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~• •1 A~}I 1.11 I. rll rll,A nil i~l~i~:. I11)I~ l,.~Y ~.i.~. ii <br />~ - DERARTMENI OF NATURAL RESDU R(;ES <br />Harrls D. $IVV m:m. E+ecutivc Dir rclnr <br />1 <br />nt inl i~:n i,:~~ti a t~ i;~:~.nn~ A~r~un~ <br />!~ 723 Centennial Building, 1313 Sherman Street <br />Denver, Colorado 80203 Tel. (3031 8393567 <br />Hamlet J. Barry, II I, <br />Director <br />June 23, 1980 <br />T0: Rick PSills <br />/"' _~ _ <br />FROM: Jim Pendleton \` - - y <br />,r` s\~ <br />RE: Final Recta Lion of t,l~b No. 16289 Lease Area of Energy Fuels' No. 1 Mine <br />I have reviewed the map entitled "Back filling and Spoil Grading Plan Area <br />East of Shop and 16289" and the accompanying "16289 Reclamation Cross-Sections <br />A-A prime, B-B prime, C-C prime, and Ax.i.al Section D-D prime". These maps <br />and cross-sections were prepared and submitted by James Griffin, Chief Field <br />Engineer, Energy Fuels Company. Based upon the configuration of the base of <br />the backfilled low-wall and the adjoining reclaimed surface, I think it <br />doubtful that any accumulation of moisture within the backfilled pit could <br />cause stability problems in the neighboring backfilled spoil. Moisture which <br />might accumulate at the base of the low wall will migrate down gradient along <br />the low-waZ1 base towards the northwest away from the area in question. <br />In addition, the cross-section supplied in the area near the southeastern terminus <br />of the 16284 pit area (cross-section A-A prime) demonstrates that tl~e final <br />reclaimed surface averages approximately 23% with maximum local slopes of <br />approximately 30%. The final slope does not qualify, therefore, as a "steep <br />slope" situation. In accordance with section 30 CFR 715.14 of the interim <br />federal regulations, the area will Dave to backfilled to approximate original <br />contour. <br />Spoils which have not been graded in the area of cross-~:ecti on A-A prime, have <br />experienced some stability problems. Final grading should improve their <br />degree of compaction, significantly reduco their angle of slope, and decrease <br />the infiltration of precipitation. All of these factors should aid in achieving <br />the stahle reclaimed ground surface. It may be prudent for Energy Fuels to <br />retain the servi-es of an appropriately qualified specialist to assist them <br />in designing a sufficient standard specification for final grading of the <br />16289 lease area. Bond release w.i11 not be possible if the final reclaimed <br />surface demonstrates unstable tendencies. <br />/k <br />