utilities - three waters

Contract Works

• The pond was constructed from both excavation and construction of compacted earth embankments. 

• Supply and install HDPE liner for the buffer pond and associated materials for the liner protection and gas venting.

• Construction of Irrigation Pump Station

• Construction of DN1800 precast concrete wet well manhole with pumps

• Construction of valve chamber

• Supply and installation of Huber Ro9 wastewater screen and construction of a concrete channel and surround

• Electrical work associated with the wastewater screen, new pump stations, control system and connection to SCADA

Drainage

The contract included construction of a series of new pipelines to convey wastewater around the site.  Supply, welding, trenching, connecting/redirecting, bedding, testing and ancillaries were required to construct the pipelines.  Including:

• Gravity stormwater pipe from existing open drain to the Waikari River. 100m long – DN450 StormBoss SN8 pipe

• Perforated dewatering pipe within gravel trench. 118m long – DN150 Novaflow

• Gravity dewatering pipe from new pond gravel trench to the Waikari River.  60m long – DN150 PVCu SN8 pipe.

• Gravity transfer pipe from the existing buffer pond to the new Transfer Pump Station.  17m long – DN225 SN8 PVCu Novadrain pipe.

• Suction pipework from the existing buffer pond to the new Irrigation Pump Station.  30m – 160OD PE100 SDR13.6 pipe and NB125 SCH40 316 stainless steel pipe.

• Suction pipework from the new buffer pond concrete trough to the new irrigation pump station.  45m long – NB125 SCH40 316 stainless steel pipe.

• Pressure pipe from the transfer pump station to the new 20,000m3 buffer storage pond via new valve chamber. 15m of NB 80 SCH40 316 ss pipe.

• Pressure pipe from the irrigation pump station pump to the tie-in point with the existing irrigation pipework.  120m long – 125OD PE100 SDR13.6 pipe.