Boskalis Nordic Today No. 02/2019-2020

PORT OF RAUMA, FINLAND | PETÄJÄS 4 EXPANSION PROJECT

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PORT OF RAUMA TO EXPAND BY SIX HECTARES

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TEXT & PHOTOS: MARKKU SALONEN, IMAGE 03: PORT OF RAUMA LTD I n October 2019, Port of Rauma Ltd launched Petäjäs 4, a project of con- siderable size, involving the expansion of harbour field facilities in the Ulko-Petäjäs area. The project is a continuation of earlier harbour field expansions. The expansion, now under way, is the fourth of its kind. In the Petäjäs 4 project, Terramare is implementing a six-hectare harbour ex- pansion. The approximately two year long contract includes both onshore and offshore construction. The expansion will be implemented by seaward rock-filling. The contract also includes dredging of contaminated soil and clay in the area as well as surface, drainage, illumination and landscaping work on the constructed and compacted rock-fill area. The expansion also will also require a fairway modifica- tion and sea marks.

EXTENSIVE DREDGING Initially, dredging of contaminated soil was carried out in the area, followed by dredg- ing of clay. Nearly 300,000 m 3 of clay will be removed from the area, down to a depth of 27 metres. Terramare’s powerful

dredging entering the surrounding water- way. The silt curtain is 700 metres long. The part of the curtain protected with an air bubble tube serves as a fairway for cargo and ferry vessels,” explains Terramare Site Manager Markku Pöyhönen .

PORT OF RAUMA LOCATION

“We started the expansion contract by protecting the site with silt and air bubble curtains, which prevent, for example, the temporary turbidity of water caused by

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BOSKALIS AREA NORDIC´S OPERATING PRINCIPLES ARE: WE DO WHAT WE PROMISE — RIGHT FIRST TIME — WORKING TOGETHER