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C <br />harmless levels. <br />The example analysis presented in this paper demonstrates that placing controlled fill <br />or waste) above an existing landfill is a viable and eeonornical method to protect a r.. <br />reinforced liner system from the impact of potential excessive differential ntt'- ease twh lels is <br />the <br />of particular importance because vertical expansions are often in the design p <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 />A.CKNOWLEDGEWENTS <br />The authors would like to thank the staff of Waste Management of NorthAmerica, Inc. for <br />providing. the opportunity and the`means to 0666 -and. this study. Also, thvauthors would like to <br />and. for the time <br />thank Kuantsai Lee and Leo Overmann of Golder�`Associates for their suppoit. <br />they provided to review this paper. _ <br />1508 - Vancouver. Canada-.GeosynthebCs'93 <br />