Primary Sedimentation Tank 8 Rehabilitation
Client
Melbourne Water
Location
Eastern Treatment Plant
Sector
Type
Duration
9 Months – October 2019 to July 2020
Key Facts
- The Primary Sedimentation Tanks (PST) at the Eastern Treatment Plant (ETP) have been in continuous operation since commissioning in 1975.
- Primary Sedimentation tanks are used in the primary treatment stages of sewerage treatment process.
- During routine maintenance of PST8 significant cracking was observed in and around various concrete structures.
- The main structural components of the tank Include: reinforced concrete (RC) floor and walls, square RC columns, walkway beams, and tie beams.
Background
Rehabilitation of Columns and other structures needed to take place in a safe manner with limited disruption to the operations of PST8 and adjoining facilities. Purpose of the Rehabilitation work was to mitigate the risk of asset collapse within the PST area.
Scope of Service
- Earthworks required to create a wetland within the premises
- Install a Stormwater Drainage System
- Connect stormwater drainage system to the Wetland
- Install paved footpaths around the facility and MOS pipe
- Construction of feature wall at the Cocoroc Precinct entrance
- Upgrade existing grounds to create a safe environment for school tours
- Planting of shrubs and trees within the premises
- Seating arrangement for visitors
Safety
Working from heights were managed through innovating a rolling platform on the roof, thereby eliminating live edges while giving full access to site crew for coating application.
Environment
Works were carried out with controls in place to ensure no hazardous liquid could not enter stormwater system on site.
Stakeholder Engagement
All works were carried out in coordination with Operations team at Eastern Treatment Plant and Major Capital Delivery team.