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2016, Boskalis EOD Services (UK) Ltd., Walney Extension Offshore Wind Farm, ROV Inspection Campaign

2016, Boskalis EOD Services (UK) Ltd., Walney Extension Offshore Wind Farm, ROV Inspection Campaign

Topic categories:

Geophysical

Last series update:

May 2021

MEDIN approved

Industry:

Wind

Collection date:

Aug 2016 - Sep 2016

Development:

Walney Extension

Publication date:

May 2021

Round:

1&2 Extensions

Organisation:

Boskalis EOD Services (UK) Ltd.

Phase:

Pre-construction

Description

Acoustic and magnetometer survey of all planned cable routes and WTG location, etc. has been undertaken by Fugro EMU in Spring 2016.
Based on this survey, a number of ferromagnetic and acoustic contacts has been identified at discrete locations which may be EO and could impede wind farm component installation and therefore had to be inspected visually to confirm their identity. Some of the ferromagnetic contacts are expected to be buried by marine sediment and required seabed excavation.
By positive identification of EO confirmation, it shall be recovered or disposed of in accordance with existing UK authority regulations or any requirements imposed by authority in the specific case.
The respective cable routes initially revealed 50 ferromagnetic anomalies, which needed to be further investigated. Those 50 ferromagnetic anomalies were spliced up in two different lots. 45 ferromagnetic anomalies were in Lot 1, with a water depth > 10 m LAT and 5 ferromagnetic anomalies were in Lot 2, with a water depth < 10 m LAT.
Subsequently, Boskalis EOD Services (UK) Ltd. (subsidiary of HH EOD Services GmbH) was contracted by DONG Energy (UK) Ltd. for an inspection survey and optional clearance campaign on these pre-defined suspect target locations within these areas using an ROV.
Additionally, secondary objectives to be conducted were:
Virgin Survey of 14 separate areas, a Mag Mask Survey of 2 areas and a Depth of Burial (DoB) survey of third party asset crossings of 22 crossings.
The above phases of this short campaign were all executed by the vessel “Smit Kamara” from the 3rd of August 2016 to the 30th of September 2016.