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<br /> <br />• <br />• The 1997 condition when pins and dewatering measures were not in place, and using groundwater <br />conditions from November of 1997. Figure H8 shows stability under these conditions. <br />• The 1998 condition when pins were in place and dewatering measures were not, and using the <br />groundwater conditions from November of 1997. Figure H9 shows stability under these conditions. <br />• The 1999 condition when pins, horizontal trenches and othe dewatering measures were in place, and <br />using groundwater conditions from June of 1999. Figure H1O shows stability under these conditions. <br />Factor of safety results of the modeling, can be summarized as follows: <br />• 1997 Condition: Factor ofSafety = 1.04 <br />• 1998 Condition: Factor of Safety = 1.28 <br />• 1999 Condition: Factor of Safety = 1.33 <br />Results for 1997 and 1998 conditions differ slightly from those reported in previous years due to the use of <br />new and improved computer algorithms. <br />The stability analysis indicates an increase in stability of 23% with pins installed and water table at the <br />1997 conditions, and 28% with dewatering measures in place and water table lowered to the 1999 <br />conditions. <br />4.3 Pin (Micro-Pile Analyses) <br />See the "1997/98 Landslide Corrective Measures Report" for a discussion on micro pile analysis. The <br />model predicted a displacement of 1.8 feet. Actua] displacement to date is 1 inch. <br />4.4 RCC Buttress <br />See the ` 1997/98 Landslide Corrective Measures Report" for a discussion on RCC buttress analysis. <br />Barr Engineering Company <br />PCDOCS1206220/CAK <br />July 37,1999 <br />15 Appendix H <br />1999 Addendum to <br />1997198 Landslide Corrective Measures Report <br />