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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />TABLE 1.0 <br />BEDROCK SHEAR PROPERTIES <br />Bedrock Average Unconfined <br />Material Compressive Strength <br />Shale 235 psi <br />Sandstone 5230 psi <br />Siltstone 9550 psi <br />Coal 5686 psi <br />Slope Stability <br />Shear Strength <br />=22 ;c=2500 psf <br />=40 ;c=5000 psf <br />=31 ;c=5000 psf <br />=31 ;c=5000 psf <br />