1984-12-15_REVISION - C1981012

• Permit No: C1981012
• IBM Index Class Name: REVISION
• Doc Date: 12/15/1984
• Doc Name: Responses to Permit Conditions and Stipulations
• From: Wyoming Fuel Company
• To: Mined Land Reclamation
• Type & Sequence: PR1
• Media Type: D
• Archive: No

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NQ. p DEPARTMENT OF NATURAL RESOURCES
* David H.Getches,Executive Director
MINED LAND RECLAMATION DIVISION
876 / D"ID C.SHELTON, Director
Richard D.Lamm
Governor
M E M O R A N D U M
30 October 1984
TO: Candy Thompson
FROM Jim Pendleton
RE: Response to Stipula ' n No. 1 , Permit Revision No. 1 , New Elk Mine
Pursuant to your request, I have completed a review of the geotechnical
aspects of Wyoming Fuel Company's response to stipulation No. 1 , placed on
Permit Revision No. 1 to Permit No. C-012-81 , for the New Elk Mine. The
company's submittal presents a thorough stability analysis and construction
specifications for the sediment pond embankment to be constructed in
conjunction with the new waste structure at the New Elk Mine.
The report contains boring logs and laboratory test results, within its
appendices, for all the materials encountered at the site. The report also
presents strength testing results for the materials to be imported to
construct the embankment. Acceptable construction specifications and
standards are presented within the report.
A thorough mathematical slope stability analysis is presented within the
submittal . The minimum static slope safety factor is determined to be 1 .52,
which satisfies our regulatory requirements. A pseudo-static seismic slope
stability analysis was also performed and is presented within the report.
Using an appropriate seismic acceleration factor of 1 .05, the minimum
projected pseudo-static slope safety factor is 1 .41 .
The stability analysis and engineered design presented within Wyoming Fuel 's
submittal satisfy our regulatory requirements and are in conformance with the
prudent state-of-the-art of geotechnical embankment engineering.
cc: Brian Munson
423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel.[phone]