Quotation Specification
Council of the City of Gold Coast
ABN 84 858 548 460
cityofgoldcoast.com.au
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Key Information
Contract Number:
LG314/1211/16/082
Contract Title:
Sludge Drying Bed Replacement At Coombabah Sewage Treatment Plant
Background Information
Coombabah Sewage Treatment Plant (STP) has eighteen sludge drying beds which provide significant cost savings on sludge
disposal.
Technical Data:

Considering the sludge wet volume of approx. 150 tonnes/day x 30 days - the required capacity of drying beds is 4500
tonnes

The quantity of sludge spread by the operators is about 100 - 150 tonnes per drying bed

Currently 17 drying beds available: 150 x 17 = 2550 tonnes
The original drying beds were constructed on 100 to 150mm thick unreinforced concrete slab. After a few years of usage of the
drying beds, the concrete slab cracked and the water seeps into the foundation and allowing the slabs to subside.
With relation to drying bed number sixteen, the damage progressively became greater and currently the bed is not being used.
The replacement of drying bed number sixteen would provide additional 150 tonnes/day of sludge disposal and it would be
beneficial to the plant to utilise all existing drying beds.
Scope of the Work
The provision of all materials, plant, equipment and labour and the performance of all operations of whatever kind necessary to
replace the sludge drying bed No.16, including but not limited to the following:
Section 1: Preliminaries

Submission of pre-start project documents

Site establishment.
Section 2: Preparation Works

Removal of top 40 mm of asphalt surface from the entire area of sludge drying bed No. 16. The underlying concrete
pavement base surfaces must be mechanically broomed to remove all loose material from the surface.

Disposal of this material to licenced waste management facility.
Hold Point 1

The Contractor must notify the Superintendent that the exposed concrete surface is open for inspection.
Section 3: Construction Works

Break out of remaining existing unreinforced concrete pavement base preparation.

Removal of all existing unreinforced concrete pavement bases and additional asphalt designated by the Superintendent for
removal from site, as specified.

Excavation to stockpile, trimming and compaction of subgrade material to specified subgrade level.

Upon the removal of all unreinforced concrete pavement bases within the bed, the Superintendent must determine the
extent of underdrainage refurbishment works in the bed.
Hold Point 2

The Contractor must notify the Superintendent that the exposed subgrade surface is open for inspection.

The Superintendent must inspect the exposed subgrade and underdrains to assess the cause of failure and, give notice to
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the Contractor, of the location of each section of underdrain to be replaced.

The Work includes supply, placement and compacting of sub-base to finished levels and replacement of gravel filter
material to top of slab level where displaced during base excavation and construction.

The Superintendent will assess condition of the existing drain pipes and if required direct their replacement under the
provisional item works.
Section 3: Construction Works (continued)

supply, placement and compact new sub-base material.

Supply and install specified sub-base material, supply, pour, compact, finish and cure concrete.

Clean out gravel filter material to underdrainage and replace drainage pipes if required (see Provisional Item)

Supply, place and compact imported corrector sub-base material.

Supply, lay and compact hot no fines asphalt surfacing for finished surface.
Section 4: Contract Completion Works

Commissioning of refurbished sludge bed 16.

Submission of As Constructed information.

Demobilisation.
Section 5 - Provisional Item - Underdrain pipes replacement work

The Superintendent will assess condition of the existing drain pipes and if required issue direction for their replacement as
described under the provisional item.

The careful excavation of existing contaminated gravel filter material from the sections of underdrainage, designated by
the Superintendent for refurbishment, to an approved stockpile site. All care will be taken to not disturb the existing
earthenware (vitrified clay) agricultural drainage pipes.

Supply and replacement of gravel filter material to subgrade level including the placement of impervious sheeting material
protection to all exposed underdrain side walls.

The trimming back of underdrain sidewall to achieve firm subgrade, removal of excavated subgrade material from site and
supply of filter material replacement to underslab level.

The Contractor must be responsible for the supply and replacement of any underdrain pipe freshly damaged during the
excavation and relaying of the gravel filter material.
Site of the Works
The site of the works is the Sludge Drying Beds located at the Coombabah Sewage Treatment Plant, Shelter Road Coombabah
(UBD Refidex, Gold Coast Section, Map 18, grid C8).
Project Specific
Quality and Standards
The works must be undertaken to the extent identified by the Superintendent and in accordance with the Contract Specification,
subject to the Contract Documents.
The original drawings attached are disclosed only for information of the Contractor, and the Contractor is deemed to have inspected
the site to be fully conversant with all issues affecting the actual constructed works and their condition.
This Specification applies to works included in the Contract.
Works must be undertaken to the Specified Standards.
Unless specifically amended in this documentation, all works carried out under the Contract must be undertaken in accordance with
the requirements of the current edition of the Principal's Standard Specifications and Drawings. This involves compliance with the
following standards relevant to the nominated Contract Works:
•
•
•
Standard Specification SS3 – Clearing & Grubbing for Infrastructure
Standard Specification SS7 – Unbound Pavements
Standard Specification SS8 – Asphalt Surfacing
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•
Standard Specification SS9 – Spray Sealing
If work scope included in this contract is not adequately covered by the above Standard Specifications, then the work scope must
be delivered in accordance with the following standards:
Australian Standards / British Standards / American National Standards / Institute Standards
Current Manufacturer's Standards and Specifications
Where there is conflict between the Project Specification and a Standard Specification or other documents the Project Specification
applies to the extent of the conflict.
Clarification is available during the Contract period from the Contract Superintendent. Any clarification of detail is to be sought prior
to commitment of any expenditure on that detail and in sufficient time so as not to incur delay to the critical path of the Programme
of Works based on a three-day response.
Accuracy of information
The Principal does not represent that any information made available to the Contractor shows completely the existing site
conditions as it may contain errors, omissions or be misleading. The Principal is not responsible for any interpretation, deductions
and conclusions made by the Contractor from the information made available and the Contractor must accept full responsibility for
any such interpretations, deductions or conclusions.
The information is made available to inform the Contractor of the Principal’s investigations and the Contractor must, in formulating
his working methods and programs, assess the information contained in the documents and make allowance for such assessments.
Supervision by Contractor
The Contractor must provide a full time on site competent and experienced technical representative, acceptable to the
Superintendent, for the duration of the on-site works directed under the Contract. Full details of the proposed representative,
including contact telephone numbers, must be notified in writing to the Superintendent for approval prior to commencement of the
project.
Attention is drawn to Clause 25 of AS 2124 which requires that the Contractor’s Site Representative must personally supervise all
works undertaken under this Contract at all times.
Any proposal to change the nominated representative during the Contract period must be subject to the prior approval of the
Superintendent, with full details of the alternative representative to be submitted to the Superintendent for review and approval.
Site issues
The Contractor must provide list of all of his staff including all sub-contractors and personnel working within the Coombabah
Sewage Treatment Plant during the Contract. Plant/area induction will be Contractor's responsibility.
Work site possession will be provided to the Contractor.
Work site control will be the responsibility of the Contractor.
Site access authority: site has after hour alarms/restricted access/sign in requirements
Interference with SCADA network equipment is NOT permitted.
Use of power is available on site by arrangement with the Principal.
Environmental compliance will be the responsibility of the Contractor.
Quality System Compliance will be the responsibility of the Contractor.
Existence of utility services is not known to the Principal.
Location of utility services will be the responsibility of the Contractor.
Risk associated with Gold Coast Water infrastructure will be the responsibility of the Contractor (to obtain from the Plant/ Area
Supervisor prior to works).
Refuse material disposal from the site will be the responsibility of the Contractor to dispose of legally off site.
Site disruption & stakeholder’s involvement will be the responsibility of the Contractor to coordinate and communicate with the
Superintendent.
Road closure will be considered to facilitate construction.
Traffic control will be the responsibility of the Contractor.
Existing utilities
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Where public utilities or other Council facilities and/or equipment, whether overhead, at the surface, underground or in conduits,
exist at the site, or in the vicinity of the site, the Contractor must take all care necessary to protect such facilities from damage. In
the case of any damage occurring to such facilities, the matter must be immediately reported to the Department, Public Authority or
Company concerned and to the Superintendent. In the case of damage to sewage treatment plant equipment and/or facilities, the
matter must also be reported to the sewage treatment plant supervisor.
The cost of any necessary repairs and/or renewals to equipment or facilities damaged as a result of the Contractors activities must
be borne entirely by the Contractor as a deduction from Progress Payments.
Noise Control
The Contractor must take all precautions, considered necessary by the Superintendent, to minimise noise resulting from work under
the Contract.
All equipment and machinery used by the Contractor or his subcontractors outside normal working hours must be driven by electric
power. If the Contractor considers this requirement is not reasonable for a particular instance, he may apply to the Superintendent
for permission to use other means of power. The Superintendent will grant such permission only if he is satisfied that it is not
reasonable to insist on electric power and that the Contractor is taking all reasonable steps to minimise noise.
Storage of Materials
The Contractor must be responsible for the storage of all materials and equipment, both on and off site, so as to prevent damage
and to minimise hazards to the persons, materials, equipment and the environment.
The Contractor must limit the storage of materials on site to the area of the sludge drying bed being replaced unless otherwise
authorized by the Superintendent.
Other than the storage and/or stockpiling of the materials listed above, the Principal will not allow storage of any ancillary materials,
plant or equipment within the Coombabah STP site.
Temporary Water Supply
Where the Contractor requires water from the Principal’s on-site water supply system, the Contractor must only obtain such water
via a metered standpipe supplied by the Principal. A $1,000.00 refundable bond is required for a metered standpipe.
Any water service available from the Principal may not be at a suitable pressure as required by the Contractor. Any additional
works to boost pressure/flow will be at the Contractor’s expense.
The amount of water used by the Contractor will be charged at the fee current at the time of usage - currently one dollar and ten
cents ($1.10) per kilolitre.
If through drought, fire or any cause whatever, a delay occurs, due to cessation or temporary failure of the water supply, the
Principal will not be held responsible in any way and the Contractor must have no right to compensation or to claim for damages on
account of any loss which he may deem to be occasioned thereby.
Access and joint use of site
The Contractor must act and co-operate at all times with the Superintendent and other contractors so as to ensure that no
obstruction or interference to the access to or joint working of the site occurs.
The Contractor is also reminded that Coombabah STP is an operational sewage treatment facility and unrestricted access to all
areas of the plant site is to be granted to the Principals operations staff at all times.
The Superintendent must define the actual areas of the site and the period of possession of the site applicable throughout the
Contract Period. In general possession of the site is limited to the nominated sludge drying bed NO. 16, access ways and storage
areas identified for each issue of work and limited to work periods unless barricaded off when absent from site.
Other areas remain workplaces under the control of the Principal.
The Principal’s Staff and others entering the site of the contract works must be inducted by the Contractor.
Provisional Items
Payment for Provisional Items in the Schedule will only be made for actual work as measured and ordered by the Superintendent.
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Known Hazards
In accordance with the Work Health and Safety Act 2011 the known hazards for this project identified by the Principal are listed
below.
This assessment is not exhaustive and may exclude risks that are typical of work practices. Perform a risk assessment of the
hazards at each work site prior to the execution of the Works.All Public Utility Plant

Trench and other excavations

Personal injury risks

Contaminated and hazardous materials

Operating Equipment

Traffic

Existing services plant

Self, employee and public injury

Gold Coast Water has utility services and plant on many of the Gold Coast Water sites and it is necessary to source this
information from the providers (including Gold Coast Water) prior to any interference.

There may be physical injury and microbiological contamination of persons coming into contact with the wastewater if the
works are not properly managed or controlled by the Contractor on site, or if personal hygiene procedures are not followed.

There may be electric shock / burn injuries if the Contractor on site does not observe the organisational / statutory
requirements for the works.

There may be manual handling injuries to the Contractor’s employees if the Contractor on site does not comply with the
Queensland Workplace Health & Safety Act and any specific manufacturer’s installation procedures are not followed.

There may be chemicals, gases, heat and dangers working near and / or adjacent to on site structures e.g. aerated water,
digesters, chemical dosing buildings, etc that may cause injury / harm to the contractor’s employees.

The construction site may be contaminated and it is the Contractors responsibility to obtain such information.

The Contract works are located in an identified slip risk area and specific safety precautions must be undertaken.
Statement of Requirements
Construction Limitations
The Registered Gross Vehicle Mass of any Plant traversing the surface of a sludge drying bed must not exceed 10 Tonne unless
otherwise approved by the Superintendent.
Survey
Standard Australian Height Datum and a truncated version of Australian Map Grid is the basis of all levels and coordinates
associated with the works unless otherwise indicated on specific Contract Documents.
The Contractor is responsible for setting out of the works from the PSM’s, and a qualified Engineering Surveyor is to be engaged to
do the set out. The Contractor is not to rely on set out points as placed by the Principal.
General Restoration
Where indicated on the drawings or Schedule of Rates, the term Restoration or General Restoration must be defined as per the
Standard Specifications.
The site is to be fully restored to its original condition as far as is practically possible.
"As Constructed" Information
On completion of the works, “As Constructed” versions of all drawings and specification changes are to be supplied in a format
approved by the Superintendent. All such "As Constructed" documents must include details of any variations ordered during the
Contract period.
Inspections and Testing
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The Contractor must give sufficient notice to the Superintendent to enable any materials or workmanship to be examined prior to
incorporation into the finalised works, and must give sufficient notice to the Superintendent to enable sighting of any test results
required by the Contract or ordering of any test results prior to incorporation of materials or workmanship into the finalised works.
Unless otherwise specified, carry out testing by an approved member of the National Association for Testing Authorities Australia
(NATA).
Warranties
The Contractor must ensure that all warranty entitlements include the Principal and the Contractor as named beneficiaries.
Warranties must be in a form approved by the Superintendent and be provided prior to the issue of a Certificate of Practical
Completion.
Insurance
Insurance specified in the Contract documents must be in place and evidence supplied to the Principal prior to commencement of
works under the Contract. Policies must be maintained throughout the Contract period.
Milestones/Deliverables
Milestones/Deliverables
Due Date
Milestone 1 - Preliminaries
One week after issuing Letter of
Acceptance
1.01 Submission of all safety and pre-start documents
1.02 Site Establishment
Milestone 2 - Preparation works
Three weeks after issuing Letter of
Acceptance
2.01
Removal of the top 40mm thick layer of the existing asphalt pavement
2.02
Removal of additional asphalt to expose the top of the slab
2.03
Disposal of contaminated material to a licenced waste Management facility
Milestone 3 - Construction works
3.01
Removal and safe disposal of debris
3.02
Supply, place and compact imported corrector, sub-base material
3.03
Supply, pour, compact, finish and cure concrete
3.04
Supply, lay and compact hot no-fine asphalt
Within three weeks post completion
milestone 2
Milestone 4 - Contract completion works
4.01
Commissioning of refurbished sludge drying bed No. 16
4.02
Submission of As-constructed information and demobilisation
One week post completion of
milestone 3
Provisional Item 1
5.01 Replacement of subsoil drainage including pipes and drainage media, as required.
Quantity claimable to be verified by Superintendent.
Within 1 week subject to variation
approval
Coordination with Other Works
Responsibility for Traffic Control:
Contractor
Other
Responsibility for Services Locations:
the Principal
Contractor
Other Documentation/Attachments
Attachment A: Technical Drawings
Attachment B: Site Photographs
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