Newlands Cross Upgrade EIS - European Investment Bank

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South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement Arup Consulting Engineers south of the scheme and for the diversion of the BGE transmission line, access to the site and egress from the site will be required at a number of points along the N7 westbound carriageway. During the construction of the approach embankments and the bridge structure, a number of access and egress points will be adopted to enable the Contractor to access and depart form the site onto either the N7 eastbound or westbound carriageways. Localised access and egress will be required to facilitate the excavation and construction of the central pier to the bridge structure at the junction of Belgard Road and Fonthill Road South. Construction of the proposed scheme can be expected to cause some disturbance to the community and road users as a result of the additional construction induced traffic generation. In order to minimise disruption to existing traffic, a Traffic Management Plan for construction traffic will be developed whereby construction vehicles would be confined to appropriate roads and safe access and egress points would be identified along the extent of the scheme. Traffic Safety All construction activities will be separated from public traffic. All construction works will be undertaken in a clearly delineated site area which will have specific entry and exit points for construction related traffic onto the public road network. 4.3.7 Preparatory Works Definition of the Site Boundary treatment in the form of a fence will be erected prior to the commencement of construction in areas adjacent to residential properties, Newlands golf club and in the private property located southeast of the existing junction. This will define the extent of the construction site. Refer to Figure 4.9 for an outline of the permanent and temporary landtake requirements for the Scheme. Where works are to be undertaken adjacent to the existing road, temporary traffic barriers will be erected to separate the construction works from the Public and to define the areas within which construction will be undertaken. To implement the overall temporary Traffic Management Plan will necessitate a number of phased diversions on the N7 westbound carriageway. Once the proposed diversion to the N7 westbound carriageway is complete, then the main construction works to the N7 approach embankments and bridge structure may commence. Advance Works Subject to Statutory Approval, it is the preference that the Bord Gáis Éireann (BGE) transmission line, a 500mm diameter 19 bar gas pipeline running along the Southern side of the Westbound carriageway on the N7, would be diverted as an advance contract. However the works could also be undertaken as part of the main Contract if required to do so. The diversion of the other services at the junction including electricity, gas, water mains, sewers and telecommunications will be undertaken as part of the main Contract. The responsibility for the relocation of utilities will, in general, rest with the appropriate utility provider. The nature and extent of the relocation works will be agreed with the utility provider before construction commences. December 2007 Page 79
South Dublin County Council N7 Newlands Cross Upgrade Environmental Impact Statement Arup Consulting Engineers 4.3.8 Public Traffic Management During construction it will be necessary to undertake temporary traffic management measures to create space within which the contractor can safely undertake the construction works. As discussed in Section 4.3.3, the nature of the construction activities including the phasing, duration and extent of road closures is a balance between efficiency of construction and minimising the impact on local residents and road users. Therefore construction periods and working hours will vary at various times throughout the duration of the Contract. During the construction phase, the contractor will be required to maintain three-lanes of traffic in each direction along the N7 together, with a bus lane on the N7 westbound carriageway as far as the Belgard Road junction. The existing junction can accommodate left and right turning, and straight through movements at the junction. The contractor will have to accommodate all of these movements in the temporary traffic management system at suitable positions along the length of the scheme. Some temporary closures may be required during the off-peak periods, in which case traffic diversions, and at times contra flows, will be required to facilitate construction activities. It is anticipated that the installation of any precast or fabricated beams for the bridge structure will necessitate a number of night time possessions as described in Section 4.3. 3 above. Pedestrian and cycle traffic will be accommodated at all times through the junction. The procedures for the temporary closure of a road will be in accordance with those specified in Section 75 of the Roads Act 1993 and all diversion routes will be appropriately signed and notified in advance via media reporting. The contract documents will clearly state the responsibilities of the contractor in respect to traffic management. In particular, the documents will specify maximum limits for the extent and duration of road and lane closures, ongoing diversions and advance notice required before implementing and changing the traffic management measures. During the construction phase the contractor will be required to arrange specific approval of the detailed traffic management proposals with the relevant local authority and emergency services, and to advertise the diversion routes and construction measures. 4.3.9 General Construction Methods Earthworks Construction of the road approach embankments to the bridge structure spanning the R113 Belgard Road constitutes the major earthworks activity on this project. The embankments will be approximately 9m high where the embankment interfaces with the bridge. Topsoil and subsoil will be excavated and replaced with road construction. Materials will be transported to and from site using the existing road network. Excavation and filling will be carried out using mechanical plant. The embankments will be constructed using a combination of suitable excavated material from the site and imported fill material. The fill material will be compacted using static and vibrating rollers or similar equipment. The embankments will be constructed using either reinforced soil or reinforced concrete retaining walls with a specified range of acceptable finishes to the exposed faces of the embankments. The requirements for the aesthetic appearance of the embankments will be specified in the contract documents. Pavement Works Bituminous paving will be undertaken throughout the extent of the scheme. Bitumen macadam and asphalt are generally described as blacktop. The blacktop surface on the existing N7, Fonthill Road South and Belgard Road will be planed off or excavated and removed from site for recycling. December 2007 Page 80
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PLATES
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APPENDIX A5 - TRAFFIC AND TRANSPORT
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South Dublin County Council Newland
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0 kilometres 2 Scale N.T.S Ordnance
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APPENDIX A8 - NOISE AND VIBRATION
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APPENDIX A9 - AIR QUALITY
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APPENDIX A11 - ECOLOGY
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APPENDIX A12 - ARCHAEOLOGY, ARCHITE
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Newlands Cross Upgrade EIS - European Investment Bank

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