The Southern Pipeline is emerging to the surface at Matapihi today.
Project manager Chris Thomas said from the site this morning contractors were working on the final 40m of pipeline casing before it was expected to resurface at Matapihi peninsula at 10am.
It's a major moment for the $99 million project, which has been beset by delays and problems since construction started in Greerton in 2010.
The Southern Pipeline will redirect some of the city's wastewater to the treatment plant at Te Maunga. The new pipeline will relieve the burden currently on the Chapel St treatment plant, allowing the plant to improve its performance.