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-iii iiiiiiiiiiiiiiii 999 C c~~us "`~ Yampa Valley Cyprus Yampa Valley Coal Corporation 29587 Roult County Road N27 Oek Creec, •olo ado 80467 303879:380 ~; ~~ V~ n September 27, 1990 David Berry, Reclamation Specialist Colorado Mined Land Reclamation Division 1313 Sherman Street, Room 215 Denver, CO 80203-2273 Dear David: Re: 1990 Annval Pond Inspection and Certification oc r 1 1990 Recta fined Land mation pivision The following information constitutes the annual pond inspection and certification for 1990. This information is submitted in compliance with CMLRD Regulation 4.05.9(8). Pond A The present water elevation within Pond A is at approximately 6934'. This approximates an impoundment volume of approximately 60 ac ft. The sediment level appears to be approaching the design capacity. A survey to determine contained sediment within the impoundment is recommended for 1991. Removal of oversized rip rap and placement of properly sized rip rap is presently in progress. Beavers are active below the dam in the outlet channel but have not moved upstream to the dam. There aze no apparent stability concerns. Pond D Present water elevation within Pond D is approximately 6847'. The sediment level is significantly below the maximum design elevation. Doughty Steel is currently erecting an overland conveyor belt across one corner of the dam and the emergency spillway. The elevation of the dam has not been altered or any of the original material removal during construction other than the concrete footers. The horizontal members of the structure are installed approximately 3' above the emergency spillway elevation so no impact to the impoundment has occurred. The discharge outlet needs to be addressed vvith proper rip rap placement. New rip rap is presently being placed on the emergency spillway.