Table 30.1.7 Potential Cumulative Impacts Identified for Marine Mammals Potential Impact


Receptor


Underwater noise – all sources


Sensitivity


Harbour porpoise Medium Grey seal


Harbour seal (UK level)


Low Low


Impacts upon prey species Harbour porpoise Medium Grey seal


Harbour seal (UK level)


Vessel interactions Low Medium


Harbour porpoise High Grey seal


Harbour seal (UK level)


Magnitude High


Medium


Medium (High)


Medium Low


Low (Medium)


High High


Medium Medium


Medium (High)


Significance


Minor adverse Minor adverse


(Moderate adverse)


Moderate adverse


Minor adverse Minor adverse


(Moderate adverse)


Major adverse None Major adverse Major adverse


None


Mitigation


Major adverse No further mitigation suggested beyond embedded mitigation (soft start and MMMP)


Residual Impact Major adverse Minor adverse Minor adverse


(Moderate adverse)


Moderate adverse


Minor adverse Minor adverse


(Moderate adverse)


Major adverse Major adverse Major adverse


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Appendix 30.1 Summary Tables Page 16


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