Metsäsairila was selected as a municipal solid waste (MSW) landfill under more detailed investigation in Finland. It is located in the South-Eastern region in Finland, more precisely at City of Mikkeli. It has both active and old, closed parts and it has been operating since the beginning of 1970´s. The surface area of closed landfill area is around 8 hectares and currently active area around 3 hectares.
Sampling holes were drilled in Metsäsairila landfill and aggregate waste samples were collected by shovel. Samples were sorted manually by sieves to size fractions of >100 mm, 20-100 mm and <20 mm. Fractions consisted mainly from fine material (<20mm), energy fraction (plastic, paper, wood, cardboard), soil, metals and others. Fine material consists mainly of landfilled wastes but also of the landfill cover materials (usually soil). In Metsäsairila study case fine fraction varied from 37 % to 47 % depending on the sampling well (totally five wells were drilled in closed and active landfill areas). Distribution of sorted waste fractions
is shown in Figures 1 and 2.