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5-18-00 00:40 From-CTI./Thospeon Inc. 8702000441 T-004 P.002 F-001 <br />CTL I THOMPSO <br />May 15, 2006 <br />CGRS <br />P.O. Elox 1489 <br />1301 Academy Court <br />Fort Collins, Colorado 80522 <br />Aitenti'on: Mr. Joby Adams <br />subject Transmittal Letter for Geotechnical Exploration <br />Durham Pit Slope Stability Evaluation <br />Varna Mine <br />Greeley, Colorado <br />CTLIT Project No.: FC03746-125 (Revised) <br />Attached are geotechnical data 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 classified (Figure 2 and <br />Table II). 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 expioration 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 />93340 54 WE <br />, PE <br />Hdward A- <br />Division Manag ""' <br />(3 copies sent) <br />4001 Automftlon Way I Unit 2011 Fort Collins, Colorado 80525 <br />Telephone:970-206-9455 Fax970-206-9441