East Anglia ONE Offshore Windfarm Construction Artificial Lighting Emissions Plan
September, 2016
3 Construction Details
3.1 Construction Details 3.1.1 EnablingWorks
9.
The onshore construction works will commence with the enabling works, which includes the establishment of the construction compounds (herein referred to as Construction Consolidation Sites), fencing and securing the working width, the topsoil strip and the installation of a haul road.
10.
The onshore construction works will be supported by the installation of nine Construction Consolidation Sites (CCSs) (referenced A to I), these are compounds which will be utilised to provide welfare, site staff accommodation, parking, and secure storage for materials, plant and equipment. The CCSs are categorised as either Primary or Secondary, depending on their intended uses. There are two Primary CCSs; CCS B will be a designated storage and delivery facility and the main administrative compound and CCS E will be a main storage and delivery facility, with designated office space. The remaining seven Secondary CCSs shall be used to access the internal haul road, storage and deliveries. The establishment of the CCS compounds will be one of the first construction activities undertaken.
11.
During the construction of the substation, site establishment and laydown areas will be required, including temporary offices, welfare, car parking, materials and equipment storage. The area directly east of the substation will be used as the temporary works area (referred to asWork No 38 within the DCO). At the start of the works the onshore substation compound and temporary works will be temporarily fenced.
12.
The linear nature of the onshore cable route site will require fencing to be installed to both sides along the working width, not only to delineate the route but also to prevent possible vandalism and theft which could lead to possible contamination incidents.
13.
Topsoil shall be stripped from the haul road location, trench areas and subsoil storage areas and stored. Topsoil storage and management shall be compliant with the recommendations and requirements set out in the Cable Landscape Management Plan (EA1-CON-R-IBR-010129). Topsoil shall be stored to one side of the working width, in such a way that it is not mixed with any subsoil. Typically this would be stored as an earth bund of a maximum height of two metres, to avoid compaction from the weight of the soil. Storage time shall be kept to a minimum, to prevent the soil deteriorating in quality. Topsoil stripped from different fields shall be stored separately, as would soil from specific hedgerow banks or woodland strips.
14.
A temporary haul road will be installed along the route between the CCS locations and access points onto the local roads. Temporary haul road construction typically involves the placement of suitable imported stone material on a geotextile, however others methods such as soil stabilisation may be used if considered appropriate. In some instances the temporary haul road may comprise temporary trackway rather than stone due to site specific constraints. Following the initial topsoil stripping the haul road will be installed for a width of 5.5m along a designated route. The temporary haul road shall be constructed working from the installed CCS locations in two direction away from the CCS and towards the adjacent CCS along the onshore cable route.
3.1.2 Onshore Cable Route 15.
The onshore cable route comprises a 37km corridor, between the Suffolk coast at Bawdsey and the substation at Bramford, passing the northern side of Ipswich. The onshore cable works comprise the installation of electricity transmission cables and ducts between the landfall location at Bawdsey and the new substation station, which is adjacent to the existing substation at Bramford. The majority of the route will be constructed using open trenching methods, other than in certain locations where the cable route traverses a number of major transport networks and natural obstacles. To enable the installation of the cable under these features, specialist trenchless techniques will be employed, such as Horizontal Directional Drilling (HDD).
16.
Construction activities will be undertaken within a temporarily fenced strip of land, referred to as the working width. The working width is determined by electrical and civil engineering considerations and allows for sufficient space between the cables trenches to prevent the cables overheating, plus space for the associated temporary construction works i.e. soil storage, drainage, haul road installation and work areas for personnel and machinery. In accordance with the DCO, the
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