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W <br />Equal Area <br />Lower Hemisphere <br />Friction Angle 330 <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 />E <br />Note: There is a potential for instability <br />when intersection of great circles representing <br />planes fall within the shaded region. <br />LACHEL "UCE <br />& Associates <br />G eoF cnnics, Foudat-s, G cdeigmwd Stm mms <br />Stereonet Plot: Northwest Wall <br />,FLAFARGE I Figure 12 <br />NORTH AMERICA <br />Northwest Wall 151 °/35° <br />N