Page 297 - Alderney Regional Environmental Assessment of Renewable Energy: Environmental Report

Alderney Regional Environmental Assessment of Renewable Energy:
Environmental Report
In implementing the Plan it will also be important to ensure that robust project level
assessments are undertaken and that appropriate mitigation measures are incorporated into
project design.
9. Summary of Data Gaps, Impacts, Mitigation and Monitoring
Potentially moderate or major significant adverse impacts that will require mitigation are
summarised in the Table 48 below. These are the key impact pathways that will need
particular consideration by individual developers at the EIA project level.
Table 48. Key potential impacts
Receptor Potential Impact Pathway Impact
Significance
Residual Impact
Following
Mitigation
Marine
geomorphology
Alteration of seabed form and features during
operation, construction and decommissioning
of tidal stream turbines
Insignificant to
major
Insignificant to
minor
Physical processes Alterations to tidal regime and sediment
transport during operation of tidal stream
turbines
Insignificant to
major
Insignificant to
minor
Benthic ecology Direct loss and/or damage to benthic habitats
during construction and operation of tidal
stream turbines, cable routeing and offshore
substations
Insignificant to
major
Insignificant to
minor
Potential for non-native species introductions
during construction of tidal stream turbines,
cable routeing and offshore substations
Insignificant to
moderate
Insignificant to
minor
Fish and shellfish Noise/vibration during construction of tidal
stream turbines and offshore substations
Insignificant to
major
Insignificant to
minor
Collision/entrapment risk during operation of
tidal stream turbines
Insignificant to
major
Insignificant to
minor
Electromagnetic field (EMF) effects during
operation of cables
Insignificant to
moderate
Insignificant to
minor
Ornithology Changes to foraging habitat availability
during construction of tidal stream turbines
and offshore substations
Insignificant to
moderate
Insignificant to
minor
Noise/vibration during construction of tidal
stream turbines and offshore substations
Insignificant to
moderate
Insignificant to
minor
Collision risk during operation of tidal stream
turbines
Minor to major Insignificant to
minor
Collision risk during operation of onshore
wind turbine
Minor to moderate Insignificant to
minor
Marine mammals
and turtles
Noise/vibration during construction of tidal
stream turbines and offshore substations
Insignificant to
major
Insignificant to
minor
Collision risk during operation of tidal stream
turbines
Moderate to major Insignificant to
minor
Electromagnetic field (EMF) effects during
operation of cables
Minor to moderate Insignificant to
minor
Nature
conservation
Loss/damage and/or disturbance during
construction, operation and decommissioning
Insignificant to
major
Insignificant to
minor
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