Scenario 2 – installing trenches for East Anglia THREE and ducts for East Anglia FOUR
o Construction of onshore cable systems including landfall joint transition bay and cable jointing locations – installation techniques digging trenches to depth of 1.5m and installing ducts for East Anglia FOUR, and undertaking 8 HDD activities;
o Construction of an onshore converter station, associated infrastructure and landscaping;
o Creation of temporary construction compounds and HDD compounds;
o Temporary upgrade of existing access tracks, construction of new access tracks and haul roads;
o Stockpiling of topsoil and subsoil; o Re-use of excavated soil in trenches; o Disposal of excess spoil offsite to a suitably licenced facility; and o Removal and reinstatement of existing drainage systems.
19.6.1 Potential Impacts during Construction
19.6.1.1 Impact 1: Impact on Geology 70.
There is the potential for the construction activities listed above to impact sensitive geology in a number of ways, however, it is considered that geology will only be affected by direct impacts and that geology is only considered to have a value where statutory or non-statutory designated sites occur. One statutory designated site, Bawdsey Cliffs, lies within the landfall footprint. Potential impacts include:
Loss of sensitive geology through excavation and removal of superficial or bedrock deposits;
Loss of slope stability through trafficking, ramp construction, increased loading and excavation;
Increased erosion through trafficking, excavation and destabilisation; and Deterioration of soil quality through spills and leaks.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 19 Soils, Geology and Ground Condition Page 34
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