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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 C O L O RA D O <br /> <br />Phone: (303) 866-3567 D I V I S I O N O F <br />RECLAMATION <br />FAX: (303) 832-8106 MINING <br /> <br /> SAFETY <br />DRMS INTERNAL MEMORANDUM <br /> Bill Ritter, Jr. <br /> Governor <br />Harris D. Sherman <br />Executive Director <br />DATE: April 4, 2008 Ronald W. Cattany <br />TO: Sandy Brown Division Director <br />FROM: Dan Mathews Natural Resource Trustee <br />RE: Request For Review Assistance <br />Yoast Mine (Permit No. C-94-082) <br />TR-37 (Ownership and Control Updates, Designs for New Postmine <br />Channels, Revised Pond Sediment Modeling, Permanent Facility <br />Requests) <br />TR-37 for Yoast Mine was deemed complete today. The revision includes designs for <br />several new permanent channels that were apparently constructed in locations where <br />gullies had developed on the postmine landscape (I believe these are 3-IA, 4-2, 5-IA, 6- <br />2A, 6-4, and 7A), as well as certain other drainage modifications, and extensive <br />SEDCAD modeling revisions to reflect current conditions as pertaining to sediment pond <br />capacities and cleanout schedules. <br />In addition, the revision includes updates to the Adjudication File including ownership <br />and control changes, and requests for various existing features to be retained as <br />permanent structures (roads, ponds, exclosure fencing, etc.). <br />It appears that I will need review assistance from Johanna Cramer, for AVS check <br />associated with the owner/controller changes, and of course hydrology review for the <br />permanent channel designs, sediment modeling, and permanent impoundment <br />demonstrations. I will also need to request a cost estimate update to reflect costs <br />associated with the new permanent channel segments. <br />I assume Mike Boulay will be assigned the hydrology review, and Jim Stark the cost <br />estimate update. <br />Please forward this memo to Johanna, Mike, and Jim, (or other staff as you deem <br />appropriate). I would like review memos by April 30, 2008, if possible (30th day is <br />May 5, 2008). <br />Let me know if you have questions. <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines