An experimental papermill sludge landfill was constructed and monitored to obtain engineering information essential to the development of guidelines and recommendations for the design and operation of solid papermill waste landfills. The experimental landfill consisted of two sludge layers, with sand drainage blankets, an earth dike for lateral confinement and a natural soil cover. The landfill was instrumented for settlement, water pressure, vertical and lateral earth pressure, temperature, sludge unit weights, specific gravity, and water contents. Laboratory work was also conducted. A detailed description of the field behavior is given in the report along with predictions based on laboratory results and soil mechanics theory. Sampling of leachate from the sludge landfill at weekly intervals and laboratory analysis according to standard methods for the examination of water and waste water provided documentation as to leachate composition. A lysimeter study provides information on changes in quality of the leachate when passed through selected natural soils.