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harmless levels. w. <br /> The example analysis presented in this paper demonstrates that placing controlled fill(r <br /> or waste) above an existing landfill is a viable and econotnicai method to protect a T. <br /> reinforced liner system from the impact of potential excessive differential sett'_ement. This is <br /> of particular importance because vertical expansions are often in the design phase while the <br /> existing landfill is still operating. This provides the opportunity to select the waste placed in the <br /> upper zone of the existing landfill, such that large objects are not placed in the zone immediately <br /> below the base grades of the vertical expansion liner system. <br /> ACKNOVaXDGM"EN'TS <br /> The authors would like to thank the staff of Waste Management of North America, inc. for <br /> providing the opportunity and the""means to pcifonn this study. Also, the authors would Like to <br /> thaxk'Kuantsai Lee and L.eo Overmann of Golder=Associates for'-their support-and.for the time <br /> they provided to review this paper. <br /> 1508- Vancouver.Canada-.Geosynthefics'93 <br />