Hunter Street Water Supply Pipe Renewal

The South Taranaki District Council (STDC) proposes to renew sections of the water supply reticulation network along Hunter Street, Hawera, between Waihi Road (SH3) and South Road (SH45), to address aging asbestos cement (AC) pipelines and maintain required levels of service. The works include the decommissioning, or abandonment of approximately 618 m of existing DN100 AC water mains and the replacement with new DN180 HDPE pipelines. In addition to the main renewal works, rider mains will be installed to service properties where required. These rider mains will be constructed using DN63 HDPE pipe to provide an efficient alternative to individual service crossings. The scope of works includes the supply and installation of all necessary valves, fittings, fire hydrants (PN16 or higher), and service connections, along with integration into the existing network and recently installed valves and fittings to ensure continuity of supply, including maintaining service to critical customers such as the nearby hospital. The new pipelines will be installed using open trenching methods, adapted to suit site conditions, traffic management requirements, and existing underground services. The works also include flushing, pressure testing, disinfection, and commissioning of the new water mains prior to being placed into service. Additional deliverables include full reinstatement of all disturbed surfaces (including roads, berms, footpaths, and pavement markings), and the provision of as-built drawings, asset data, componentisation records, and supporting QA documentation in accordance with Council requirements to support asset management and future maintenance.