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<br /> <br /> <br />West Wall 091 °/45° <br />W <br />S <br />Equal Area <br />Lower Hemisphere <br />Friction Angle 330 <br />Note: There is a potential for instability <br />when intersection of great circles representing <br />planes fall within the shaded region. <br />Expanation: <br />--- Trend and Plunge of Plane Intersection <br />Wall Orientation <br />Planes of Discontinuity Sets <br />Variation in Dip of Foliation F-1 <br />-'-- Friction Angle <br />Daylight Envelope <br />LACHEL MCE <br />& Associates <br />G eotec r.is, Fourdatnrs, U ndexgmurd St-toms <br />Stereonet Plot: West Walls <br />l.AFARCAr= I Figure 13 <br />NORTH AMERICA