EIA topic Operation
Change in project parameters (as applicable to each topic)
spillages
Impacts only likely from spillages, no change
Decommissioning
Impacts only likely from spillages, no change
Underwater Noise and Vibration and Electromagnetic Fields Note that this chapter provides technical information only which is used in receptor topic chapters
These will be avoided by adoption of standard mitigation, the risk will not increase.
These will be avoided by adoption of standard mitigation, the risk will not increase.
Phasing would mean that piling activities would potentially be undertaken over a longer period (noise)
Under the worst case there is one additional platform, therefore a slight increase in magnitude of effect.
Spill risk will not increase
Key changes in effect/s
Likely change in impact significance
Comment
Spill risk will not increase
The windfarm capacity remains up to 1200MW therefore the worst case scenarios previously considered (in terms of piling hammer energy and number of piling events) is unchanged
Potential for LFAC export cables, only HVDC assessed at PEI (EMF)
Benthic Ecology Construction
There are limited changes in the infrastructure required – in the worst case one additional offshore platform and extra cable within the windfarm.
Phasing does not involve any
Phase III Report June 2015
East Anglia THREE Offshore Windfarm Page 21
There are differences in the effects on EMF from alternating current
There will be greater overall footprint, disturbance of sediment (from cable installation therefore a slight increase in magnitude of effect.
EMF effects will be assessed in the Benthic Ecology and Fish Ecology chapters
Given the limited changes compared with the scale of the proposed project – limited changes in magnitude of effect will not change the significance of impacts.
The assessment will be updated to reflect any changes in piling timings (including potential cumulative impacts)
The chapter will be updated to include LFAC and any newly available information on EMF effects
The ES will update the assessment for the revised parameters.
Phasing will be discussed for construction impacts
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