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M93040GE ~ • <br />3.1 Slope Configuration <br />Our analysis of the slope was based on the assumed strength <br />characteristics noted above of the soils anticipated to be <br />encountered in the slopes with a wet slope condition and a drained <br />slope condition. The results of our slope stability analysis based <br />on a wet slope condition and a drained slope condition with slope <br />inclination and calculated theoretical factor of safety are <br />tabulated below. <br />SLOPE INCLINATION CALCULATED THEORETICAL <br />(HORIZONTAL TO VERTICALI FACTOR OF SAFETY <br />Wet Slope Well Drained Slope <br />Material Material <br />2.25 1.5 1.2 <br />2.5 1.75 1.3 <br />2.75 2.0 1.4 <br />3.0 2.25 1.5 <br />Soil logs of subsurface bore holes located in the area of the <br />portal prior to portal construction were also used as indicators of <br />the anticipated subsurface conditions located on the cu*_ slope. <br />4.0 CONSTRUCTION CONSIDERATIONS <br />We suggest that the existing slopes above the bench be <br />flattened to an inclination with an appropriate factor of safety. <br />We understand that you may choose a slope with a factor of safety <br />less than 1.5. A calculated theoretical factor of safety of 1.5 is <br />generally considered by the geotechnical engineering community as <br />4 <br />Lambert ana ~ssociate,s <br />CONSULiwG GEO lECnwOPL EN GIrv EERS •ND <br />M~lE RIPL iESiING <br />