Stormwater (SW) Ōtākaro Avon River Corridor Stopbank Anzac Drive to Waitaki Street (OARC)

The Works for this RFT shall include, but are not limited to:SP1 – Anzac to Waitaki Flood Protection:• Sheet‑pile floodwall and embankments – installation of STU2700 sheet piles, core material tie‑ins, toe drains, earth embankments on both sides, and safety barrier along Anzac Drive.• Stormwater and groundwater infrastructure – new gravity reticulation, swales, debris screen structure, stormwater pump station (3 × 0.5 m³/s pumps), northern groundwater pump station, rising mains, distribution chamber, and river outfall works.• Roading upgrades – full reconstruction and raising of Wainoni Road to RL 2.92 m, new shared paths/cycle lanes, sump adjustments, and service relocations.• City to Sea Pathway and access works – 4 m‑wide asphalt pathway on embankment, access tracks, small culvert installations, and tie‑ins to existing routes including Falconwood Grove.• Landscaping and siteworks – ecological planting, reserve works (incl. Jack Hinton Memorial relocation), architectural electrical building, fencing, contaminated soil handling, earthworks, and site reinstatement.SP2 – Waitaki Treatment Facility:• Construction of a stormwater first flush basin that will provide storage and treatment of first flush volume runoff from the adjacent urban catchments.• Construction of twin stormwater treatment wetlands which, in addition to treating stormwater, will provide ecological benefit by providing habitat for birds and other wildlife.• Construction of the final length of the upstream piped connection with associated manholes.• Abandonment of remaining stormwater and wastewater pipes that are in Bexley Road and removal of almost all services that are below the formation level of the stormwater management facility.