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J.E. Stover & Associates, Inc. <br />Slope Stability Analysis, Road Fill and Portal Fill <br />Roadside Mine, Cameo, CO <br />January 26, 2007 Page 3 <br />Mesa Verde Formation as "bedrock," and no failure plains were allowed to pass through the formation. <br />This limitation on the failure plains shortened the "slip surface" and resulted in a slightly lower factor of <br />safety (FS) for the man-made fills and in-place native soils, for those trial surfaces that would intersect <br />the Mesa Verde Formation. <br />The direct sheaz testing was accomplished using multi-stage testing on single samples, using methods <br />similar to that described in Gan, Fredlund & Rahardjo, "Determination of the Sheaz Strength Parameters <br />of an Unsaturated Soil Using the Direct Sheaz Apparatus in The Emergence of Unsaturated Soil <br />Mechanics," 1999, NRC Research Press, Canada. The Grand Junction Lincoln DeYore. testing DID <br />NOT utilize the special shear box The lowest normal stress of the strength test tends to "break" the soft <br />rock cementation (ultimate strength), with subsequent tests tending to measure softened peak and resid- <br />ual strreugth values. <br />We hope this letter has provided you with the information required. If questions arise, or if further <br />information is needed, please feel free to contact Grand Junction Lincoln DeVore at any time. <br />Respectfully submitted, <br />GRAND JUNCTION <br />LINCOLN DeVORE, INC. <br />30590 <br />:t-~9.~r <br />by: Edward iGi. Morris, P.E. <br />Principal Engineer <br />GJLD Job #92737-GJ <br />Ys J <br />PR-3 A14-83 (New 01107) <br />