Marty Sharp / Things.
Ahorieri Astori (T. Wanganui-a-Oroti), Napier, where most of the city’s storm water ends. (File photo)
Sampling of a Napier waterway entering a famous basin has revealed a huge study for zinc, 53 times more than the world’s heaviest metal-contaminated rivers.
Napier City Council staff carried out the sampling as part of a project to prevent further degradation of the Ahoriyi Astori, T. Wanganui-a-Orota and associated waterways.
The staff analyzed sediment samples from the Thames and Tynewaterways for various heavy metals and other contaminants.
In an article before the council, discussed at a meeting Thursday, staff used zinc readings as an example of heavy metal pollution levels.
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To put the readings in context for the staff of the consuls, the readings were compared to a study conducted in Ria de Hoelva Astori, Spain. The Ria de Hoelva reservoir has been plagued by years of industrial mining and is considered one of the most heavily polluted rivers in the world.
The highest amount of zinc in the Ria du Hoelva samples was about 13,000 counts per second.
Reading from Thames / Tyne Waterway was 53 times more.
Readings of other contaminants were low, although polychlorinated biphenyl readings at one site exceeded the guideline value by 34 times.
“Since most of the pollution was within 40 cm above the sediment, there was an opportunity to remove it by dredging,” the article said.
The next step will include investigation options and costs.
“Given the proximity of the Thomas Tyne Network and the history of water quality within the Thomas and Tyne, this project is necessary to ensure the sustainable improvement of a socially and environmentally important, yet fragile river,” the newspaper said. Is.” Say.
Once the rehabilitation options have been developed through appropriate expertise, transparent communication with stakeholders will guide the selection and implementation of the preferred option to improve the Thames Tine waterway system.