Christchurch City Council (the Council) is seeking Expressions of Interest (EOI’s) from suitably qualified contractors (Respondents) who are interested in constructing the new WW Grassmere Wet Weather Storage Facility.

The scope of works include the construction of a new 3,400m3 storage tank upstream of the Grassmere sewer overflow (PS1/21) to provide attenuation of wastewater in the Northern Relief catchment during rain events. The storage facility will include a diversion chamber, pump stations, a storage tank and odour management. The purpose of constructing the storage facility is to reduce raw wastewater discharges to the Dudley Stream Diversion during wet weather events in accordance with the Council’s city-wide consent.