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AXOM <br />Henderson 3 Dam Buttress Design <br />January 26, 2018 <br />Page 7 <br />Mode! Geometry <br />Model geometry was developed using pre -construction (1974) topography and current topography <br />Internal geometry, including coarse and fine tailings, as well as foundation material, was developed <br />by reviewing 21) cross sections, available CPTs and drill logs, depositional history and using <br />engineering judgment. <br />Figure 8 and 9 provide the developed 31) model geometry of 3 Dam with Stage 1 buttress when crest <br />is at elevation 8,883 ft. Figure 10 shows the developed 3D phreatic surface of the model for Stage 1 <br />buttress. Similar figures are provided for the final stage buttress with crest elevation of 8,900 ft and <br />presented on Figures 11 through 13. <br />Materia! ProDertie5 <br />Soil properties used in the 3D factor of safety analyses were as follows: <br />1. Total unit weight <br />2. Shear stiffness parameters <br />3. Undrained shear strength and residual shear strength <br />Table 2 summarizes the material properties used in the factor of safety analyses. <br />M.1DO8iPROJEOT8WiRR�40651�� HENT_ B SON_ 3 OM BUTT M WZGN LETTER REPORT REV B_ FINhL0OC7C <br />