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C <br /> Bryce Romig 2 Page 2 <br /> • Slurry Cut-Off Wall - Pre-design investigations consisting of 7 coreholes with pressure <br /> packer tests in the underlying bedrock indicate a zone of weathered bedrock above the <br /> unweathered bedrock. Packer tests show the weathered bedrock is low to moderately <br /> permeable (10-4 to 10-6 cm/sec) and may present a pathway for subsurface seepage. To <br /> intercept this potential seepage,the impoundment design would include a slurry wall which <br /> would be excavated through the surficial soils and keyed into the unweathered bedrock. <br /> (The packer tests results indicate the unweathered bedrock may be considered <br /> impermeable.) The slurry wall would have a bulk hydraulic conductivity of less than 10-7 <br /> cm/sec to limit subsurface seepage. <br /> • Conveyance Pipeline - A conveyance pipeline is included in the impoundment design to <br /> allow controlled water flow between Robinson Lake and the impoundment. This feature is <br /> needed to control water levels in Robinson Lake and the impoundment, and may be used to <br /> convey process waters under a mine production scenario. <br /> Since the impoundment includes a zoned-earthen dam, the dam will be designed to meet the <br /> requirements set forth in the "Rules and Regulations for Dam Safety and Dam Construction", <br /> State of Colorado, Office of the State Engineer, Division of Water Resources. <br /> If you should have any questions or comments, please feel free to contact me at (303) 850- <br /> 9852. <br /> Respectfully, <br /> Titan Environmental Corporation <br /> John F. Lupo, Ph.D., P.E. <br /> Project Manager <br /> JFL:sjg <br /> Enclosures <br /> cc: John Clapper, Climax Mine <br /> Mike Ley, Climax Mine <br /> c\altitanWenverkomi mt 417 [April 17,1996 — — — • <br /> Environmental <br />