22 March 2017
Central Otago District Council is pleased to announce it has awarded an Operate, Design and Construct contract for upgrading the Cromwell Wastewater Treatment Plant. The contract will be undertaken by Downer NZ Ltd, working in conjunction with Harrison Grierson Ltd, an Auckland based design consultancy.
The contract will commence before 1 April 2017 with an operational phase to run in parallel with design work until October 2017. Construction is expected to start before the end of this year with all works concluded in good time for the commencement of the new resource consent on 1 January 2019.
The overall value of the contract, including for operating the new scheme until July 2020, is $5.7 million. This includes construction costs of $5 million and operating costs of $755,000 over four years.
The expected final cost of the total Cromwell Wastewater Treatment Upgrade project is $9.6 million. This includes connecting Bannockburn to the Cromwell treatment plant and decommissioning the Bannockburn wastewater ponds.
Three Waters Infrastructure Committee Chair Malcolm Topliss said the contract decision marked a milestone for one of the biggest infrastructure projects Central Otago faced.
"This is a major step forward for the district and for the future of the Cromwell area with all the growth and development it is experiencing."
Cromwell Wastewater Treatment Plant is situated off Richards Beach Road just south of Cromwell township. The plant treats all wastewater flows from Bannockburn and Cromwell prior to discharging treated water into the Kawarau Arm of Lake Dunstan. Otago Regional Council has issued new resource consents, which require compliance with new treated water discharge standards before 2019. This new standards are considerably more demanding than the previous consent, hence the requirement for construction of new and improved treatment processes.