4.4.5.5 Onshore Cable Route 50.
The results of PEIR consultation for East Anglia ONE, discussions with landowners and the environmental baseline surveys, enabled the Preferred Onshore Cable Corridor to be further refined to an approximately 75mwide onshore cable route. In refining the Preferred Onshore Cable Corridor, the following were considered:
the need to maintain a route within the cable corridor which is as straight as possible in order to allow pulling of cables through ducts;
The need to pick a route which minimises impacts on hedgerows and mature trees;
Routeing of the Preferred Onshore Cable Corridor away from residences; The preference to cross existing significant utilities at right angles;
The desire to route alongside existing roads in order to allow ease of access during construction and operation; and
The desire to avoid the creation of ‘orphan fields’ – areas of fields locked out (and therefore unworkable) behind the working width during construction.
51. Outside of these general principles, other key routeing decisions which were made included:
Straightening out a right angle bend (the result of a juncture of two previous route options) from the Preferred Onshore Cable Corridor between the villages of Tuddenham St Martin and Westerfield.
52. Avoiding Seckford Hall golf course and landfill.
The resulting 75m wide onshore cable route incorporated a working width of 55m (plus 20m limits of deviation), required to allow cables to be installed using open cut techniques and be carefully micro-sited within the limits of deviation to minimise their environmental impact. The working width of 55m incorporates sufficient spacing between cable trenches to prevent overheating and provides room for storage for excavated material and safe passage of construction personnel and vehicles along a haul road beside the trenches.
53.
At certain locations the need for special trenchless construction techniques (e g. HDD) was identified. These locations included environmentally sensitive areas, railways, roads and significant watercourses. In these areas a working width of
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 4 Site Selection and Alternatives Page 12
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