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Clifton wastewater treatment monitoring report

New River Estuary is a 4,100ha tidal lagoon estuary located near Invercargill that has a range of high value habitats including saltmarsh, seagrass, sandy tidal flats, herb fields and native marginal forest.

The Cifton wastewater treatment monitoring report summarises the results of the third year of baseline estuary sediment monitoring as required by the Invercargill City Council as a condition of its resource consent to discharge treated wastewater into the New River Estuary.

Sediment monitoring results:

  • All sites were dominated by sand. Since 2000 mud content has declined.
  • Mud, organic enrichment and freshwater tolerant invertebrates dominate the infauna community.
  • Sediment nitrogen and organic carbon concentrations have declined since 2000.
  • Sediment redox potential discontinuity has deepened (ie more oxygenated)
  • Heavy metals, semi-volatile organic compounds and total petroleum hydrocarbons were well below the ANZECC (2000) ISQG-Low trigger values (ie low toxicity).

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