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<br />• <br />• <br />EUGENE M. SHEARER, P.E. <br />Consulting Geologist <br />10 July 90 <br />Mr. Bryan Archer <br />Sun Coal Company <br />10200 West 44th Avenue <br />Wheat Ridge, Colorado 80033 <br />Ref: Yampa River Sedimentation Pond, Meadows No. 1 Mine <br />Dear Bryan: <br />The Yampa River Sedimentation Pond was inspected and measured on 6 June <br />90. The accompanying drawing shows the pond as it is functioning today. <br />I understand that the pond was constructed in October 1983 to the <br />following specifications as set forth in Colorado Mined Land Reclamation <br />Board, Meadows No. 1 Mine, Permit No. C-81-029: <br />A. Total volume - 0.05 acre feet (acft) „- <br />a. This volume is calculated to contain a ten year <br />peak flow runoff from an area of 1.29 acres during <br />a rainfall of 1.6 inches. <br />Unadjusted peak runoff factor for ten years <br />(410) = 0.34". Total runoff = 1.29 acres X <br />0.34"/12 = 0.04 acft.- <br />b. This volume includes a sediment storage capacity <br /> <br />of 0.01 acft.- <br />B. Embankment shape suggested to be triangular, 30 feet wide <br />by 30 feet long, an area of 450 square feet (sgft) or <br />0.0103 acres. <br />C. Pond to be 5 feet deep. <br />D. Impoundment sideslopes are to be 3 horizontal: 1 vertical, <br />with a one foot freeboard. <br />E. An 18 inch outlet pipe capable of conveying 5.5 cubic feet <br />• per second (cfs) is to be installed to adequately dewater <br />the pond at the one hundred year peak flow rate of 3.16 cfs. <br />Home <br />Office <br />5720 South Jasmine Street • Englewood, Colorado 80111 5351 South Roslyn Street. Sui(e 200 • Englewood. Colorado 80111 <br />303-771-2371 303-741-2020 <br />