BREAKING NEWS September 25, 2015

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Shamrock Civil Invites Bids to Tender for  – Tyabb Reservoir Renewal – Liner & Floating Cover – Liner Works

Total project value: $20m+

Closing date 01 Oct 2015 05:00 PM AEST

Project site:  Flood Street Tyabb Victoria 3913

Contact:  Daniel Lynch <[email protected]>

Tyabb Reservoir was built in 1978. In 1999 in the control of Melbourne Water the lagoon was lined and covered with a floating polypropylene cover. The floating cover is now approaching the end of its life. The service reservoir is currently not meeting the required levels of service due to water quality and operation maintenance risks. A summary of the works required for the replacement of the cover can be found below. Design, Supply & Construction of Liner & Cover for Tyabb Reserviour

•    Removal of any residual water after the basin has been emptied inclusive of all pumping.

•    Removal and disposal of existing degraded floating cover & liner.

•    Provision of all temporary works including designs and drawings to allow installation and access/egress as required for the installation of the liner cover.

•    Detailed design submission in accordance with specifications W00052 for Tyabb Renewal Project, Design for liner and cover is for a minimum 25 year life span.

•    The detailed design is to take into consideration all access hatches, drainage, access points, walkways. (Melbourne Water have a preference for Ladders, rope ladders or better alternative than any sloping walkways.)

•    Detailed design, supply and construction of underliner drainage system suitable for liner design

• Detailed design to consider provide for a liner leakage rate below the requirements of the specification, report will be required to substiate assumptions.

•    Supply of membrane sheet material shall meet the requirements of Technical Specification for LLDPE Liners appended to this document.

•    Supply of membrane cover material shall meet the requirements of Technical Specification for EIA Covers appended to this document.

•    Welding procedures for the membrane need to be detailed, submitted and clearly follow any requirements within the specifications, as well as QA procedure detailed.

•    Floors and walls should be as smooth as possible to accommodate future suction with a vacuum head for cleaning of reserviour.

•    Supply of all materials associated with the Cover Renewal Works including but not limited to roto-mould floats, pipe flexible hosing, fittings, rope fasteners, restraint caballing, batten bolts, battens, batten seals, ballast material, surface water pumps, submersible water pumps and discharge piping.

•    Works include all cover membranes, primary and secondary ballast, primary and secondary floatation, cable restraint system, surface water drainage, surface water transfer, undercover skirts, cover vents, access ports, wear strips, access ways and perimeter slip control and all associated fittings and components.

•    Fabrication and installation of access ports and associated floatation support, minimum width and length of access hatches shall be 1m and access hatches to rise 200mm above the floating cover. They should be spaced at approximately 50m Intervals. A buoyant working platform of approximately 3m length and width around each hatch.

•    Fabrication and installation of sampling ports and associated floatation support, minimum ports to be 200mm in diameter. They should be located near the conrners of the reservoir.

•    Allow for batten requirements to all inlet, outlet and overflow structures

•    A restraining cable and anchoring system (if required)

•    Design & installation of extension for concrete edge beam including interface detail for existing and new

•    Restoration and possible strengthening of the existing edge beams. Design is to stipulate the loads from covers and anchors along with locations of all fixings on the edge beam.

•    All surface water transfer equipment including power supply and controls, including level control, float switches.

•    Supply of all pumps duty and standby for each sump on the cover.

•    Responsibility for management of temporary works including wind surface water. This shall include temporary ballasting, surface water pumping and forced ventilation of the cover segments during installation and handover.

•    FAT testing of the membranes shall be conducted and submitted.

•    MDR pack including all QA associated with the supply, testing and installation of the membrane sheeting, access ports, poly foam blocks and any other materials & installation works undertaken for the cover. QA documents submitted are to show compliance to all documents listed within Melbourne Water Specifications as well as relevant Australian Standards. All welding qualifications, procedures and testing needs to be submitted within the MDR as detailed within the specifications.

•    As constructed information to be detailed and submitted on all relevant documentation and drawings

•    Preparation of testing and commissioning procedures, O&M manual and maintenance manual and associated procedures.

•    Commissioning of the control system

•    Training of Melbourne Water operators

More Information: Dan Lynch, Ph: 07-3727-1100.
Email: [email protected]

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