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HS2 – Section C1 – Pynesfield Quarry Ground Improvement Works

  • Project Type Rail
  • Client HS2 - ALIGN JV (Bouygues TP, Volker Fitzpatrick, Sir Robert McAlpine)
  • Company Involvement Earthworks, Drainage
  • Form of Contract NEC3 Option B
  • Dates September 2020 - April 2021
  • Location Hertfordshire, United Kingdom


Pynesfield quarry was a disused quarry that required ground remediation in order to allow for the placement of the treated tunnel arisings from the Chilterns twin 10-mile tunnels that form part of HS2 section C1.

This contract comprised of the following scope:


Key Features

  • Site De-vegetation
  • Asbestos Management
  • Drainage Works
  • Retention Pond Construction
  • Regrading of Site to Required Profile
  • Installation of 108,000m2 of Geotextile & Geogrid
  • Import and levelling of 50,000T of general fill
  • Import and Placement of 100,000T of Granular Fill for a Combined Drainage Blanket and Working Platform Layer
  • Installation of 77,000 Vertical Band Drains