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Table 1 <br />• Geotechnical Parameters for <br />Limit Equilibrium Stability Analyses and Groundwater Analyses <br /> Shear Strength <br /> <br />Material Name Permeability <br />fUsec. Unit Weight <br />Ib/ft I Cohesion <br />b/ftZ Friction Angle, PJ <br />Degrees <br />Colluvium' 1.7 x 10"' 130 200 13.1 <br />Interbedded Weak Rock at Toe of <br />Slope 2.1 x 10° 140 5,000 35 <br />Interbedded Rock at Head of Slope 4.0 x 10' 140 5,000 35 <br />Granitic Cobbles 1.8 x 10-3 130 0 35 <br />Massive Sandstone 2.8 x 10-' 140 10,000 45 <br />Coal 2.4 x 10` - - - <br />Gravel Strings 2.4 x 10.3 - - - <br />' Shear strength of colluvium is the shear strength at the shear plane as measured in situ by the borehole shear test <br />(BHST). The geotechnical parameters for other materials are based upon the physical properties, testing and <br />• literature. <br />Geotechnical Parameters of <br />Colluvium for FLAC Model Analyses <br />Properties Upper Colluvium Lower Colluvium Failure Plane <br />Cohesion (psf) 200 500 0 <br />Friction (deg.) 13.1 22 6.5' <br />Density (psf) 130 130 NA <br />Bulk Modulus (psi) 3625 10875 4SA <br />Shear Modulus (psi) 610 1827 NA <br />Shear strength at failure plane was established in the modeling where the upper colluvium becomes unstable and <br />begins to slide. This shear strength incorporates existing hydrostatic pressures into the analyses. <br />• <br />0626019 \58915-1/LA13 <br />