Transmission Gully update – 11 February 2022


One additional safety and quality assurance test was met last week by CPB HEB, the builder of Transmission Gully. Some of the outstanding tests require remedial work before they can be met, including the road surface and pavement and construction defects.

Out of 100 safety and quality assurance tests currently required under the Public Private Partnership (PPP) contract before the road can safely and legally open, as at 4 February 2022, 54 final test submissions have been received from CPB HEB, of which 42 have been accepted by the Independent Reviewer as meeting the required standards. Examples of safety and quality assurance tests not yet completed by CPB HEB include tests verifying that any construction defects have been appropriately rectified, tests that relate to compliance with pavement and surfacing requirements, and other tests that show the contractor is operationally ready for road opening. 

As at 4 February 2022, only three consent tasks remain outstanding. All of these are now with Greater Wellington Regional Council for certification or confirmation. Construction work is continuing on the physical stormwater system - a fully functioning stormwater system, capable of treating road run-off water to the required standard must be operational for road opening. 

Completion of the safety and quality assurance tests by WGP and CPB HEB, alongside meeting consent conditions, are ultimately what will determine when the road can open.

Under the terms of the Public Private Partnership (PPP) contract for the project, road opening is determined by Transmission Gully contractor WGP and their subcontractor CPB HEB Joint Venture meeting all contractually agreed safety and quality assurance tests. Building a road that meets these tests is the responsibility of WGP and CPB HEB. Assessing whether or not the tests have been met is the responsibility of the Independent Reviewer. This is how Waka Kotahi ensures we are getting what we are paying for on behalf of the public in terms of quality, safety and performance over the period of the contract.