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Marsden Valley Sewer Trunk Main

Client: Nelson City Council
Location: The Ridgeway, Isel Place, Marsden Valley Nelson
This Sewer main project was a very interesting as its alignment went through many easements in private land and even under houses in some areas, there were also several types of pipe used with different installation methods for each type.

Donaldson Civil carried out the works in several stages to enable the sites to be completed on time for the client’s delivery date.

The trunk main consisted of 640m of 225mm PVC main and 120m of 200mm PE line ranging in depth from 1.2m to 2.7m. The PVC pipe was laid by traditional open cut method, the PE lines were installed by the trenchless method pipe cracking using a 50 Tonne pipe bursting machine. There were sub-mains and laterals completed as part of the works, most of these were through back yards and under services so the bursting method was again employed, using screw join PVC pipe (a first for Nelson City Council project). This resulted in a much tidier job for landowners and the client.