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<br /> <br />STATE OF iii iiiiiiiiniiiiii <br />999 <br />COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Deparlmenl of Natural Resources <br />1313 Sherman 51 . Room 215 lr~l1 ~/f ~ ~ ~ <br /> <br />Denver, Colorado 80203 ~I~~~ <br />Phone: 13031 866 3567 <br />FAX. (3011 83 2-81 06 <br /> DEPARTMENT OF <br /> NATURAL. <br />Mr. Murari Shrestha RESOURCES <br />western Fuels-Utah <br />405 Urban Street R°v Rnmrr <br />G °vernrn <br />Suite 305 <br />tames ti. Lochhead <br />Lakewood, Colorado 80228 e.°e°~~~eohe~~°r <br /> M ¢ha rl B I img <br />RE: Deserado Mine (C-81-018) o„-~~~°n oneu°r <br />Pond RP-4 Emba nkment Investigation <br />Dear Mr. Shrestha: <br />Jim Pendleton, our staff engineering geologist, has just recently <br />reviewed the geotechnical investigation report prepared by Lincoln- <br />Devore, Inc., in regard to the cracking observed on the Pond RP-4 <br />embankment earlier this year. Dr. Pendleton indicated that in his <br />opinion the approach taken by the consultant appeared to be <br />appropriate, and the conclusions plausible. <br />We are requesting that one additional measure be taken to monitor <br />stability of the embankment. A pair of survey monuments should be <br />installed in the area of the cracking (5' roof bolt driven into the <br />embankment at centerline and collared 18" deep in concrete should <br />suffice). The monuments should be surveyed immediately after <br />installation this fall, and then surveyed quarterly for one year in <br />addition to the required embankment visual inspections. The <br />installation and initial survey should be completed within two <br />weeks. If no significant movement has been documented in one <br />year's time the surveying can be discontinued. The monuments, <br />however, should be maintained for resurveying in the future if any <br />significant movement were to be suspected during future <br />inspections. <br />Please contact me if you have any questions or objections to this <br />request. <br />Since 1 , <br />~~~~~ <br />Dan T. Mathews <br />Environmental Protection Specialist <br />cc: Larry Routten, DMG <br />Jim Pendleton, DMG <br />Gordon Bell, Deserado Mine <br />