259. The CIA therefore considers the following impacts in detail: •
• 260.
Increases in SSCs and sediment re-deposition during construction and decommissioning, particularly in relation to sandeels; and
Increases in underwater noise during construction and decommissioning (can we rule out operational noise).
In addition to the above, the following impacts as agreed, have been considered in a single generic assessment:
• • •
Physical disturbance and permanent habitat loss; Introduction of hard substrate; and EMFs.
261. Only projects with anticipated construction periods that are likely to overlap with that of East Anglia THREE and which are at sufficient distance for zones of impact on fish and shellfish to overlap spatially are assessed. The proposed construction period for East Anglia THREE is from 2020 to 2023. As shown by Table 11.31 temporal overlap of the construction phases would only occur with Hornsea 2, Triton Knoll and the four Dogger Bank projects.
262. Cefas raised concerns with regard to the potential cumulative effects of the construction phases of East Anglia ONE, East Anglia THREE and East Anglia FOUR occurring at the same time. Although construction periods may overlap there will be no simultaneous piling. Current plans show that construction timelines for East Anglia ONE and East Anglia THREE do not overlap. However, construction for East Anglia THREE and East Anglia FOUR may overlap by up to six months.
263. At present there is no publicly available information that there will be any major oil and gas installation activities which would either spatially or temporally overlap with the construction phase of the East Anglia THREE project. Whilst it is understood that over the longer term, there may be decommissioning and removal of offshore oil and gas infrastructure in the North Sea, the time frames involved are currently unknown and may well occur after construction of the East Anglia THREE project has been constructed. Therefore oil and gas infrastructure is not considered further for cumulative assessment.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 11 Fish and Shellfish Page 82
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