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Norfolk Boreas OWF - CPT Rods on/in Seabed

Fugro had completed a geophysical, geotechnical and environmental survey in 2017 at the Norfolk Boreas Offshore Wind Farm. During the course of those survey works, CPT rods had been left on/in the seabed at three borehole locations.

Recovery works were recently undertaken in an attempt to recover the rods from two of the locations where the rod was either on or within 1m of the seabed. During those recovery works only a portion of the rod was recovered and there are some rods remaining at the site. While the rods are laying flat on or 1m below the seabed, there is a potential hazard to fishing equipment trawling the seabed at these locations.

CPT rod of different lengths is found at the following coordinates at the site:

Location/Object

Location

Water depth (m)

Rods lost (m)

Comment

NB-CPT027

53°00.731'N 002°49.159'E

38.4

21.36

>1m below seabed level

NB-CPT030 CPT

53°03.298'N 002°48.534'E

36.2

22.3

>11.0m below seabed level

NB-CPT031a CPT North End

53°03.726'N 002°51.058'E

26.9

28

Laying Flat on seabed

NB-CPT031a CPT South End

53°03.720'N 002°51.056'E

26.9

28

Laying Flat on seabed

 

For further information:Joseph Hine, Senior Geophysicist, Vattenfall, Tel: +44(0)776 644 293  email: joseph.hine@vattenfall.com

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