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Northwest Wall 151 °/35° <br />N <br />W <br />S <br />Equal Area <br />Lower Hemisphere <br />Friction Angle 33" <br />Expanation: <br />Trend and Plunge of Plane Intersection Inside Envelope <br />Trend and Plunge of Plane Intersection Outside Envelop <br />Wall Orientation <br />Planes of Discontinuity Sets <br />Variation in Dip of Foliation F-1 <br />Friction Angle <br />Dayliqht 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 FELICE <br />& Associates <br />Stereonet Plot Northwest Wall <br />LAFARGE Figure 13 <br />N(1Ni11 ANSI I'll n