Full-scale landfill bottom liner test structures at the Ämmässuo Landfill, Espoo

Full scale tests structures were constructed in summer 1996 in the Ämmässuo landfill, Espoo, Finland, to gather experience on quality control during the construction and long-term behaviour of mineral liners and combination liners. Actual leachate was used to create the chemical loading and a hydraulic pressure of one meter. The structures were monitored for two years. The leachate seeping through the liner structures was collected in lysimeter basins and additionally in lysimeter wells, in which the amount of the water was measured automatically by pressure sensors and water samples taken for chemical analyses. The structures
were dismantled under controlled conditions in November 1998, and material samples were taken to evaluate the effects of leachate.