Bugs, Problems...design Water Supply System



Bugs have been found in water drawn from Palmerston North's artesian sources for the first time, but were caught before they could get into the water supply network.

The discovery of bacteria, including one positive test for E coli, has delayed commissioning of a bore at Papaioea Park and prompted calls for information about the security of other bores in the city.

City council water and waste services manager Robert van Bentum said meeting drinking water standards had become a critical issue since the 2016 Havelock North tummy bug outbreak caused by the water supply.

Water

Standards were only likely to become more stringent, and he recommended spending $550,000 on a UV treatment plant at the bore, in anticipation the treatment might become mandatory in future.

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Work on the bore, the third on the site, was well under way last summer when a long, dry spring prompted water use restrictions to be imposed early.

In January, tests showed the presence of total coliform bacteria – the sort found in humans, animals and some plants. Download pokerstars para windows phone.

Cold And Hot Water Supply System

Van Bentum said it was assumed the source of contamination was introduced during construction, as no other bores in the vicinity were affected.

The bore was flushed between January and April, but the bacteria counts persisted. Disinfection efforts failed to eliminate the problem.

The positive test for E coli meant the bore could not be commissioned until 12 months of clear tests was achieved.

Van Bentum said the clock would re-set on the one-year rule every time a positive test for E coli was produced, further delaying use of the bore.

Examples

Rather than abandon the bore, he proposed installing UV treatment. Otherwise, there was no chance the bore would be able to be used this summer.

The council's finance and performance committee recommended moving $130,000 from a budget for retaining walls at the Turitea water treatment plant access road, adding an extra $420,000 in new spending to pay for the work.

But the expensive news did not end there.

Water Supply System For Building

In total, van Bentum recommended $1.4 million in spending this year on water supply projects to eliminate risks. Some of the money could be shifted from other water projects, or brought forward from planned future projects.

Extra money was needed to complete and commission the Railway Rd bore, to install storage tanks at bore sites, and beef up measures to avoid other risks to the water supply.

Small reservoirs at the bore stations would help supply water at peak times without having to work the bores harder, provide a buffer of stored, treated water in emergencies, and improve chlorination treatment.

Bugs, Problems..design Water Supply System

Councillors said it was unpleasant having to approve extra spending, but they had no choice.

Bugs Problems.design Water Supply System Cody Cross

'The issue of water safety has to be one of our top priorities,' Cr Lorna Johnson said.

Bugs Problems.design Water Supply System Diagram

And Cr Brent Barrett successfully called for a follow-up report on water quality tests at the city's other bores to reassure councillors there was no other contamination detected.