the sea bed to a usable state in accordance with the Department of Energy and Climate Change (DECC) decommissioning guidance (DECC 2011).
252. During the decommissioning phase, there is potential for wind turbine, foundation and cable removal activities to cause changes in suspended sediment concentrations and/or sea bed or shoreline levels as a result of sediment disturbance effects.
253. The types of effect would be comparable to those identified for the construction phase, namely:
• • • •
Impact 1: Physical Disturbance;
Impact 2: Increased Suspended Sediment Concentrations; Impact 4: Underwater Noise and Vibration; and Impact 3: Re-mobilisation of Contaminated Sediments
254. The sensitivity of receptors during the decommissioning and is assumed to be the same as given for the construction phase. The magnitude of effect is considered to be no greater and in all probability less than considered for the construction phase. Therefore it is anticipated that any decommissioning impacts would be no greater, and probably less than that assessed for the construction phase.
11.7 Cumulative Impacts
255. As discussed in section 11.4.4, the development activities and measures taken forward for cumulative assessment have been selected on the basis of availability and quality of information and the probability of a cumulative impact occurring, including, where relevant, spatial overlap.
256. Already installed infrastructure, practiced licenced activities and implemented measures have been assumed to be part of the existing environment to which receptors have already adapted.
257. The approach to screening both the impacts and the types of plans or projects to be included within the CIA were discussed with Cefas, Natural England and the MMO during a meeting held on 10th September 2013 meeting (Appendix 11.2).
258.
It was agreed that, in respect of fish ecology, apart from underwater noise and regional impacts of increased SSCs and sediment re-deposition on sandeels, all other impacts can be assessed collectively under a single generic assessment.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 11 Fish and Shellfish Page 81
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