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19.7.2 Potential cumulative impacts during operation


19.7.2.1 Cumulative Impact 1: impacts to soils, geology and ground conditions 118. As discussed in section 19.6.2 potential impacts come from the requirement for any maintenance activity along the onshore cable route during the life of the projects. It is not possible to say where or when failures of the infrastructure requiring maintenance will occur, however, it is likely that maintenance activities would be focused upon the junction pit locations (which would be sensitively located) and therefore the magnitude of any impact would be low and be highly localised. It is unlikely that failures would occur acrossmultiple projects simultaneously and, therefore, it is considered that cumulative impacts during operation would not be above theminor adverse significance predicted in section 19.6.2.


19.7.3 Potential impacts during decommissioning


19.7.3.1 Under all scenarios at decommissioning cables buried directly into trenches would be left in-situ. Where cables are installed in ducts it may be possible to remove them, therefore, the worst case would be under Scenario 1, where all three projects are constructed. In this case there would be up to two sets of cables (i.e. those from the proposed East Anglia THREE and East Anglia FOUR projects) which could be removed. The potential impacts would then be similar to the potential impacts for construction of the cable route as outlined for Scenario 1 involving construction of temporary access, and excavation at 61 jointing pit locations (refer to section 19.6.1). The cumulative impact would be no greater thanminor adverse.


19.7.3.2 For removal of the converter stations, impact for each would be minor adverse (see section 19.6.1). Given the absence of sensitive geological receptors at this location, cumulative impacts are not considered to be above this however decommissioning is likely phased to further reduce the significance of any potential impacts.


19.8 Inter-relationships


119. Parameters or “sources” that are considered to interact with receptors identified in this chapter are listed in Table19.20 below.


Preliminary Environmental Information May 2014


East Anglia THREE Offshore Windfarm


Chapter 19 Soils, Geology and Ground Condition Page 48


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