18.6.2.6 Impact 6: Disruption to Ministry of Defence Activities 103. As no known naval activities overlap with the proposed East Anglia THREE project, the project is unlikely to cause any change to the baseline and therefore no impact is predicted.
18.6.2.7 Impact 7: Disturbance of Unexploded Ordnance 104. During operation, the number of vessels visiting the site would be significantly reduced from that seen during construction; therefore a negligible risk to disturbance of UXO is predicted. The mitigation measures described in the construction phases and in section 18.3.3 will be enforced during routine visits on all operational vessels.
18.6.3 Potential Impacts during Decommissioning 105. During decommissioning, the majority of impacts identified during the construction phase are applicable. There is likely to be an increased level of vessel activity associated with the removal of structures. Similar to the majority of the construction impacts, there is limited source for the potential impact on other human activities given the lack of spatial overlap, where this is the case no impacts are predicted.
18.6.3.1 Impact 1: Interference and Damage to Sub-sea Cables and Pipelines 106. To minimise environmental impacts, the offshore cables and inter-array cables may be disconnected and left in-situ. However, should the cabling be removed then there is a likelihood for further disruption to sub-sea cables and pipelines, similar to those detailed for the construction phase. Consequently, in line with that detailed in section 18.6.1.3, the sensitivity of the receptor is considered to be high and assuming the cable crossing agreements remain in place, the magnitude is negligible. The impact is therefore considered to be ofminor adverse significance.
18.6.3.2 Impact 2: Disturbance of unexploded ordnance 107. The decommissioning of the proposed East Anglia THREE project will see an increased level of vessel activity (from that experienced during operation) associated with the removal of all structures. Therefore, the chance of disturbing UXO will be increased. Mitigation measures detailed for construction impact 7 (section 18.6.1.7) will be implemented reducing the risk. With such mitigation in place the residual risk of disturbance to UXO will be low.
18.7 Cumulative Impacts 108. The predicted impacts of East Anglia THREE to infrastructure and other users are:
Effects on other UK and European windfarm developments;
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 18 Infrastructure and other users Page 32
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