In 2015 Wasa Dredging was awarded the contract of deepening the fairway into Oslo, the capital city of Norway. The client for the project was Kystverket. The work was to be executed in four different municipalities: Oslo, Baerum, Nesodden and Frogn, along the entirety of the fairway into Oslo. The scope of work contained of about 89 000 m3 of rock that was blasted, dredged and transported by barge. The amount of transported blasted bedrock measured up to around 350 000 m3. Due to a lot of constructions in the fairway Wasa had to plan and execute most of the blasting as careful blasting with vibration requirements.
The blasting and dredging of the masses was handled by combined drilling platform/backhoe dredger “Hector” and the bedrock was transported over a distance of up to 20 km by the two 940 m3 split-hopper barges “Miika II” and “Dana II”.
The project also consisted of environmental dredging. For this scope backhoe dredger “Optimus” alongside with 700 m3 split-hopper barges “Jenna”&”Laura” were mobilized. The environmental scope consisted of around 19 800 tonnage tha was taken to special reclamation sites and significant measures were implemented to protect the environment and the marine life.
The works were executed in the period between October 2015 and May 2016 and the total value of the project was around 155 million Norwegian krones.
Careful blasting: 89 000 m3 sito
Dredging and transporting blasted rock: 350 000 m3
Environmental dredging: 19 800 tonnes of material
In the end of July 2018 a joint venture consisting of Wasa Dredging and Van Oord Marine Contractors signed two separate contracts regarding a big project in Kokkola Harbour and Fairway.