Culvert remediation an environmental winner

Culvert remediation an environmental winner
The fi ltration system treats silt contaminated water pumped from the culverts to ensure that it doesn’t create any issues downstream that would affect the water quality.

Steve Bowling Contracting prides itself on delivering high quality, innovative solutions for clients’ projects, which saw it win the NZ Transport Environmental Award at the 2019 North-land Civil Contractors New Zealand annual awards for its work on the Otaika Stream culvert rehabilitation project.
Subcontracting to Fulton Hogan, Steve Bowling Contracting general manager Dean Collinson says that the project was challenging as it involved a double barrel culvert that had experienced severe corrosion issues over a period of years.
The culvert is located on the Otaika stream, which is a stream of significance to the Te Parawhau Hapu, and is also home to many native fish species so extreme care was required to ensure that the local environment was protected at all times, says Dean.
The solution that Steve Bowling Contracting came up with was to develop a simple yet effective filtration system to treat silt contaminated water that was pumped from the culverts to ensure that it didn’t create any issues downstream that would affect the water quality.
“The water from the culverts was pumped into a structure, which was thick geotextile cloth over a large square structure that enabled the majority of the silt and sediment to be filtered out before it re-entered the river,” explains Dean.
“It then passed through two floating silt booms, which sat across the waterway downstream of the works. “This system was very effective and all of the stakeholders were impressed with its performance.’
A project specific environmental plan was developed in conjunction with the project engineer, the client and Te Parawhau Hapu as it was important to assess the environmental factors before any work commenced and ensure all parties were happy with the plan to achieve the works to a high standard, Dean says.
“We also made sure that all staff were aware of the high-risk environment before we began the project. Detailed induction of the staff on the environmental considerations on the project ensured that any questions could be answered and information could be clarified.”

Culvert remediation an environmental winner
The culvert is located on the Otaika stream, which is a stream of significance to the Te Parawhau Hapu, and is also home to many native fish species.

Dean says it was a huge honour to win the Environmental Award for the project at the Civil Contractors New Zealand awards, which aim to recognise and showcase the achievements of the civil contracting industry in Northland.
The awards were judged on criteria including excellence in the finished project, people, safety and the way the company contribute to the local community and the environment.
He says that the overall success of the Otaika Stream project can be attributed to the open communication between all stakeholders at all times during the contract.“This allowed efficient programming, implementation and on-going consultation to ensure that the environment was at the forefront of all decisions made.
“The client and Te Parawhau Hapu were extremely pleased with the outcome of the project and have both forwarded congratulatory mes-sages, thanking us for the successful delivery of this project and our time taken in developing the sediment control system as well as suggesting other contractors could utilise this system on other projects,” says Dean.
Steve Bowling Contracting specialise in a broad range of civil construction including all aspects of concrete construction and repair, concrete foundations, excavation and drainage, retaining walls, bridge construction and repairs, steel shed construction and specialist coating systems.
The company works on residential projects through to local authority projects, commercial buildings and industrial plants, offering advice from the planning stage if required then assisting with the whole construction process from design and consent through to construction and ongoing maintenance.Steve Bowling Contracting works Northland wide and also offers a branch in Auckland.
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