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STATE OF CC III ~II~I~~II~~II ~~~ <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />• 1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />303 866-3567 <br />Fn X: 303 832.8106 <br />of COQ <br />~~~ ~ <br />re~ ~p <br />~ r876 ~ <br />Ray Romer. <br />Govemar <br />September 30, 1991 Free R. Banta. <br />Division Director <br />Mr. .411en Weaver <br />Energy Fuels Coal, Inc. <br />PA. Box 449 <br />Florence, Colorado 81226 <br />SUBJECT: Waste Pile Quarterly Certification, <br />Southfield Mine, C-81-014 <br />Dear Mr. Weaver: <br />Review of the August 7, 1991, quarterly Waste Pile Certification suggests that <br />Mr. David Brent, P.E., has Some reservations about construction of the waste <br />pile. Specifically, the staff understands that the engineer is concerned that <br />the original stability modeling used material strength characterization that <br />is unrepresentative of the material currently being placed on the pile. The <br />Division appreciated the engineer's candor and shares in his concern. <br />• Therefore, to ensure compliance with Rules 4.10.1(1)(a) and 4.09.1(2), the <br />Division requests that Energy Fuel; prepare a plan for resolving Mr. Brent's <br />concerns within thirty (30> days. This plan should include a sequence of <br />activities :vhich would evaluate the propriety of the existing stability <br />evaluation of the waste pile. These activities may include, but are not <br />limited to performance of solve analyses and proctor tests to characterize the <br />waste material currently being disposed on the pile. Comparative samples <br />could be collected and characterized from both older sections of the pile as <br />well as newly constructed portions of the pile. These values Should be <br />compared with the waste material characterization assumed in completing the <br />previous stability analyses. If the current waste differs from the assumed <br />materials then a shear strength determination should be completed in the <br />laboratory, and this material strength value should be used to reevaluate the <br />slope Stability of the waste pile. Lastly, the operator should prepare a <br />mitigation plan should the evaluations suggest that the pile is unstable. <br />Please call Mr. Jim Pendleton or me if you have any questions. <br />Sincerely, <br />(~J <br />Catherine W, Begej ~~~ <br />Reclamation Specialist <br />CWB/eke <br />• cc: James A. Pendleton, MLRD <br />8528E <br />