Selfs Point STP Upgrade, Tasmania

Location: Hobart, Tasmania, Australia
Client: TasWater CDO (CPB-UGL JV)
Engineer: Menard Oceania
Scope: Installation of 90,000 lm of Controlled Modulus Columns to provide essential support for over 20 tanks and auxiliary structures linked to the STP upgrade.

Project Overview

Menard Oceania is proud to deliver specialist ground improvement solutions for the Selfs Point STP Upgrade, Tasmania’s largest Controlled Modulus Columns (CMC) project to date. Commissioned by TasWater to support the expansion of the Selfs Point Sewage Treatment Plant, our team played a pivotal role in ensuring the facility can accommodate increased flows from both Selfs Point and Macquarie Point catchments.

Ground Conditions & Technical Solution

The Selfs Point site presented complex geotechnical challenges, with layers of undifferentiated fill and landfill overlying natural alluvium soils and basalt bedrock. Historical landfill, dating back to 1930-1963, included municipal solid waste, trade waste, building rubble, and other materials. Menard’s innovative approach involved installing CMCs to enhance soil load-bearing capacity without disturbing the landfill, and deploying offset columns in areas with obstructions.

Sustainability & Environmental Impact

Menard is committed to sustainable development. For the Selfs Point STP Upgrade, we used approximately 12,444 m³ of lower-carbon concrete, resulting in the avoidance of around 1,000 tonnes of CO₂e emissions. Our team achieved outstanding results in Quality, Safety, and Environment (QSE), with a remarkable 93% client satisfaction rating from TasWater CDO (CPB-UGL JV).