East Anglia ONE Offshore Windfarm Landscape Management PlanWork No 38 to 41
August, 2016
Appendix 2 - Soft Landscape General Arrangement (OPEN_150796_EastAng_S001). Appendix 6 – Typical Construction Detail: Planting (EA1-GRD-DG-OPEN-796_D003). Appendix 7 – Typical Construction Details: Plant Schedules (EA1-GRD-DG-OPEN-796_D004 and D005) (details the species and total numbers for each planting area identified on Soft Landscape General Arrangement).
Appendix 8 – Plant Schedule Illustrative Notes presenting sample photographs of the tree species and additional descriptive text.
Appendix 9 - NBS Landscape Specification which includes clauses on both planting and maintenance. 4.4 Ground levels 39.
The finished ground level within the substation compound will be 56m AOD. This will require an amount of re-grading and movement of topsoil and subsoil from within the substation area. It is proposed to use and retain this material on-site to create the earthwork bundings to form part of the visual screening strategy.
40.
The top of the bund on the western side of the substation will be 4m higher than the internal substation level, at 60m AOD, and the bund on the southern side of the substation will be 2m higher at 58m AOD. The intention is to grade the ground up to these levels from the substation at a grade of 1:3. This grade of slope also allows for safe maintenance access. The bund on the western side of the substation is then shaped so that externally it falls at a gentler grade of 1:20 or a maximum 1:5 away from the substation to have a smoothly graded, natural looking slope facing the viewers looking towards the substation.
41.
Additionally, the creation and location of SuDS attenuation basins will also influence the earthwork shaping strategy. There are two permanent basins, one with a permanent pond. Slopes into basins vary at 1:10 to 1:20. The following drawings illustrate these earthworks proposals:
Appendix 3 - Earthworks General Arrangement (OPEN_150796_EA_E001). Appendix 13 – Typical Construction Details: SuDS Details (EA1-GRD-DG-OPEN-796_D006).
4.5 Hard surface materials 42.
The hard landscape proposals for the substation consist of a limited number of elements, creating a relatively simple hard landscape scheme. The following drawings illustrates these hard landscape elements, which are described below:
Appendix 1 - Hard Landscape General Arrangement (OPEN_150796_EA_H001). Appendix 4 – Typical Construction Details: Surfaces (EA1-GRD-DG-OPEN-796_D001). Appendix 5 – Typical Construction Details: Fencing (EA1-GRD-DG-OPEN-796_D002). Appendix 9 - NBS Landscape Specification
4.5.1 Access road 43.
A concrete external access road will lead into the substation. The access road will run parallel to Bullen Lane and the bridleway to the north of the Bramford National Grid Substation in an east-west direction. The junction with the new access road and Bullen Lane will be located just west of the private track to Bullen Hall Farm. This will be a 5m access road with two lay-by/waiting areas suitably sized to accommodate the large vehicles used for the construction and maintenance of the substation. The access road will have no kerb edging in order to achieve the appearance of a rural road. The depths and material of the road build-up will be to the engineer’s specification using a construction detail that allows for the correct dispersal of loadings throughout the sub-base. The access road will have a lay-by / waiting area, suitably sized (20m x 3m) to accommodate the long vehicles used for the construction and maintenance of the substation. This lay-by is located just past the junction between the access road and Bullen Lane.
4.5.2 Grass-road maintenance track 44.
A maintenance track to allow access to the main SuDS attenuation basin will be constructed using a plastic cellular grass- road reinforcement system. A temporary wearing course will be installed during the substation construction phases. This final grass surface will be installed post-construction once the expected traffic flow will be reduced.
East Anglia ONE – EA1-CON-F-GBE-008554
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