Kyogle Off-Stream Storage – Landslip Remediation and Sludge Lagoon Construction

Remediation of two landslips on the riverbank below the Kyogle Off-Stream Storage facility and the demolition of two sediment ponds and construction of one replacement concrete-lined sediment pond.

Project goals

The purpose of the works is to protect the Kyogle Off-Stream Storage facility from the impact of three landslips on the steep riverbanks below the facility.

Scope

• Sludge ponds
• Completion of design
• Contractor to determine if a temp access road is needed to avoid a landslip, if it is, construct the temp access road
• Demolish the two existing sludge ponds and construct a replacement sludge pond, ensuring that the Council can pump water to the main pond during the works
• Removal of all water and sludge from the two existing sludge ponds, transport to the Kyogle Sewerage Treatment Plant, and placement within a bunded location, pre-prepared by the Council. The Council will lawfully dispose of the sludge at a later date
• Construction of one concrete-lined sludge pond and forebay
• Test excess material and lawful disposal
• Road construction
• Perimeter fence construction
• Landscaping

Slips B and C

• Completion of design
• Construction of two temp roads to access the slips by progressively installing screw piles, concrete block walls, concrete, culvert pipes and rock
• Install sheet piles into the river to assist in dewatering the toe of the bank, pump water from the bunded area, and removal of sheet piles when no longer required
• Removal of vegetation and lawful disposal
• Progressively install geogrid, aggregate, rock, and concrete blocks to retain the land surrounding the slips
• Once the slip remediation works are complete, leave the screw piles, concrete block retaining walls, and concrete slabs within the temporary roads, remove the aggregate surfacing, cover with excess fill, topsoil, and grass seed
• Landscaping

Related files

• 1 - RFT-2011186 - GC21-edition-2-Title-Page_08042024.pdf (250 KB)
• 2 - RFT-2011186 - GC21-edition-2-Conditions-of-Tendering_12082024.pdf (400 KB)
• 4 - RFT-2011186 - GC21-edition-2-General-Conditions-of-Contract_01102024.pdf (1574 KB)
• 5 - RFT-2011186 - GC21-edition-2-Preliminaries_12082024.pdf (557 KB)
• 6 - RFT-2011186 - General Requirements.pdf (3689 KB)
• Appendices.zip (713290 KB)
• Drawings.zip (76687 KB)
• Specification.zip (3861 KB)

Additional details/instructions

Pre-Tender Meeting

A non-mandatory pre-tender meeting is proposed for:

• Date: Tuesday 25/11/2025
• Time: 10:00AM - 12:00PM
• Location: 66-80 MacDougall Street, Kyogle NSW 2474

Google link: https://maps.app.goo.gl/C1aBaHCWhLsuG8Xy9

You must register your interest in attending with the RFT Contact, Richard Greenhill, at richard.greenhill@pwa.nsw.gov.au at least 3 business days prior to the meeting.

Supplier Account

Suppliers must have a Supplier account on Supplier Hub to download and lodge responses. To create a Supplier account please go to https://buy.nsw.gov.au/login/signup.

Notifications

To receive notifications about this opportunity (addenda etc.) suppliers must save the opportunity to their dashboard or start a draft response.

Lodge a Response

Click the RESPOND button. Suppliers must submit their response into the buy NSW system before 3pm on the close date. Responses can be submitted and edited multiple times until the opportunity closes, with only the most recent submission being submitted. Allow at least an hour before the tender closes to complete your submission, upload documents, and contact support if needed. File upload time depends on supplier’s internet speed. Files are virus scanned and encrypted once uploaded. Suppliers are encouraged to upload early and wait until the upload bar completes.

For help submitting a response, contact 1800 679 289 or buy.nsw@customerservice.nsw.gov.au.

DO NOT email your response to the primary contact as it will not be accepted.