The DOP250’s Boskalis’ design suction pipe is equipped with high pressure jets, loosening the soil. Thus, a hole is created in the top soil layer.
Along the waterfront in Harderwijk, an old town in the centre of The Netherlands, a new residential area is to be built. The site was formerly used as industrial area, which has resulted in a polluted top layer of the soil. To avoid handling this polluted material, Boskalis used an innovative and challenging method: a DOP250 was used to mine clean sand from deeper down, and cover the polluted layer - which remained in place.