30.1.12


Chapter 12 Marine Mammal Ecology


Table 30.1.6 Potential Impacts Identified for Marine Mammals Potential Impact Construction


Receptor


Underwater noise – pile driving – Lethal and physical injury effects


Underwater noise – pile driving – auditory injury (PTS)


Behavioural response (avoidance of area)


Underwater noise - vessels


Underwater noise - seabed preparations, rock dumping and cable installation


Impacts upon prey species


Harbour porpoise, grey seal and harbour seal


Harbour porpoise Sensitivity High Medium Grey seal and harbour seal Low Harbour porpoise Medium


Grey seal and harbour seal Low Harbour porpoise


Grey seal and harbour seal Low Harbour porpoise


Grey seal and harbour seal Low


Harbour seal and harbour porpoise


Grey seal


Preliminary Environmental Information May 2014


Medium Low Magnitude No change


No change Low


Low Medium Medium


Negligible Negligible Negligible Negligible Negligible


Negligible Negligible East Anglia THREE Offshore Windfarm Significance Mitigation No impact


Minor adverse


Minor adverse


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


Negligible


Negligible None Negligible


Negligible None Negligible


Negligible No further mitigation suggested beyond embedded


Negligible Residual Impact No impact No impact Minor adverse Minor adverse


Negligible Negligible Negligible Negligible Negligible


Negligible Negligible


Appendix 30.1 Summary Tables Page 13


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