Landscaping at Forssa landfill
Our environmental construction professionals are working hard on an old landfill in Forssa, Finland. In two years, the blackish mountain of waste will be replaced by a beautiful green hill.
The Viksberg landfill in Forssa was closed already in the mid-1990s. The cleaning and protection of the 20-hectare landfill site started in November 2016 and is due for completion in late 2019. Lemminkäinen is carrying out the project.
The massive earthmoving and land improvement project will completely transform the entire area, not only the scenery but also the soil. Contaminated soil moved from the fringes of the landfill is treated with fly ash delivered from incineration plants. When ready, the grass-covered hill will be approximately ten metres high.
Swampland is posing challenges
In addition to earthmoving, we will underdrain the entire landfill site and build protective embankments around it. We will cover ash-treated land masses with a bentonite carpet, which in turn will be covered with a layer of soil for light landscaping. This ensures that rain or drainage water will not release any harmful substances from the landfill soil into the surroundings.
The project is further complicated by the swampy ground, which also restricts the thickness of the topmost soil layer. If there is too much weight, the whole mass may start moving.
Gases brewing up in Viksberg's soil are collected, analysed and utilised as a source of energy, for instance. Gas collection wells and pipe systems are part of our refurbishment contract.
The future use of the area is still being planned. It's likely that it will be a sports and recreation area as the unstable ground won't support building construction.