provided below provides a high level likely approach which could be taken. Further details are provided in Chapter 5 Description of the Development.
102. It is anticipated that the onshore cable would be decommissioned (de-energised) and the cables and jointing pits left in-situ. In this case there would be no impact for any receptor upon decommissioning. However, where cables are installed in ducts, it may be possible to remove and recycle them in which case impacts to receptors would be similar to, but likely be of lower magnitude than those described for construction in section 20.6.1. It is assumed that the jointing pits would be left in- situ.
103. Whilst details regarding the decommissioning of the converter station are currently unknown, considering the worst case scenario which would be the removal and reinstatement of the current land use at the site, it is anticipated that the impacts would be similar those during construction.
104. The decommissioning methodology would need to be finalised nearer to the end of the lifetime of the project so as to be in line with current guidance, policy and legislation at that point. Any such methodology would be agreed with the relevant authorities and statutory consultees.
20.7 Cumulative Impacts
20.7.1 Construction Dust Impacts 105. Under the two scenarios for the construction of East Anglia ONE, East Anglia THREE and East Anglia FOUR projects, either:
Cumulative scenario 1 - East Anglia ONE is constructed and installs ducts for East Anglia THREE and East Anglia FOUR. East Anglia THREE cables are pulled through and subsequently East Anglia FOUR cables are pulled through; or
Cumulative scenario 2 - East Anglia THREE is constructed and installs ducts for East Anglia FOUR. East Anglia FOUR cables subsequently are pulled through.
106. Under either scenario the first project would undertake major preparatory works for the following project therefore cumulative impacts would arise from cable pulling and jointing operations (and construction of jointing pits) and the construction of the converter stations. For the cumulative impact therefore the first project to be built will have the greatest magnitude of impact with subsequent projects having smaller and more localised overall impact magnitudes (at the jointing pits, access points to these and at the converter station location).
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 20 Air Quality Page 36
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