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S III IIIIIIIIIIIIIIII 999 STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Depanmenl w Nahiral Resources 1311 Sherman SL, Room ] 15 Denver. Colorado 8U'_03 Phunc UUSI Hhh-356: FAX: 13U'i183! NIOh October 20, 1998 Donald W. MacDonald ~~ DEPARTI~AEN'I OF NATURAL RESOURCES Rny Romer Governor Manager, Energy Services lames 5. Lochhead Coors Energy Company E~ecunve Director Michael B Lung P.O. Box 467 Dimsion Director Golden, Colorado 80402 Re: Keenesburg Mine, C-81-028, 1996 and 1997 Annual Hydrology & Reclamation Reports Deaz Mr. MacDonald: Thank you for the subject reports. With regard to vegetation information, comments appropriate to the 1996 Quantitative Vegetation Study, Phase II Bond Release, Coors Energy Company, Keenesburg Mine, Keenesburg, Colorado, were provided in correspondence relating to the Phase II bond release, and are not duplicated herein. The proposal to modify the acquisition of water samples from wells (page 33 of the 1496 report) has been accomplished via the permit renewal (#3) process (pre-pumping samples aze not processed for laboratory analyses). As we discussed by telephone on August l 1, 1998, monitoring wells DH122 and DH96 aze retained in the monitoring program (page 34, 1996 AHR). The surface water hydrology portions of the report present a good summary of activities. The Division of Minerals and Geology (Division) has no questions regarding ash disposal. These sections of the reports aze well written and complete. The acreage corrections between the 1996, 1997, and previous reclamation reports due to more precise surveying aze noted, and were reconciled to the current bond release evaluations. Airspace volumes (mass balance evaluations) were also reviewed at that time. The Division concurs in the CEC observation that the computer-assisted graphics and analyses are of increasing value. The addition of the dates of seeding to all azeas on the Vegetation Sampling Locations drawing of the 1997 report (annotated Appendix L-5) enhances communication and better documents your achievements. (In this regard, in the next report, please add the date of seeding to the 10.5-acre piece in the northwestern-most part of reclamation.) To filrther demonstrate your reclamation activities, please consider, in future reports, describing and dating azeas of completed backfilling and grading awaiting initial seeding (an example would be the staging area where the dragline was stored, and now, the backfilled and graded portions of Pit A).