Although this project has been in development since 2002, the EA was not approved until early 2010. The earth pressure balance tunnel boring machines, segmental precast concrete tunnel lining, and the biofilters and bioscrubbers used for odour control were all procured in advance by the owner. Hatch Mott MacDonald and AECOM (in a joint venture) completed the design of the tunnel, shafts, and surface facilities and are administering the construction contract. Project design involves a 15-km-long, 3,000-millimetre-diameter tunnel with 17 access shafts ranging between four and 48 metres in depth and four to 14 metres in diameter.
Construction is underway, with tunnelling completed and shafts and facilities being fitted. Live flows were commissioned by the end of 2014. The project is scheduled for completion by 2016.
