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� , �,+" II I I II I II I II IIII III <br /> 999 <br /> =Environmental <br /> Titan Environmental Corporation <br /> '939 E Arapahoe Rd , Suite 330 <br /> Englewood, Colorado 80112 <br /> April 18, 1996 Phone (303) 850-985 <br /> Fax: (303) 850-9910 <br /> Project: 6104-001 <br /> Bryce Romig _ l � <br /> Environmental Coordinator g 7 �_ <br /> �►! 7 <br /> Climax Mine ,/r <br /> Highway 91 <br /> Climax, Colorado 80424 <br /> Transmittal <br /> v 0 Percent Design Drawings <br /> No. 1 Dam Impoundment <br /> Dear Bryce: <br /> Enclosed are 2 sets of 3 draft E-size drawings which represent the 30 percent design for the <br /> No. 1 Dam Impoundment. The objectives of the No. 1 Dam Impoundment are: 1) to provide <br /> a basin to intercept process waters seeping from the No. 1 Tailings Dam; 2) to collect <br /> precipitation run-off from the tailings dam face; and 3) to prevent these waters from entering <br /> Robinson Lake. To meet these objectives, the impoundment was located downgradient of the <br /> No. 1 Tailing Dam, along the upper reaches of Robinson Lake. The impoundment includes a <br /> zoned-earthen dam to provide a physical barrier between the process waters collected in the <br /> impoundment and Robinson Lake. The zoned earthen dam would extend across the drainage <br /> to form the impoundment. Components of the impoundment dam include: <br /> • Inner Core - The inner dam core would be constructed of compacted fine-grained soils <br /> amended with bentonite. The bentonite amendment would be added to the soils to reduce <br /> the bulk hydraulic conductivity of the soil to less than 10-7 centimeters-per-second <br /> (cm/sec), thereby limiting seepage through the dam. The amount of bentonite amendment <br /> will be determined based on future soil tests. <br /> • Outer Core - The outer core of the dam would consist of compacted, coarse-grained soils. <br /> The purpose of the outer core is to provide a permeable core which would allow dissipation <br /> of excess core-pressures, increase slope stability, and protect the inner core. <br /> • Rock Rip-Rap - Rock rip-rap would be placed along the entire upstream and downstream <br /> faces of the impoundment dam. The purpose of the rock rip-rap is to protect the outer core <br /> of the dam from being eroded by wave action and to stabilize the dam. <br /> c\althtan\denverVomigxmt 417 [April 17,1996] <br />