Traffic and Transport; and Landscape and Visual Amenity.
4.1.2.1 Traffic and Transport 46.
The main project design updates considered as part of Phase III Consultation that have the potential to influence traffic and transport traffic effects are:
Removal of Scenario 2 (trenching); Reduction in access points to the cable route; Adoption of the LFAC electrical solution; and Introduction of Phasing.
47.
The removal of Scenario 2 has significantly reduced the numbers of HGV movements and workforce traffic required for the project. The PEIR Scenario 2 presented a peak daily HGV figure of 510 two – way movements and a daily workforce value of 305. Even so, Scenario 2 was assessed as having no significant impacts for the effect of severance, pedestrian amenity, road safety and driver delay.
48.
The electrical solutions and phasing approaches presented in this report all have lower demand for HGV movements and workforce resource and therefore lower magnitude of effect than PEIR Scenario 2, but this is unlikely to change the impact significance.
49.
To ensure the jointing pits can be accessed, lengths of haul road have been introduced along the cable route to serve areas where there is no direct access from the highway. Whilst this was assessed in the PEIR (as Scenario 1), due to refinements in the design there will be an increase of approximately 2km of haul road and in turn an increase in the forecast for the number of HGV deliveries associated with delivering haul road materials.
50.
The LFAC option represents an increase in demand for workforce and materials to Scenario 1 recognising the requirement for additional cabling and excavation / concrete for jointing bays. The Single Phase approach to construction represents the worst case scenario for daily traffic impact as it represents the most intense programme for the movement of materials.
51.
The LFAC Single Phase option therefore represents the new worst case peak flow in terms of daily traffic movements. The increase in workforce and the peak daily increase in HGV deliveries of 54 a day (108 two –way movements) has the potential
Phase III Report June 2015
East Anglia THREE Offshore Windfarm Page 36
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