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<br />6-19-06 09:40 Fro -Ul./Thovpson Inc. 9702009441 T-094 P.002 F-001 <br />CTL I THOMPSO <br />,;:.... <br />May 15, 2006 <br />CGRS <br />P.O. Box 1489 <br />1301 Academy Court <br />Fort Collins, Colorado 80522 <br />Attention: Mr. Joby Adams <br />Subject Transmittal Letter for Geotedmical Exploration <br />Durham Pit Slope Stability Evaluation <br />Varra Mine <br />Greeley, Colorado <br />CTLIT Project No.: FC03746-125 (Revised) <br />Attached are geotechnical date and slope stability figures for the embankment for <br />the Durham Pit at the Varra Mine In Greeley, Colorado. Six borings were drilled at <br />selected locations along the existing embankment alignment (Figure 1). Samples of the <br />soils and bedrock penetrated by the borings and cuttings were classWied (Figure 2 and <br />Table 1). In summary, there appear to be no stability problems with the section of levee <br />you asked us to analyze (43+40). <br />Variations in the subsoil conditions not Indicated by our borings are possible. We <br />believe this exploration was conducted with that level of skill and care ordinarily used by <br />geotechnical engineers practicing in this area at this time- No warranty, express or <br />implied, is made. If we can be of further service in discussing the contents of this letter, <br />please call. <br /> <br />Division <br />4001 Automation Way I unit 2011 Fort Collins, Colorado 80525 <br />Telephone:970.206-9455 Fax 970-2p6-WI <br />(3 copies sent)