Laserfiche WebLink
III IIIIIIIIIIIIIIII <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanment of Nawral Resources <br />1313 Sherman St., Roam 215 <br />Denver, Colorado 80?03 <br />Phone (303185ti-3567 <br />F.AX: (3031 832 8106 <br />February 15, 2001 <br />Powderhom Coal Company <br />C/O Jim Stover <br />J.E. Stover & Associates <br />2768 Compass Drive, Suite 101 <br />Grand Junction, CO 81506 <br />Re: Technical Revision No. 33 -Permanent Dewatering Plan - <br />Powderhorn Coal Company -Roadside Mine - C-81-041 <br />Dear Mr. Stover: <br />DIVISION OF <br />MINERALS <br />GEOLOGY <br />R E C L A M A T I O N <br />MINING•SAFETY <br />Bill pwons <br />Governor <br />CreF E Walcher <br />Executive Direcmr <br />ht¢hael B. Lnng <br />Drvo~on Dueaor <br />The Division has reviewed your letter of January 26, 2001, and has the following additional questions <br />regazding Technical Revision No. 33. Please provide your response to this letter no later than <br />February 23, 2001. <br />1) Based upon our experience with underground mine dewatering systems elsewhere in <br />Colorado, we remain concerned that the proposed North Decline dewatering system will <br />become clogged by underground debris. If the proposed North Decline system clogs, the <br />system would be rendered nonfunctional. Please provide your assessment of this potential <br />risk. <br />2) As an alternative plan, it seems prudent to install a free draining outlet at the -ocation of the <br />backfilled Northwest Intake Portal. Such a system would incorporate a larger diameter drain <br />(or series of drains) which would be less likely to clog than the proposed North Decline pipe. <br />Please provide your assessment of this alternative plan. <br />3) If such an alternative plan is feasible, then please provide the detailed installation designs and <br />schedules. Discuss any other permitting requirements such as MSHA, CDOT or CDPH <br />permitting. <br />Thank you for your prompt attention to this request. <br />L <br />Cc: Dan Mathews <br />Cheryl Linden <br />