operators. Therefore, sensitivity and magnitude are considered to be negligible, leading to an impact of negligible significance.
18.6.1.3 Impact 3: Interference and Damage to Sub-sea Cables and Pipelines 75.
As detailed in sections 18.5.3 and 18.5.5, the offshore cable corridor would cross eight existing telecommunications cables, three electrical transmission cables from Greater Gabbard offshore windfarm, up to three export cables from the proposed Galloper offshore windfarm and the Bacton to Zeebrugge gas pipeline. Construction activities, such as offshore expert cable and inter-array cable installation, vessel anchoring and debris cleaning operations could interfere with the submarine cables and gas pipeline, which could disrupt telecommunication and energy networks.
76. Damage to offshore cables and pipelines caused during the installation of East Anglia THREE export cables would be expensive to repair and could cause disruption to power distribution and telecommunications, therefore the sensitivity of the receptor is high. However, cable and pipeline crossing agreements with operators would be put in place as embedded mitigation and reduce the risk of impact (see section 18.3.3) and minimise the magnitude of the impact to negligible. Therefore, an impact of minor adverse significance is predicted.
18.6.1.4 Impact 4: Disruption to Aggregate Extraction Activity 77.
There are no aggregate dredging areas within the proposed East Anglia THREE project. The offshore cable corridor is in close proximity to dredging licence area 430, which is located 924m to the north of the offshore cable corridor (Figure 18.3).
78.
Aggregates option Area 446 is located 610m to the south of the offshore cable corridor; however this is currently not dredged. As with other offshore windfarms, “dormant” projects and cancelled projects are not considered as it is not possible to assess impacts to these.
79.
There are two aggregate dredging regions licenced by the Crown Estate in the southern North Sea; East Coast Region and Outer Thames Region. The offshore cable corridor overlaps with both of these areas, however at present these represent much larger areas of search and there is no indication that dredging for aggregates within the offshore cable corridor has been proposed.
80.
Cable installation works will be transient and temporary in nature and are not expected to overlap any aggregate sites. Additionally, no concerns have been raised during consultation by Cemex and Lafarge Tarmac Marine Dredging who operate area 430. Therefore, the only potential impact source will be through possible
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 18 Infrastructure and other users Page 27
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