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Appendix B Installation in ducts and cable trenching – comparative impacts 1 1.1 Introduction Direct lay and pre-installed ducts
In the Environmental Statement for East Anglia ONE, the onshore cable route Environmental Impact Assessment is based upon the installation of cables for East Anglia ONE and ducting for cables for East Anglia THREE and East Anglia FOUR (the ducting being included as associated development).
1.2
The inclusion in the DCO submission of ducts for East Anglia THREE and East Anglia FOUR cables to be installed at the same time as the installation of East Anglia ONE cables follows on from consultation responses from local communities and Local Authorities. The overwhelming response from stakeholders was to request EAOL to minimise disturbance from cable installation and avoid a repeat of the scale of excavation, vegetation clearance and vehicle numbers as the case for East Anglia ONE, on a further two occasions for each of East Anglia THREE and East Anglia FOUR, over a number of years.
1.3 In order to understand what the construction impacts would be for the East Anglia THREE and East Anglia FOUR cable installation, this Appendix compares the potential impacts of installation of cables by means of open trenching (Option 2), and the use of pre-installed ducts (but not pre- installed jointing pits) to install those cables (Option 1).
Worst case scenario 1.4
The worst case scenarios for each of the Options discussed in this Appendix are presented in Table 1.1. Given that this is the worst case for both Options, it should be assumed that East Anglia THREE and East Anglia FOUR are constructed separately – therefore impacts would occur twice.
Table 1.1. Worst Case Characteristics of Option 1 and Option 2 for each of East Anglia THREE and East Anglia FOUR