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WaterPlan 2050 is the long term water supply strategy for the Central
Coast.
The Mardi-Mangrove Link Project is a key element of WaterPlan
2050 and will help to secure the region's
water supply over the next four decades
by linking Wyong River to Mangrove Creek Dam, via Mardi
Dam.
The purpose of the project is use
Mangrove Creek Dam to store water, obtained
in periods of higher river flow for return to Mardi
Dam when water storage levels there are
low. This will be achieved through:
•
improved harvesting of water flows in the
Wyong River;
•
storage of this water in Mardi Dam, until
its capacity is reached;
•
transfer of further 'surplus' water to
Mangrove Creek Dam for storage; and
•
transfer of stored water from Mangrove
Creek Dam to Mardi Dam under gravity (and
onwards to the Mardi Treatment Plant) when needed during drier periods.
The project is an initiative of Gosford
City and Wyong Shire Councils with Australian
Government Water Smart Program funding
of $80.3 million.
Wyong Shire Council
is the lead Council in the procurement
of services for the project.
This Notice
provides introductory information relating
to compliance and accreditation requirements for entities considering
tendering for the role of Construction
Contractor for the Mardi - Mangrove
Link Project. 
Scope of Project
The overall Project includes the following capital works:
| Wyong River Off-take Structure |
A new water off-take, near the site of the existing structure, capable of extracting up to 500ML/day from the lower Wyong River |
| Wyong River Pumping Station |
A new pumping station to extract water through the Wyong River Off-take Structure, with an installed capacity of 320ML/day |
| Wyong River to Mardi Dam Rising Main |
A new rising main, approx 2.6km long and 1000mm diameter, to transfer water from the lower Wyong River to Mardi Dam |
| Mardi Dam Inlet Upgrade |
A new inlet to Mardi Dam to take the flow from both the Wyong River to Mardi Dam Rising Main and from the Mardi to Mangrove Transfer Rising Main |
| Mardi to Mangrove Transfer Pumping Station |
A new pumping station to pump water from Mardi Dam, through the Mardi to Mangrove Transfer Rising Main, to Mangrove Creek Dam at a rate of up to 160ML/day |
| Mardi to Mangrove Transfer Main |
A new pipeline, approximately 19km long and 1000mm
diameter, linking Mardi Dam with
the end of the existing Boomerang
Creek Tunnel (which leads to Mangrove
Creek Dam) It will
have a capacity of 160ML/day and
will permit flow in either direction
according to operational needs. |
| Boomerang Creek Inlet/Outlet |
Modifications to the existing outlet structure in the Boomerang Creek arm of Mangrove Creek Dam to allow it to operate as an inlet / outlet structure |
| Lower Wyong Weir and Fishway |
Modifications to the existing weir and fishway (downstream of the Wyong River Off-Take Structure) |
Procurement
The Project is being delivered in five phases:
| Preliminary Phase |
Covers the period during which the concept of the Project was developed and a Professional Services Contractor was engaged to undertake the majority of the design and approvals work
This phase is complete |
| Design and Approvals Phase | The engineering and environmental investigations, pipeline route definition work, and design of the capital works
The obtaining of statutory approvals and call for Expressions
of Interest. This is the current
phase of the project (as at June
2009)
|
| RFT Phase |
The issue of a Request for Tenders for the Construction Contract, and the subsequent receipt and evaluation of tenders
The obtaining of relevant approvals
to execute a contract(s) with the
preferred tenderer (s) |
| Construction Phase |
The construction and commissioning, by the Construction Contractor, of the Project capital works (including site remediation and restoration, and associated post-Completion defects correction, for the pipeline corridors)
The acquisition of pipeline easements (by Wyong Shire Council) |
| Operations Phase |
The operations of the water supply and storage infrastructure
by the Gosford and Wyong Councils' Water Authority |
Scope of Work for Construction Contractor(s) during Construction
Phase
The Scope of Work that the Construction Contractor(s) will be responsible
for will probably include:
- procurement of materials;
- limited design development (to accommodate local conditions);
- construction of capital works and integration with the overall
water supply system;
- site restoration; and
- commissioning of capital works.
Skills likely to be needed by the Construction Contractor
To deliver the above Scope of Work, the following skill areas are
likely to be required:
- surveying
- materials procurement (including pumps, large and medium diameter pipes, valves, electrical switchboards and transformers, motors, VSDs)
- mechanical, electrical and SCADA installation, testing and commissioning
- hydro-testing and pipeline commissioning
- system testing and commissioning
- marine and sheet piling and associated works, cofferdam construction
- caisson construction and sinking
- river bank protection works
- large diameter pipeline installation (on and below ground, over and under water)
- continuous trenching and shoring
- large diameter pipe welding
- scour protection works
- underboring / microtunnelling
- structural steel fabrication and erection
- spoil management and disposal (including, potentially, contaminated soils)
- ground dewatering
- diaphragm wall or secant pile construction
- major reinforced concrete construction (including water retaining structures)
- mechanical installation of pumps and valves, drive alignment
- building work, including masonry construction, roofing, fit-out
- minor access road construction and provision of temporary bridging (for construction traffic)
- traffic management
- pipeline corridor restoration and landscaping
Mandatory Criteria
Wyong Shire Council has not yet determined the extent or nature of the mandatory (or desirable) criteria that it will assess before selecting a preferred tenderer; these will be advised in due course. However, entities wishing to be considered for the role of Construction Contractor should note the following:
- the Australian Government Implementation Guidelines for the National Code of Practice for the Construction Industry (reissued June 2006) will apply; and
- entities must be accredited under the Australian Government Building and Construction OHS Accreditation Scheme, established by the Building and Construction Industry Improvement Act 2005
At the time, entities must have workplace arrangements in place
that comply with the Australian Government
Implementation Guidelines for the National Code of Practice for the
Construction Industry.
Additionally, at the time of lodging an Expression of Interest,
entities must be accredited under the Australian
Government Building and Construction OHS
Accreditation Scheme. Note that the Scheme
requires accreditation at the time of Contract
award (and during construction) but time
is of the essence and it has been decided
that confirmation of this accreditation
will be required by Tender lodgement date.
Intended Timeline
The following timeline is provided as a guide only (and may change
depending on the timeline for a decision
being made regarding sections of the route
of the Mardi
Mangrove Transfer Rising Main) The timetable is current as at
June 2009:
| Issue expressions of interest |
July 2009 |
| Period to submit expressions of interest |
3 weeks |
| Issue request for tenders |
late 2009 |
| Contract award |
early 2010 |
| Project completion |
mid 2011 |
Further information
General information regarding the Mardi-Mangrove Link Project is available on this website by clicking here.
Wyong Shire Council does not intend to provide any further expansion
on the information contained in this Notice,
other than clarification of perceived ambiguities.
Entities interested in becoming the Construction
Contractor are advised to wait for the release
of the call for Expressions of Interest
documentation.
Point of contact
The point of contact for any enquiries relating to the content of this Notice is:
Kimberly Bushnell
Project Administrator
Mardi-Mangrove Link Project
PO Box 20
WYONG, NSW 2259
Email: mardimangrovelink@wyong.nsw.gov.au
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