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3,2 Stability Analysis The stability analyses are based on several measured and assumed material properties. The material properties used in the analyses and the results of the analyses are presented below. Calculations are included in Appendix B. 3.2.1 Material Properties The single-composite lining system for the WMU FU-13 base will consist of a 2-foot thick clay liner overlain by a double-sided textured HDPE geomembrane, cushion geotextile, and granular blanket LCRS. The liner on the northern and western slopes will consist of a geosynthetic clay liner(GCL) overlain by a single-sided textured HDPE geomembrane and a geocomposite drainage net (GDN). The GDN will have a nonwoven geotextile bonded to one side of the geonet. The geonet side will be placed against the smooth side of the HDPE geomembrane. Material properties for use in the stability analyses were based on actual test data from previous WMUs constructed at the site and a review of published values in the literature. Table 3-1 presents the assumed material properties used in the stability analysis. The interface shear strength for the base lining system of WMU FU-13 was estimated using laboratory testing performed for the construction of the WMUs D-95, D-97, D-98, D-99, D-00, D-01, D-02, FU-03, FU-04, FU-05, FU-06, FU-08, and FU-10 lining systems (CH2M HILL 1995b and 1997c, Vector 1999a and 1999b, EMCON/OWT 2000, Holdredge and Kull 2001, Vector 2002, Vector 2003, Vector 2004, Vector 2005, Vector 2006, Vector 2008, Vector 2010). These interface shear strength results were assumed to be representative of those in WMU FU-13 because WMU FU- • 13 will be constructed using onsite soils and geosynthetic materials very similar to those used in these previously constructed WMUs. The interface shear strength properties used for the side slope liners were estimated using laboratory testing performed for the construction of WMUs D-97, D-98, D-00, D-01, D-02, FU-03, FU-04, FU- 05, FU-06, FU-08, and FU-10 (CH2M HILL 1997c, Vector 1999a, EMCON/OWT 2000, Holdredge and Kull 2001, Vector 2002, Vector 2003, Vector 2004, Vector 2005, Vector 2006, Vector 2008, Vector 2010). These interface shear strength results were assumed to be representative of those in WMU FU-13 because the same combination of materials was used in these previously constructed WMUs. Table 3-1 presents the assumed material properties used in the stability analysis. WMU FU-13 REPORT.DOC 3-2