risk. The decommissioning of the project would be subject to a detailed decommissioning programme process as required by DECC under the Energy Act 2004. The approach provided below provides a high level likely approach which could be taken.
21.6.3.1.1 Landfall and Onshore Cable Route 118.
It is anticipated that the onshore cable would be decommissioned (de-energised) and the cables 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 22.6.1. It is assumed that the jointing pits would be left in-situ.
119. The worst case scenario would be if excavation of the buried cables is required to facilitate for decommissioning. The potential impacts would then be similar to the potential impacts for construction of the cable route as outlined for Scenario 2 involving construction of temporary access, trenching and excavation etc. (refer to section 21.6.1). The impacts and their significance should the cable require removal via excavation are listed in Table 21.18.
21.6.3.1.2Converter station 120. In relation to the converter station, the programme for decommissioning is expected to be similar in duration to the construction phase. The detailed activities and methodology would be determined later within the project lifetime, but are expected to include:
Dismantling and removal of outside electrical equipment from site; Removal of cabling from site;
Dismantling and removal of electrical equipment from within the converter station buildings;
Removal of main converter building and minor services equipment; Demolition of the support buildings and removal of fencing; Landscaping and reinstatement of the site (including land drainage); and Removal of hard standing.
121. Whilst details regarding the decommissioning of the converter stations are currently unknown, considering the worst case scenario, which would be the removal and
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 21 Water Resource and Flood Risk Page 42
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