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Waipukurau Water SH2 Bore Upgrade
The shut down last night was successful, and we have installed the new manifold into the network.
The team of Max Tarr, Veolia and Centralines worked well together to install the new pipes and structures in good time, to allow the supply to be restored in time for the usual morning peak use.
Tonight we carry out a shut down of the supply from the borefield up to the reservoir to allow a new section of pipe to be installed that will facilitate the integration of the new bores into the supply.
The shut down is planned from 11pm through to 5am tomorrow morning.
There will be no water supply impact to residents. We need to undertake the work in the period of low use, to minimise the draw down on the reservoir through low peak water use throughout the shutdown. We will monitor levels and at 4am/5am upon completion we will restore supply and the reservoir will fill again and we will revert to normal operation.
The homes up on Pukeora reservoir will be without power throughout the shutdown. As centralines isolate power at the borefield for safety as we use cranes to install pipes and structures into the network.
There will be minor noise as we run our generator at the reservoir. All affected parties have been notified by council and Centralines.
Last week we installed the new pump into Bore B, and work on installing the pipework from this bore into the main line for connection. a shut down of the line is planned for the night of 4th March 2020 to install a section of pipework to facilitate future connections of the new bores.
We are currently preparing the new bores drilled (Bore D and E) for their pipework, and have poured the concrete aprons around the bores.
The new pumps are being ordered, and the project continues to make good progress.
The extension of the electrical control room is nearing completion and the new switch gear and controls are currently being installed.
This week we successfully installed an air valve on the existing main that runs from the borefield to the treatment plant and the reservoir.
This was a complex task, involving the shut down of the reservoir and the water supply, undertaken at night between 11pm and 4am to minimise disruption and to ensure the lowest demand possible is on the network.
This air valve acts as a key pressure release instrument on the pipeline, to ensure that once the upgraded pumps and bores are operational, the pipeline isn't under any additional stress or risks fracturing.
Final pump testing is underway for the new bores this week, this will inform us on the quantity of water each bore may be able to sustain and supply for long periods without significant draw down. Once we have this information, we can the order the right sized pumps to supply water to the reservoir and treatment plant prior to being sent to Waipukurau residents.
The control room extension is progressing well and the foundation has set and the frame of the new building going up.
We are back onsite, preparing Bore B for a new line shaft pump to be installed and the bore head to be raised to improve bore security.
The new bores are currently under development as we clear them ready to produce water once pumps are installed, over the next few weeks we pump test the bores to understand their capacity.
The new transformer was installed yesterday on site, and is now ready for commissioning once the electrical control room is complete.
This week we continue to work on preparing the bore field for the new underground pipework to be installed.
The transformer is planned to be installed on site on Wed 18th December - ready to be turned on when the electrical room is equipped and complete.
The screens have arrived and we commence installing them into the bores this week.
The temporary bypass has been cut in allowing the transformer work to continue and the above ground pipework to be removed from Bore C.
Work has also begun on the control room building extension this week.
The project continues to progress, with the site temporary fenced.
Excavation has started on site to identify services and confirm the pipe layout, the team is also planning a temporary bypass to allow the removal of a section of above ground pipe.
Tomorrow 20th Nov, Centralines commence work on site to install the pad for the new transformer.
The following week, we are planning a shut down to install a new stainless steel manifold with off takes to allow the new bores and Bore B to be connected in at a later date.
Both bores are drilled to a depth of 8mtrs.
The screens to be installed in the bores are on order, and we expect to have the bores developed by the Xmas break, awaiting their pumps.
Bore drilling is going well, with one new bore in place at 8m deep, and the other approx. 6m deep at the moment, and expected to be completed this week. We can then install the screens and start pump testing. Other works also progress well, and our building shed extension is planned to start in a few weeks along with the power upgrades, and pipeline installation.
After a few weeks of poor weather - we are into the drilling of the new bores at our SH2 Borefield site this week.
These are to replace two aged bores, in preparation for our upgrade of the site with new pumps, electrical controls, automation, meters, and pipeworks replacement. Work is expected to take three weeks to drill these new bores.
Other components of the project continue to progress, with Centralines on site after labour weekend to start with the transformer upgrade and relocation.
Bore drilling is to commence on site from early October 2019 for a period of 3 weeks to replace two bores, works is also expected to take place in mid Oct 2019 by Centralines to upgrade the current overhead 200kva transformer to a pad mounted 500 kva transformer.
A new Pump for Bore B is on order, and the works required to replace Bore D and E is scheduled for Sep 2019.
The electrical design and shed extension is under review.
The project continues to progress with its many facets, and council is working towards a late Dec 2019 completion.
Council has awarded a contract to Max Tarr Ltd in conjunction with WSP-Opus to deliver this key project.
Works and planning are currently underway, with the following key items in progress;
- Camera assessments of the bores
- Relocation and upgrade of the in-situ transformer with Centralines
- Building extension to house the upgraded controls
- Fencing changes
Physical works is expected to commence onsite in Aug 2019, trenching in new pipelines, extending the building housing the controls, and general civil works.
This project has progressed to contract negotiations, and Council expects to have awarded a contract and finalised a programme by early July 2019.
This week, did mark a milestone for works to progress with the re-installation of 'pump A' , this adds resilience back to the borefield and the project team can now focus, on finalising the works to upgrade Bores B, C, D and E.
Council still expects works to take approx 4 months, and be completed by December 2019.
This project is currently under tender and Council expect to have awarded a contract to our preferred supplier in May 2019.
There have been some delays to the works programme due to the unexpected failure of the main Pump 'A' at this borefield. Council expects works to take approx 4 months, and be completed by December 2019.
On completion, there will be four lineshaft pumps including Pump 'A' with the ability to variably pump water to the Pukeora reservoir.
The design aspect of this project is progressing well, council is currently finalising the design and pipe layout and plans to tender this work out in Feb/ March 2019.
Council has a project to upgrade the bores that supply water to the Pukeora reservoir and the township of Waipukurau. A number of the pumps are nearing end of life and require replacement.
Council is also taking the opportunity to upgrade the electrical control system and install flow and turbidity meters on all bores to assist with the maintenance and drinking water standard (DWS) compliance.
Council is currently finalising the detailed design, and is aiming to tender the works out in early 2019 for physical completion by 30 June 2019.
Further updates will be provided as the project progresses.
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