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maintained and tensile strain in the lining system will be limited to less than 1 percent. Both the <br /> geomembrane and GCL components of the lining system have yield strains greater than 10 percent <br /> and are,therefore, flexible enough to withstand this conservatively calculated tensile strain. <br /> According to site operations personnel,I the former Austin Road Landfill waste slopes have an <br /> existing interim cover that is approximately 2 to 3-ft thick. In addition, it is unlikely that refuse that <br /> would create a large void (i.e. rusted refrigerator) would be placed within 3-ft of the former Austin <br /> Road Landfill final cover slopes. Therefore, to provide a lining-to-collapse separation of 5.5-ft and <br /> given that at least 3-ft of separation already exists to any potential void and there is an approximate 2- <br /> ft thickness of existing soil cover, approximately 1-ft of additional compacted fill material will be <br /> placed on the former Austin Road Landfill slopes. The WMU FU-17 grading plan (Appendix A) <br /> was developed to provide the necessary additional compacted subgrade fill. The combination of the <br /> interim cover already in place and the additional compacted subgrade fill will provide the required <br /> compacted fill material thickness below the WMU FU-17 interface lining system. <br /> 2.4 Refuse Fill Grades <br /> Final waste grading plans are not included in this report. This information is available in the <br /> Preliminary Closure and Postclosure Maintenance Plan (BAS, 2002). The maximum waste fill slope <br /> during the filling of WMU FU-17 will be approximately 3:1, as presented in the slope stability <br /> analysis in Appendix B and discussed in Section 3 of this report. <br /> Based on information provided by Butch Stefan,former Site Manager at the Forward,Inc.Landfill. <br /> WMU FU-17 DESIGN REPORT 2-3 <br />