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~ ; , . ~ wit ~/Q/T 2 ~ <br />• ~ ~ Leonard Rice Consulting Water Engineers, Int. Leonard R,cr: <br />- (3031 455-9569 ! 2695 Alcott Street ; Denver, COVOr800 80211 Lrslie H 3n;'~a- <br />Rooert E Bron7en <br />R1~~~.9 ~'~ ~.~ <br />January 31, 1980 <br />f~AY 1 ~ 1980 <br />Mr. Geoffrey P. Saunders PAINED LAND RECLANIATIOiJ <br />Energy Fuels Corporation <br />Box G Colo. Dept. of Natural Resources <br />Steamboat Springs, Colorado 804;7 <br />Dear Jeff: <br />In accordance with your Dece^ber -. 1979 letter outlining our <br />priorities for assignments re,ardin~r the Kerr and Mine ~o. ~ <br />sediment control projects, please find enclosed our ~re- <br />liminary hydrologic analysis for ?line No. 3. Included for <br />your review and discussion, Ire three summary tables. he <br />first identifies the sedimentation pond or sump tributary <br />areas, weighted AMC-III curve numbers and the 10, 25 and <br />100-year design volumes and peak runoff rates. The second <br />presents the sediment storage requirements, preliminary pond <br />volumes, and embankment height :Vnd elevation information. T'he <br />third table presents all the appropriate information concern- <br />ing the diversion ditches associated with this plan. Also <br />transmitted herewith is a location man of the Mine No. 3 area <br />identifying the nine ponds, two sumps and 26 diversion <br />ditches that we feel are required, based on our "first cut" <br />analysis, to adequatly control sediment pursuant to the appli- <br />cable Federal and State regulations. <br />As you are well aware, the Mine No. 3 area presented numerous <br />complications for providing adequate sediment control fac- <br />ilities, while remaining within the ;•uidelines of the regula- <br />tory agencies. Although we feel. that we have prepared a <br />satisfactory plan, some questions and solutions to the moc,t <br />troublesome areas still remain to be solved. As a result. 1 <br />have presented below two groups of. material for your consider- <br />ation. The first is a listing of the basic criteria and <br />assumptions utilized in preparing our plan, and the second is <br />a set of comments and recommei;dations su;gesting alternative <br />solutions and/or policy decisions rehich Fnergv Fuels' ::orpora- <br />tion should consider. <br />Assumptions and criteria: <br />All sediment storage requirements r:cre determined utiliz- <br />ing 0.1 acre-feet per acre of disturbed land. <br />MydroloGy <br />Water Rip'lI5 <br />e r,~vonmental Analysis <br />Urban Drainage <br />