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from existing yards via A12 or A14. established. Apart from at the primary CCS sites, limited extra traffic
Assumptions underpinning the following assessment 1.5
The two options considered are based on the following assumptions:
2 2.1 2.2
Works at the landfall are identical for both options and (under Option 2) are unlikely to be undertaken as part of the East Anglia ONE works; and
Works at the converter stations are identical for both options.
Cable Jointing and Joint Pits – Both Options Cable jointing and joint pits description
Cable joints would be used to connect together two separate drum lengths of cable to make a continuous cable. These would be required whichever option is used to install the cables.
The joint would be completed in a jointing pit, the excavation of which would form part of the trench excavation process during direct lay or require later dedicated construction activity if pre- installed ducts were used. The jointing pit would be back-filled following the cable jointing and the land returned to pre-construction condition.
2.3
The base of the jointing pit must be made level and a concrete slab would be installed to form a working surface. The concrete slab would remain in place following completion of the joint. The size of the jointing pit is dependent on the number of cables coming into the pit, but based on an assumption of two cables per duct, a jointing pit would measure approximately 10m by 3m and would be approximately 2m deep to the top of the level base surface. Once the jointing pit had been back-filled the cables would be approximately 1.2m below ground level.
2.4
It is likely that access provision would be made at some of the joint locations for routine integrity testing. Access could take the form of an inspection pit with a man access cover visible at surface or a small kiosk that would be about 1m high by 1m wide. Both would require some protection from impact by farm machinery.
2.5
The distance between jointing pits would be determined by a number of factors, including the length of cable on any given cable drum and any engineering constraints (such as prevention of tight bends in the route). Typical distances between jointing pits would be between 500m and 1,000m. For the smaller Horizontal Directional Drill (HDD) crossings it is likely that a jointing pit would be required on at least one side of the crossing, and for the larger HDD crossings a jointing pit would be required at both sides.
2.6
Ideally jointing pits should be situated close to the field boundaries where possible to provide easy access during construction (in the case of the cable pulling option) and to provide access to inspection pits or kiosks and minimise visual impact and disruption of farming activities.