Key Projects
Papakura Water Treatment Plant
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
With the recent efforts to mitigate the drought affects, the Papakura Water Treatment Plant became a key asset for Watercare to upgrade and recommission to provide 12 million + litres per day to the residents of Papakura.
With a strict time frame, we were engaged to complete all site civil enabling works including temporary access roads, block retaining walls, platform, concrete slabs and pavement construction.
Once established on-site, we were then contracted to undertake all buried services infrastructures. Ranging from, new raw water connection for the temporary treatment plant, upgrade and install new chlorinated, filtered, and treated water infrastructure, wastewater pipe and manholes, including upgrading the existing stormwater network.
- CLS pipe installation including valve and meter chambers
- PE & PVC Wastewater & Stormwater
- Structural concrete slabs
- Block retaining walls
- Earthworks bulk out
- Temporary access road
- Temporary Works Design
Lynn Reserve Tomo Remediation
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
With the catastrophic failure of an existing 1050 corrugated steel culvert, a tomo started appearing in a popular recreational park in Lynn Reserve, Glenfield.
Classed as an Emergency Works Project, we established on-site swiftly whilst still negotiating contract terms and contract rates. Site works commenced whilst design and contract works were being collaborated.
- 200m of 1280dia GRP pipe jacking
- Construction of temporary 10.5m deep shaft (UC Beams and Piles)
- Construction of jacking supports
- Structural alterations to jacking and drilling equipment
- 200m of 800PE re-lining
- Concrete structure construction
- Inlet & Outlet rehabilitation
Pukekohe East Reservoir Tie-in
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
Watercare wished to install two wye connections onto the CLS watermain at the Pukekohe East Reservoir.
The reservoir supplies water to a large number of residents in South Auckland, and the contract specifications allowed only a maximum of 12 hours for the watermain to be shut down. In order to achieve the contract requirements, we developed the idea to excavate and hot-tap the mains line in order to install a temporary line to continue water supply during the wye installation. The CLS tie-ins were then fabricated off-site at our workshop in East Tamaki before installation on-site in Pukekohe. Installations occurred on a busy road with a large amount of visibility from
the public, meaning that strict health and safety and traffic management protocols needed to be followed.
Once installed, the tie-ins needed to be tested on-site prior to backfilling and reinstatement works. We completed all works on schedule.
Redoubt Flow Control Valve
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
The Redoubt Road Reservoir Complex stores drinking water from the Waikato Water Treatment Plant. In 2019, Watercare began the process of upgrading the Waikato Water Treatment Plant to operate at 175 million litres per day. This increase required the installation of an additional flow control valve at the Redoubt Road Flow Control Station, increasing the flow capacity to the Redoubt Road Reservoir Complex.
We were tasked with the off-site fabrication, finishing and hydro-testing of all pipes, lids, valves, spools and fittings required.
On-site, we conducted the site investigations and surveys, site preparation including a hot tap, civil and structural works in order to bring the flow control valve online.
Ardmore Water Treatment Plant Treated Water Resilience
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
Fulton Hogan sub-contracted GFS to fabricate and install three cut-ins into the Ardmore Water Treatment Plant CLS mains. Works were to be completed over several stages in order to minimise downtime for end users.
To achieve this, we detailed, fabricated and finished the sections off-site at our yard in East Tamaki. On-site, we utilised line stoppers in order to temporarily dam the mains line. Following the shut-down, we cut out the existing pipe sections and installed the wye sections before removing the line stoppers.
All works were completed on schedule, with a pause to the initial programme as a result of the COVID-19 Level 4 shut-downs.
Sewer Lynn Branch Sewer Diversion (Stage 1)
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
- Microtunnelled 450 OD PE 100 SDR 13.6 PE pipe.
- Deep access shafts drilled using spiral augers.
- Silt Control Plans developed to protect major waterways
- Locations of pipe strings, access shafts and trenches were designed around causing minimum
- inconvenience to members of public and adjacent property owners.
- Connecting to live transmission sewer lines
Sewer Diversion by HDD & Microtunnelling - South Lynn (Stage 2)
LOCATION
PROJECT VALUE
CLIENT
COMPLETED
- Microtunnelled 797m of transmission pipeline (up to 450mm dia PE) via trenchless methods
(with manholes at 4-11 metres deep) - Microtunnelled/Directional drilled 285m of network pipeline (up to 315mm dia PE. With man
holes at 6.0 – 11.0 metres depth) - Stream Crossings via drilling
- Abandoned existing services and removal of six (6) pipe bridges
- Vegetation Management
- Private Drainage
- CCTV & Reinstatement
- Removal of 4 overflows from the creek
- Connecting to live transmission sewer lines
Alanbrooke Sewer Installation
PROJECT VALUE
CLIENT
COMPLETED
- Sewer Installation – Line 55m of 180 dia PE SDR17
- On 1% gradient on 120 metres of a horizontal radius within a slip
Saffron St Wastewater Upgrade
PROJECT VALUE
CLIENT
COMPLETED
- Construction of 123m of 355mm PE wastewater pipes and manholes and upgrades to existing
wastewater pipes by open cut and directional drilling - 50% of work in private properties
- Access to sewer line obstructed by swimming pool
- Manhole was hand-dug within 1m of the swimming pool
- Removal of an overflow from the creek
New Lynn Branch Sewer Diversion (Stage 1)
CONSTRUCTION OF STORMWATER CHAMBER
PROJECT VALUE
CLIENT
COMPLETED
- Upgrade of the main sewer from Manawa Wetland Reserve to Clark St
- Open cut installation of a new 600mm diameter concrete sacrificial sewer line between the
underground pumping station and an existing sewer - Connecting to live transmission sewer lines