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of c~~ <br />,~~: ~~/~~O~a <br />e d~irJ13![4 9Q <br />c o <br />r G,~ >• <br />X876 s <br />Richard D. Lamm <br />Governor <br /> <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DI\ <br />DAVID C. SHElTO N, Director - <br />999 <br />February 9, 198 <br />Mr. Larry Reschke <br />Grand Mesa Coal Company <br />P. O. Box 226 <br />Delta, Colorado 81416 <br />RE: Refuse Pile Compaction Requirements - File No. C-034-81 <br />Dear Mr. Reschke: <br />The January 10, 1984 letter prepared by Rocky Mountain Geotechnical, Inc., <br />contained within Volume 11 of the Red Canyon Permit Application discusses <br />potential effects of the variance from the original compaction standards <br />on final waste pile slope stability. <br />The consultant indicates that, based upon their general experience, sub- <br />standard compaction would probably not reduce the factor of safety below <br />the required 1.5. The letter observes, however, that this projection is <br />not based upon either specific shear strength testing or rigorous <br />computer analysis". <br />In order to approve a variance from the original compaction standards, a <br />complete geotechnical analysis as referred to by the consultant would be <br />required. In the future, material should be compacted so as to achieve the <br />originally assumed material density of 78.7 lbs/cubic foot, unless a technical <br />revision supported by an appropriate geotechnical analysis is approved by <br />the Division. <br />If you have any questions regarding this issue, please contact me. <br />Sincerely, <br />,.~ l <br />~~ ~~ <br />Dan Mathews <br />Reclamation Specialist <br />DM/mab <br />i <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />