C30 Water Supply - Mackay Council · Australia publication ‘WSA 03-2011 Version 3.1 – Water Supply Code of Australia’ (the ‘Code’) except where the Code is amended by this

Construction Specification

C30

Water Supply

Supplement to the WSAA Water Supply Code of Australia

(WSA 03-2011 Version 3.1)

Revision 3 September 2012

Document Control

Rev Date Clause Details Author Verifier Approver

1 15/03/2006 - Original Version

2 02/02/2008 All General revision, major amendments

3 Full revision to WSA03-2011

Table of Contents

Preface ....................................................................................................................................... 6

Part 0: Glossary of Terms, Abbreviations and References ...................... 7

III REFERENCED DOCUMENTS ...................................................................................................... 7

Part 2: Construction ........................................................................ 8

10 GENERAL ............................................................................................................................... 8

10.1 Scope .............................................................................................................................. 8

10.2 Interpretation ................................................................................................................... 8

10.3 Quality Assurance ......................................................................................................... 10

10.3.1 General ................................................................................................................... 10

10.3.2 Inspection and test plans ........................................................................................ 10

10.3.3 Quality tests ............................................................................................................ 10

10.3.4 Quality audits .......................................................................................................... 10

10.4 Personnel Qualifications ................................................................................................ 11

11 GENERAL CONSTRUCTION ................................................................................................... 12

11.1 General .......................................................................................................................... 12

11.5 Protection Of People, Property And Environment ......................................................... 12

11.5.1 Protection of Other Services ................................................................................... 12

11.5.2 Disused / Redundant water mains ......................................................................... 12

11.5.4 Private and public properties .................................................................................. 12

11.13 Affected Party Notifications ......................................................................................... 13

12 PRODUCTS AND MATERIALS ................................................................................................. 14

12.1 Authorised Products and Materials ............................................................................... 14

12.1.2 Pressure pipe-work and pipe fittings ...................................................................... 14

12.1.3 Valves ..................................................................................................................... 16

12.3 Transportation, Handling and Storage of Products and Materials ................................ 18

12.4 Rejected Products and Materials .................................................................................. 18

12.5 Concrete Works ............................................................................................................. 18

13 EXCAVATION ........................................................................................................................ 21

13.1 Precautions.................................................................................................................... 21

13.5 Support of Excavations ................................................................................................. 21

13.9 Trench Excavation ......................................................................................................... 21

13.9.1 General ................................................................................................................... 21

13.11 Foundations and Foundation Stabilisation .................................................................. 22

13.12 Surplus Excavated Material......................................................................................... 22

14 BEDDING FOR PIPES ............................................................................................................. 23

14.1 Trench Floor Preparation .............................................................................................. 23

14.2 Bedding and Pipe Support ............................................................................................ 23

14.3 Placement of Bedding ................................................................................................... 23

15 PIPE LAYING AND JOINTING ................................................................................................... 24

15.1 Installation of Pipes ....................................................................................................... 24

15.1.1 General ................................................................................................................... 24

15.1.3 Cleaning, Inspection & Joint Preparation ............................................................... 24

15.1.4 Laying ..................................................................................................................... 24

15.2 Horizontal and Vertical Deflections of Pipes ................................................................ 25

15.2.2 Deflection at a Pipe Joint ........................................................................................ 25

15.6 Flotation Control ............................................................................................................ 25

15.7 Thrusts & Anchor Blocks and Restrained Joints ........................................................... 25

15.9 Trench stops .................................................................................................................. 26

15.10 Bulkheads .................................................................................................................... 26

15.11 Corrosion Protection of Cast Iron ................................................................................ 26

15.12 Marking Tapes ............................................................................................................. 26

15.12.2 Detectable Marking Tape ..................................................................................... 26

15.13 Valves, Hydrants and Surface Fittings ........................................................................ 26

15.13.1 Installation............................................................................................................. 26

15.13.2 Valve Chambers for Large Mains ......................................................................... 27

15.15 Bored Pipes Under Roads, Driveways and Elsewhere ............................................... 27

15.18 Appurtenance Location Marking ................................................................................. 28

15.20 Welding of steel water mains ...................................................................................... 29

15.20.1 General ................................................................................................................. 29

16 PIPE EMBEDMENT AND SUPPORT .......................................................................................... 30

16.2 Embedment Materials ................................................................................................... 30

16.3 Compaction of Embedment ........................................................................................... 30

16.3.1 Methods .................................................................................................................. 30

16.6 Concrete Embedment and Encasement ....................................................................... 30

17 FILL ..................................................................................................................................... 31

17.1 Trench Fill ...................................................................................................................... 31

17.1.1 Material Requirements ........................................................................................... 31

17.1.2 Placement ............................................................................................................... 31

17.1.3 Compaction of Trench Fill ...................................................................................... 31

18 SWABBING ........................................................................................................................... 32

18.1 General .......................................................................................................................... 32

19 ACCEPTANCE TESTING ......................................................................................................... 33

19.3 Compaction Testing ...................................................................................................... 33

19.3.2 Compaction testing requirements ........................................................................... 33

19.3.2.4 Frequency and location of tests .......................................................................... 33

19.4 Hydrostatic Pressure Testing ........................................................................................ 33

19.4.1 General ................................................................................................................... 33

19.4.2 Mains ...................................................................................................................... 33

19.4.3 Property services .................................................................................................... 34

19.7 Water Quality Testing .................................................................................................... 34

19.7.1 General ................................................................................................................... 34

19.8 Detectable Marking Tape .............................................................................................. 34

20 DISINFECTION ....................................................................................................................... 35

20.1 General .......................................................................................................................... 35

22 CONNECTIONS TO EXISTING WATER MAINS ............................................................................ 36

22.1 General .......................................................................................................................... 36

23 RESTORATION ...................................................................................................................... 37

23.1 General .......................................................................................................................... 37

23.2 Pavements..................................................................................................................... 37

23.6 Provision for and rectification of settlement .................................................................. 37

23.7 Maintenance of restored surfaces ................................................................................. 37

24 WORK AS CONSTRUCTED DETAILS ........................................................................................ 38

Appendix A Not used Yet .................................................................................................... 39

Preface The construction of water supply infrastructure must comply with the Water Services Association of Australia publication ‘WSA 03-2011 Version 3.1 – Water Supply Code of Australia’ (the ‘Code’) except where the Code is amended by this document. The following amendments, additions, deletions and alterations apply to and form part of the Code. Section and Clause numbers refer to those in the Code. The standard drawings and figures contained in the Code do not apply. Refer to the Mackay Regional Council standard drawings. Ultimately, this document will include amendments, additions, deletions and alterations to Part 1 'Planning and Design' of the Code so as to form a complete supplement to the Code. At this time the amendments, additions, deletions and alterations to Part 1 'Planning and Design' of the Code are included in the Mackay Regional Council document 'Engineering Design Guideline - Water Supply Design - Planning Scheme Policy No. 15.12.

Part 0: Glossary of Terms, Abbreviations and References III REFERENCED DOCUMENTS Add the following; The latest edition of all referenced documents, including all amendments and supplements, are to be used. The following documents are referred to in this Code;

a) Council Planning Scheme Policies

i) No. 15.12 - ‘Water Supply Design’ ii) No. 16.03 - ‘Water Supply & Sewerage Infrastructure Contributions Policy’

b) Mackay Water Polices

i) MW02 - ‘Building Over and Adjacent to Sewers’ ii) 063 - ‘Clearances to Water & Sewerage Assets’

c) Council Engineering Design Guidelines

i) D20 – ‘Drawings and Documentation Guidelines’ d) Council Standard Drawings

e) Water Services Specification, WS-SPEC:2000 f) Australian Standards

g) Other Documents

i) ‘Guide to Codes and Practices for Streets Opening’ (NSW Streets Opening

Conference, 2009). ii) ‘Planning Guidelines for Water Supply and Sewerage’ (Department of Environment

and Resource management, April 2010) iii) ISO 5199 – ‘Technical specifications for centrifugal pumps – Class II’

Part 2: Construction 10 GENERAL 10.1 Scope (Add the following) Any inconsistency or ambiguity between the various documents comprising this Specification shall be resolved by the adoption of those documents in the following order of precedence;

1. Statutory Legislation 2. This Specification 3. Mackay Regional Council Standard Drawings 4. Mackay Regional Council Standard Specifications 5. Mackay Regional Council Standard Policies 6. Water Supply Code of Australia (WSA 03-2011 Version 3.1) 7. Water Services Specification, WS-SPEC:2000 8. Australian Standards

The work must comply with relevant Statutory Legislation, Codes of Practice, Australian Standards and Council’s local laws, policies, guidelines and specifications. This Specification applies in the construction of the various elements of a water supply infrastructure system which include, but are not limited to;

(a) trunk, reticulation and property connection water mains (b) maintenance structures (c) property connections to water mains (d) standard appurtenances (e) pumping stations

10.2 Interpretation (Add the following) Asset Creation means any or all aspects of the planning, design, construction, supervision of construction, testing and commissioning and eventual handover of water supply infrastructure Contractor means a person, corporation, company, business or other legal entity bound under law to execute work under a contract or agreement. Contractor also means ‘Constructor’. Council means Mackay Regional Council and the Mackay Water & Waste business unit of Mackay Regional Council. Designer means a Professional Engineer who is qualified in Queensland (currently met by a person being registered as a Registered Professional Engineer Queensland (RPEQ) and is competent to perform the engineering works required for the Asset Creation process on behalf of a Developer. Developer means the person who has submitted a planning application for the provision of infrastructure under the Asset Creation process or for the utilisation of existing water supply infrastructure.

HOLD POINT means a point beyond which work may not proceed (the Hold Point released) without authorisation, and sign-off, by the Superintendent’s representative and/or Mackay Regional Council’s representative. Release of a hold point may also be subject to an inspection of works by the Superintendent’s representative and/or Mackay Regional Council’s representative. IDAS means the Integrated Development Application System under the Sustainable Planning Act (SPA) MRC means the Mackay Regional Council MONITOR means intermittent surveillance of any stage of the work in progress by the Superintendent and/or the Superintendent’s Representative and/or the principal’s representative and/or Mackay Regional Council’s representative. SELF INSPECT means the progressive verification of the quality, and/or adherence to construction specifications, by the constructor/service provider and Principal Constructor (Contractor) performing the work. Confirmation of completion of Self Inspect requirements shall be by constructor checklist sign-off. Service Reticulation means pipework less than DN300 and to which service connections are permissible. SCA means Switch-gear and Control-gear Assembly and includes main switchboard, main distribution board, distribution board, control board, electrical kiosk, electrical panel, control panel or similar enclosure. SPA means the Queensland Sustainable Planning Act 2009. Surveyor means a person, registered as a Surveyor (minimum Class – ‘individual’) with the Surveyors Board of Queensland under the Surveyors Act of Queensland, who is competent to perform the surveying work required of the works described in this document and the documents referenced herein. The Code means the Water Supply Code of Australia (WSA-03-2002-2.3) published by the Water Supply Association of Australia (WSAA). Trunk Mains means pipework equal to or greater than DN300 in diameter and to which service connections are not permissible or generally not present. WITNESS POINT means a point beyond which work may not proceed without the Contractor notifying the Superintendent’s representative and/or Mackay Regional Council’s representative in order to provide the Superintendent’s representative and/or Mackay Regional Council’s representative with the opportunity to witness, and sign-off, an inspection or test or aspect of the work. The Superintendent’s representative and/or Mackay Regional Council’s representative, at their discretion, may authorise the inspection or test or aspect of the work to proceed without the Superintendent’s representative and/or Mackay Regional Council’s representative witnessing, and signing off, the inspection or test or aspect of the work. WS-SPEC means the Water Services Specification (2000) published by NSW Department of Public Works and Services.

10.3 Quality Assurance (This clause 10.3 is a new clause) 10.3.1 General The Contractor shall comply with all requirements of the Civil Contractors Federation (CCF) Civil Construction Management Code. Prior to works commencing the Contractor must submit to the Superintendent evidence of its certification to the CCF Code (or equivalent). The Superintendent shall submit all certification evidence to Council prior to works commencing. Submission of certification evidence to the Superintendent constitutes a HOLD POINT. Release of the Hold Point via signoff by the Superintendent, subject to the Superintendent’s review and confirmation of the certification, is required prior to works commencing. 10.3.2 Inspection and test plans Council has prepared an Inspection and Test Plan (ITP) based on the WSAA Water Supply Code of Australia and the amendments to the Code detailed in this document. The Contractor’s ITP must include, at least, all the details contained within the Council prepared ITP. 10.3.3 Quality tests The Constructor shall be responsible for the quality of all products, processes and services under the contract, and unless otherwise specified, shall provide all tests required to demonstrate conformance of all products, processes and services to the technical requirements of the contract. Unless otherwise agreed by the Superintendent, all laboratory tests and field tests undertaken by the Constructor shall be performed by a Tester currently registered with the National Association of Testing Authorities (NATA) or equivalent authority for the class of tests being undertaken. 10.3.4 Quality audits Witness Points and Hold Points are specified within this document and referred documents for works described within this document and referred documents. It is the Constructors/Contractors responsibility to advise the Superintendent and/or Council of the anticipated or planned occurrence of any construction process/aspect or Inspection activity/aspect for which there is an associated Witness Point or Hold Point. Upon request, the Superintendent shall be given access in conjunction with or through the Constructor, to carry out quality audits, reviews or surveillance or to ascertain the effectiveness of the quality system put in place by the Constructor. The Superintendent shall be entitled to carry out the second or third party audits of the Constructor's quality system by: (a) reviewing Constructor's conformance to the project management plan; and (b) reviewing and verifying of the Constructor's quality procedures and work instructions and

documentary evidence of compliance with technical requirements of the contract.

10.4 Personnel Qualifications The handling, laying, jointing, trench filling and testing of all water mains, construction and testing of associated structures and installation of appurtenances, all concrete work and all excavation work, including tunnelling, must be performed and supervised by appropriately-qualified and/or appropriately-accredited personnel. Personnel shall hold minimum qualifications or specialist accreditation appropriate for the work undertaken. In particular Leading Hands and Supervisors must hold Statements of Attainment for Units of Competence (from either the Water Industry National Training Package NWP07, the Civil Construction Training Package RII09 or a training organisation’s training course/package acceptable to Council) pertaining to the particular tasks or work that they are engaged in. Qualifications from Training Packages shall be awarded by a registered training organisation. Registered training organisations shall be those listed by Training.gov.au (TGA) for the provision of training or assessment services as required. Prior to the commencement of any work Leading Hand and Supervisor qualifications must be submitted to the Superintendent. The Superintendent shall then submit all qualification/accreditation documentation to Council for Council review. Submission of all qualification/accreditation documentation to the Superintendent constitutes a HOLD POINT. The Superintendents review and acceptance of the nominated personnel to perform their nominated duties constitutes release of the Hold Point. Works must not commence until the Hold Point is released. Submission of all qualification/accreditation documentation to Council constitutes a WITNESS POINT. Council shall advise the Superintendent at the time of submission whether the Witness Point is to be exercised. If exercised, Council’s review and acceptance of the nominated personnel to perform their nominated duties constitutes release of the Witness Point. Works must not commence until the Witness Point is released.

11 GENERAL CONSTRUCTION 11.1 General (Add the following) The Contractor must provide all necessary plant, equipment, labour, and materials required to satisfy the intent and/or requirements of this specification. The Contractor must comply with the requirements of all relevant Authorities including, but not limited to, having regard for stormwater management, dewatering effects/impacts, silt control, noise abatement, proximity to existing buildings and the amenity of adjacent property owners. Excavations for structures and pipelines must be performed to the lines, grades and forms shown on the Drawings, or as directed by the Superintendent, and within the specified tolerances. 11.5 Protection Of People, Property And Environment 11.5.1 Protection of Other Services (Add the following) Prior to works commencing the Contractor must locate all existing utilities and services and protect them from damage and interference. Where it is necessary to relocate or alter any existing utility or service the Contractor must make all necessary arrangements with, and comply with the requirements of, the relevant authorities. Further to notification requirements, the Contractor must immediately repair damage to any existing utility or service to the satisfaction of the utility or service owner, the Council and the Superintendent. The Contractor is responsible for all costs associated with rectification of the utility or service regardless of the accuracy of any prior location information provided by the Superintendent, Council, the utility service owner or its agent. All costs associated with the location, protection, and repair of all services must be borne by the Contractor. 11.5.2 Disused / Redundant water mains (Add the following) Unless noted otherwise, existing water mains made redundant by the works must be removed. Unless noted otherwise, existing maintenance structures made redundant by the works must be removed. Existing valves and fittings made redundant by the works must be salvaged and given to Council. 11.5.4 Private and public properties (Add the following) Excavated materials must not be stockpiled against any fence or the walls of any building.

11.13 Affected Party Notifications (This clause 11.13 is a new clause) Ensure that all owners and residents of property directly and indirectly affected by the Works are notified in writing of the proposed Works before their commencement. For all notifications the period of notice must be 5 (five) working days.

12 PRODUCTS AND MATERIALS 12.1 Authorised Products and Materials (Add the following) 12.1.2 Pressure pipe-work and pipe fittings (This clause 12.1.2 is a new clause) Requirements for reticulation and trunk main pipe-work and fittings are as follows:

a) Polyvinyl Chloride (PVC) Pipe and Fittings

PVC pressure pipe must be;

i) PVC-M or PVC-O ii) Series 2 (compatible with ductile iron (DI) pipe) iii) rubber ring (elastomeric seal) jointed iv) Class PN16 (minimum) v) Blue in colour complying with AS4441 (neither lighter than RAL 200 90 10 or RAL 210

90 10 nor darker than RAL 200 80 25 or RAL 210 80 25) vi) compliant with Section SP4 of WS-SPEC

Fittings must be Ductile Iron. Pipes and fittings must be handled, transported and stored as per manufacturer’s guidelines.

Further to the requirements of AS2032 ‘Installation of PVC pipe systems’ all PVC pipes installed to operate in direct sunlight must be painted (primer coat and double top coat) with a light coloured water-based acrylic paint.

b) Ductile Iron (DI) Pipe and Fittings

Ductile Iron pipe and fittings shall be;

i) rubber ring (elastomeric seal) jointed or flanged ii) PE sleeved (Colour – Green) iii) cement mortar (type SR cement) lined or epoxy lined iv) Class PN35 v) compliant with Section SP2 of WS-SPEC.

Flanges shall be;

i) to Figures B5 & B6 of AS 4087, as appropriate ii) provided with Grade 316 SS bolts and Grade 304 SS nuts and washers

Pipe and fittings are to be handled, transported and stored as per manufacturer’s guidelines. Pipes and fittings cast into concrete must be treated, cleaned and prepared (including power-tool cleaned) in accordance with AS 1627.2 ‘Metal finishing – Preparation and pretreatment of surfaces Part 2: Power tool cleaning’.

c) Polyethylene (PE) Pipe and Fittings

PE Pipe and Fittings shall be;

i) electro-fusion, butt-fusion or compression joined ii) a minimum of class PN16 iii) a minimum Standard Dimension Ratio (SDR) of 17 iv) compliant with Section SP6 of WS-SPEC v) of either PE80B or PE100 polymer material. vi) compliant with WS-SPEC Section SP6 ‘Polyethylene pipes and fittings’.

Fittings shall be;

i) (for fittings ≤ DN110mm) - PE in accordance with AS4129 ii) (for fittings > DN110mm) - DI in accordance with AS2280 and coated internally &

externally with PE in accordance with AS4129

Pipe must be of the required internal diameter shown in the design drawings. Pipes and fittings are to be handled, transported and stored as per manufacturer’s guidelines.

d) Steel Pipe and Fittings Steel pipe and fittings shall be;

i) rubber ring jointed, flanged or welded ii) Fusion bonded polyethylene (FBPE, e.g. Sintakote) or epoxy coated iii) SR type cement or epoxy lined iv) Minimum wall thickness the greater of 6mm or diameter/120 v) Compliant with Section SP1 of WS-SPEC

Flanges shall be;

i) to Figures B7, B8 & B9 of AS 4087, as appropriate ii) provided with Grade 316 SS bolts and Grade 304 SS nuts and washers

Steel pipe must be provided with cathodic protection where specified.

Pipe and fittings are to be handled, transported and stored as per manufacturer’s guidelines.

e) Glass Reinforced Plastic (GRP) Pipe and Fittings

GRP pipes and fittings must only be used with Council approval on a project-specific basis. If approved, GRP pipe and fittings shall be;

i) joined with rubber ring (elastomeric) jointed couplings ii) of a minimum pipe stiffness rating of SN10 iii) a minimum of class PN16 pressure iv) compliant with WS-SPEC Section SP5 ‘GRP pipes and fittings’.

All exposed GRP pipe work must be painted (primer coat and double top coat) with a light coloured water-based acrylic paint. Pipes and fittings are to be handled, transported and stored as per manufacturer’s guidelines.

f) ABS Pipe and Fittings

ABS pipe and fittings shall be;

i) Solvent welded ii) minimum class PN16 pressure.

Joining of pipe shall be in accordance with the manufacturer’s instructions. Pipes and fittings are to be handled, transported and stored as per manufacturer’s guidelines.

g) Copper Pipe and Fittings

Copper pipe and fittings shall be;

i) manufactured in accordance with AS 1432 ii) in the range of DN6 to DN200 for Type A or Type B iii) insulated from ferrous mains iv) in compliance with AS3500 ‘Plumbing and drainage Part 2: Sanitary plumbing and

drainage’

Fittings shall;

i) comply with AS 3688 ‘water supply – Metallic fittings and end connectors’ ii) be de-zincification resistant iii) ,if capillary fittings, have silver brazed joints or solder insert capillary joints

12.1.3 Valves . (This clause 12.1.3 is a new clause) Requirements for valves are as follows:

a) General valve requirements

All valves are to be anti-clockwise close type.

Flange connections for valves shall be to AS4087 ‘Metallic flanges for waterworks purposes’ and have a minimum pressure rating PN16. Bolts shall be Grade SS316. Nuts and washers shall be Grade SS304.

All ferrous alloy (cast iron, spheroidal graphite cast iron, plain carbon and alloy steel) valves shall have protective epoxy coatings complying with WS-SPEC Section SP-30 ‘Protective Coatings for Valves’.

Oil valves and repack valve glands if directed by the Superintendent.

All parts requiring grease lubricating shall be fitted with hydraulic grease nipples.

Valves shall be drop tight in the closed position. The leakage rate shall not exceed that specified in the relevant Australian Standard.

An approved lifting attachment shall be incorporated on the body of the valve. The mass of the valve shall be stated.

Internal surfaces of valves shall be devoid of sharp protrusions which may initiate secondary cavitation at high flow velocities.

b) Knife Gate Valves shall be;

i) compliant with WS-SPEC Section SP23 ‘Knife gate valves’, ii) flanged unless noted otherwise on the Drawings.

c) Air Valves shall be;

i) compliant with WS-SPEC Section SP-27 ‘Air valves’, ii) a minimum size of DN80mm, iii) provided with an isolating sluice valve, iv) Ventomat (Council nominated make).

d) Sluice Valves shall be;

i) flanged unless shown otherwise on the Drawings, ii) resilient seated compliant with WS-SPEC Section SP-21 ‘sluice valves resilient

seated’.

e) Non-return (Reflux) Valves shall be;

i) Flexichek Resilient Sealed Non-return Valves without level arm and without counterweight,

ii) compliant with WS- SPEC Section SP-25 ‘Non-return valves’, iii) Crevet reflux valves (Council nominated make). For vendor supply pumping packages, the vendor nominated reflux valves system shall be acceptable.

f) Ball Valves shall be;

i) compliant with WS- SPEC Section SP-22 ‘Ball valves’, ii) flanged unless noted otherwise on the Drawings.

g) Butterfly Valves shall be;

i) only used with prior approval of Council, ii) if approved, compliant with WS-SPEC Section SP-24 ‘Butterfly valves waterworks

purposes’, iii) if approved, flanged, unless noted otherwise on the Drawings.

h) Scour Valves shall be;

i) sluice valves, ii) have assemblies as noted on the Drawings.

i) Spring Hydrants shall be;

i) compliant with WS-SPEC Section SP-28 ‘Spring Hydrant Valves’, ii) between 100mm and 200mm below finished surface level (from top-of-hydrant) -

achieved by the use of hydrant risers of various heights where necessary, iii) DN100 flanged spring type (SWASH) hydrants without isolating valves.

Pillar type hydrants shall be installed only where shown on the drawings.

Maximum spacing between hydrants shall be 80m.

j) Pressure Reducing Valves shall be;

i) compliant with AS4020 ‘Testing of products for use in contact with drinking water’ at a

scaling factor of 0.1, ii) flanged unless noted otherwise on the Drawings. iii) installed with isolating valves upstream.

12.3 Transportation, Handling and Storage of Products and Materials (Add the following) Notwithstanding manufacturer’s guidance advice, PVC, non-black PE and GRP pipes and fittings must be fully protected from sunlight at all times during handling and storage using a breathable shrouding material such as hessian. Black plastic must not be used to protect or shade pipes and fittings under any circumstances. 12.4 Rejected Products and Materials (Add the following) Pipes, fittings or materials, including coatings and linings, that are damaged or defective beyond the manufacturer’s described damage/defect limits, or those limits defined in the relevant Australian Standard, must not be used. Damage or defect includes, but is not limited to, delamination, scratching, distortion, chipping, thinning, deflection and cracking. 12.5 Concrete Works (Add the following) All concrete work must be compliant with;

a) WS SPEC Section SP43 ‘Cementitious materials for concrete’, b) WS SPEC Section SP44 ‘Concrete supply standard class’, c) WS SPEC Section SP45 ‘Concrete supply special class’, and d) WS SPEC Section TR10 ‘Concrete placement’.

Classes of concrete used for the construction of the works must be as detailed in Table 12.5.

Application Grade Minimum Cement Content (kg/m3)

Maximum W/C ratio

Blinding concrete, mass concrete

N15 - -

Surface footpaths & driveways

N25 - -

Unreinforced thrust blocks, anchor blocks, bulkheads & concrete encasement - all environments

N25 - -

Reinforced thrust blocks, anchor blocks, bulkheads & concrete encasement - all environments

N32 - -

Valve chambers & flow-meter pits – non-aggressive* environments

N32 - -

Valve chambers & flow-meter pits - aggressive* soil and groundwater environments

S40 (SR Cement) 380 0.50

Underground booster pump stations, building foundations - non-aggressive* environments

N32

Underground booster pump stations, building foundations - aggressive* soil and groundwater environments

S40 (SR Cement) 380 0.45

Table 12.5 – Concrete Properties

Aggressive* environments include environments where there is exposure to:

a) Seawater, anaerobic waters, swamp water tidal flats, sewage, effluent and the like, including exposure to intermittent saturation

b) Exposure Classification 3 (moderate), and greater (as defined in Appendix B of WS-SPEC Section SP-43 and considering levels of chlorides, sulphides, sulphates and pH).

Slump must be 90mm ± 10mm unless specified otherwise in the project specific WSA product specifications. Cementitious materials for concrete must be compliant with WS-SPEC Section SP43 Appendix B ‘Applications and environments’. Cover to reinforcement for water retaining structures must comply with the requirements of AS3735 ‘Concrete structures retaining fluids’. Cover to reinforcement for structures other than water retaining structures must comply with the requirements of the relevant Exposure Classifications within AS3600 ‘Concrete structures’ but must not be less than that required for C1 in aggressive environments and B1 elsewhere.

Concrete surfaces exposed to aggressive environments must be provided with a protective coating compliant with WS-SPEC Section TR-20 ‘Protective Coatings’. The protective coating applied must be in addition to the concrete cover requirements. All concrete work shall be supervised by a person (the Supervisor) experienced in all aspects of concrete construction. Refer to Section 10.2 for details of requirements. The Superintendent will inspect all formwork, reinforcement and pour location for each concrete construction (including thrust blocks etc.) prior to placement of any concrete. The Contractor shall be in attendance when the Superintendent inspects the work prior to concrete placement. All formwork, reinforcement, reinforcement supports, block-outs, excavations and preparations, and the like, must be in place, and the Superintendent notified, at least one full working day before concrete is scheduled to be placed in any section of the work. Inspection of the works by the Superintendent prior to concrete placement constitutes a HOLD POINT. Release of the Hold Point by signoff by the Superintendent following inspection is required prior to concrete placement at each concrete construction. Inspection of the works by Council prior to concrete placement constitutes a WITNESS POINT. Council shall advise at the time of notification by the Superintendent whether the option to inspect is to be exercised. If exercised, release of the Witness Point, by signoff by the Council, is required prior to concrete placement at each concrete construction.

13 EXCAVATION 13.1 Precautions (Add the following) Excavation work must be in accordance with the Safe Work Australia publication ‘Excavation Work – Code of Practice’. All instances of the word ‘should’ in the Code must be read as ‘must’. Safety barriers must be installed along the edges of open excavations and fenced pedestrian and vehicular accesses installed across trenches to maintain access to properties at all times. All installations must be adequately illuminated. 13.5 Support of Excavations (Add the following) Personnel engaged in work associated with excavation support must be competent and qualified in compliance with all statutory obligations. All excavation support must be designed by an RPEQ (Registered Professional Engineer Queensland) qualified engineer. Temporary excavation support must be left in place where its removal may endanger structures in the vicinity of the excavation. Steel excavation shoring and lining must comply with AS4744.1 ‘Steel shoring and trench lining – Design’. 13.9 Trench Excavation 13.9.1 General (Add the following) A horizontal distance of 600mm (minimum) must be maintained between the top edge of any excavation and the adjacent toe of any excavated material or stockpile. The minimum clear trench width (extending from the trench floor to a height of 150mm above the top of the pipe) must be as detailed in Table 13.2.

Nominal Pipe Size

(DN)

Minimum Trench Width (mm)

100 150 200 250 300 375 450 500 525 600 675 750 825 900

1100

600 600 600 800 900 900

1000 1200 1200 1200 1300 1400 1500 1600 2000

Table 13.2 – Minimum Trench Widths

Where trench shoring is used the clear trench width is measured between the internal faces of the trench shoring. 13.11 Foundations and Foundation Stabilisation (Add the following) Where foundation material shows any signs of movement, groundwater ingress or any other possible instability, and such instability cannot be controlled by conventional means, the foundation material must be assessed by the Designer for adequacy of structural support. If the Designers assessment recommends remedial works the remedial works must be detailed in writing by the Designer. 13.12 Surplus Excavated Material (Add the following) Excess spoil must be removed from the site and disposed of off-site at an approved location. Refer to Clause 11.5.6.5. If acid sulphate soils are identified treatment and management measures must be implemented in accordance with the Queensland State Planning Policy 2/02 Guideline ‘Acid Sulfate Soils’.

14 BEDDING FOR PIPES 14.1 Trench Floor Preparation (Add the following) Inspection of trenches by the Superintendent following completion of excavation constitutes a HOLD POINT. Release of the Hold Point, via signoff by the Superintendent, is required prior to commencement of pipe bedding, laying and jointing. Inspection of trenches by Council following completion of excavation constitutes a WITNESS POINT. Council shall advise at the time of notification by the Superintendent whether the option to inspect is to be exercised. If exercised, release of the Witness Point, by signoff by the Council, is required prior to commencement of pipe bedding, laying and jointing. 14.2 Bedding and Pipe Support Refer to Standard Drawing A3-00835 and others referring to ‘bedding material’. Bedding Material must be sand as defined in WSAA Product Specification WSA PS – 350 ‘Compaction Sand for Pipe Embedment’. Grade B must apply (as per AS2566.2 ‘Buried Flexible Pipelines – Part 2: Installation’, Appendix G, Table G3). ‘Crusher Dust’ (a waste product from the crushing process), whether further processed or not, is not permitted for use as Bedding Material. 14.3 Placement of Bedding (Add the following) Refer to Standard Drawing A3-00835.

15 PIPE LAYING AND JOINTING 15.1 Installation of Pipes 15.1.1 General Minimum depth of cover shall be in accordance with Standard Drawing A3-00835. Less depth of cover than that detailed on Standard Drawing A3-00835 may be permitted subject to provision of adequate pipe protection and approval by Council. The Contractor must not lay continuously welded steel pipelines parallel to, or in close proximity with, high voltage power lines. 15.1.3 Cleaning, Inspection & Joint Preparation (Add the following) Joints must be made such that the witness mark must, at no point, be more than 1mm from the end of the socket. Pipes, fittings, valves, and materials must be cleaned and examined jointly by the Contractor and the Superintendent prior to laying. Each pipe length must be suspended in a sling to facilitate a full inspection should the Superintendent instruct. Inspection of pipes, fittings, valves, and materials by the Superintendent prior to laying constitutes a WITNESS POINT. The Superintendent shall advise, at the time of notification by the Contractor, whether the option to inspect is to be exercised. If exercised, release of the Witness Point via signoff by the Superintendent is required prior to laying commencing. A mechanical pipe cutter must be used for cutting pipes other than PVC and PE in the field. PVC and PE pipes may be cut in the field using a power saw or a fine toothed hand saw and mitre box. Ends of field-cut pipes must be prepared in accordance with the manufacturer’s instructions, or as directed by the Superintendent. Witness marks must be made on field-cut pipes using a felt-tip marking pen at a position from the end of the pipe as specified by the manufacturer. Witness marks must not be scored into the pipe. Metallic pipes cut surfaces must be treated with protective coatings and linings equivalent to that on the pipe or appurtenance that has been cut. GRP pipe cut surfaces must be treated with a resin in accordance with the manufacturer’s guidelines. 15.1.4 Laying (Add the following) All laid and jointed pipes, including completed concrete works such as thrust blocks, must be inspected by the Superintendent prior to the commencement of trench backfilling (placement of embedment material above top of bedding). This action constitutes a HOLD POINT. The Superintendent’s approval of the laid and jointed pipes is required prior to the release of the Hold Point. Backfill must not be placed until release of the hold point. Inspection by Council of all laid and jointed pipes, including completed concrete works such as thrust blocks, prior to commencement of trench backfilling (placement of remaining embedment material

above top of bedding) constitutes a WITNESS POINT. Council shall advise at the time of notification by the Superintendent whether the option to inspect is to be exercised. If exercised, release of the Witness Point, by signoff by the Council, is required prior to backfilling commencing. Where PVC pipes are to be joined to ductile iron pipes, the joints must be made by inserting a PVC spigot into a ductile iron socket. Ductile iron spigots must not be joined to PVC sockets. Alternatively, multi-fit mechanical couplings or flanged adaptor couplings may be used to join pipes of different materials. Notwithstanding any minor irregularities in the ground surface, lay pipes on continuously rising grades from scour valve to air release valve. 15.2 Horizontal and Vertical Deflections of Pipes 15.2.2 Deflection at a Pipe Joint No joint shall be deflected to such an extent as to impair its effectiveness or tightness. 15.3 Horizontal and Vertical Separation of Crossing Pipelines (Add the following) Refer to Council Policy 063 ‘Clearances to Water & Sewerage Assets’. Water main trenches must not contain any other service pipe or conduit. Water mains must be located above any adjacent sewer line. 15.6 Flotation Control (Add the following) Flotation of pipes during laying, backfilling and testing must be prevented. Pipes that float or move must be removed and the pipeline re-constructed. Pipes that are removed must only be reused in the pipeline reconstruction provided they are undamaged and are inspected and accepted by the Superintendent for re-use. Temporary supports and restraints must be removed prior to completion of backfilling. 15.7 Thrusts & Anchor Blocks and Restrained Joints (Add the following) Refer to Standard Drawing A3-0836. Council consent is required for the use and type of restrained joints, as an alternative to thrust blocks, in congested service corridors and under urgent commissioning conditions. Provide temporary anchorages adequate to restrain the pipe when under hydrostatic test. Provide all other temporary anchorages and supports as required during construction.

15.9 Trench stops (Replace the contents of Clause 15.7 with the following) Refer to Standard Drawing A3-04285 ‘Trench Drainage – Bulkheads & Trenchstop’. Construct trench stops at the locations specified in the design drawings and, at minimum, in satisfaction of WS-SPEC Section TR-13, Section 4.10. 15.10 Bulkheads (Replace the contents of Clause 15.8 with the following) Refer to Standard Drawing A3-04285 ‘Trench Drainage – Bulkheads & Trenchstop’. Construct bulkheads at the locations specified in the design drawings and, at minimum, in satisfaction of WS-SPEC Section TR-13, Section 4.10. 15.11 Corrosion Protection of Cast Iron (Add the following) Refer to the Clause 12.1 (amended). All pipes and fittings must be sleeved with polyethylene film, adhesive tape (PVC), straps and buckles that comply with AS3680 ‘Polyethylene sleeving for ductile iron piping’. Sleeving must be installed in compliance with the requirements of AS3681 ‘Application of polyethylene sleeving for ductile iron piping’ and the pipe/fitting manufacturer’s instructions. Where requirements conflict AS3681 shall take precedence. 15.12 Marking Tapes 15.12.2 Detectable Marking Tape (Add the following) All water main construction must include placement of detectable marking tape. 15.13 Valves, Hydrants and Surface Fittings 15.13.1 Installation (Add the following) Valves shall be installed such that: (a) Operation of valves may be performed manually without the need for tools. Valves shall be capable

of opening against full unbalanced head, and closing against full flow, smoothly and without vibration or cavitations. The maximum effort required at the hand wheel under load shall not exceed 135 N.

(b) Valves and their actuators are easily accessible for maintenance purposes and are capable of being removed from their location in a pipeline without obstruction by the pipeline or other equipment.

(c) Hand wheels shall be clearly marked with the words ‘OPEN’ and ‘SHUT’ and adjacent arrows to indicate the direction of rotation to which each operation refers.

Valves and hydrants must be compatible with pipework to ensure that proper sealing is achieved between pipe flanges and valve flanges. Concrete lining in pipework must not be chipped away or reduced to provide clearance from the working parts of valves. Valves must be located to avoid conflict with property accesses, telecommunications service pits, electrical service pits and any other street side furniture. 15.13.2 Valve Chambers for Large Mains (Add the following) Cast iron maintenance hole covers (including cast iron concrete in-fill type covers) and frames must comply with AS3996 ‘Access covers and grates’. Cast iron maintenance hole covers and frames must not be delivered to the site until compliance with AS3996 has been demonstrated to the Superintendent. This action constitutes a HOLD POINT. Release of the Hold Point, by signoff by the Superintendent following review of the submission and confirmation of its adequacy by the Superintendent, is required prior to delivery. Concrete covers and frames are not permitted. Covers and frames must not be warped or twisted. Surfaces must be finished such that there are no abrupt irregularities and gradual irregularities must not exceed 3mm. Unformed surfaces must be finished to produce a surface that is dense, uniform and free from blemishes. Exposed edges must have a minimum 4mm radius. Cover dimension tolerances are –3mm/+0mm. Frame dimensions tolerances are ±3mm. Covers must be finished flush with the surface in roadways, footpaths and paved surfaces of any type. Elsewhere, covers must be finished 150mm above the surface of the ground unless otherwise directed. Bolt-down covers must be installed in areas subjected to 1 in 100 year flooding and elsewhere as shown on the Drawings. 15.15 Bored Pipes Under Roads, Driveways and Elsewhere (Add the following) Refer to the following Standard Drawings;

a) A3-04288 ‘Buried Crossings – Major Roadways’ b) A3-04289 ‘Buried Crossings – Railways’

Unless directed otherwise, encasing pipe must extend to a minimum of 1.0m behind back-of-kerb on each side of road carriageways. Pipelines must be fitted with pipe supports and the pipeline centrally located within the encasing pipe.

The annular space between the pipeline and the encasing pipe must not be filled or grouted except for the sealing of the ends of the encasing arrangement as detailed on the Standard Drawings. DICL pipeline enclosed within the encasing pipe need not be sleeved in accordance with Clause 15.9 (amended). Where a pipeline crosses a state-government controlled road, a watercourse or any landform, feature or structure under the control or jurisdiction of any Authority or Owner (the ‘Authority’), works must comply with the requirements of that Authority. The Contractor must provide written notification to the Authority of the intention to carry out the work and pay any applicable fees. The Contractor must then obtain the written authorisation to perform the work from the Authority prior to works commencing. A copy of the Authorities written authorisation must be supplied to the Superintendent. Submission of a copy of the written authorisation to the Superintendent constitutes a HOLD POINT. Release of the Hold Point, by signoff by the Superintendent, following submission of the written authorisation is required prior to works commencing. Submission, by the Superintendent, of a copy of the Authorities written authorisation to Council constitutes a WITNESS POINT. Council shall advise at the time of notification by the Superintendent whether the option to review the written authorisation is to be exercised. If exercised, release of the Witness Point, by signoff by the Council, is required prior to works commencing. Installation of pipeline by open trenching installation methods is not permitted over those pipeline lengths designated for installation by trenchless installation methods. Work Method Statements for trenchless pipeline installations must be submitted to the Superintendent and must address the following matters;

(a) General description of method and operation sequence (b) Size, invert depth and location of temporary access/work pits required. (c) Use of specialist subcontractors. (d) Specialist equipment to be used.

Submission of Work Method Statements to the Superintendent constitutes a HOLD POINT. Release of the Hold Point, by signoff by the Superintendent, following the review of Work Method Statements and confirmation of their adequacy by the Superintendent is required prior to works commencing. 15.18 Appurtenance Location Marking (This clause 15.22 is a new clause) Refer to Standard Drawing A3-00837 ‘Hydrant and Valve Installation’. Where no kerb, or kerb and channel, is located within 6m of a hydrant or a valve, and at all other locations noted on the design drawings, install marker stakes adjacent to the hydrant or valve. Where kerb, or kerb and channel, is located within 6m of a hydrant or a valve install kerb markings. Marker stakes material may be recycled plastic or in accordance with Council Standard Drawing A3-00837. Marker stakes must be coloured white. The location of pipes crossing roads shall be indicated by kerb markers. Refer to Standard Drawing A3-3873.

Pavement delineation of fire hydrants must be in accordance with section 1.25 ‘Fire hydrant indication system’ of the Queensland Department of Transport and Main Roads ‘Traffic and Road Use Management Manual’. The location of pipes crossing roads shall be indicated by kerb markers. Refer to Standard Drawing A3-3873. 15.20 Welding of steel water mains 15.20.1 General (Add the following) At welded joints apply either polyethylene heat shrink sleeves or a petrolatum tape wrap system in accordance with the manufacturer’s installation requirements.

16 PIPE EMBEDMENT AND SUPPORT 16.2 Embedment Materials (Replace the contents of Clause 16.2 with the following) Refer to Standard Drawing A3-00835. Embedment Material must be sand as defined in WSAA Product Specification WSA PS – 350 ‘Compaction Sand for Pipe Embedment’. Grade B must apply (as per AS2566.2 ‘Buried Flexible Pipelines – Part 2: Installation’, Appendix G, Table G3). ‘Crusher Dust’ (the waste product from the crushing process), whether further processed or not, is not permitted for use as Embedment Material. 16.3 Compaction of Embedment 16.3.1 Methods (Add the following) Compaction of embedment material using water flooding is not permitted. Embedment operations must not damage structures, pipes and fittings, pipe and fitting external coatings, pipe and fitting sleeving or produce any movement of structures, pipes or fittings. Damaged materials must be replaced. 16.6 Concrete Embedment and Encasement (Replace the contents of Clause 16.6 with the following) Concrete encasement of pipes is not permitted.

17 FILL 17.1 Trench Fill 17.1.1 Material Requirements (Replace the contents of Clause 17.1.1 with the following) Refer to Standard Drawing A3-00835 and others referring to ‘Trench Fill’ (or ‘Backfill or ‘Earth Fill’ which shall mean the same). Trench Fill within trenches not under new or proposed roadways, improved surfaces, trafficable areas or road reserves must be Ordinary Fill as defined by AS2566.2; that is, material obtained from the excavation, or imported, and containing not more than 20% by mass of rock with a size (any dimension) between 75mm and 150mm and none larger than150mm. Trench Fill within trenches under new or proposed roadways, improved surfaces, trafficable areas or road reserves must be Sand as defined by AS2566.2 (Appendix G, Table G3); that is, the same material defined as Embedment Material. Trench Fill within trenches under existing roads, improved surfaces, trafficable areas or road reserves must be a cement stabilised sand comprising Sand as defined by AS2566.2 (Appendix G, Table G3) and 5% cement by weight. 17.1.2 Placement (Add the following) Backfilling operations must not damage pipes and fittings, pipe and fitting external coatings, pipe and fitting sleeving or produce any movement in pipes and fittings. Damaged materials must be replaced. 17.1.3 Compaction of Trench Fill (Add the following) Compaction of trench fill material using water flooding is not permitted.

18 SWABBING 18.1 General All water mains must be swabbed. Water mains must be flushed prior to swabbing. Water mains must be flushed until the flushing water flowing from the water main flows apparently clear for a minimum period of 10 minutes. The water main undergoing swabbing must be ‘open-ended’.

19 ACCEPTANCE TESTING 19.3 Compaction Testing 19.3.2 Compaction testing requirements 19.3.2.4 Frequency and location of tests (Add the following) Test frequency requirement in this clause 19.3.2.4 take precedence over those noted in clause 19.3.2.2 and clause 19.3.2.3 Perform compaction tests 75mm to 100mm below the top surface of the fill layer to be tested. Fill material within a trench traversing existing, proposed or new roads and road reserves must be tested for compaction in at least one location in each 300mm of fill material depth along the trench length within the road or road reserve extents. 19.4 Hydrostatic Pressure Testing 19.4.1 General (Add the following) The performance of pressure testing in the presence of the Superintendent and Council constitutes a HOLD POINT. The Superintendent’s and Council’s presence during pressure testing and their sign-off of the test result certificates, as satisfactory, is required prior to the release of the Hold Point. Any failure, defect, visible leakage or excessive leakage detected during the Defects Liability Period shall be rectified by the Contractor at the Contractor’s expense. The system test pressure shall be a minimum of 1200kPa measured at the highest point in the test section. For DI, GRP, PVC and steel pipelines;

a) Prior to test pressurisation the water main and property services to be tested must be kept full of water for a period of not less than 24 hours.

b) The test pressure must be maintained for four (4) hours. c) The flow rate of make-up water necessary to maintain the test pressure, Q, must comply with

the following equation; Q ≤ 0.0105 D.L. (H) 0.5 where: Q = allowable make-up rate (litres per hour) D = nominal diameter of pipe (mm) L = length of section tested (km) H = average test head (m) 19.4.2 Mains Water mains shall be tested in sections approved by Council as soon as practicable after each section has been laid, jointed and backfilled, provided that:

(a) if so specified, or if the Contractor so desires, some or all of the pipe joints shall be left

uncovered until the whole of the section has been successfully pressure tested; and, (b) pressure testing shall not commence earlier than seven days after the last concrete thrust or

anchor block in the test section has been cast; and, (c) pressure testing shall not be carried out during wet weather unless approved by Council.

A test section is defined as a length of water main which can be effectively isolated for testing, e.g. by means of main stop valves. The length of water main tested in one test event must not exceed 1000 metres. Water mains of different diameter must be tested separately and must not be tested in the same test event. During testing all pipe joints which have not been backfilled must be clean, dry and accessible. During testing each stop valve must sustain, at least once and for at least 15 minutes, the full test pressure on one side of the valve in closed position with no pressure on the other side. 19.4.3 Property services Pressure test property services concurrently with the water mains to which they are connected. 19.7 Water Quality Testing 19.7.1 General (Add the following) The performance of water quality test sampling in the presence of the Superintendent constitutes a WITNESS POINT. The Superintendent shall advise, at the time of notification by the Contractor, whether the option to attend is to be exercised. If exercised, release of the Witness Point via signoff by the Superintendent is required. 19.8 Detectable Marking Tape (This Clause 19.8 is an additional sub-clause to Clause 19) Demonstrate detection of buried detectable marking tape in the presence of the Superintendent following completion of trench and structure backfill. Demonstrate at the rate of one in seven water main sections/structures. The performance of detection demonstrations in the presence of the Superintendent constitutes a HOLD POINT. The Superintendent’s presence during detection demonstrations and sign-off of the test results, as satisfactory, is required prior to the release of the hold point. The performance of detection demonstrations in the presence of the Council constitutes a WITNESS POINT. Council shall advise at the time of notification by the Superintendent whether the option for Council to inspect the detection demonstrations is to be exercised.

20 DISINFECTION 20.1 General Water mains must be disinfected after successful completion of testing and swabbing. Disinfection must be performed by a service provider who is independent of the Contractor and is approved by Council. Water quality testing must be performed following disinfection. The performance of disinfection in the presence of the Superintendent constitutes a WITNESS POINT. The Superintendent shall advise, at the time of notification by the Contractor, whether the option to inspect is to be exercised. Release of the Witness Point via signoff by the Superintendent is required.

22 CONNECTIONS TO EXISTING WATER MAINS 22.1 General All connection to existing water mains must be undertaken by Council at the Contractors expense. A cost estimate of the works to be undertaken by Council will be provided to the Contractor and the connection will not be made until the payment is made to Council. An undertaking to pay the actual costs of the work, signed by the Contractor, must accompany the payment. The Contactor must provide Council, affected neighbouring residents and the Superintendent with 5 working days notice of the proposed connection commencement date. Connections to existing pipes in-service shall be made at such times as will cause the least interference with the supply.

23 RESTORATION 23.1 General (Add the following) References to ‘trench’ in this Clause 23 amendment shall also be read as ‘excavation’. 23.2 Pavements (Add the following) Final restoration of pavements must include the removal of temporary restoration works. Backfilling must restore full support to those structures or surfaces (including kerb and channel, road pavements or other improved surfaces) tunnelled under in lieu of trenching. 23.6 Provision for and rectification of settlement (Add the following) Further backfilling must be carried out, or the original backfill trimmed, at the end of the Defects Liability Period so that the surface of the completed trench matches design and/or adjacent finished surface levels. Subject to Council approval, and to the satisfaction of the Superintendent, material excavated from trenches and surplus to backfill requirements may be disposed of by spreading neatly in the vicinity of the trench in such a way as to avoid future erosion of the backfill and adjacent ground surfaces. Trench backfill finished surfaces must be levelled at the time of backfilling where the reasonable convenience of persons would be impacted upon if the backfill was left ‘high’. Subsequent settlement must be made good by additional filling at the time that the settlement becomes apparent. 23.7 Maintenance of restored surfaces (Add the following) Backfill and adjacent areas must be maintained throughout the Defects Liability Period.

24 WORK AS CONSTRUCTED DETAILS (Add the following) Refer to Council’s construction specification C101 ‘General’ and Council’s engineering design guideline D20 ‘Drawings and Documentation Guidelines’. Further to the requirements of C101 and D20, as-constructed Drawings must show;

1. maintenance structure location (perpendicular distances to property boundaries), type, level 2. water main locations/alignments, size, type and levels 3. Fitting type and location. 4. water service locations 5. easement extents

Structures represented on design drawings and removed during the works (including but not limited to pipe, fittings, pavements etc.) must not be represented on the as-constructed drawings. Structures represented on design drawings and made redundant during the works (including but not limited to pipe, fittings, pavements etc.) must be noted as ‘redundant’ on the as-constructed drawings. Areas of side-fill which contribute to the structural integrity of pipelines of a diameter greater than 225mm must be shown on the as-constructed drawings as areas not be disturbed without performance of an appropriate risk assessment.

Appendix A (Not used)