| 61 CONTRACTING CB Civil TRUSTED HYDRO EXCAVATION & DRAINAGE SPECIALISTS HYDRO EX ROAD SWEEPING DRAIN UNBLOCKING CCTV INSPECTIONS VACUUM LOADING GREASE TRAPS CESSPITS DRAINAGE AUCKLAND & WAIKATO 24/7 GET IN TOUCH TODAY: 0800 683 7356 admin@freeflowdrains.co.nz Over 10 years of experience delivering reliable drainage solutions for residential and commercial clients. Professional service, expert solutions, and the right equipment to get the job done. T T Russell Fredric Drainlaying at its most complex Access was one of the biggest challenges, with much of the work carried out in high-density residential areas and beside existing homes. CB Civil’s Ranfurly Gully wastewater upgrade has earned a CCNZ Waikato award after combining complex construction with work around more than 50 residential properties. The project for Hamilton City Council won the CCNZ Waikato Hynds Construction Awards Category Four win for projects valued at $10–$20 million The project began with early contractor engagement around constructability before CB Civil submitted a proposal that was stress-tested against the market and negotiated from there. The existing Fairfield wastewater network directed flows through an undersized asbestos-cement pipe running through Ranfurly Gully. Parts of the pipe were failing, prompting an initial plan to replace it, but CB Civil worked with the design and project teams to develop a solution that avoided entering the natural area. Instead, the network was regraded and upgraded around houses and roads, including new lines installed by microtunnelling to depths of up to seven metres. CB Civil regional manager Danny Kayes says the work required deep excavation and tunnelling pits, open-cut excavation, a pump station and new pipework connecting the bulk network into individual properties. “It was a mixture of residential drain line all the way to the more complex, the most complex you can kind of get,” Danny says. Access was one of the biggest challenges, with much of the work carried out in high-density residential areas and beside existing homes. Plant selection, methodology and staging became critical, while Hamilton’s perched water tables meant conditions could change sharply over short distances, making tunnelling particularly difficult. The project also included a connection to the Eastern Interceptor, the large bulk wastewater main feeding the Pukete treatment plant. CB Civil completed the first tie-in of its kind to the interceptor, creating a reference point for Hamilton City Council’s future work on the network. A dedicated team was formed for community communication and engagement, with CB Civil staff doorknocking, speaking with residents and stakeholders and working alongside council’s communications team. Weekly meetings and small gestures such as dropping off toy diggers and chocolates were part of the effort. “We created a really good working team.” The project began in December 2024 and comprises five stages. The first four larger stages were substantially complete by July, while stage five is being finished with residential pump stations. These prefabricated polyethylene tanks collect wastewater from low-lying houses and pump it to the road and into the new network. For CB Civil’s Waikato team, the project builds on previous deep and complex wastewater work, including the Northern Transfer Main, while adding the challenge of working directly beside people’s homes. “It was a big skill set for our guys to be able to do all of that bulk work and do it all well, but then also be really conscious and caring of the neighbourhood as well.” CB Civil employs about 35 people in Hamilton and about 160 across the business. Danny describes the company as values-driven, with care, courage, integrity, partnership and passion underpinning its culture, while training includes additional tickets, water technician courses, apprenticeships and concrete construction courses.
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