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

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