processes (ABPmer 2012a). This concluded that whilst there would be changes (or effects) in baseline marine geology, oceanography and physical processes, the only receptor grouping to which possible significant impacts and possible significant cumulative impacts could occur was the ‘East Anglia’ coast.
411. It should be noted that there is potential for effects (such as changes in suspended sediment concentrations or changes in the tidal, wave and sediment transport regimes) arising from the construction, operation and decommissioning phases of the proposed East Anglia THREE project to act cumulatively with the proposed East Anglia FOUR project due to their proximity, but there would remain no cumulative impacts arising from this on the identified receptors in specific relation to marine geology, oceanography and physical processes.
412. The significance of potential impacts on other receptors arising fromthese possible cumulative effects between the proposed East Anglia THREE and East Anglia FOUR projects are discussed in the relevant chapters of this PEIR.
413. In addition to the above considerations, the present assessment for the proposed East Anglia THREE project has assumed a worst case that up to 10% of the offshore cables cannot be buried at the cable crossings or locations further east and would require some form of cable protection works. Inshore of the cable crossings, these works are assumed to be required along up to 2.5% of the offshore cables as a worst case. This is based on recent practical experience of cable installation which demonstrates that achieving 100% burial is not always possible, and therefore warrants bespoke consideration here.
414. In locations west of the cable crossings, there is potential forminor cumulative impact on the ‘Suffolk Natura 2000’ site (particularly parts of the Outer Thames Estuary SPA located within due to the proximity to the offshore cable corridor) and the ‘East Anglia’ coast should the offshore cables of each of the proposed East Anglia ONE, East Anglia THREE and East Anglia FOUR projects require cable protection works in line with the worst case assumptions.
415. Similarly, there is potential at the cable crossings or in locations within the offshore cable corridor that are around 20km further east for minor cumulative impact on the ‘Suffolk Natura 2000’ site should the offshore cables of each of the proposed East Anglia THREE and East Anglia FOUR projects require cable protection works in line with the worst case assumptions.
416. Consequently, export cables would be installed using a best practice approach with the objective of minimising, as far as practicable, possible effects on key receptors.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm Chapter 7 Marine Geology, Oceanography and Physical Processes Page 80
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