surface water management systems to remove oils and fuels accidentally spilled / accumulated during construction.
100. With adherence to the above mitigation, and based on the previously defined magnitude and sensitivity, it is anticipated that there would be a negligible residual impact on soil, geology and ground condition during operation.
19.6.3 Potential Impacts during Decommissioning 101. This section describes the potential impacts of the decommissioning of the onshore electrical transmission works with regards to impacts on soils, geology and ground condition. 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. Further details are provided in Chapter 5 Description of the Development.
19.6.3.1 Landfall and Onshore Cable Route 102. It is anticipated that the onshore cable would be decommissioned (de-energised) and trenched cables left in-situ. Under Scenario 1 where cables are placed in ducts, it may be possible to extract the cables relatively easily during the decommissioning phase. It has also been assumed that the jointing pits and ducts would be left in-situ.
103. The worst case scenario would therefore be under Scenario 1 if cables were to be removed from ducts. 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 impacts and their significance should the cable require removal via excavation are listed in Table 19.21.
19.6.3.2 Converter station 104. 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 electrical equipment located outside of the converter station buildings ;
Removal of cabling from site;
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 19 Soils, Geology and Ground Condition Page 42
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