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Mr. Jim Matters <br />July 6, 2006 <br />Page 6 <br />CONCLUSIONS <br />A site reconnaissance was performed to examine current condition of the dam site and <br />expected soil conditions. Laboratory test resuhs from soil samples previously taken at the site <br />have been reviewed and appropriate soil properties estimated for the proposed dam. A 2D <br />numerical model analysis of a section of the embankment was performed to assess stability of <br />the upstream and downstream embanlmrents. The computed safety factors are FOS = 2.3 for the <br />8-ft-high dam and FOS = 2.0 for the 12-ft-high dam, Both of these values aze larger than the <br />required 1.3 factor of safety for impoundment dams. These results are thought to be <br />conservative provided construction control is implemented and the site is not substantially <br />different than expected It has been recommended that field verification of conditions be <br />performed and as-buih stability verified. <br />I hope we have addressed your request related to assessing slope stability of the <br />Deal Gulch impoundment dam. Should you have questions, please contact me or Michael Hardy <br />to discuss this letter report at your convenience. As always, we appreciate the opportunity to <br />assist Trapper Mining in addressing their geotechnical engineering issues. <br />Yours sincerely, <br />John P. Tinucci <br />Senior Associate <br />JP1'/smvf <br />Attacfimmts(11): PLotos I-5 <br />Figures 1-9 <br />Agapho Associates, Inc. <br />