Apex Water were engaged to design and construct a new wastewater treatment plant on a greenfield site in the Cardrona Valley to service the Cardrona Village, Cardrona Alpine Resort and a new residential and commercial development. A key design consideration was the treatment of peak wastewater volumes during winter when temperatures can be extremely cold.This turnkey project involved considerable earthworks to enable construction in an old quarry, the construction of partially buried treatment tanks and a building to provide spaces for electrical equipment, process plant, dewatering equipment and staff amenities including a control room and laboratory. The treatment process is a sequencing batch reactor (SBR) to provide a high level of flexibility with seasonal loads, with UV treatment prior to discharge via a land treatment area. Site landscaping, fencing and driveways were also completed.Despite COVID 19 disruptions, the plant was completed on time and has now been vested in Queenstown Lakes District Council. Apex staff are now operating the plant for a 3-year period and remote access systems allow remote supervision.