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W <br />Equal Area <br />Lower Hemisphere <br />Friction Angle 33° <br />Expanation: <br />Trend and Plunge of Plane Intersection <br />~ Wall Orientation <br />~ Planes of Discontinuity Sets <br />Variation in Dip of Foliation <br />Friction Angle <br />Note: There is a potential for instability <br />when intersection of great circles representing <br />planes fall within the shaded region. <br />LACHEL Sly <br />GeereeFnim H UnEeryrmntl 54u<lurea <br />Stereonet Plot: Northwest Wall <br />~i.wFnncs Figure 12 <br />NORrN 11MEMG <br />Northwest Wall 151°/35° <br />N <br />