Project Overview:
The Kemps Creek Dual Pressure Main project is part of the larger Austral Leppington and Upper South Creek Advanced Water Recycling Centre scheme. The purpose of the project is to improve wastewater services in the South West Growth Area in South West Sydney.
Project Description:
Quickway were engaged by Sydney Water as the Principal Contractor to undertake the Design and Construction of the project which is part of Sydney Water’s Major Project works. Scope includes:
- Design development and constructability reviews for all pipelines and infrastructure from 80% detailed design to IFC. This design was completed with our design partner, WSP.
- Over 16km of Trunk pipeline construction, including OD800PE, and DN600 GRP, to transfer flows from Austral-Leppington network to the new Upper South Creek Advanced Water Recycling Centre.
- The works also involved significant Trenchless installations, including:
- Large diameter dual HDD bores (each ~ 900 metres in length, and up to 22 metres deep) under the sensitive Kemps Creek Nature Reserve.
- Over 1km of large diameter (DN1200) Micro-tunnel bores.
- Additional scope included:
- Service and geotechnical investigations
- Temporary Works Design for all works, including crossings adjacent to dam structures)
- Water Hammer/Transient Analysis
- Condition Surveys
- Procurement of pipe & fittings, concrete and all quarry materials
- Community & Stakeholder Management (with SWC)
- Development of Easement and Acquisitions Plans for access to the construction alignment, through properties/land.
- Traffic Planning/Management
- Environmental & Quality Management
- Connections works to SPS 1211 Pump Station and the major Upper South Creek AWRC.
- Progressive testing and commissioning of the pipelines
- Permanent Restorations (including landscaping, road reinstatement, and concrete driveways).
Key Challenges/Highlights:
- Design: Following novation of the design from Sydney Water to Quickway, we were required to develop the design from 80% to IFC, in partnership with WSP. The design was completed to a high quality and 1-week ahead of program. This is relevant as Quickway have the capability and capacity to deliver either construct only or D&C projects for Icon Water.
- Scope: includes extensive gravity sewer and pressure sewer mains (> 16km of pipes) construction with different size pipes and types (GRP, PE, and DICL), and concrete structures and assemblies.
- Program: Despite a short timeframe to design, construct and commission the pipelines to enable flows to the USC AWRC facility, Quickway completed the project ahead of program, and to the satisfaction of the client. We are consistently successful in completing projects ahead of program, through the use of detailed planning, engaging with all stakeholders and self-performance of large elements of project delivery (site investigations, survey and 3D modelling, enabling works, open trenching excavation and pipe installation, concrete structures, restoration works, etc.
- Trenchless Works: The project had significant trenchless installations. Among these were the dual large-diameter HDD under the Kemps Creek Nature Reserve, which was entirely inaccessible/off-limits, not even by foot due to restrictions imposed by NSW National Parks & Wildlife. At almost 900 metres in length, and under difficult terrain, these HDDs were very complex and are amongst the longest delivered on Sydney Water’s network. These were completed successfully, without any environmental or safety incidents. We expect trenchless works will be required under the Panel also and believe that this trenchless experience will be valuable to Icon Water.
- Value: although the project is larger than most of the projects expected under the Icon Water NPDP Panel, this demonstrates our capability in delivering a major project for a large government client.
- Complexity: Involves similar (or possibly, higher) complexity than that expected for the Icon Water NPDP Panel, which involved construction of pipeline around existing utilities/assets, working in close proximity to live traffic on a busy roads, and involves constructability review and design development of all design, and working closely with the client for the success of the project.
- Community Management: Quickway’s Community Manager for the project led the community engagement with the community, business owners, and other stakeholders on the project – including Sydney Water, John Holland, Seymour Whyte, West Region Delivery Team, local councils and others.
- Additional works: Based on the excellent working relationship with Sydney Water team on this project, Sydney Water & Quickway direct negotiated the Bonds Creek Carrier Extension (~ $25 Million) project. This demonstrates the trusting relationship and approach between the parties.