Waimakariri District Council

Contract 26/16 - WWTP Wetland Replanting Improvements - Civil Works - Advertising Notice

CONTRACT 26/16 WWTP Wetland Replanting Improvements 2026/27 – Civil Works

Tenders are invited from suitably qualified contractors for the above contract.

This contract is for the Bulk Earthworks and Civil Construction components of work for the renewal of Wastewater Constructed Wetlands at the Kaiapoi and Woodend Wastewater Treatment Plants in the Waimakariri District.

The main tasks involved in this Contract are:

- Woodend Wastewater Treatment Plant (Gladstone Road Woodend):
 Isolation and dewatering of two existing constructed wetlands.
 Mechanical de-sludging of accumulated wastewater sludge.
 Construction of new planting areas (5000m2 total) using site-won material.
 Construction of final planting layer with imported screened topsoil.
 Widening, repair and reconstruction of wetland bunds and rip-rap basin liner.

- Kaiapoi Wastewater Treatment Plant (Beach Road Kaiapoi):
 Isolation and dewatering of one existing constructed wetland.
 Renewal and replacement of four precast culvert headwalls
 Construction of temporary haul road within the site extents.
 Mechanical de-sludging of accumulated wastewater sludge.
 Construction of new planting areas (5600m2 total) via cut-to-stockpile
 Construction of final planting layer with imported screened topsoil.
 Repair of existing rip-rap basin liner.

Tender documents are available for download from vendorpanel.nz/waimakariri/tenders. If you have not registered for VendorPanel, you may do so using this link: http://www.vendorpanel.nz/marketplace

The VendorPanel Reference Number for this tender is: VP2720

Tenders for this contract close at 4pm on Wednesday 25th November 2026, with tender submissions via VendorPanel.

Tenderers are required to be prequalified to Tier A of Category 8 Earthworks and Bulk Fill for this contract.

Where a tenderer is not prequalified they will need to submit information to meet the minimum requirements of the relevant prequalification category. The tenderer can do this by visiting waimakariri.govt.nz/your-council/council-tenders, completing the relevant form, and submitting to IM@wmk.govt.nz, at least one week prior to tenders closing.