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Over the last decade, the performance of landfill liners built over yielding foundations has been well documented. Strain measurement systems and leachate collection systems indicate that a layer of uniaxial geogrid has supported the structural components of landfills constructed over challenging subgrades. The characterization and model for the foundation is the most important component of the design. Experience and precedence need to be combined with a site specific analysis when setting the parameters for a foundation comprised of municipal solid waste. The design objective is focused on limiting the strain in the liner system and soil arching and tension membrane theories are the back- bone of the design procedure. This paper discussed these issues and presented a design solution and example problem. 10.0 References Bertin, Y. (1978), "A Centrifuge Study of the Collapse of Hemispherical Cavities in Soil", er's Thesis, University of Florida, 122 pp. Bonaparte, R. "Overview of Landfill Construction on Unstable Subgrades and Innovative Landfill Closure Considerations", Pr ings. Advanced % fiO u Design, Construction and Closure aeminar. 2nd Edition, Albany, New York, Aug., 1990. Bonparte, R. and Berg, R. R., The Use of Polymer Geosynthetics to Support Roadways Over Sinkhole Prone , P_rQgg4in&L Second MultidijdplinAa Co erence on ;Si m and the En3ftmnental Impacts ofKarsts. Orlando, Fl., Feb 1987, pp. 437-445. Bowles, J. E., "Foundation sis and Design", McGraw-Hill, Inc., New York, NY, 1982, 816 p. "Creep Behavior and Long -Term Design Load of C�eog�ds', Geosynthetic Research Institute (GRI), GRI Test Method GG3-87, 1987, 18 p. "Resign of Tensac Geogrid Reinforcement to Support Landfill Lining and Cover Systems' Tensar Technical Note: WM3. The Tensar Corporation, Morrow, GA., May 1989. Giroud, J. P., "Designing with Geotextiles", Materiaux et Constructions, Vol. 14, No. 82, (Jul -Aug 1981), pp 257-272. (15)