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What happens when we commission Te Mato Vai?

Updated: Mar 15

As we prepare to commission the new Te Mato Vai system, we thought we’d share a few key facts to address key concerns being raised by some members of the community. We’ve also published a description of the commissioning process, which you can find here.


What is the status of the commissioning?

The contractor commenced the first stage of the commissioning process – disinfection of the system using chlorine – at Takuvaine, Matavera, Tupapa and Ngatoe. We expect commissioning work to begin at the remaining sites in the near future, following landowner notification.


What’s involved in the commissioning process?

The commissioning process, including system disinfection and PACl use is explained here.


How will you monitor the impact of the disinfection water discharge of to the stream?

We will do a series of tests on the disinfected water throughout the disinfection process. These tests will both monitor the success of the disinfection process and ensure there is no potential for an effect on the environment.


How will you ensure the disinfection water is safe to discharge to the streams?

We will do a series of tests on the disinfected water throughout the disinfection process. These tests will both monitor the success of the disinfection process and ensure there is no potential for an effect on the environment.


How will you monitor the impact of PACl use on the streams?

During the trials, we’ll do a mix of tests within the water treatment plant and in the streams. This includes testing for dissolved aluminium in water. These tests will be at regular intervals, and each time we need to adjust the amount of PACL we’re using.


Have PACl trials started?

As at 5 February 2020, PACl trials have not yet started. We will give landowners at least 48 hours’ notice before beginning the trials.


Why are you trialling PACl at all 10 intakes?

PACl will be trialled at all 10 intakes for the following reasons:

  1. Trialling PACl at all sites will enable us to capture information specific to each intake site;

  2. Treatment, including PACl use, needs to be applied at a whole of network level to achieve its benefits – improved public water supply quality; and

  3. We are able to manage and monitor the trials to mitigate any potential environmental impact.

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