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1100318 R0T0 0811 JRW1 46 <br />7 Analysis of the Cause of Post-December 2, 2008 <br />Pikeview Landslide Movements <br />Two major episodes of post-December 2, 2008 Pikeview Landslide movement are considered. <br />The first is the major episode of slope movement that occurred on September 6, 2009.68 The <br />second is the movement that occurred at the north end of the Pikeview Landslide and formed the <br />conspicuous north graben feature (Photograph 17). These two episodes of slope movement <br />were caused by the removal of lateral support that resulted from the Pikeview Landslide <br />movement and the presence of the heretofore unknown weak clay layer. The Pikeview <br />Landslide movement occurred on a continuous clay layer that removed sub-adjacent support <br />from neighboring portions of the slope. The major episodes of post-December 2, 2008 slope <br />movement also occurred on this clay bed and in a similar mode (translational slide) to the larger, <br />enveloping Pikeview Landslide. <br /> <br />68 State of Colorado, Colorado Geological Survey, CGS Assessment of New September 2009 Rock Slide at the <br />Pikeview Quarry, November 2, 2009 (Appendix 53)