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2009-12-29_REVISION - M1979131 (12)
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2009-12-29_REVISION - M1979131 (12)
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Last modified
6/15/2021 5:55:53 PM
Creation date
1/5/2010 7:54:09 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1979131
IBM Index Class Name
REVISION
Doc Date
12/29/2009
Doc Name
Adequacy Response
From
Greg Lewicki and Associates, PLLC
To
DRMS
Type & Sequence
CN1
Media Type
D
Archive
No
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G EOTECHNICAL STABILITY EXHIBIT EXHIBIT eeteekitieal <br />}There are no buildings or structures outside the permit area which could be affected by the <br />operation. All final slopes in reclamation, as shown on Map F, show that 3H:1 V will be the <br />minimum slope. The existing gravel material has few fines and the material does not get its <br />strength from cohesion, but internal angle of friction. Partly rounded gravel of this type in place <br />has an angle of repose of approximately 40 degrees. For non- cohesive soils, this is also the <br />internal angle of friction of the material. The overall slope of 3H:1 V is an angle of 18.4 degrees; <br />therefore, the factor of safety is 40/18.4 or 2.17. <br />I, Greg Lewicki, P.E., with over 20 years of experience in mine slope safety analysis in <br />Colorado, state that this is true and that this factor of safety is adequate to prevent failure of the <br />slopes. <br />Greg Lewicki, P.E. <br />Korinek 41 Pit August 09 U -1 <br />
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