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=~= TerraMatrix <br />Engineering & Environmental Services <br />iii iuiiiiiniu iii <br />sss <br />1475 Pine Grove Road • PO Box 774018 <br />Steamboat Springs, Colorado 80477 <br />303-879-6260 • fax 303-879-9048 <br />January 7, 1994 <br /> <br />~nra 1 ~ ~Us4 <br />Mr. Wallace Erickson <br />Department of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br /> <br />Re: Energy Fuels Mining Company (EFMC) Raton Creek Mine Pond Certification <br />(Permit No. C-82-055) <br />Dear Wallace: <br />Accompanying this letter for your review, is the As-Built Map showing the current configuration <br />of the sedimentation pond. Excavation of the pond was completed on December 30, 1993 and the <br />survey was conducted January 4, 1994. As shown on the As-Built Map, the capacity of the existing <br />pond is both adequate and consistent with design requirements. However, a few minor changes are <br />required. A minor depression at the north end of the embankment needs to be raised approximately <br />0.4 feet to an elevation of 6352.4 feet, the invert of the emergency spillway also needs to be lowered <br />0.5 feet to an elevation of 6350.5 feet, and the invert of the principal spillway needs to be lowered <br />to an elevation of 6342.1 feet. <br />These changes should be complete by January 11, 1994. Upon completion of these changes and <br />following your review of the As-Built Map and receipt of any comments, a certified copy of the map <br />will be submitted by January 5, 1994. Please feel free to contact me if you have any questions or <br />require further information. <br />Sincerely, <br />TerraMatrix/ACZ Inc. <br />~ ~~/~ <br />Thomas E. Leidich -- <br />Project Engineer <br />cc: Al Weaver <br />J. Nettleton <br />Steamboat Springs, CO • Denver, CO • Seattle, WA • Juneau, AK. Santiago, Chile SA <br />