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J5.0 Summary of Selected Monitoring Information <br />• <br />• <br />This section is an update of Section 5.0 of the "1997/98 Landslide Corrective Measures Report". This <br />section provides new results on landslide monitoring gathered to November of 2001. <br />J5.1 Surface Monitoring Points <br />Complete historic cumulative movement of landslide movement monitoring points is provided in <br />Appendix Jl. Locations of all landslide movement monitoring points are shown on Figure Il of the 2000 <br />Addendum. Figure J1 shows a few selected monitoring points, illustrating the trend in movements during <br />the spring and summer seasons. Before 1999, increased rates of movement could be seen t~ occur during <br />spring seasons. However, under present conditions the slide exhibits rates of either no to extremely slow <br />movement during the year. <br />Landslide movement can be classified in accordance with the Landslide Velocity Classification presented <br />in Appendix A of the 1997/98 report. From a period between October 2000 to November 2001, the <br />current average rate of surface movement measured by the mirrors was approximately 0 to 6 mm/year <br />(0.23 inches/yeaz). >n the previous period between July 1999 to September 2000, the average rate of <br />surface movement measured by the mirrors was approximately 0 to 6 mm/year (0.25 inches/year). This <br />classifies the landslide a[ the lower end of Landslide Velocity Class 1 (low LVC-1 ). <br />For the Spring of 2001 landslide season, there was no measurable movement of the slide. This classifies <br />the landslide as an suspended slide. For a period covering landslide seasons during the Spring of 1998 and <br />the Spring of 1999, the rate of surface movement was 23 mm/year (0.9 inches per year) a[ the tce, and 306 <br />mm/year (12 inches/year) at the head. This classified the landslide at the lower end of Landslide Velocity <br />Class 2 (low LVC-2) at the tce and slower-middle LVC-2 at the head. This compared to values reported <br />in 1998 for movement to April 1998, when an average rate of movement of 56 mm/year (2.2 inches/year, <br />low LVC-2) at the tce and l I12 mm/year (44 inches/year, high LVC-2) a[ the head was measured. <br />Overall, the landslide movement has stopped and the landslide can be classified as suspended, with <br />permanent swctures highly likely to remain undamaged. <br />Barr Enpineerlnp Company <br />PCDOCS1230503/CAK <br />December 15, 2000 <br />Appendix J <br />2001 Addendum to <br />1997N9 Landslide Corrective Measures Report <br />