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Silver Stream - Bank Reinstatement

This tender is using the new split file responses feature on GETS. The agency has indicated that they would like to receive responses separated by price and non price components, please keep this mind when preparing your response for submission via GETS.


Tender Closed
RFx ID : 22080517
Tender Name : Silver Stream - Bank Reinstatement
Reference # : 8731
Open Date : Thursday, 12 December 2019 3:00 PM (Pacific/Auckland UTC+13:00)
Close Date  : Thursday, 30 January 2020 4:00 PM (Pacific/Auckland UTC+13:00)
Tender Type : Request for Tenders (RFT)
Tender Coverage : Sole Agency  [?]
Categories :
  • 72000000 - Building and Facility Construction and Maintenance Services
  • 77000000 - Environmental Services
  • 81000000 - Engineering and Research and Technology Based Services
  • Otago
Exemption Reason : None
Required Pre-qualifications : None
Contact : Dave Wish
Alternate Physical Delivery Address  :
Alternate Physical Fax Number  :
Agency Address :

During the flood events of July 2017 and November 2018, significant volumes of material was scoured out of the true right bank of the Silver Stream opposite the Hagart Alexander storm water pump station outlet in Mosgiel. Surveying have assessed the material lost to be approximately 2000m3.

The Dunedin City Council has critical infrastructure which crosses the Silver Stream via a pipe bridge and is the sole source of treated water to North Taieri.
The flood damage has now placed the water supply pipe bridge and subterrestrial pipework at risk. We need this bank reinstated and armoured with rip rap.

What we need
We need the streams original contours to be reinstated with approximately 2000m3 of infill material.
This will then need the construction of a protective riprap wall along 75m of the true right bank. This is to be done whilst ensuring the integrity of the pipe bridge pier and the subterrestrial pipework.
Additionally, we will require the true left bank to be contoured, removing approximately 600m3 of material, which can be reused on the true right bank if suitable.
Repair to the Hagart Alexander SWPS outlet’s reno mattress and finally planting on the true right bank a variety of small flax and grasses within a geotextile fabric and the creation of pools/riffles in the stream bed.

Awarded Status

This tender has been awarded.

  • Downer NZ Ltd - 130, Kerrs Road Wiri, Auckland, 2104, NEW ZEALAND

Award Date: Wednesday, 25 March 2020 1:23 PM (Pacific/Auckland UTC+13:00)