Our long-term programme to upgrade North Shore City’s 44-year-old wastewater treatment plant continues with a $16.2 million project starting next month to future-proof the plant for another 20 years.

These works, which include building two concrete sedimentation tanks – each the size of two Olympic swimming pools – will more than double the plant’s sediment storage capacity and boost its processing capacity by 70 per cent.

So far we have invested $87 million in upgrading the plant.

This project, which is stage five of a series of upgrades that began in 1993, will further improve the plant’s efficiency and reliability, and help reduce odours.

Works will be undertaken by New Zealand-based contractor, Fulton Hogan, and are expected to be finished in December 2007.