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SEDD�EXr ABM DRAMM7, CaTI. L <br /> 5 i�I,G 1'G.RES <br /> FOR <br /> Coal iIines 3, 4, & 5 <br /> Coal Basin, Pitkin County <br /> Introduction <br /> The Coal Basin Mines 3, 4, and 5 are owned and operated by Mid-Continimt <br /> Resources, Inc. at Carbondale, Colorado. ' Inese three coal mines are in Coal <br /> Basin in Wdstern PitkLri County .eithgin v'4lLite River National Forest. <br /> Access to the area is south and wart fnTza Gla ood Springs to Carbondale <br /> on Colorado highway 51 then south. to Redstone on Colorado hi.giway 133. Th-e- ;-E.ne <br /> District office is 3.5 miles west from Redstone on pr vate roads. <br /> The purpose of this study is to met stipulations presented to IMAd Ccntinent <br /> Resources, Inc. by the Colorado rLned Lei Reclamation Board on Augast 31, 1979. <br /> Morrison-Knudsen Company, Inc. became involved -with this project on October 5, <br /> 1979. <br /> The rate of the stipulations involved the need for i=rove tts on exist- <br /> ing sedimentation and drainage ccnLrol strLctures for :'pines 3, +, sd 5. All of <br /> these mines are undergrctid nines with portals at high altitude (10,000 ft.) and <br /> in very =nantaincus terrain. <br /> YA-thods <br /> Design criteria for the Mines 3, 4, and 5 have been developed using U. S. <br /> Soil Conservation Service Methods. References used Include; Dete=dnation of <br /> Peak Flcras -,,^.thin Colorado (1977) , SCS Tec-nacal Note 50 and National Engineer- <br /> ing Han&o6k, Number 4. <br /> Tye calculatiolls are described in detail in the a+atacraPd appendix. T-e <br /> attached 7 plates show desi.Fn details for each mine pad area. <br /> Design of sedimentation structures is based on office of Surface H*Lning <br /> Regulat ,o s (Federal Register, :'arch. 1979) <br /> -1- <br /> 43 <br />