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i <br /> harmless levels. = <br /> The example anal is presented in this paper: demonstrates that placing controlled fill (c-= <br /> lys p resente <br /> or waste) above an existing landfill is a viable and ecaao.micai method to protect a r..� <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 /> ACKNOWLEDGEME; TS <br /> The authors would like to thank the staff of Waste Management of North America, Inc. for <br /> providing the opportunity and the'mea is to peifoFrn this study. Also,-the�suthors would like to <br /> thank'Kuantsai Lee and Leo Overmann of Golder---Associates for-their support-and for the time <br /> they provided to review this paper. <br /> i <br /> 1508-Vancouver.Canada-.Geosynthodr-s'93 <br />