Waiwhetu Stream, labelled as 'one of New Zealand's most contaminated', is now undergoing a $21 million transformation to return it to its former glory. The clean up will remove the contaminated sediment, a legacy of untreated industrial discharges that have been pumped into the stream for decades, and will include channel widening and deepening which will provide more effective flood protection for the area.

Brian Perry Civil (BPC) is the main contractor for the project along with Firth Certified Wellington who are supplying the concrete.

"The specialised 'Secant Piling' system used by BPC will strengthen and aid in flood protection," says Cameron Lee, Regional Manager, Firth Wellington. "We delivered an average of 70m3 a day, using five 8 wheelers on rotation - a total in excess of 4,000m3 of concrete. It was a challenging task as we were working in close proximity to the sea so had to coordinate the pump with the piling rig taking into account the tides."

In March, 60 local residents looked over the stream clean up process, shared stories of fishing in the lower Waiwhetu Stream and expressed excitement about its environmental prospects.

"Great to have a fellow Fletchers company involved in this high profile landmark project. Firth were very obliging with the concrete supply with a high demand on flexibility due to the nature of the CFA piling process. I look forward to their support in the future and continuing an excellent relationship."
Damon Winter, Project Manager - Brian Perry Civil.