Laserfiche WebLink
• <br />C c~~us <br />"`R Yampa Valtey <br />September 21, 1995 <br />~ III IIIIIIIIIIIIIIII <br />Cyprus Yampa Valley Coal Corporation <br />29587 Routt County Road #27 <br />Oak Creek, Colorado 80467 <br />303-879-3800 <br />RECEIVED <br />OCT 0 2 1995 <br />Mr. Kent Gorham <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Division of Minerals a Geology <br />RE: PERMIT C-81-071: BLOCKS C AND D PHASE II BOND RELEASE <br />Dear Mr. Gorham: <br />Pursuant to your March 22, 1994 letter detailing questions concerning the Phase II bond <br />release application for Blocks B and C, please flnd enclosed responses to the sedimentology <br />modeling issues you specified. The responses have been developed by Mr. Tom Leidich of <br />TerraMatrix who completed the original modeling. Also enclosed, as a further indication of the <br />erosional stability of the areas in question, please find tabulations detailing the average <br />downcutting in permanent gullies PG1-1 (Block B), PG31-1A, and PG31-1 B (Block C) as <br />measured over the last four years. In general, insignificant downcutting within the measured <br />permanent gullies is indicated. <br />Evaluation of the deposited sediment volume occurring in stockponds within the Block B and C <br />areas will require additional field work as discussed in our most recent conversation regarding <br />this issue. I will forward this information to you as soon as it becomes available. In the interim, <br />please contact me at (303) 870-2730 if you have any questions or require additional information <br />concerning the materials in this submittal. <br />COLORADO YAMPA COAL COMPANY <br />~~~ y~- <br />Karl C. Koehler <br />Environmental Engineer <br />/kck <br />Enclosures <br />cc: Permit No. C-81-071; Blocks B and C Bond Release files <br />