7.7 Cumulative Impacts
402. The construction, operation and decommissioning phases of the proposed East Anglia THREE project would cause a range of effects on the marine geology, oceanography and physical processes.
403. The receptors that have been specifically identified in relation to marine geology, oceanography and physical processes are the sensitive ‘East Anglia’ coastline, the ‘Norfolk’ Natura 2000 site, the ‘Suffolk’ Natura 2000 site, and nearby ‘non- designated sandbanks’.
404. The effects that have been assessed for the proposed East Anglia THREE project alone are mostly anticipated to result in no impact in terms of impacts to the above- mentioned receptors (although there are some exceptions). This is primarily because these receptors are located remotely from the zones of influence arising from most of the effects and no pathway has been identified that can link the source to the receptor in most cases.
405. Figure 7.8 and Figure 7.9 show the overlap of ‘zones of influence’ arising cumulatively from the proposed East Anglia ONE, East Anglia THREE and East Anglia FOUR projects in relation to changes on the tidal and wave regimes, respectively. Whilst there is some interaction between the proposed East Anglia THREE and East Anglia FOUR projects, there is no interaction with the proposed East Anglia ONE project. Due to this, there is no potential for associated cumulative impacts on the identified receptors due to changes in these processes.
406. There may, however, potentially be cumulative effects on some of the identified receptor groups arising due to:
Installation or decommissioning of the offshore cable (including works at the landfall of the offshore cable) associated with the proposed East Anglia ONE, East Anglia THREE and East Anglia FOUR projects; and / or
Installation or decommissioning of the offshore export cable (including works at the landfall of the offshore cable) for the proposed East Anglia THREE project and marine aggregate dredging activities in adjacent areas of sea bed.
407. The impacts of the offshore cable installation and decommissioning activities (including works at the landfall) on the identified receptor of the ‘East Anglia’ coast were identified to be of negligible significance for the proposed East Anglia THREE project alone. However, the offshore cable corridor at the landfall is common to the proposed East Anglia ONE and East Anglia FOUR projects in addition to the proposed
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 78
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