The CRL is a 3.45km twin-tunnel underground rail link up to 40m deep under the CBD. It includes a redeveloped Mount Eden Station and two new underground CBD stations.

We bring CRL construction expertise from a range of heavy civil construction projects delivered in live environments. Some of the biggest delivery challenges for CRL are not the physical construction elements but working within a live urban environment.

A summary of the contracts scope and the work Alta has been doing across the project includes:

Contract 1 Britomart

Complex construction interfacing with a live station including relocation of station facilities and underpinning the historic CPO building. We were engaged to undertake a methodology review with a specific focus on risk assessment and tunnel ventilation.


Contract 2 Albert St

Deep tunneled stormwater diversion followed by a 400m long cut and cover tunnel box. The scope included deep foundations, earthworks, extensive concrete works and road reinstatement. The challenging live urban context requiring management of complex utility diversions, traffic and business interfaces. The team was involved across the ECI and construction phase under a previous employer including both Project and Joint Venture Governance roles.


Contracts 3,5,7 ‘Grand Alliance’

The main element of the project covering twin bored tunnels, underground and above ground station works and project wide rail systems. We have developed a construction impacts framework covering construction methodology interfaces with road, rail, active modes, parking, surrounding projects and access for businesses. We are continuing to support the project working closely with the Alliance.


Contract 6 Stormwater Diversion

Supporting preparation of management plans and expert input into shaft methodologies impacts on local businesses.