Construction of 465ML Colac Basin No. 5 which was delivered under the stringent OH&S, quality and environmental requirements of Barwon Water. Works included placement of zoned fills (zone a and b materials), filtration layers and gravity support sections; Installation of numerous concrete structures (including an eleven meter high outlet structure); Installation of extensive DICL pipework and associated fittings ranging from 150-600mm diameter; Installation of a suspended steel gantry way and associated structural steel works; Placement of geosynthetics and lagoon rock lining; Completion of stringent geotechnical testing; and Electrical control work.