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The lining system for the northern portion of WMU FU-06 incorporates the interim final cover for the <br /> former Austin Road Landfill. It consists of (from bottom to top): a two-foot foundation layer <br /> compacted to a minimum 90 percent relative compaction, a one-foot thick clay liner, and a one-foot <br /> thick vegetative layer. The overlying WMU FU-06 LCRS consists of(from bottom to top): an B- <br /> ounce nonwoven geotextile, a 0.5-foot thick layer of granular drainage material, another 8 ounce <br /> nonwoven geotextile, and a 1-foot thick protective operations layer. <br /> Material properties used in the stability analyses were based on actual test data from previous WMUs <br /> constructed at the site and a review of published values in the literature. The clay liner in the interim <br /> final cover was considered to be the weakest plane in the lining and LCRS system. Although the <br /> vegetative layer and protective operations layer are constructed at approximately 85 percent <br /> compaction rather than the 90 percent compaction of the clay liner, the materials used in the <br /> construction of the protective operations layer and vegetative layer are slightly sandier and would <br /> have a similar or higher shear strength than the clay liner. The granular drainage material, even in <br /> contact with the nonwoven geotextile,will also have a higher shear strength than the clay liner. <br /> Although there is not existing shear strength information on the clay liner material alone, it was <br /> conservatively assumed that the clay liner had a similar shear strength to the HDPE <br /> geomembrane/clay liner interface shear tests previously conducted at the site. Interface shear strength <br /> laboratory testing was performed for the construction of the WMUs D-95, D-97, D-98, D-99, D-00, <br /> D-01, D-02, FU-03,FU-04, and FU-05 lining systems(CH2M HILL 1995b and 1997c,Vector 1999a <br /> and 1999b, EMCON/OWT 2000, Holdredge and Kull 2001, Vector 2002,Vector 2003, Vector 2004, <br /> Vector 2005).Table 3-1 presents the assumed material properties used in the stability analysis. <br /> WMU FU-06 REPORT 3-5 <br />