18.6.1.7 Impact 7: Disturbance of Unexploded Ordnance 87.
There are a high number of vessel wrecks in the vicinity of the proposed East Anglia THREE project which may contain UXO items. The majority of UXO items are likely to be located on the surface of the seabed, or partially buried. Furthermore data from an OSPAR (OSPAR 2010) report indicates the presence of a munitions dumpsite within the northern part of the East Anglia THREE site. This report identifies that this site has been used to dump conventional munitions however no further detail is provided in the report. Geophysical surveys (see Chapter 7 Marine Geology, Oceanography and Physical Processes) conducted by EATL have not found any evidence of this dumpsite, and it is not delineated on Charts 2182a –North Sea Southern Sheet, 1504 – Cromer to Orford Ness or 1503 – Outer Dowsing to Smith’s Knoll including Indefatigable Banks.
88. During construction, activities that interact with the seabed either directly (e.g. jack- up vessel) or via the placement of material such as foundations, run the risk of disturbing UXO, with potentially dangerous and damaging effects to both construction workers and equipment.
89.
Therefore, given the potential for UXO within the proposed East Anglia THREE project, the impact will be described as a risk, for which a ‘medium’ risk level is predicted.
90.
To reduce the risk of UXO disturbance to As Low as Reasonably Practical (ALARP), a number of mitigation measures are proposed within section 18.3.3, including pre- construction surveys (which will consider the munitions dump identified in the OSPAR report) and micro-siting of infrastructure to avoid known occurrences of UXO. Given these embedded mitigation measures the risk of disrupting UXO is considered to be low.
18.6.2 Potential Impacts during Operation
18.6.2.1 Impact 1: Impacts on other UK Windfarms 91.
Overlap of maintenance activities; Increased pressure on port facilities; Navigational safety issues; and
Aviation (i.e. helicopter) safety issues.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 18 Infrastructure and other users Page 29
Impacts to other windfarms during operation of East Anglia THREE could arise from the following:
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