10.16. Summary of Impacts, Mitigation, Likely Significant Effects and Monitoring

1097. Information on marine mammals within the marine mammal study area was collected through desktop review, site-specific surveys, and consultation. This information is summarised in Table 10.10   Open ▸ , Table 10.11   Open ▸ , and Table 10.12   Open ▸ .
1098. Table 10.65   Open ▸ presents a summary of the potential impacts, designed in measures and the conclusion of LSE1 in respect to marine mammals. The impacts assessed include:

• Injury and disturbance from underwater noise generated during piling;
• Injury and disturbance from underwater noise generated during UXO clearance;
• Injury and disturbance due to site-investigation surveys (including geophysical surveys);
• Injury and disturbance from underwater noise generated during vessel use and other noise producing activities;
• Injury due to collision with vessels;
• Effects on marine mammals due to emfs from subsea electrical cabling in the water column;
• Injury and disturbance from underwater noise generated during the operation of floating wind turbines and anchor mooring lines;
• effects on marine mammals due to entanglement associated with the array; and
• Effects on marine mammals due to altered prey availability.

1099. Overall, it is concluded that there will be no LSE1 (after implementation of measures adopted as part of the Array and secondary mitigation) arising from the Array during the construction, operation and maintenance or decommissioning phases.
1100. Table 10.66   Open ▸ presents a summary of the potential impacts, designed in measures and the conclusion of LSE1 on marine mammals in EIA terms. The cumulative effects assessed include:

• injury and disturbance from underwater noise generated during piling;
• injury and disturbance from underwater noise generated during UXO clearance;
• injury and disturbance due to site-investigation surveys (including geophysical surveys);
• injury and disturbance from underwater noise generated during vessel use and other noise producing activities;
• injury due to collision with vessels;
• effects on marine mammals due to EMFs from subsea electrical cabling in the water column;
• injury and disturbance from underwater noise generated during the operation of floating wind turbines and anchor mooring lines;
• effects on marine mammals due to entanglement associated with the array; and
• effects on marine mammals due to altered prey availability.

1101. Overall, it is concluded that there will be no likely significant cumulative effects from the Array (after implementation of measures adopted as part of the Array and secondary mitigation) alongside other projects/plans.
1102. No likely significant transboundary effects have been identified in regard to effects of the Array.

.

Table 10.65: Summary of Likely Significant Environmental Effects, Secondary Mitigation and Monitoring

Table 10.66: Summary of Likely Significant Cumulative Environment Effects, Mitigation and Monitoring

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[1] The Conservation of Offshore Marine Habitats and Species Regulations 2017 and the Conservation of Habitats and Species Regulations 2017 transpose the provisions of the Habitats Directive in offshore waters, beyond 12 nm and in relation to applications made under the Electricity Act 1989.

[2] At the time of writing, the SMP is subject to an iterative review process, therefore, the information provided within this chapter is based upon the SMP published by the Scottish Government in 2020.

[3] C = Construction, O = Operation and maintenance, D = Decommissioning.

[4] C = Construction, O = Operation and maintenance, D = Decommissioning.

[5] Council Directive 92/43/EEC on the Conservation of natural habitats and of wild fauna and flora) and Directive 2009/147/EC of the European Parliament and of the Council of 30 November 2009 on the conservation of wild birds.

[6]Anything additional to 30 minutes ADD is considered secondary mitigation and therefore not a designed in measure.

[7] Values in parentheses indicate numbers of animals, and corresponding percentage of reference population, predicted to experience PTS, based on underwater noise modelling of the SELcum metric.

[8] C = Construction, O = Operation and maintenance, D = Decommissioning.

[9] C = Construction, O = Operation and maintenance, D = Decommissioning.