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iii iiiiiiiiiiiu iiii <br />999 <br />GREG LEWICKI AND ASSOCIATES <br />1645 Court Place <br />Suile 309 <br />Denver, Colorado 60202 <br />(3031629-9335 <br />February 8, 1993 <br /> <br />Joe Dudash <br />Mined Land Reclamation Division <br />1313 Sherman Street 2nd Floor <br />Denver, Colorado 80202 <br />Dear Joe: <br />FEB 1 7993 <br />MINERALS 8 GEOLU(.;`~ <br />Re: Sediment Pond Certification <br />at the Rimrock Mine. <br />Enclosed is the revised certification report for the sediment <br />pond at the Rimrock Mine. I am a certified professional engineer <br />in the State of Colorado with experience in the Eastern and <br />Western United States in the design, construction and operation <br />of sediment ponds and mine hydrology systems. <br />Site inspections were conducted on December 7 and 22, 1992. <br />Inspections and measurements were conducted by myself and Mark <br />Kerr. A precision eye level, stadia rod and measuring tape were <br />used to verify elevations, slopes and dimensions. Additional work <br />was done in Late January and early February to lessen the slopes <br />of the pond embankment. Fill was obtained from the western side <br />of the pond and a keyway was used to tie the old fill to the new <br />fill in the embankment. Pictures are enclosed to depict the final <br />embankment slopes. Since all fill used was simply moved from one <br />side of the pond to the other, there was no change in pond <br />storage volume. <br />Sincerely yours, <br />Greg Lewicki <br />Greg Lewicki and Associates <br />