that the East Anglia THREE site would require up to 730 visits by a jack-up vessel per year.
10.6.2.2.1 East Anglia THREE site 239. It is very difficult to predict the level and extent of maintenance activities that may occur during operation.
240. As previously described in Construction Impact 1 (section 10.6.1.1), jack-up barge feet would penetrate the sea bed disturbing the habitat and affecting the organisms within the footprint. It has been estimated that the maximum area of disturbance would be 0.87km2 per year (Table 10.2) could be caused by Jack-up vessels. The duration of the effect would be temporary and whilst individuals directly within the footprint would not recover, the numbers concerned would be low and there would be no long lasting effects on the wider habitat. Taking this into account, the magnitude of effect would be low.
241. Maintenance work may also be required on cables installed within the East Anglia THREE site. However, it is expected that if the cables are buried to their target depth of between 0.5 and 5m there would be minimal amounts of maintenance required. Therefore, the magnitude of physical disturbance during operation is predicated to be negligible.
242. The receptors to physical disturbance during operation would be the same receptors as those identified in section 10.6.1.1. (Construction Impact 1). These receptors were identified as being of low sensitivity (section 10.6.1), therefore given the negligible magnitude of effect the impact of physical disturbance during operation is predicted to be of negligible significance.
10.6.2.2.2Offshore Cable Corridor 243. The export cables could also require maintenance that may result in physical disturbance. As with the windfarm cables, it is expected that, if the export cables are buried to their target depth of between 0.5 and 5m, there would be minimal amounts of maintenance required and any repair operations would involve temporary and infrequent activity. Therefore, the magnitude of the impact is likely to be negligible.
244. As previously discussed, the habitats within the offshore cable corridor are typical of the East Anglia Zone and the southern North Sea.
245. The sensitivity of the species and habitats within the offshore cable corridor to physical disturbance is discussed in section 10.6.1 (Construction Impact 1) with the conclusion being that sensitivities were either low or medium.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 1 Introduction Page 75
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