RST Environmental Solutions Ltd


Case Study - Clearendon Road Christchurch

Location - Christchurch

Companies involved

SCIRT/Downer Engineering - David Maucor

Stella Pumps - Trevor

RST Environmental Solutions - Andrew Studholme

The Project

In February 2011 New Zealand's third largest city Christchurch experienced a 6.3 magnitude earthquake. The damage to infrastructure was severe. In the resulting months the government sort to being the rebuild by organising the bigger companies and sharing the rebuild work, SCIRT or Stronger Christchurch Rebuild Team was started, companies involved were Donwers Engineering, Fletchers, and Fulton Hogan and McConell Dow consultants.

RST Environmental solutions have been discussing with ECAN (environment Canterbury) about the benefits of using Haloklear versus an Acrylamide based Flocculent with this in mind Downers were brought to the attention of Haloklear and wanted to trial it.

Downers were working on a wastewater project in Clarenden Terrace, which runs along a medium sized creek. While installing new waste water pipework, water was being pumped out of spear wells, still containing liquefaction mud sometimes the water was and is very turbid.

Trial test

A 6" RST dewatering manifold was installed with one set of DBP and Gelfoc socks, water turbidity was average. Water was pumped through the manifold into a storage tank, which had three segmented chambers then through an out flow onto ground, once there is naturally ran into the stream.


TSS - Pre Haloklear application 80 mg/l

TSS - 1 hour after pumping 55 mg/l

TSS - 5 hours after pumping 28 mg/l

Haloklear Product used

RST Manifold

1 x DBP-2100FS

1 x Gelfloc

The Downer and Stella team watch the installation of the RST dewatering manifold

HaloKlear Dewatering

Below is water entry in Tank


Exit of water into stream.


To watch the video of this application please click link below to watch on YouTube