Ferrycarrig was engaged by Confluence Water to undertake the Lane Cove Source Control Project. The project involved headwall replacement, ERS chamber replacement, and the decommissioning of the existing discharge structures.
This project is part of Sydney Water’s wider Wet Weather Overflow Abatement Program to assess control measures for reducing stormwater ingress/inflows into the wastewater network.
This source control project will focus on addressing stormwater entry via Sydney Water’s assets such as emergency relief structures (ERS), poor sealing arrangements of backflow prevention devices, maintenance chambers, and cross-connections with Council stormwater networks.
Ferrycarrig was engaged the replace the existing discharge structures with new standard headwalls at three site locations. The works involved:
- Demolition and disposal of existing headwall and pipeline
- Allow for implementing flow isolation, flow management, and any bypass requirements
- Excavation and construction of the new headwalls
- Installation of handrails for all headwalls
- Restoration, re-grading of existing banks around the new headwalls
Ferrycarrig was also engaged to replace the existing discharge structures with new site-specific ERS Chambers at seven project sites. These works involved:
- Demolition and disposal of existing ERS and pipeline
- Excavation and Construction in-situ of the new ERS Chamber and discharge sewer
- Restoration, Regrading of existing banks around the new ERS.
- The works also involved the decommissioning, demolition, and removal of the existing discharge structures at two of the sites.
Key challenges associated with the works included difficult to access site locations that required transportation of materials, plant and equipment by helicopter.
The works involved detailed planning of flow Isolation and flow management in accordance with Sydney Water requirements to enable safe cut over, connection and buildability of the new structures.
The locations of the worksites are near waterways and stormwater gullies. Ferrycarrig implemented stringent environmental controls to prevent any soil erosion and surface water runoff. Works were completed with no environmental incidents.
Ferrycarrig provided value engineering in terms of wastewater flow management methodology, allowing new manholes or chambers to be constructed without risk of overflow and services interruption. The methodologies were tailored for each work site and provided a safe working environment for our crew to complete the confined space activities.