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Environmental Consultants, Inc. fdECEii/ED <br />1'.'.! 0,2 2003 <br />bwia~on or Minerals and Geology <br />May 23, 2003 <br />Mr. Henry Barbe <br />Mountain Coai Company LLC <br />5174 Highway 133 <br />Somerset, Colorado 81434 <br />RE: West Elk Mine <br />Mine Water Control Plan -Culvert Designs <br />Dear Mr. Barbe: <br />The culvert designs shown in Table 44E of the Mine Water Control Plan have been <br />reviewed to determine the adequacy of the culvert diameters for the listed discharges. <br />The a ttached p rintouts from the c ulvert u tility f unction of t he S edCad4 software s how <br />that the headwater depth of each culvert is approximately one diameter or less. The <br />attached Homographs verify the SedCad4 findings. <br />Culvert C2R-4 was originally specified as a 36-inch pipe. Our review confirmed that a <br />30-inch pipe is sufficient for the flow shown in Table 44E. <br />Thank you for this opportunity to provide services to Mountain Coal. Should you have <br />questions or wish further discussion, please call me at (303) 850-0930. <br />Sincerely, <br />~~ ~" ` _ _' l~ ` "'1 <br />Mike Kolin, P. E. <br />Engineering Manager <br /> <br />~,~ <br />5231 South Quebec Stree[ • Greenwood Village, Colorado 80111 <br />Phone (303) 850-0930 • Fax (303) 72]-9298 <br />Web Site: www.greystone-consultants.com • E-mail: greystone@greystone-consultants.com <br />