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harmless levels. <br /> The example analysis presented in this paper demonstrates that placing controlled fill (s-- <br /> or waste) above an existing land -I is a viable and economical 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 /> ACSNOWLEDG S <br /> The authors would like to thank the staff of Waste Management of Borth America, Ind. for <br /> providing the opportunity and the paeans to pciform this study. Also,=the=authors would like to <br /> thankk-Kuantsai Lee and Leo Overmann of Golder-Associates for their supp ft-and for the time <br /> they provided to review ;this paper. <br /> 1508- Vancouver.Canada-.Geosyntheries'93 <br />