In March 2017, Far North District Council contracted United Civil to complete works on the Kerikeri Wastewater Scheme’s sewage reticulation upgrade and expand the existing wastewater reticulation area.
This project’s geo-technical conditions were varied; ranging from soft topsoil areas through to solid rock and large boulders.
The majority of the pipe network was directionally drilled rather than open trenched, to limit disruption and impact on property owners and public road users. Most of these directionally drilled pipes were also in close proximity to underground electrical cables, which meant close liaison with Top Energy.
Key features included:
- constructing a gravity sewer pipework in the public highway, together with gravity connections from private property to the main sewer
- constructing pressure sewer pipework and connecting pipes in the public highway
- installing pressure sewer pump units and connecting pipes on private land
- decommissioning, cleaning and demolition of OSDs
- electrically connecting pressure sewer pump units to private domestic electrical supplies
- constructing new sewage pumping stations and rising mains
- upgrading to existing sewage pumping stations
- installing over 26km of pressure sewer pipe, ranging in size from 40mm to 250mm diameter
- connecting 320 properties with private pumping stations to replace their septic tank systems and a further 20 properties connected to the system via gravity pipes
- installing 7km of 100mm PVC ducts for communication and electrical purposes
- an integrated communications plan implemented across numerous stakeholders, together with comprehensive quality assurance and environmental management e.g. letter drops were made to all residents five days prior to works commencing.
Quality and safety were prioritised at every turn. Pressure testing was undertaken on every pipeline and we worked closely with the Council to ensure highest quality traffic management.