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DEPARTMENT OF NATURAL RESOURCES <br />David H. Getchea, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVIQC. SMELTON, Dlrootor <br />Richard D. Lemm <br />Governor <br />MEMORANDUM <br />30 October 1984 <br />T0: Candy Thompson ~~t _ <br />FROM Jim Pendleton <br />RE: Response to Stipula n No. 1, Permit Revision No. 1, New Elk Mine <br />Pursuant to your request, I have completed a review of the geotechnical <br />aspects of Wyoming Fuel Company's response to stipulation No. 1, placed on <br />Permit Revision No. 1 to Permit No. C-012-81, for the New Elk Mine. The <br />company's submittal presents a thorough stability analysis and construction <br />specifications for the sediment pond embankment to be constructed in <br />conjunction with the new waste structure at the New Elk Mine. <br />The report contains boring logs and laboratory test results, within its <br />appendices, for all the materials encountered at the site. The report also <br />presents strength testing results for the materials to be imported to <br />construct the embankment. Acceptable construction specifications and <br />standards are presented within the report. <br />A thorough mathematical slope stability analysis is presented within the <br />submittal. The minimum static slope safety factor is determined to be 1.52, <br />which satisfies our regulatory requirements. Apseudo-static seismic slope <br />stability analysis was also performed and is presented within the report. <br />Using an appropriate seismic acceleration factor of 1.05, the minimum <br />projected pseudo-static slope safety factor is 1.41. <br />The stability analysis and engineered design presented within Wyoming Fuel's <br />submittal satisfy our regulatory requirements and are in conformance with the <br />prudent state-of-the-art of geotechnical embankment engineering. <br />cc: Brian Munson <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />III IIIIIIIIIIIII III <br />999 <br />