104. Avoidance and mitigation measures have been embedded through project design. This includes particular measures during the construction stage to avoid or mitigate impacts on breeding Cetti’s warbler and marsh harrier and non-breeding brent goose, avocet and other waterbirds. A particular risk identified by consultees of disturbance to brent goose by the HDD operation under the Deben Estuary (that would take place under Scenario 2) has been avoided by a commitment by EATL to restrict work activities at that location in the winter period (November to February inclusive).
105. No significant impacts were identified during construction. Those identified impacts ofminor adverse significance would be to marsh harrier, brent goose and the other wildfowl and waders and related primarily to disturbance / displacement effects.
106. Operational impacts would not be significant and would be restricted to maintenance activity impacts at any cable access points (i.e. transition pits or kiosks) and localised except in the case of a cable failure. It is anticipated that the impacts during decommissioning would be similar those identified for construction although these are likely to be of lower magnitude.
107. Given that the three proposed East Anglia Offshore Wind projects will not overlap in terms of onshore construction, cumulative impacts are not considered to be greater than those assessed for construction.
30.3.7 Chapter 25 Onshore Archaeology and Cultural Heritage 108. There is potential for archaeological sites or artefacts from the prehistoric period through to the modern day to be present within the onshore electrical transmission works area. Any impact to an individual asset could be permanent and irreversible in nature however with the use of identified mitigation, no significant impacts are predicted.
109. While there is potential for as yet unknown buried (i.e. potential) archaeological remains to be present within the onshore electrical transmission works and the extent and significance of some recorded assets is uncertain, EATL would commit to a Written Scheme of Investigation (WSI) in line with that proposed for the East Anglia ONE development. This WSI would allow the presence and nature of any archaeological features or deposits to be confirmed and where they would be adversely impacted allow for their preservation by a scheme of archaeological recording. This mitigation strategy will reduce the residual impact on these assets to a minor adverse effect.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 30 Summary and Conclusion Page 20
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