Preliminary exams present no lead contamination within the Waikouaiti River, however there are nonetheless extra outcomes to come back and the Otago Regional Council has ramped up surveillance.
The river feeds the reservoir, which has examined optimistic for prime ranges of lead.
Otago Regional Council (ORC) is working with Dunedin Metropolis Council (DCC) on the response. ORC chief govt Sarah Gardner advised Checkpoint it’s answerable for consuming water at supply.
“We took water samples on the morning of four February after the warning was issued by DCC to not drink the water. The outcomes have come again at this time and people outcomes down no lead at detectable ranges within the river water.”
ORC had additionally examined river sediments however was ready for these outcomes, she stated.
“It could possibly be that the supply of the contamination is sitting within the sediment and polluting the water from there, reasonably than being mobilised within the water itself.
“These outcomes that we’ve at this time, they offer us a snapshot, a cut-off date, additionally they give us some course for additional investigation. However actually what we have to do is an in-depth investigation that may contain in depth floor water and sediment monitoring of the river.
“It is provided that you try this, you’ve various samples and also you get various outcomes, you can generate some confidence in what is definitely taking place.”
Testing for lead was not a part of the usual state of the setting suite of testing the council did routinely, she stated.
“We’ve got no document of any lead within the water at that web site. However that is to not say that we’ve a whole document, and even in depth testing of lead at that web site.
“I do not suppose we have discounted any prospects… We have had a have a look at some specific websites, we have had a have a look at consent monitoring within the space – that hasn’t given us any trigger for concern. That is why we’re persevering with to research.
“We’ll preserve doing these investigations till we get a passable end result, whether or not that is with the ability to verify with confidence that the river water is not the problem, or whether or not that is discovering one thing that’s because the supply of contamination.”
The water pipes have been DCC’s accountability, Gardner stated.
“Dunedin Metropolis Council is the water provider, and they’re answerable for the community. We’re answerable for defending consuming water high quality at supply.”
A catchment investigation was underway, she stated, which would come with in depth floor water and sediment monitoring of the river.
“It is actually a big deal extra of monitoring and testing than we might have achieved routinely.”
A flyover by DCC recognized two websites of curiosity that Otago Regional Council has examined, together with a web site with containers and outdated tyres close to the river and Waikouaiti water therapy plant, and a web site with clear fill and waste on the headwaters of the Waikouaiti River.
Each websites have been dominated out as sources of lead contamination.