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su. m 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", M is Thesis, University of Florida, 122 pp. Bonaparte, R. "Overview of Landfill Construction on Unstable Subgrades and Innovative Landfill Closure Considerations", PEQg0dingL Advanced LAWfiU Design.C.onstruction and Closure Semirr. 2nd Edition, Albany, New York, Aug., 1990. "The Use of Polymer Geos Bonparte, R. and Berg, R. R., y ynthetics to Support Roadways Over Sinkhole Prone Areas", Prc i gL on Multidisciniinary Co erence on Sinkholes the EavironmantallWactl of K s Orlando, Fl., Feb 1987, pp. 437-445. Bowles, 1. E., "Foundation Analysis and Desian", McGraw-Hill, Inc., New York, NY, 1982, 816 p. "Creey Behavior and Lona-Term Desitin Load of rids", Geosynthetic Research Institute(GRI), GRI Test Method GG3-87, 1987, 18 p. "Design of Tensar Geogrid Reinforcement to Support Landfill Lining and Cover Systems" Tens r Technical Note: WM3. The Tensar Corporation, Morrow, GA.,May 1989. Giroud, J. P., "Designing with Geotextiles", Mate Jaux et Constructions, Vol. 14, No. 82, (Jul-Aug 1981), pp 257-272. (15)