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M93040GE <br />i <br />I <br />t <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 <br />(HORIZONTAL TO VERTICAL) <br />Wet Slope Well Drained Slope <br />Material Material <br />CALCULATED THEORETICAL <br />FACTOR OF SAFETY <br />1.2 <br />1.3 <br />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 />2.25 1.5 <br />2.5 1.75 <br />2.75 2.0 <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 aila .:~sso~iate.s <br />DONSULiwD OEO ~E C~NiUt ENGINEERS •ND <br />MI IE RILL 1E SiING <br />