EIA topic
Table 3.1 Offshore impact assessment screening (refer to Table 2.2 for any relevant changes in infrastructure) Key changes in effect/s
Change in project parameters (as applicable to each topic)
Marine Geology, Oceanography and Physical Processes 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 changes above the worst case changes stated above
Operation
As above – limited changes in infrastructure during operation
Decommissioning
As above – limited changes in infrastructure to be removed at decommissioning
Marine Water & Sediment Quality Construction
There are limited changes in the infrastructure required – in the worst case one additional offshore platform and extra cable within the windfarm.
Phasing requires more vessel movements for construction, therefore greater risk of
Phase III Report June 2015
Magnitude of operational effects (e.g. scour) will be slightly higher due to extra infrastructure
As cables will be left in situ, the only additional impact is from the removal of one additional platform
There may be slight changes to suspended sediment from construction.
With regard to spills, these will be avoided by adoption of standard mitigation.
There will be greater disturbance of sediment (from cable installation), but this would be balanced by the longer duration of the construction phase
Likely change in impact significance
Given the limited changes (one platform and 45km of cable) compared to the scale of the proposed project – limited changes in magnitude of effect will not change the significance of impacts.
As above, limited changes in magnitude of effect will not change the significance of impacts.
As above, limited changes in magnitude of effect will not change the significance of impacts.
Given the limited changes (one platform and 45km of cable) compared to the scale of the proposed project – limited changes in magnitude of effect will not change the significance of impacts.
Spill risk will not increase. East Anglia THREE Offshore Windfarm Page 20
The ES will update the assessment for the revised parameters.
Phasing will be discussed for construction impacts
Comment
The ES will update the assessment for the revised parameters.
Phasing will be discussed for construction impacts
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