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Hutt City Awards 6.7 Million Contract
4 August 2005
Hutt City Awards 6.7 Million Contract
Hutt City Council has awarded a $6.7 million contract to Brian Perry Civil for the construction of a 10 million-litre wastewater storage tank at Silverstream.
The purpose of the facility is to significantly reduce overflows of sewage to the Hutt River, which can occur during heavy rain.
Work to be undertaken under the contract includes modifications to the River Crossing Gauging Station, a 1,200 litre per second pumping station, the fully covered 10 million litre concrete storage tank, a tank cleaning system and overflow screen.
The tank will be controlled automatically and remotely monitored from the Seaview treatment plant control room. The tank will be the largest such facility in New Zealand. Hutt City already has a 2.5 million litre tank in Wainuiomata, which has been operating since 2001.
Hutt City Council Utility Services Divisional Manager Bruce Sherlock said any overflows from the tank will be dilute, settled and fine screened and discharged into the Hutt River, which will generally be in flood.
"Programmes to reduce inflow to both public sewers and private lateral connections are underway in both Hutt City and Upper Hutt City to further reduce sewage overflows, but at present the system gets overloaded during heavy rain," said Bruce Sherlock.
"The community have made it clear that they regard protection of the environment highly. This project contributes towards achieving that Community Outome."
Project manager Alan Bannatyne of MWH said the project had been in planning for several years. Various options to reduce the overflows were investigated in 1997 and storage was determined to be the best solution for the Hutt Valley sewerage network.
Resource consents were obtained in 1998 and the work was staged to follow construction of the Seaview wastewater treatment plant. The former animal isolation site was purchased from MAF in 1997 and the land was designated in the Upper Hutt City Council District Plan for wastewater purposes.
"Hydraulic modelling of the trunk sewer network was undertaken in 2004 to determine the size of storage tank required. Detailed design of the facility was tendered and the final tank location and connection into the existing sewers was agreed early this year," said Alan Bannatyne.
The facility is due to be operational by August 2006.
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