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• watershed areas aze the primary sources of water in the landslide. <br />The piezometer data indicates that the landslide is water driven, with the source being snowmelt and <br />rainfall directly on the slide and from land above the slide that naturally drains into the slide area. In the <br />past, the slide has not been able to remove this water efficiently, resulting in groundwater mounding at the <br />head of the slide. Methods have been implemented, including horizontal trenches, stone columns, pond <br />lining and ditch lining, to intercept snow melt and rainfall and increase the efficiency of outlets in the slide, <br />resulting in stabilization and reductions in movement. <br />• <br />• Barr Engineering Company July 31, 1999 <br />PCDOCS1209220/CAK 8 Appendix H <br />1999 Addendum to <br />'1997FJ8 Landslide Cortective Measures Raporl <br />