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Galloper Wind Farm Project - National Infrastructure Planning

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2890_mitigation<br />

15<br />

August 2011<br />

<strong>Galloper</strong> <strong>Wind</strong> <strong>Farm</strong> Substation<br />

4.2. Proposals submitted with the Development Consent Order<br />

The final proposals that will be submitted with the Development Consent Order are<br />

presented on drawings 2890/07H and 2890/12 in Appendix 4.<br />

The strategy draws on the principles set out in section 3.0. It relates to the treatment of<br />

land outside the substation as the design of the substation itself will be carried out by<br />

future competitive tender. The principles of the location, heights, colour etc. of<br />

substation infrastructure are therefore not discussed further but will be addressed as<br />

the design of the substation evolves, following the principles set out in section 3.0.<br />

4.3. Profiled landform around substation<br />

Many iterations of engineering and landform permutations have been undertaken by<br />

<strong>Galloper</strong> <strong>Wind</strong> <strong>Farm</strong> Limited and it has been concluded that the substation platform<br />

level can be reduced to a maximum level of 9mAOD. This would generate a significant<br />

volume of material that would be used to create a gently profiled landform around the<br />

north, west and east sides of the substation, where it adjoins open fields.<br />

Existing levels: The existing ground within the area covered by the western part of the<br />

substation (the <strong>Galloper</strong> compound) lies between approximately 11.1 and 12mAOD.<br />

The eastern part of the proposed substation (the transmission compound) falls from<br />

approximately 11.4 mAOD in the south-western corner to 7.2mAOD in the northeastern<br />

corner.<br />

Proposed levels: It is proposed that the entire substation will be consented with a<br />

maximum platform level of 9mAOD, but with downward vertical deviation<br />

permissible up to 1m (to 8mAOD) to address potential ground variability and to<br />

achieve satisfactory drainage falls on the platform. Note that this document works on<br />

the basis of impacts from a 9m platform level, this being the ‘worst case’.<br />

The outside face of the profiled landform will be a 1:10 slope so that it does not appear<br />

steep 0r artificial and so that it grades gradually into the existing ground profile. The<br />

inside slope will be 1:3. This steeper slope will not be visible from the surrounding<br />

landscape.<br />

The landform will have a limit of deviation in terms of its height limited to -100mm to<br />

+300mm. Effects have been assessed as -100mm within the LVIA as this is the 'worst<br />

case scenario'.<br />

The landform has been set back from existing trees in Sizewell Wents wood to avoid<br />

the root protection area.<br />

The landform will be created with rounded edges and gentle integration between<br />

existing and proposed slopes.

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