302. Appropriate off-road vehicles would be used to access each transition pit. Kiosks could be used as an alternative maintenance access point to transition pits.
303. Non-scheduled maintenance to address faults as and when these may arise would also be necessary, and this maintenance could be required in between transition pit or kiosk locations. Appropriate off-road vehicles would be used for access.
5.5.4 Decommissioning 304. With regards to offshore cabling, general UK practice would be followed, i.e. buried cables would simply be cut at the ends and left in-situ, with the exception of the inter-tidal zone across the beach where the cables would be at risk of being exposed over time. It is considered that full removal of the buried cables would have a more damaging environmental impact than is the case when leaving them in-situ. Excavation or jetting may be necessary to remove the cables in the inter-tidal zone.
305. The transition pits would also be left in-situ.
5.6 Onshore 306. Table 5.25 provides a list of parameters and their associated characteristics for the proposed East Anglia THREE project.
Table
5.25.Indicative project characteristics onshore Parameter
Grid connection location Export cable route length
Converter station compound area Number of substations
Number of onshore HVDC cables Number of ducts Fibre Optic cables
Characteristic
Bramford substation 37km
Up to 2.61ha Up to two Up to 4
Up to 4 (Scenario 2 only) Up to 2
307. As discussed previously (section 5.2) there are two scenarios for the installation of onshore cables for the proposed East Anglia THREE project:
Scenario 1: use of pre-installed ducts; or
Scenario 2: open-trenching for cables for the proposed East Anglia THREE project and installation of ducts for the proposed East Anglia FOUR project.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 5 Description of the Development Page 67
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