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iiiiiiiiiiiiiiiiiii <br />9 9 <br />GREG LEWICKI AND ASSOCIATES <br />1645 Court Place <br />Suite 309 <br />Denver, Colorado 80202 <br />13031629-9335 <br />April 26, 1993 <br />Joe Dudash <br />Mined Land Reclamation Division <br />1313 Sherman Street 2nd Floor <br />Denver, Colorado 80202 <br />Dear Joe: <br />a~l~E4~EC, <br />APR 291993 <br /> <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. A <br />final inspection was conducted on April 22, 1993. Inspections and <br />measurements were conducted by myself and Mark Kerr. A precision <br />eye level, stadia rod and measuring tape were used to verify <br />elevations, slopes and dimensions. Additional work has been <br />completed so that the pond slopes are totalling 5:1 at any point <br />along the dam. Compaction tests are being made on the embankment <br />by a geotechnical firm from Pueblo. The results of the tests will <br />not be available until next week. Acceptable compaction results <br />should be attached to this certification and make the <br />certification complete. <br />Sincerely yours, <br />Greg Lewicki, P.E. <br />Greg Lewicki and Associates <br />