Business Presentation Den Ouden Groep 03-2018

2. What do we offer?
References
Historical research UXO transport systems
and sewer pumping stations north
Client:
Kragten
Implementation period: 2017
Nordstream 2: PUXO 2X submarine pipelines
and onshore facilities - Baltic Sea
Client:
NSea
Implementation period: 2017
The historical research for the Transport Systems and
Sewer Pumping Stations North project involved five subareas
in the Betuwe, where Waterschap Rivierenland will
carry out work on a number of sewage treatment plants.
The total length of the grids is 20 km.
The historical research focused on the extent to which the
project area was involved in war operations in the 1940-
1945 period. The Betuwe was one of the most affected
areas during World War II. Ochten, Opheusden, and Zetten,
among other places, were so heavily damaged that after
the liberation, residents had to wait several months before
they could return. The Betuwe was on the front line from
September 1944 until the end of the war in May 1945.
In addition to these war operations, the Betuwe was also
under water for a long time: the Germans blew up the
Rijndijk in early December 1944, which flooded the area
between Tiel and Elst. The water not only drove Allied and
German troops out of the area, but also erased many war
traces such as craters. This made it difficult to interpret
the aerial photographs from 1945.
The Nordstream 2 project consists of two undersea
pipelines with a diameter of 1,20 meters. The pipelines
and attached onshore facilities cross through most of the
Baltic Sea, from the Russian coast to the German coast.
Throughout history the Baltic Sea has been the theatre of
naval warfare. As a result of this fighting, many remnants
of unexploaded ordnance (UXO) are still present in the
seabed. Examples are mines, bombs from airplanes and
torpedo’s. There are also several dump sites for munitions
present in the Baltic Sea. One of these, near the island
Bornholm, was used as a dumping ground for both regular
and chemical munitions. These historical events, as well
as present day military practice areas, make it necessary
to conduct UXO surveys in the Baltic Sea. BODAC scanned
the seabed with multibeam echo sonar (MBES), side-scan
sonar (SSS), magnetometer and gradiometer equipment.
The data was then analysed to provide a clear picture of
unexploaded ordnance still present in the seabed. When
necessary BODAC removed dangerous objects along the
sea-corridor.
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