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OF CO(p~ <br />cw ~ _ .p <br />~~ ~ X~t"~ 9Q DEPARTMENT OF NATURAL RESOURCES <br />~ !~ y,p I~ O David H Geicnes, EaecWive Dnector <br />" ~~" MINED LAND RECLAMATION DI\ <br />* `g76 + DAVID C. SHELTO N, Director <br />Richard D. Lamm <br />Governor <br />April 24, 1986 <br />Mr. Jim Stover <br />Blue Ribbon Coal Co. - <br />P.O. Box 1352 <br />Palisade, Colorado 81526 <br />Re: Mid-term review revision including pond Flo. 5, Blue Ribbon mine, <br />Fi 1 e Flo.: C-81-047 <br />Dear Mr. Stover: <br />iii iiiiiiiiiiiiiiii <br />999 <br />We have complete our adequacy review of the materials you recently submitted <br />addressing construction of pond No. 5. We have several comments and questions <br />regarding your proposal, as follows: <br />1. What is the proposed topography of the reclaimed pond Flo. 1 area? <br />2. During reclamation of pond No. 1 what stream channel reconstruction <br />activities are to be done along Hubbard Creek where it is immediately <br />adjacent to the pond No. 1 embankment? <br />3. What erosion control measures are to be taken for the reclaimed pond <br />No. 1 area? <br />4. Acreage figures for areas 2, 4, 5, 7 and borrow area in Appendix C, <br />pages 8 and sheet 5 do not match. Our rough planimetering does not <br />yield a number that is close to the figure on page 106ii. Please <br />submit accurate acreage figures for all these areas, along with the <br />curve numbers used, assumptions made, and your calculations for water <br />and sediment volumes. In addition submit your sizing calculations for <br />the dewatering device, and determination of detention time and the <br />sizing calculations for the emergency spillway and peak flow <br />calculations for the 25 year 24 hour precipitation event for pond 5. <br />How is seepage along the conduits in the embankment to be controlled? <br />5. A stage-storage chart of state vs. volume should be submitted that <br />identifies the 60b sediment cleanout level, 100 sediment level and 10 <br />year 24 hour water volume. <br />423 Centennial Building, 1313 Sherman S[reet Denver, Colorado 80203 Tel. (303) 866-3567 <br />