The “Diemerzeedijk” is a dike between Amsterdam and Muiden.
In 1998 the clean-up of the refuse dump started. It was ended in 2001.
The polluted area is isolated by 26 m. deep screens, that rest on a clay layer.
On top of the screens rest a few impermeable top layers.
The groundwatertable in the isolated area is lower then in the area around, so that dirty water can not leak out.
Gasses and dirty groundwater are diverted by pumps and cleaned.
A network of regulating and measuring systems is monitoring the groundwater, gasses and the cleaning system.
In 2001, the realization of a town park on top of the former refuse dump is started.
On top of the isolated area, there are a few restrictions for plant growth.
There is a limited soil layer and no normal groundwater.
Therefore, on this area only grasses, herbs and small trees and shrubs can grow.
The park consists of nature, sport facilities, playgrounds, walking and bicycle paths.