The decision by the Uusimaa Regional Environment Centre to stop the dredging work for the Vuosaari Harbour project is not expected to delay the construction of the of the harbour.
The Port of Helsinki and the Environment Centre are working together to assess questions related to the dredging of the sea bottom, which has been found to contain large amounts of tri-butyl tin, a toxic chemical used in certain paints.
Tri-butyl tin is used in paints on the hulls of ships. At the nearby Vuosaari shipyard, ships coming in for repairs have often been stripped of their paint before repainting, and chips of the old paint have washed out to sea and collected on the bottom nearby.
The dredging has been suspended pending agreement on how to deal with the toxic mud on the bottom.
YLE24, Finnish News Agency