNICAL, <br />the critical factors of safety were as follows: <br />For the uphill (left) side of the section, a factor of safety of <br />2.702 was determined. <br />For the downhill (right) side of the section, a factor of safety of <br />2.302 was determined. <br />As car; be seen by compar9ng these numbers with the 1.5 minimum recom- <br />mended factor of safety for stable slopes, this slope configuration <br />• would be considered quite stable. <br />Since the factors of safet}~ from the anal}•sis exceed the 1.5 mini- <br />mum recommended value, the slopes probably could be substantially <br />steeper and/or higher, and still maintain an acceptable factor of safety. <br />Increasing the slope angle and height would be desirable from an economic <br />standpoint, as this would increase the height of the pile. This would <br />also be desirable from an environmental standpoint, since if more <br />•~aste material can be stored at this location without disturbing addi- <br />tional ground, then less area will be required for waste disposal at <br />other sites in the future. Therefore, the anal}psis was continued in <br />order to maximize the volume of storage in the pile without violating <br />the 1.5 minimum recommended factor of safety value. <br /> <br />
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