Tender Number: T02-2021 Closing Date: 5:00pm Wednesday 17th March 2021 - Clare and Gilbert ...
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Request for Tender for the Construction of
Wastewater System Upgrade at Auburn
Recreation Ground.
Tender Number: T02-2021
Closing Date: 5:00pm Wednesday 17th March
2021
Clare & Gilbert Valleys Council
4 Gleeson Street, Clare
Ph: 8842 6400
admin@cgvc.sa.gov.au
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Invitation to Tender
The Clare & Gilbert Valleys Council invite tenders for the Construction of a
Wastewater System Upgrade at Auburn Recreation Ground.
Background
The calling of this tender is in response to Council’s responsibility to meet its
procurement requirements as part of the Clare & Gilbert Valleys Council 2020/ 21
capital works budget.
Wastewater management at Auburn Recreation Ground has relied on an existing
Aerobic treatment unit which is undersized especially during peak season. Council
requires an upgrade of the system to adequately manage current loads and to
provide additional capacity for future growth.
Specifications
1.1 Contractors are invited to submit a Schedule of Rates for the
Construction of a Wastewater System Upgrade at Auburn Recreation
Grounds in compliance with the attached Technical specification
documents.
1.2 Tenders shall include a Breakdown Schedule of Rates for all elements of
construction. (e.g. $ per m2, lm…)
1.3 The Technical Specification and drawings prepared by Water
Technology provide comprehensive technical and construction details
and include site information, detailed drawings, soil bore logs and the SA
Health approval for the design.
1.4 Contractor to provide all traffic management requirements including
temporary fencing / barriers etc. and ensure traffic management plans
and setup are in accordance with AS1732 WZTM regulations.
1.5 The contractor must liaise with recreation park management, adjoining
property and business owners regarding the timing of the works to
ensure minimal disruption. (Night or after hours works may be required)
1.6 Tenders shall be submitted electronically to the following email:
admin@cgvc.sa.gov.au or via SA Tenders and Contracts by 5.00pm
Wednesday, 17th March 2021.
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Selection
Contractors shall comply with Clare & Gilbert Valleys Councils Contractor
Management and WHS systems.
The Council reserves the right to select Contractors based upon;
− Contract price.
− Contractor availability at time of work offer.
− Contractors proposed project management plan (PMP)
− Contractors demonstrated qualifications and experience.
− Performance based criteria; including contractors previous works for Council
or previous similar wastewater management system works with local or state
government.
− Contractor’s willingness to comply with all terms of the Tender, Council
policies and procedures.
A selection criteria matrix that will be used in the contractor selection process is
attached.
The successful Tenderer will be required to complete Councils induction process for
preferred contractors.
Timing
The Works are required to start by 30th April 2021 and to be completed within 4
weeks. If any contractor is only available to work before or after the proposed
timeline, please submit your tender with proposed work schedule to be considered
by Council.
A detailed project management plan is required to be submitted with the tender
and will form a key part of the selection criteria.
A site inspection with Council staff and Water Technology will be arranged on
Tuesday 9th March 2021 at 11am. All tenderers are invited to attend and a pre-
booking will be required which can be made through admin@cgvc.sa.gov.au.
Questions and requests for clarification can be submitted to admin@cgvc.sa.gov.au
by Wednesday 10th March 2021 at 5pm. Answers will be shared with all tenderers via
email on Friday 12th March 2021.
Tenders shall be submitted electronically to admin@cgvc.sa.gov.au or via SA
Tenders by 5.00pm Wednesday 17th March 2021.
Site Review and Set out
The Contractor is deemed to have visited the site during the Tender period to
ascertain local conditions and the works involved. No claims for extra payments will
be considered on grounds of lack of knowledge of the actual site, the scope of the
Works or of the conditions under which the Works are to be executed.
The Contractor shall familiarise itself with the availability of temporary access,
temporary lighting and power, telephone services, water supply, waste disposal
facilities, labour supply, weather conditions, etc. and make allowance in its
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quotation for provision of any services required to enable the Works to be
performed.
The Contractor shall ensure that all plant, equipment, materials, temporary
workshops, stores and offices are kept within the confines of the site. The cost to
provide the Contractor’s temporary power, water and any other services required to
execute the works shall be borne by the Contractor.
The Contractor shall be responsible for:
− All matters relating to the establishment of site facilities to service the works in
accordance with the WHS Act.
− Securing and maintaining site facilities in a clean and orderly condition and in
a satisfactory state of repair.
− Any losses occurring from the site.
− Delivery of all materials used in the works and allocating sufficient storage
space for same.
Where the Contractor has commenced any component of the Works, it shall be
deemed that the Contractor has reviewed all dimensions and has accepted
responsibility.
The Contractor shall reinstate any infrastructure or road furniture which may have
been disturbed or damaged by its work. In any doubt, prior to start work consult with
the Superintendent.
Project Management
The Contractor shall prepare a comprehensive Project Management Plan (PMP) for
the works incorporating a detailed work method statement outlining how the
Contractor proposes to carry out the works.
The PMP shall clearly address the following items:
− Work, Health and Safety management
− Quality control processes
− Environmental management plan
− Traffic Management plan
− Detailed Construction Program with daily and weekly milestones – (MS Project
format preferred)
− Communication plan
A detailed draft PMP shall be included in the Tender response and will be a key
component of the tender evaluation.
The Contractor shall submit to the Superintendent a copy of the Final PMP within ten
working days of contract award and prior to taking possession of the site.
Traffic Management
The Contractor shall provide for the continuous operation of normal traffic and
pedestrian movements along all roads, and pedestrian and vehicular access to
properties included in or affected by the Contract. The Contractor shall, where
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necessary, provide and maintain side-tracks to the satisfaction of the Superintendent. The Contractor shall prepare and submit to the Superintendent as part of its PMP, detailed Traffic Management Plans to cover all works in accordance with all relevant legislation, regulations, guidelines, codes of practice and Australian Standards. The Contractor shall be responsible for the safety of all pedestrians and vehicular traffic at or adjacent to the site of the Works, or in any way affected by the execution of the Works. Notwithstanding any action that the Superintendent may take in this regard, the Contractor shall be liable for damages arising out of any accident in connection with the carrying out of the Works. General Construction The Contractor shall act in compliance with all legislation, regulations, codes and industry guidelines applicable to all works and provide all required notices and pay all required fees, evidence of which shall be submitted to the Superintendent. All works shall be carried out in accordance with the Specification and Drawings, the applicable Australian Standards and Codes. In the absence of any details provided in the aforementioned documents the Contractor shall provide details of alternative recognised standards including but not limited to Department of Planning, Transport and Infrastructure (DPTI) Institute of Public Works Engineering Australia (IPWEA), Engineers Australia (EA) and/or manufacturer’s recommendations. The Contractor is fully responsible for choosing the appropriate plant, equipment and work methods for the purpose and environment for which they are to be used. The Contractor shall be fully responsible for the construction of the works and ensure that acceptable work practices are used. Completion On completion of the works, the Contractor shall remove all rubbish, debris, surplus materials from the site of the works. The site shall be left in a neat and tidy condition to the satisfaction of the Superintendent. Any land contaminated through the occupation of the site by the Contractor will be remedied to the satisfaction of the Superintendent. The Superintendent will inspect the site at the conclusion of the contract. Any outstanding clean up works required to leave the site in a satisfactory condition that is not carried out by the Contractor will be completed by others and the cost of that work will be a charge levied against the Contractor. 5|P a g e
Pricing Schedule Price payable by the Council for the Goods as quoted in the pricing schedule and as agreed between the Council and the Contractor and in keeping with Payment Terms Negotiated with the Council. This Contract is a Lump Sum Contract for the whole of the Works and not subject to rise and fall. All fees and charges necessary for the successful completion of the Works shall be deemed to be included in the Lump Sum The Contractor shall pay the Construction Industry Training Board (CITB) Levy pertaining to the Works under this Contract in accordance with the Construction Industry Training Fund Act 1993. This purchase price will be authorised once the invoice for work has been authorised by the Superintendent. Prices must be listed exclusive of GST unless shown otherwise Contractor shall in their response provide a detailed schedule of rates with a breakdown of the costs for all fixed and variable costs (if applicable). Work, Health and Safety Requirements Formal Work Health & Safety Requirements Under the Work Health & Safety Act 2012 (SA), the Councils have a duty as a “person conducting a business or undertaking” (PCBU) to provide and maintain, so far as is reasonably practicable, a safe working environment for its employees, tenderers, contractors, sub-contractors, consultants, visitors and members of the public. To align with The Councils’ WHS duties, the successful Tenderer must comply and ensure that others comply with the following: 1. The Tenderer engaged in providing the Services must identify and discharge their own duties as a PCBU; 2. The Tenderer must ensure through a documented and systematic approach, that it complies with any Acts, regulations, local laws and by-laws or Guidelines applicable to the performance of the Services; and 3. The Tenderer must comply with any reasonable directions of The Council’s Contract Representative relating to safety and environmental matters if they arise. General Advice It is the responsibility of the contractor to comply with relevant state WHS legislation, relevant codes of practice, Australian standards and for reporting unsafe or unsatisfactory working conditions, hazards and incidents. The Contractor is to complete and provide all relevant Safe Work Method Statement (SWMS), Job Safety Analysis (JSA), Risk Assessment (RA) or Safe Work Instruction (SWI) paperwork to the Council. Safe Work Method Statement (SWMS) is a document which records the significant (prescribed) information relating to WHS for a construction project. 6|P a g e
Job Safety Analysis (JSA) simply means looking at the work task and considering what
is the safest way to complete it. It is a way of becoming aware of the hazards involved
in doing the job and taking action to prevent an injury. The JSA form will allow you to
record that the safety assessment has been carried out.
A Risk Assessment (RA) identifies the hazards and evaluates likelihood and
consequences of a potential incident.
A Safe Work Instruction (SWI) lists the possible issues for a known work situation or
environment and allows you to check that there are no changes that may create
new hazards or issues that compromise safety.
The above documents will assist in deciding the following:-
Eliminate the risk
The most effective control measure involves eliminating the hazardous manual
task and its associated risk.
Minimise the risk
If it is not reasonably practicable to eliminate the risk, then you must minimise
the risk so far as is reasonably practicable.
More Information on WHS requirements are available at www.safework.sa.gov.au
The Tenderer shall provide copies of safe work procedures and practices relating to
the Works to be undertaken as part of the Tender.
Reporting Hazards / Issues / Near Misses
In the instance of any incident, assessed hazard or near-miss the Councils
Superintendent should be contacted as soon as safely practicable and informed of
the situation so that the Council can ensure the appropriate steps have been taken
and the incident recorded and reported.
Conflict of Interest
Contractors must inform Council of any circumstances or relationships which will
constitute a conflict or potential conflict of interest if the Contractor is successful. If
any conflict or potential conflict exists, the Contractor must advise how it proposes to
address this.
If any conflict or potential conflict of interest is omitted, Council may suspend the
whole or any part of the Works if considered necessary.
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Format of Tender Response Tender responses will be assessed and rated using Councils Tender Evaluation Matrix. It is strongly encouraged for Contractors to address each of the topics listed below in their tender response so that the tender can be assessed thoroughly and fairly 1: Schedule of Rates 2: Breakdown of Schedule of Rates for all elements of construction. 3: Detailed draft PMP including Construction Schedule and milestones 4: Confirmation of Site inspection 5: Confirmation of Compliance with WHS requirements 6: Examples of Contractors site Safety management systems 7: Details of previously completed similar projects 8: Contact details for References for previous similar works completed 8|P a g e
Schedule of Rates – (complete and return) Construction of Wastewater System Upgrade at Auburn Recreation Ground. Tender Number: T02-2021 Before completing this Pricing Schedule, Respondents should ensure that they have read and understood the entire Tender. The rates must remain constant for the Term of the proposed Contract for Works. Clare and Gilbert Valleys Council cannot and will not guarantee the completeness or accuracy of the Schedule and therefore it can only to be used as a guide. It is therefore the Contractor’s responsibility to add items as appropriate to ensure that all items necessary to complete the Works, as provided within the requirements of the Tender documents. Contract payments will be made based on the rates provided in this Priced Schedule. The total provided will be used as the base price for assessing Quotes and awarding the Contract. The rates provided may also be used for the purpose of calculating variations to the Contract. If any item contained in this Schedule is not priced it shall be deemed either (a) the cost has been included elsewhere, or (b) no payment is required in respect to that item. I/We the undersigned, do hereby tender to perform the abovementioned work in accordance with the Tender Documents. TOTAL OF SCHEDULE OF RATES $ CITB LEVY $ GOODS & SERVICES TAX (GST) $ TOTAL CONTRACT SUM $ Tenderer’s Trading Name: ..................................................................................................... ABN: .......................................................................................................................................... Contact Person: ...................................................................................................................... Address: ................................................................................................................................... Telephone No: .................................................. Email......................................................... Signature: .................................................... Witness: ............................................................. Dated the ....................................................day of ........................................……….. 2021 9|P a g e
Wastewater System Upgrade Technical Specification Auburn Recreation Grounds Clare and Gilbert Valley Council 11 February 2021
Document Status
Version Doc type Reviewed by Approved by Date issued
V1 Draft DP DP 30/10/2020
V3 Final DP DP 15/02/2021
Project Details
Project Name Auburn Recreation Grounds
Client Clare and Gilbert Valley Council
Client Project Manager Ken Dolan
Water Technology Project Manager Dave Pennington
Water Technology Project Director Melinda Lutton
Authors Roxanne Frost
Document Number 20030166 Design Specifications v1.3
COPYRIGHT
Water Technology Pty Ltd has produced this document in accordance with instructions from Clare and Gilbert Valley
Council for their use only. The concepts and information contained in this document are the copyright of Water Technology
Pty Ltd. Use or copying of this document in whole or in part without written permission of Water Technology Pty Ltd
constitutes an infringement of copyright.
Water Technology Pty Ltd does not warrant this document is definitive nor free from error and does not accept liability for
any loss caused, or arising from, reliance upon the information provided herein.
1/198 Greenhill Road
Eastwood SA 5063
20030166 Design Specifications v1.3
Telephone (08) 8378 8000
Fax (08) 8357 8988
ACN 093 377 283
ABN 60 093 377 283
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 1CONTENTS
1 PRELIMINARIES 4
1.1 Background 4
1.2 Scope of Works 5
1.3 Drawings 5
1.4 Schedule of Key Components 5
1.5 Setting Out 6
1.6 Drainage of Site During Construction 6
1.7 Existing Services 6
2 ENVIRONMENTAL PROTECTION 8
2.1 General 8
2.2 Site Control 8
2.3 Hours of Work 8
2.4 Environmental Control 8
2.5 Stock Piling 8
2.6 Contractor’s Waste 9
2.7 Trucking 9
2.8 Preservation of Flora 9
2.9 Clean Up 9
3 GENERAL 10
3.1 Fencing 10
3.2 Quality Control and Assurance 10
3.3 Works Included 10
3.4 Matching in and Making Good 10
3.5 Manufacturers Recommendations 10
4 EARTHWORKS 11
4.1 General 11
4.2 Site Clearing 11
4.3 Work Around Trees 11
4.4 Topsoil Stripping and Spreading 12
4.5 Excavation and Filling 12
4.5.1 General 12
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4.5.2 Disposal 12
5 ONSITE WASTEWATER TREATMENT SYSTEM INSTALLATION 13
5.1 Scope 13
5.2 Pipelines 13
5.3 Effluent Disposal Trenches 13
5.3.1 Pressure dosed beds 13
5.4 Septic, Pumping and Balance Tanks 14
5.4.1 Excavation 14
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 25.4.2 Installation 14
5.4.3 Backfill 14
5.4.4 Pumps 14
5.5 Electrical 14
5.5.1 Electronic Control and Instrumentation 15
APPENDICES
Appendix A Soil Borelog Report
Appendix B Engineering Drawings
Appendix C SA Health Wastewater Approval
Appendix D Safety In Design
LIST OF FIGURES
Figure 1-1 Site layout and features 4
LIST OF TABLES
Table 1-1 Schedule of Key Components 5
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Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 31 PRELIMINARIES
1.1 Background
The Auburn Recreation Grounds (the Grounds) incorporates the Caravan Park, Community Centre, and
Sporting clubhouse.
Wastewater management at the Grounds has relied on an existing domestic Ri-Treat Aerobic treatment unit
(AWTS), which is undersized, especially during the holiday season when the caravan park is busy.
Council requires an upgrade of the wastewater facilities to adequately manage current loads and also provide
additional capacity for future growth. For this reason, the proposed upgrade has been separated into two
stages, firstly to address current under-capacity and, secondly, to incorporate into the design the infrastructure
required for future expansion for when that becomes necessary.
The following assessment evaluates site and soil conditions, design criteria, and construction requirements, in
accordance with the SA Health Onsite Wastewater Systems Code, 2013, (DHA code). A layout of the site is
provided in Figure 1-1.
It is important as part of the tender brief, that submissions include the proposed construction methodology and
outline the management approaches to minimise the impact on car parking and pedestrian movements.
20030166 Design Specifications v1.3
FIGURE 1-1 SITE LAYOUT AND FEATURES
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 41.2 Scope of Works
The scope of work in this contract comprises the supply, construction, installation and commissioning of all
works detailed on the drawings and in this specification. Works include site preparation, clearing, excavation,
pipeline laying and effluent disposal trenches. In general, the scope of works shall include:
◼ Identification of existing underground services, noting council has undertaken a preliminary investigation;
◼ Site access management (both traffic and shared use path);
◼ Excavation for pipeline construction, septic tank, pump chamber and pumps, balance tank installation and
effluent disposal trench construction;
◼ Onsite wastewater treatment system installation, commissioning, and site remediation;
The management of approvals and community liaison with be completed by the Superintendent.
1.3 Drawings
The following drawings all form part of the Contract and are referred to as "the Drawings".
TABLE 1-1 SCHEDULE OF DRAWINGS
Sheet Title Size
D01 Site Plan A3
D02 Onsite Wastewater System Layout North A3
D03 Onsite Wastewater System Layout South A3
D04 Dispersal Bed Detail: Conventional A3
1.4 Schedule of Key Components
The following main items of infrastructure and quantities (but not limited to), are required for the construction
of the wastewater system.
TABLE 1-2 SCHEDULE OF KEY COMPONENTS
Item Quantity Unit
20 kL Septic tank 1 Item
5 kL Pumping Chamber 1 Item
20 kL Balance tank 1 Item
Lowara DOC7 submersible pump, controller, and level probes 1 Item
Calpeda GQR 10 (32) – 12 submersible pump, controller, and 1 Item
20030166 Design Specifications v1.3
level probes.
150mm “Stormplastic” Knuckle joint and Expanda joint 2 Item
K-Rain series 6000 with six outlets cammed to 4 ports 1 Item
Ball Valve DN40 PVC (colour lilac) with Valve Box (colour lilac) 16 Item
Flow Meter DN50 1 Item
Gravity DN100 DWV 13 m
Pressurised DN50 PE Class 12 (colour purple stripe) 195 m
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 5Item Quantity Unit
Pressurized DN40 PVC Class 12 (colour lilac) 540 m
Electrical conduit DN50 and wiring, and control wiring, and draw 286 m
wire.
Effluent disposal system as detailed, and commissioning 1 item
1.5 Setting Out
Levels given in the Contract Documents are to the Australian Height Datum.
Measurements from Drawing and other information required to set out the Works shall be confirmed by the
Contractor on Site. The Contractor shall not be entitled to any claim arising from failure to confirm dimensions
or obtain measurements and other information on Site.
The Contractor shall exercise proper care in the preservation of all reference pegs or marks set out for its use
and that of the Superintendent. If such pegs or marks are damaged, lost or removed by the Contractor’s
operations, they shall be reset by or on behalf of the Principal at the Contractor’s expense. The Contractor
shall under no circumstances attempt to replace pegs other than its own.
1.6 Drainage of Site During Construction
The Contractor shall be deemed to have fully informed itself concerning water flows and levels insofar as they
may affect the work under the Contract.
The Contractor shall not obstruct any drain or channel and shall carry out the work in such a way as to ensure
that no heading up of floodwaters in new or existing drains or gutters occurs. The exception to this shall be the
management of any flows in the stormwater pipe, which must be managed during the construction process.
The contractor shall ensure optimal earthworks practices are implemented.
The Principal accepts no responsibility for loss of or damage to completed work or the Contractor’s plant or
materials due to flooding or erosive forces associated with River flows during construction.
The Contractor shall sequence and carry out the work under the Contract in such a manner as shall ensure
that an adequate drainage facility is operational at all times and shall minimise the effects of runoff and erosion
on the Site.
The Contractor will need to provide a mechanism by which normal drainage flows from the stormwater pipe
can bypass the works during the construction period. The contractor will be required to program and stage the
works in such a way as to prevent damage to any partially completed works by inundation.
1.7 Existing Services
20030166 Design Specifications v1.3
It shall be the Contractor’s responsibility to accurately locate any existing services, to carry out services checks
and make arrangements for any relocation or protection which may be required. All existing services indicated
on drawings are indicative only.
The contractor shall coordinate the set out of all infrastructure and location of existing underground services
in conjunction with council, to ensure existing services are not damaged. Council will undertake vacuum
potholing, as necessary, in conjunction with the contractor to identify existing services prior to commencement
of excavation.
The Contractor shall exercise all care during the progress of the work under the Contract to ensure that no
damage of any nature whatsoever arises to or in connection with the installations of and the workings of any
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 6services including services provided by any public utility and, without limiting the generality of the foregoing,
with those of gas, water, sewerage, electricity, telephone and general communication authorities. The
Contractor shall comply with all regulations and safety requirements of the relevant authorities responsible for
these services. The Contractor shall be liable for any such damage of whatsoever nature resulting from its
operations or arising through any act or through any failure to act on the part of the Contractor.
Such information (if any) relating to any such services as may be supplied by the Principal or Superintendent
to the Contractor shall be for the purposes of general information only. The locations of any services shown in
any document provided by the Principal are approximate only. It shall be the responsibility of the Contractor to
check and ascertain the accuracy and correctness of all such information and to make such other enquiries as
to enable the Contractor to comply with the provisions set forth in the previous paragraph. Any costs incurred
by a public utility due to any such damage by the Contractor and charged to the Principal shall be recovered
by the Principal by way of a deduction from the Contract Sum.
The contractor shall inform the Superintendent immediately on uncovering any services that may affect their
works.
Where it is necessary for an alteration to any existing service or the installation of any new service due to the
design requirements of the Works, such alteration or installation will be arranged at the expense of the
Principal. The Contractor shall be responsible for programming and co-ordinating the relevant authority to
implement the required work.
The Contractor shall arrange for the relocation of services to provide minimum clearance requirements from
the final alignment and levels. However, this shall not relieve the Contractor of any of its responsibilities and
obligations under the Contract.
If, during the course of the work under the Contract, the Contractor deems it necessary to have any utility
service removed or altered to enable easier or quicker construction, such removal or alteration shall be
arranged by the Contractor and any costs incurred shall be paid by the Contractor.
The Contractor shall give notice in writing to the owner of any utility that may be affected by construction
operations at least 48 hours prior to the commencement of such work.
If, while work is in progress, any authority desires to place a service, the Contractor shall allow reasonable
access and working space for the authority to carry out such placement, if requested by the Superintendent.
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Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 72 ENVIRONMENTAL PROTECTION
2.1 General
The Contractor shall take all measures necessary to ensure minimum disturbance to the existing environment
by its operations.
2.2 Site Control
The Contractor and its agents shall observe all Rules and Regulations applicable to the Site and shall comply
with all notices and instructions issued by the Superintendent in relation to such Rules and Regulations.
Except as otherwise provided in the Contract, delivery of any materials for the Works, space or the storage of
materials and for building sheds, offices and workshops will be allowed only as arranged between the
Contractor and the Superintendent.
When flammable or combustible materials are to be stored or used, the Contractor shall adhere strictly to any
instructions given by the Superintendent in regard to their storage or usage.
No new tracks shall be formed, existing tracks altered, camps erected, trees or shrubs removed, fences cut,
water, sewerage or power lines cut or any other such things done without the prior permission of the
Superintendent, apart from those identified on the project Drawings.
Under no circumstances whatsoever shall fires be lit without the prior permission in writing of the
Superintendent.
The Contractor shall keep all compounds, storage and work areas in a clean and tidy condition throughout the
work under the Contract.
2.3 Hours of Work
The hours of works shall be between 7am and 5pm Monday to Friday. Work outside these hours shall only be
completed with prior approval of the superintendent.
2.4 Environmental Control
The Contractor shall be responsible for ensuring that the provisions of this clause and any other environmental
protection provisions in the Contract are complied with and that the requirements of any statute, by-law,
standard and the like related to environmental protection are observed.
The Contractor shall design, construct, maintain and operate suitable pollution and erosion control facilities to
prevent discharge of water containing polluting matter or visible suspended soil or other materials into any
defined drainage line, water course, drain or drainage structure.
20030166 Design Specifications v1.3
The Contractor shall, not less than 3 working days before commencement of work on the Site, submit to the
Superintendent its proposals for traffic movements, temporary structures, temporary diversions, erosion
control, cleaning up and the like. After the proposals have been approved by the Superintendent, the
Contractor shall be responsible for ensuring that the approved proposals are observed. Any changes to the
approved proposals shall be subject to the prior agreement of the Superintendent. Such approvals shall not
relieve the Contractor of its responsibilities and obligations under the Contract.
2.5 Stock Piling
Stock piling of construction materials may be necessary during the works. Instruction should be sought from
the superintendent on the appropriate location for stockpiling of materials prior to starting works.
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 8The contractor shall ensure appropriate sediment control is implemented to control sediment from stockpiles.
This should include the use of sediment fences.
2.6 Contractor’s Waste
The Contractor shall prevent the entry of all detritus and any concrete, hydrocarbon, garbage, liquid or human
waste from the Site to the stormwater drainage/creek system.
Waste from construction operations, including food scraps and the like, shall not be dropped free but shall be
removed from the Site. The Contractor shall provide hoppers or garbage bins for the collection of Site waste
and shall regularly remove it. All such hoppers or bins shall be covered or be of such design as to fully confine
the material and prevent dissemination of dust and odour.
2.7 Trucking
Trucks leaving the Site with earth materials or loose debris shall be loaded in such a manner as will prevent
dropping of materials on the roadways and prevent a dust nuisance being caused from the load. Trucks
bringing materials to the Site shall be similarly loaded.
The wheels, tracks and body surfaces of all plant and vehicles leaving the Site shall be free of mud so that
mud is not carried on to adjacent roads or paved areas.
2.8 Preservation of Flora
The Contractor shall take every reasonable precaution not to damage any tree (unless required by the Contract
to be removed), including its root system, and shall keep stripping of topsoil, trafficking of vehicles and plant,
storage of materials, equipment or rubbish away from existing trees which are to be retained.
The Superintendent may direct the Contractor to repair any damage or injury to a tree or vegetation that is to
remain. This work shall be carried out promptly as directed by the Superintendent at the Contractor’s expense.
If trimming of trees or vegetation is required in, approval must be sought from the Superintendent (who will
consult with the Principal) at least 48 hours before the planned activity.
The Contractor shall also remove woody weeds and pest plants in areas to be excavated and avoid the spread
of caltrop during earthworks and vehicle movements through the Site.
2.9 Clean Up
The Contractor shall clean up the Site of all loose and surplus materials, debris, rubbish and other items and
leave the Site in a clean, tidy condition.
Areas of the Site subjected to disturbance by the marks or machinery shall be restored and left in a condition
satisfactory to the Superintendent.
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Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 93 GENERAL
3.1 Fencing
The contractor shall ensure that the site is kept secure at all times to ensure the safety of the public. The
location and extent of the perimeter fencing is to be negotiated with the Superintendent.
3.2 Quality Control and Assurance
The Contractor shall inform itself of all quality requirements of the Contract and prepare and implement at its
own cost quality control and quality assurance programmes for the whole of the Works.
The Contractor shall maintain effective control of the quality of the materials and work and perform all
examinations and tests required by the Contract to demonstrate their conformance to the technical
requirements of the Contract and shall offer for acceptance only materials and work that so conform. The
Contractor shall, if requested by the Superintendent, provide objective evidence that controls and inspection
are effective.
The Superintendent may perform any examination or tests to ensure that materials and work conform to the
technical requirements of the Contract and to reject any which do not so conform.
3.3 Works Included
The work under the Contract comprises the supply of the whole of the plant, labour, technical skills and
materials necessary to execute the Works described in the Specification and/or shown on the Drawings.
The Contractor is responsible for confirming on Site the exact location and extent of the Works.
3.4 Matching in and Making Good
The Contractor shall carry out all work necessary for the proper matching in of new and existing works.
Where partial removal of items such as kerbs, gutters, pipes, pathways, concrete or bitumen, is required, the
item is to be first cut neatly with a saw or other means approved for the purpose in such a way as to avoid
unnecessary damage and repair.
The Contractor shall not interfere with or damage property which is to remain on or adjacent to the site,
including adjoining property encroaching onto the site, and trees. If interference or damage to such property
occurs the contractor shall immediately rectify any damage.
Any damage shall be made good and left in a safe and secure condition at least equal to the existing standard
of construction and to the satisfaction of the Superintendent.
Where the item is controlled by a statute or regulation, the standard of reinstatement shall meet the
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requirements of that statute or regulation.
3.5 Manufacturers Recommendations
Manufactured products should be transported delivered, stored, handled, protected, finished and prepared for
use in accordance with the current written recommendations and instructions of the manufacturer or supplier.
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Auburn Recreation Grounds Page 104 EARTHWORKS
4.1 General
This Part specifies the requirements for the construction of earthworks, including soft spot repair, excavation,
the construction of fill and spreading of topsoil.
The Contractor shall construct earthworks to conform to the lines, grades, cross sections, levels, dimensions
and tolerances detailed in the Contract Documents.
4.2 Site Clearing
The Site shall be cleared of vegetation, rubbish, existing pavement seal and structures (including fencing) to
the extent indicated on the Drawings or as necessary to satisfy the requirements of the Contract.
If in the course of clearing and excavation any hazardous or potentially hazardous material is encountered,
the Contractor shall immediately notify the Superintendent and request a direction.
4.3 Work Around Trees
All trees are to be protected unless marked for removal.
The Contractor shall keep the area within the drip line free of paths, construction material and debris. The
Contractor must not store bulk materials under trees. The Contractor must not place spoil against tree trunks.
Prevent damage to bark. The Contractor shall not compact the ground under the tree drip line.
Where severing of roots above 30mm in diameter is required the work should be assessed by a qualified
Arborist (to be supplied by the Principal). In all situations as many roots as is possible are to be retained.
Where excavation is required near trees to be retained use hand methods to locate and expose and cleanly
remove the roots.
Removal shall include felling, grubbing, disposal and backfill.
Backfill shall be with selected excavated material or approved granular material compacted to the density
required for the relevant constituent layer. If no density is specified, compaction shall be in layers of maximum
300 mm uncompacted thickness to 80% of standard maximum dry density as defined by AS1289.5.1.1.
Where branches intrude onto the working area and are likely to be damaged during execution of the work
under the Contract, they shall be trimmed as approved by the Superintendent to the branch collar with a clean
saw cut.
Prior to commencement of work, the Contractor shall inspect all vegetation to be removed and any areas to
be cleared for the presence of insects or animals that could either potentially cause harm to on-site staff or
themselves during the course of carrying out the works.
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Should during the course of works any potentially harmful insects or animals be detected, the Superintendent
is to be notified immediately and all work in the area is to cease.
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Auburn Recreation Grounds Page 114.4 Topsoil Stripping and Spreading
Topsoil is defined as the surface layer of organic material, high in humus content and suitable for propagating
seedlings.
Grass cover and topsoil shall be stripped from areas to be worked. Where topsoil is of a greater depth than
100 mm, the Contractor shall strip topsoil up to a maximum depth of 200 mm. Where topsoil depth is less than
100 mm, only topsoil shall be stripped.
Topsoil shall be stockpiled at a location approved by the Superintendent for later respreading over the works
or disposal if topsoil is found to be in excess.
4.5 Excavation and Filling
4.5.1 General
The Contractor shall construct earthworks (i.e. excavation and/or filling) to conform to the lines, grades, cross
sections, levels, dimensions and tolerances as specified in the Contract.
If any of the following are encountered the Superintendent is to be informed immediately and instructions are
to be obtained before any further work can be carried out:
◼ poor ground;
◼ rock;
◼ springs seepages;
◼ discrepancies; and
◼ contaminated soil or water (visual or odours).
4.5.2 Disposal
Disposal of excess excavated material should be spread on site as directed by the Principal.
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Auburn Recreation Grounds Page 125 ONSITE WASTEWATER TREATMENT SYSTEM INSTALLATION
5.1 Scope
This section covers the requirements for construction and installation of the onsite wastewater system. The
system includes pipework, effluent disposal trenches, septic tanks, balance tanks, pumps and electronic
control and instrumentation.
5.2 Pipelines
Several different types of pipe must be installed for the system please refer to Drawing D01-D03 for location
and arrangement of pipework. All pipe connection must be flexible connections as soil profile indicated
moderate to high reactivity. The following types of pipe types will be installed:
◼ Gravity DN100 DWV in accordance with AS/NZS 1260
◼ Pressurised DN50 PE Class 12 (colour purple stripe) in accordance with AS/NZS 4130 Polyethylene (PE)
pipes for pressure applications
◼ Pressurized DN40 PVC Class 12 (colour lilac) in accordance with AS/NZS 4765 Modified PVC (PVC-M)
pipes for pressure applications
The following pipe connections and valves for the effluent disposal system must be installed:
◼ DN40 PVC Ball Valve (colour lilac handle)
◼ Valve Box (DURA large lilac lids)
◼ K-Rain series 6000 with six outlets cammed to 4 ports
◼ New DN50 flow meter for effluent flow metering in large in ground valve box
◼ 150mm “Stormplastic” Knuckle joint and Expanda joint (or similar approved)
◼ Location and new connection to existing sewer as indicated on the Drawings
The minimum trench with and depth shall be in accordance with the relevant pipe material standard.
5.3 Effluent Disposal Trenches
Pressure dosed beds using the LPED dosing laterals in accordance with AS1547:2012 is selected for this site.
Refer to Drawing D04 for details, and D01-D03 for location, and arrangement.
5.3.1 Pressure-dosed beds
The following construction methodology shall be used to install the disposal beds:
◼ Remove and stockpile topsoil and sandy material to approximately 450mm.
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◼ Thoroughly deep rip 300mm with 2 applications of gypsum (1.0kg/m²) following ripping.
◼ Firm the bed floor using the excavator bucket without over-compacting, and screed level;
◼ Place screenings, distribution system and geo-textile fabric, and backfill with remaining stockpiled topsoil;
◼ Mound slightly over all beds to divert surface water finished level approx.50mm above existing ground.
◼ Allow to undertake a flow test of the distribution system ensuring the indexing valve is operating correctly,
and dosing laterals have even squirt height, prior to covering.
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 13The whole wastewater disposal area should be smoothed and finished by planting with salt and nutrient
tolerant plants and/or grasses or turf to promote the transpiration capacity of the system and stabilise the
disturbed surfaces. The contractor shall seek advice from council regarding the preferred finishing and
landscaping requirements. Refer to D04 for further details.
5.4 Septic, Pumping and Balance Tanks
The onsite wastewater system includes the following septic, pumping and balance tanks in accordance with
AS1547:2012:
A RI Industries 20,000L septic tank fitted with Nobis outlet filter and a 5,000L pumping chamber fitted with a
Lowara DOC7 submersible pump, and RI Industries 20,000L holding tank fitted with a Calpeda GQR10(32)-
12 submersible pump, has been selected for this project. Refer to Drawings for location and arrangement.
The 12,000L septic tank, and additional 2 disposal beds identified on the Drawings are for future project and
will not be constructed in this contract.
5.4.1 Excavation
Tank location should be carefully selected to ensure that no surface water or stormwater collects or will be
directed to it. The surface area of the excavation for the tanks must exceed the tank dimensions by
approximately 500 mm on each side, to allow for adequate compaction.
Place a layer of clean bedding sand in the hole and compact to minimum 50mm thick. Sand surface must be
flat and level, and free from all foreign matter.
5.4.2 Installation
Tanks must be lowered into the prepared excavation pit using appropriate lifting lugs. Ensure bedding sand is
not disturbed during installation. Inlet and outlet pipes must be connected according to manufacturer’s
instructions. All inlet and outlet pipes must be laid with an incline of at least 1.65%, in accordance with AS3500.
5.4.3 Backfill
Use sand or excavated material or spoil with maximum particle size of 5mm. Backfill around the tanks layer by
layer in steps of a maximum of 300mm Each layer must be well compacted (hand tamper). Ensure no damage
occurs to the tank while compacting backfill.
5.4.4 Pumps
A Lowara DOC7 submersible pump will be installed in the 5,000L pumping chamber. A Calpeda GQR10(32)-
12 submersible pump will be installed in the 20,000L holding tank. Refer to manufacturer brochures for details.
5.5 Electrical
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Power supply for the project can be sourced from the switchboard located on the existing toilet block. It is
understood from a preliminary inspection that there is capacity and space for the proposed connections.
All electrical connections must be carried out by tradespersons who are experienced and licensed for such
work.
The contractor shall allow to supply and install all conduit, wiring, and equipment as detailed, for the full
functioning of the wastewater system. This includes:
◼ Sizing of power supply, wiring, conduits, and solid connection to 2 x pumps,
Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation Grounds Page 14◼ Supply and installation of audible/visual level alarms, conduits, wiring and connections
◼ Coordination with other trades including trenching, installation, and backfilling of common service
trenching as detailed on the Drawings.
In addition, council has requested that the Contractor allow to investigate cost saving opportunities, including
the potential to connect to the existing electrical feed to the Riding club.
5.5.1 Electronic Control and Instrumentation
The electrical contractor is required to design, supply and install the pump control system to manage the flow
of effluent described by the following operational rules:
◼ The transfer pump located in the 5,000L pumping chamber shall operate on a float switch on demand,
capable of being over-ridden when the 20kL holding tank is full.
◼ Either a level probe or float switch shall be fitted to the pump chamber to activate the pump when there is
at least 650L available in the chamber.
◼ The 20kL holding tank shall have a high-level alarm probe set to alert the operator when full. When this
occurs, the transfer pump will be isolated leaving approximately 5000L capacity/emergency storage, which
should allow the operator time sufficient time to remediate.
◼ An alarm condition is also activated if the transfer pump or distribution pump fails to activate.
◼ The distribution pump located in the 20kL holding tank shall be controlled by timer to ensure no greater
volume than 5,208L is delivered to the disposal beds per day. This can be arranged by sequentially time
dosing each disposal bed with 660L per event. Over an average day, the 4 beds will be dosed twice per
day.
◼ Level alarm probes fitted to both holding tanks shall be connected to two audible/visual alarm units
mounted externally on the toilet block wall.
Level alarm probes fitted to holding tank and pumping chamber shall be connected to two audible/visual alarm
units mounted externally on the toilet block wall.
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Auburn Recreation Grounds Page 15APPENDIX A
SOIL BORELOG REPORT
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Auburn Recreation GroundsAPPENDIX B
ENGINEERING DRAWINGS
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Auburn Recreation GroundsAPPENDIX C
SA HEALTH WASTEWATER APPROVAL
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Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation GroundsOFFICIAL
Health Protection and
Licensing Services
Contact: Katie Koto Citi Centre Building
Telephone: 08 226 7100 11 Hindmarsh Square
Adelaide SA 5000
Email: healthwastewatermanagment@sa.gov.au PO Box 6
Rundle Mall SA 5000
DX 243
Tel 08 8226 7100
Our reference: WWI-10749 Fax 08 8226 7102
ABN 97 643 356 590
www.health.sa.gov.au
Clare and Gilbert Valleys Council
C/O Dave Pennington
Water Technology
1/198 Greenhill Road, EASTWOOD SA 5063
Dear Mr Pennington,
RE: On-site wastewater system to service Auburn Recreation Grounds located at Ford
Street, Auburn SA 5451.
I refer to your wastewater water works application relating to wastewater management at
the above location.
Pursuant to the South Australian Public Health (Wastewater) Regulations 2013, the
wastewater system has been approved by the Department for Health and Wellbeing (DHW)
subject to the following conditions:
1. The approved system incorporates:
Stage 1 works
1.1. 1 X 20kL RI Industries septic tank with Nobis outlet filter.
1.2. 1 X 5kL SA Health approved pump chamber and Lowara DOC7 submersible pump.
1.3. 1 X 20kL RI Industries balance tank with Calpeda GQR10(32)-12 submersible
pump and provision for connection to future septic tank.
1.4. 4 X 42m x 3.1m pressure-dosed soakage beds.
1.5. Decommission of existing Ri-Treat aerated wastewater treatment system and
existing septic tank.
Stage 2 works
1.6. 1 X 12kL RI Industries septic tank.
1.7. 2 X 42m x 3.1m pressure-dosed soakage beds.
2. The system is to be installed, commissioned, operated and maintained in accordance
with:
2.1. The reports, plans and specifications as referenced in this approval
2.2. Designers, manufacturers, installers and equipment suppliers’ instructions and
recommendations.
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On-site wastewater system to service Auburn Recreation Grounds.
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OFFICIALOFFICIAL
2.3. South Australian On-site Wastewater Systems Code.
2.4. AS/NZS 3500 Plumbing and drainage.
2.5. AS/NZS 1547 On-site domestic-wastewater management.
2.6. Operation and maintenance manuals for the system.
2.7. All other relevant standards and codes.
2.8. Conditions of this approval.
3. A licensed plumber must carry out the installation of the wastewater system and submit
to the Department for Health and Wellbeing (DHW) a plumbing certificate of compliance
and ‘as-constructed’ drawings within 28 days of the works being completed.
4. The DHW reserves the right to inspect during any stage of construction and at practical
completion of the installation.
5. The operator of the on-site wastewater management system must ensure that the lids
and access openings are to be fitted so as to be childproof and gas and water tight.
6. The septic tank must be de-sludged on a minimum four yearly basis by an Environmental
Protection Authority (EPA) licenced waste transporter. De-sludge records must be
retained by the operator and provided to the DHW on request.
7. The subsurface effluent disposal system must not be subject to vehicle traffic and
structural loadings.
8. Pumps must be suitable for their intended load and operating environment.
9. An alarm system must be provided for the pump sump in accordance with the
requirements outlined in the SA On-site Wastewater Systems Code.
10. The following discharges into an on-site wastewater system are prohibited:
10.1. Any storm water.
10.2. Any back-flush waters from a swimming pool or water softener.
10.3. Any discharge or back flush from a spa bath/pool in excess of 680 litres capacity.
10.4. Any sanitary napkin, clothing, flushable wipes, plastic material or liner.
10.5. Any paint, petroleum products, strong alkaline, acids or other flammable or
explosive substance whether solid, liquid or gas.
10.6. Any trade waste, other than that associated with the commercial food
preparation activities conducted on the site.
11. A change to the capacity of the system due to an increase in hydraulic load will require
wastewater works approval.
12. In accordance with the engineer’s design report, the subsurface effluent disposal system
is to receive no more than 5,208L/d. Upon completion of Stage 2, the subsurface
disposal system is to receive no more than 7,812L/d.
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OFFICIALOFFICIAL
13. Non-compliance with any of the conditions of approval shall be reported as soon as
practicable but within one business day by email to the Minister for Health and
Wellbeing (c/o Wastewater Management Section, Department for Health and
Wellbeing).
14. Pursuant to the South Australian Public Health (Wastewater) Regulations 2013, the DHW
reserves the right to vary any or all of the approval conditions, and require the repair,
replacement, rectification, or alteration of the system or any part thereof should at any
time:
14.1. The system or a component thereof not be manufactured, installed and/or
operated in accordance with the approval conditions; or
14.2. The system is defective and not able to perform the function for which the
approval was issued; or
14.3. The system is operated in a manner that is prejudicial to public and
environmental health, or causes environmental nuisance.
15. This approval shall become void if the installation is not completed within 24 months of
the date of this approval.
Approved by: Date: 18 February 2021
Karen Bennink
Manager, Wastewater Management
Delegate of the Minister for Health and Wellbeing
Cc Clare and Gilbert Valleys Council
References: Onsite Wastewater Assessment and Design, Ref. 20030166_OSWS
report_v3.0, dated 16 February 2021, prepared by Water Technology.
Note 1. The approval does not abrogate responsibilities under other Acts or Regulations
to obtain the necessary approvals, permits or licences from other agencies,
including but not limited to:
Environment Protection Authority (EPA)
Department for Environment and Water
Natural Resource Management Boards
Office of the Technical Regulator
Department of Primary Industries and Regions SA
State Planning Commission
The Local Council
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OFFICIALAPPENDIX D
SAFETY IN DESIGN
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Clare and Gilbert Valley Council | 11 February 2021
Auburn Recreation GroundsIn accordance with the Work Health and Safety Act 2012, the aim of Safety in Design is to identify potential
health and safety hazards during the design process and recommend control measures to mitigate the risks,
as far as reasonably practical, to the environment and personnel.
The following sections summarise the health and safety hazards which have been considered in this design.
Intended Purpose of Design
Onsite domestic wastewater treatment and disposal systems for residential and commercial installations
requiring detailed system design, site and soil evaluation, and construction report.
The Australian Design standards used for the design of the onsite domestic wastewater treatment and disposal
systems are AS1547:2012 in conjunction with relevant Public Health Act and Wastewater Regulations, EPA
Act, and Codes.
Design Parameters
The following design parameters has the following safety considerations:
TABLE D-1 DESIGN PARAMETERS
Design Parameter Safety Consideration
Design Flow Sufficient redundancy to ensure system function for
a range of occupancy rates
Surface soil infiltration rate Soil permeability is variable. Always consider Long
term acceptance rate (LTAR)
Treatment capacity and type Meets WQ parameters/ fit for purpose use
Site location Regional influences, contamination of watercourses
and groundwater
Disposal location Setback distances to structures, effect of soil
movement on structures due to wetting and drying
soils
Design Features
The following design features has the following safety considerations:
TABLE D-2 DESIGN FEATURES
Design Feature Safety Consideration
Excavation work for infiltration beds, holding tanks, Provision for fall protection. Shoring, benching to
irrigation/pipework prevent trench collapse.
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Soil testing and analysis Driller required to visit uncontrolled sites (Driller
WHS plan). Safe access provisions. Location of
underground services. Use accredited soil
laboratory analysis
Materials selection Proprietary/Approved product selection fit for
purpose (ie reclaimed water use). Appropriate
material warrantees. Selection of certified
aggregates from quarries, as appropriate.
Soil categorisation AS1547:2012 procedure. COC maintained.
Reference to previous knowledge in locality.
Clare and Gilbert Valley Council | 11 February 2021
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