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STATE OF COLORADO <br /> DIVISION OF MINERALS AND GEOLOGY <br /> Department of Natural Resources <br /> 1313 Sherman St., Room 215 <br /> Denver,Colorado 80203 <br /> Phone:(303)866-3567 <br /> FAX:(303)832-8106 <br /> May 26, 1995 DEPARTMENT OF <br /> NATURAL <br /> Mr. Hal Pranger RESOURCES <br /> Office of Surface Mining Roy Romer <br /> 1999 Broadway Governor <br /> Suite 3320 James S Lochhead <br /> Denver, Colorado 80202 Executive Director <br /> Michael B Long <br /> Division Director <br /> RE: Containment Furrow Designs, Coal Basin Mine <br /> Dear Hal: <br /> Enclosed are pertinent maps and other information regarding the <br /> containment furrows at Mines 3 and 4 . <br /> The concept to be employed is to contain water on the bench while <br /> the vegetation is becoming established on the bench and outslopes. <br /> The Forest Service, who states that they will control this property <br /> as a result of pending land exchanges, wishes to have surface flows <br /> run off of the bench as sheet flow. They are not interested in <br /> construction of diversion ditches and other more intrusive <br /> practices being employed. It is anticipated that the containment <br /> furrows would have a life of under ten years. They should have <br /> outlived their usefulness by then, and will either be silted in or <br /> could be graded out to accommodate the Forest Services desires of <br /> having free draining benches. <br /> Included in this package are copies of draft conceptual plans, maps <br /> showing furrow locations, and a conceptual cross section. we are <br /> looking for a simple design which meets the containment concept, <br /> which is temporary in nature and which is stamped by a Professional <br /> Engineer, if possible. The best case is to have a generic design <br /> which could be fitted to each of the reclamation areas. If <br /> possible, we would like to have the design by June 14, 1995. <br /> Thanks for your help on this project. Please contact me at ( 303) <br /> 241-0336 (2148 Broadway, Suite C-5, Grand Junction, Colorado 81503) <br /> if you have questions or comments. <br /> Sincerely, <br /> Steven Renner <br /> Project Manager <br />