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M7/M8 Portlaoise Bypass PPP

  • Celtic Roads Group Portlaoise Limited
  • Portlaoise
  • Roughan O’Donovan / Faber Maunsell Alliance
  • € 263 million
  • September 2010

This project encompasses the design & construction of approximately 41km of new build motorway class dual carriageway with:

  • Site clearance and route fencing works 
  • Electricity, Telecom and water main diversions
  • Consultation with all interested and relevant third parties
  • Two grades separated junctions at Borris in Ossory (R435) and Grantstown (R433)
  • One half junction upgrade to full junction under Traffic Management at Portloaise West (R445)
  • One motorway to motorway interchange where the M7 crosses the M8
  • 46 principal structures comprising of 18 over bridges and 28 under bridges, including:
    • 5 for Irish Rail
    • 3 for Bord na Mona
    • 8 for Accommodation Works
  • 6 River Crossings including the Gully, Nore, Cappamacloghy, Goul, Mill and Erkina
  • 29 Structural and 6 Non Structural box culverts
  • 23 km of realigned local and regional roads
  • 25 km of Farm /Accommodation Tracks
  • 46 number drainage attenuation ponds
  • A Toll plaza, Administration building and maintenance depot
  • Instrumentation and monitoring (noise, vibration, dust, turbidity, flow meters, wells, piezometers, settlement plates, inclinometers)
  • Maintenance of soft landscaping for establishment period Restrictions included:  Restricted to confining vertical alignment to within +/- 1.5m of that identified in EIS.
  • Protection of the freshwater Pearl Mussel in the River Erkina and River Nore catchment required the preparation and implementation of a stand alone water quality management plan for the site
  • Due to the sensitive nature of the adjoining freshwater aquifers all embankments more than 1m in height required a positive (sealed/kerb and gully drainage system).
  • Kilnaseer Fen (peat bog with underlying limestone aquifer supplying artesian water supply (alkaline)) had to be traversed without affecting the local subterranean drainage patterns.

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