wsa 03-2002 water supply code of australia (hunter water edition ...€¦ · wsa 03-2002 water...

of 54

WSA 03-2002 Water Supply Code of Australia (Hunter Water Edition) Version 1

Comparison with

WSA 03-2011 Water Supply Code of Australia (Hunter Water Edition) Version 2

PART 2

CLAUSE WSA 03-2011 (Hunter Water Edition) Version 2 WSA 03-2002 (Hunter Water Edition) Version 1

10 General

10.1 Scope Delete existing clause

Insert new clause as follows:

This Part of the Code provides default requirements for the construction of water mains and

associated components and structures .

This document should be read in conjunction with relevant Water Agency supplementary

manuals, development agreements, specific project contract documents, general conditions of

contract (e.g. AS 2124) and other documents nominated by the Water Agency.

This Part of the Code complements the Standard Drawings in Part 4 to provide default

requirements for the construction of water mains and associated components and structures.

10.2 Interpretation Delete existing clause


For the purposes of this Part the following interpretations shall be applied:

"authorised" means acceptable to, authorised by or approved by the Water Agency or

Owner or Regulator.

“Constructor” means the individual, corporation or legal entity including any contractors

and sub-contractors that is accountable at law for delivery of Works under a specific

contract or development agreement.

“Design Drawings” are deemed to be plans and drawings, developed and endorsed by a

designer(s); they are an integral part of job/project instructions/specifications to a

competent constructor, exercising duty of care. Design Drawings typically show details

determined by calculation, or otherwise, that satisfy relevant specifications, codes,

standards, regulations, geotechnical and site constraints. As appropriate, Design Drawings

show the location of proposed works, existing and/or proposed roads, water and sewer

mains, property services, site plans including lots, boundaries and/or other relevant

information.

“improvements” are deemed to include but not be limited to pavements, shrubs, gardens,

retaining walls, fences and all other structures.

"Owner” means the Agency, Authority, Board, Company, Controlling Authority,

Corporation, Council, Department, Individual, Regulator, Utility or other legal entity who is

the owner of the asset and/or who has responsibility for the asset.

"Part" means the Water Supply Code of Australia Part 2: Construction.

“Product Specification” means the WSAA Product Specification detailing the

requirements for the supply of a product or material (Refer to www.wsaa.asn.au).

“Recognised Testing Laboratory” means a laboratory competent to conduct applicable

product tests and –

(i) accredited by the National Association of Testing Authorities (NATA) having a scope

of accreditation covering the testing requirements of the applicable specification(s);

or

Unless specifically stated otherwise, construction of the water mains includes all functions

described in this Part and the provision of any minor materials and services, which are not

described but are reasonably necessary to produce a fully functional water supply and

reticulation system.

For the purposes of this Part, except where otherwise shown:

“Constructor” means the legal entity accountable at law for delivery of Works under a

particular contract or development agreement.

“Design Drawings” means the drawings depicting the Works to be constructed for the

particular project in hand.

"Owner” means the legal entity who is the owner of the asset and/or who has responsibility

for the asset.

"Part" means Part of the Water Supply Code of Australia Hunter Water Edition.

“Product Specification” means the WSAA Product Specification, Hunter Water Edition

detailing the requirements for the supply of a product or material.

“Regulator” means one who has the power to enforce statutory Regulations.

“Specification” means the Specification detailing the work involved in the particular project

in hand.

“Specified” means as specified in the Specification, Design Drawings, Product

Specifications.

"Standard Drawings" means the Water Supply Code of Australia Hunter Water Edition

Part 4: Standard Drawings.

“This Part” means the Water Supply Code of Australia, Hunter Water Edition Part 3:

Construction.

“Water Agency” means Hunter Water.

“Works” means the physical assets being constructed as part of the particular project in

hand.

Specific requirements, including those in the Specification and Design Drawings, shall take

precedence over general requirements.

http://www.wsaa.asn.au/

of 54


(ii) accredited by an International Laboratory Accreditation Cooperation (ILAC) Mutual

Recognition Arrangement (MRA) signatory and having a scope of accreditation

covering the testing requirements of the applicable specification(s);

or

(iii) recognised by the Water Agency following evaluation of the laboratory’s compliance

with the applicable requirements of ISO/IEC 17025.

“Regulator” means a Regulator who has the power to enforce Regulations related to the

activities and responsibilities of a Commonwealth, state, territory or local government. It

applies to environmental management and protection, occupational health and safety and

the like.

“Specification” means the Specification detailing the work involved in the particular project

in hand.

“specified” means as specified in the Specification, Design Drawings, Product

Specifications and/or by the Superintendent.

“Superintendent” means the individual appointed by the contract principal as an

independent arbiter of contract directions, issues, claims and variations.

“Tester” means an individual, corporation or legal entity that is accountable at law for

delivery of testing services under a specific contract with the Constructor.

“Water Agency” means an authority, board, business, corporation, council or local

government body with the responsibility for planning or defining planning requirements, for

defining and authorising design requirements, for defining and authorising construction

requirements and for operating and maintaining or defining operation and maintenance

requirements for a water supply and/or sewerage system or systems.

“Works” means the physical assets being constructed as part of the particular project in

hand.

Headings are for the convenience of the reader and shall not be used in the interpretation of this

Part. Italicised text is commentary to default requirements .

Headings are for the convenience of the reader and shall not be used in the interpretation of this

Part.

11 General Construction

11.1 General Insert new clause as follows:

Consult with the Designer to ascertain the results of the “all hazards risk assessment” and the

control measures required to be undertaken to address each risk and/or hazard prior to

commencement of works and/or during construction.

The design process and outputs should comply with requirements detailed in Construction

Hazard Assessment Implication Review (CHAIR) – Safety in Design Tool published by

WorkCover (available at www.workcover.nsw.gov.au/publications/pdf/chair.pdf .

Do not commence work until detailed Specifications and Design Drawings are available.

Prior to commencing construction in filled areas, mine subsidence areas, potentially unstable

(slip) areas, areas containing acid sulphate soils and/or areas affected by salinity and any areas

of concern to construction, consult the Designer to confirm special requirements.

Construct the water supply transfer, distribution and reticulation Works to the lines, levels, grades

and in the locations using the materials and methods as specified.

If insufficient detail or instruction is provided within the Design Drawings or Specification, seek

instruction from the Designer prior to the commencement of the works.

Not used

http://www.workcover.nsw.gov.au/publications/pdf/chair.pdf

of 54


Use only the types, materials, sizes, lengths, classes, jointing methods and corrosion protection

systems for the pipes, fittings and maintenance structures as specified. Use only manufacturers

products and product range authorised by the Water Agency.

For pipelines ≥DN 375 using pipes of stiffness class less than SN10 (i.e. <10,000 N/m/m),

regularly monitor the soil and ground water conditions along the route of the pipeline to a depth

at least equal to the design foundation level. Where the pipe stiffness class is not marked on the

pipe or the Design Drawings, consult with the Designer to ascertain pipe stiffness class. Where

conditions vary from the design assumptions, provide data to the Designer for assessment and

modification of the design as necessary.

11.2 Order of Construction, Testing and Commissioning


Undertake and complete all Works in accordance with the following process:

(a) Install all Works in accordance with the Design Drawings and the Specification and collect

Work As Constructed information as work proceeds.

(b) Clean main(s) and property service(s) by either swabbing and flushing, air scouring or high

velocity flushing.

(c) Conduct acceptance testing.

(d) Disinfect the main(s) and conduct acceptance testing.

(e) Connect the main(s).

(f) Charge and commission the new main(s).

Not used

11.3 Contract Interfaces Insert new clause as follows:

Adopt the contract interfaces as indicated on the Design Drawings and/or Specification. If in

doubt, obtain clarification from the Superintendent. Where the Constructor is required to connect

or fit to existing infrastructure provided by Water Agency and/or any other Agency, check all

relevant measurements on site, notwithstanding the dimensions shown on the Design Drawings,

and adjust work to fit as required.

Not used

11.4 Customer Focus

11.4.1 General Insert new clause as follows:

Ensure that the execution of the Works complies with the Water Agency's "Requirements for

customer service”.

Fully brief all affected customers and property owners about the impact of the Works on buildings,

garden features, trees and vegetation, noise levels, out of hours work, traffic restrictions, etc.

before commencing work.

Keep documented evidence of contact details with all affected customers.

It is the aim of the Water Agency to achieve a high level of customer understanding and co -

operation in the construction process resulting in high satisfaction levels.

Not used

11.4.2 Resolution of complaints


Resolve enquiries and complaints promptly, sensitively and in accordance with the Water

Agency’s “Requirements for customer service”.

Keep the Superintendent informed and fully briefed of any contentious issues raised about the

Works.

Not used

11.5 Protection of Property and Environment

Insert new clause as follows: Not used

of 54


11.5.1 Protection of other services Prior to excavation, contact Dial Before You Dig by visiting www.1100.com.au or by telephoning

1100 to determine or reconfirm the presence and location of underground services. Before work

commences, ensure plans of all relevant services are available on site .

Implement special precautions where excavations are to be undertaken near any other structures

or services including petroleum pipelines, gas pipelines, overhead and buried electricity and

communication cables, drains, sewers and water mains. For these assets and any other services:

(a) Comply with the notification requirements and construction conditions as specified.

(b) Prove the location of all underground services (e.g. by potholing).

(c) Take special care to ensure that other services are protected in accordance with the

conditions specified by the service Owner.

(d) As appropriate for critical services, arrange for a representative from the service Owner to

be present, unless the service Owner directs otherwise.

(e) Arrange for isolation and subsequent restoration of any service that needs to be removed

from service while the Works are in progress.

(f) Adopt an appropriate method for exposing and protecting the service from damage if the

service is to be exposed. Use construction techniques (e.g. trench support systems) that

prevent disturbance to adjacent structures and services.

Industry practice is generally to hand dig and locate underground services prior to machine

digging. Alternatively, location by vacuum potholing may provide a more efficient means

in congested pipe corridors.

(g) Immediately notify the owner or responsible authority of any damage or interference to any

service, structure or property.

If a service is damaged during construction, arrange or perform repair to the satisfaction

of the Owner. Obtain from the Owner, a certificate stating that the repair has been carried

out to their satisfaction.

If the Owner cannot be located within a reasonable time, report the damage to the

Superintendent, and arrange or perform repair to an approved standard. Do not backfill,

cover up or make the repair inaccessible prior to obtaining authorisation from the

Superintendent.

(h) Notify the Superintendent of any interference to the Works caused by an existing service

and the proposed action.

11.5.2 Disused/redundant water mains


Take action regarding disused water mains as specified, typically:

(a) Pipes:

Remove any “Tee” fitting from any existing main to be disused.

Plug and/or seal all openings on disused mains against water infiltration.

Seal existing flanges with bolted and gasketed blank flanges.

Seal cut pipe ends with caps, gibault caps or similar.

Plug open pipes as required with suitable concrete or premix.

(i) Alternatively, or where specified in the Design Drawings, fill all disused water mains

with grout. The grout shall be a lime-cement slurry consisting of six parts cement

Not used

http://www.1100.com.au/

of 54


to one part lime. “Flowable Fill” (e.g. Liquidfill or Levelfill) possibly with the addition

of a plasticiser to aid flow is an acceptable alternative to grout.

In the case of asbestos cement (AC) pipes, comply with the Water Agency’s requirements

that might include:

(A) Disused AC pipes in private property are to be removed.

(B) Disused AC pipes in public property need not be removed, provided they will

not interfere with the operation and/or maintenance of other services.

(C) If AC pipes are to be removed, complete pipes should be removed where

possible, wetted while being extracted, and sealed in plastics sheet(s) or bags

for disposal. Appropriate PPE should be worn.

(D) Cutting of collars and pipes should be by wheeled pipe cutter and/or hammer

and chisel, as appropriate, while the collar or pipe is wetted. An abrasive disc

cutter shall not be used.

(E) Disposal of asbestos waste shall be in accordance with relevant regulations.

(b) Valves:

(i) Remove all valves, surface boxes and surrounds and restore the surface in

accordance with Clause 23.

(ii) Close all valves and remove or cut off spindles as near to top of valves as

practicable.

(iii) If broken, seal any openings to prevent water infiltration.

(iv) Remove all valve gear boxes.

(c) Hydrants (including fire plugs, flushing points and washouts):

(i) Remove all hydrants, fire plugs, flushing points, washouts, surface boxes and restore

the surface in accordance with Clause 23.

(ii) Remove hydrant risers as far below finished surface level as practicable.

(iii) Seal hydrant riser with blank flange if practicable, otherwise seal with suitable

concrete or premix.

(iv) Remove all disused hydrant markers and indicators, including hydrant marker posts,

painted markers, blue reflectors, etc.

(d) Scours

(i) Remove all scour valves, chambers, scour pipework and outlet structures and

restore the surface in accordance with Clause 23.

(ii) Remove all disused markers and indicators.

(e) Tappings/services:

(i) Turn all disused ferrules off, if practicable.

(ii) Crimp copper services and seal or plug all other disused services.

11.5.3 Road reserves or other thoroughfares

11.5.3.1 Road opening permits


Obtain a road opening permit from the road Owner (e.g. Council) prior to commencement of any

works within a road or road reserve.

Not used

of 54


Manage traffic in accordance with requirements and guidelines set out in the NSW Streets

Opening Coordination Council (SOCC) Guide to Codes and Practices for Street Opening

(available at www.streetsopening.com.au).

11.5.3.2 Treatment of pavements and other surfaces


Any pavement or surface of any road, driveway, footway, nature strip, median strip, kerb, gutter,

channel or any other thoroughfare disturbed as a result of the Works, shall be:

(a) Continuously maintained as far as practicable, for the duration of the Works.

(b) Restored to its original surface and material condition and to the satisfaction of the Owner

of the pavement/other surfaces.

Restore the surface of unpaved streets before they are reopened to traffic.

Restore the surface of any excavation in a sealed road, footway or other pavement or provide a

temporary bituminous seal before reopening it to the public.

Not used

11.5.3.3 Cleanliness of roads, paths, accesses and drainage paths


Keep the surface of all roads, footways, drainage paths and any access through public and

private lands clear of any build-up of debris such as clay, sand and the like, resulting from plant

used on the site. Ensure the exterior of all machinery and plant working on or crossing roadways

is free of all construction debris in accordance with relevant regulation.

Not used

11.5.3.4 Storage of products, materials and equipment


Locate and store all products, materials, equipment and excavated material in accordance with

the requirements of the relevant storage site Owner (Refer also to Clause 12.3.4).

Not used

11.5.3.5 Obstruction of street drainage


Protect all drains, channels or gutters from any obstruction using silt traps, sediment control and

other means as appropriate in accordance with the environmental Regulator’s requirements

(Refer to Clause 11.5.5.4).

Not used

11.5.4 Private and public properties


Generally, the Superintendent is responsible for negotiating any access that is necessary to

actually construct the Works through private or public land.

Where work is carried out in private property or lands owned by Councils or other authorities,

whether in an easement, reserve or otherwise:

(a) As far as practicable confine operations to easements or reserves. If there are no

easements or reserves, or the area of the easement or reserve is inadequate, confine

operations to an area agreed upon with the Owner.

(b) Comply with the Water Agency requirements for resolution of any dispute associated with

access or entry rights to the Works.

(c) Minimise damage to existing vegetation and improvements.

(d) Obtain the Owner's written permission for storage of materials, equipment or excavated

material for Works on any of Owner's land.

(e) Replace damaged conduits with the same or agreed equivalent material and authorised

connectors. Repair and/or replace all property and environmental damage caused by the

Works to the satisfaction of the Water Agency or owners.

(f) Remove all facilities for the Works from the site within the time frame specified or agreed.

Not used

http://www.streetsopening.com.au/

of 54


(g) Restore all services, drains, fences, structures, surfaces and improvements affected by

the Works to the original surface and condition to the satisfaction of the Owner, and within

the time frame specified or agreed.

11.5.5 Protection of the environment and heritage areas

11.5.5.1 General


Take all necessary measures to protect the environment and heritage areas and comply with

specific environmental management requirements identified in the project REF or EIS. In the

absence of specific requirements being stated in the contract or development agreement,

address relevant aspects of the general environmental management requirements of the Water

Agency.

Not used

11.5.5.2 Collection and disposal of wastes


Provide, operate and maintain adequate facilities for the collection, transportation and disposal

of liquid wastes including portable toilet wastes, fuels, lubricants, oils and greases.

On no account allow any untreated liquid waste to discharge to the ground surface of the site or

into any drain or open area. Ensure that no contamination of the soil occurs and that all sludge

and solid material is removed and disposed of safely and lawfully.

On Works completion, completely remove all the storage and treatment facilities.

If soil pollution occurs, remove all contaminated material from the site and dispose of in

accordance with the requirements of the Water Agency and relevant Regulators.

Not used

11.5.5.3 Protection of adjacent lands and vegetation


Confine all operations associated with the construction Works to the designated Works area

either within roadway reserves or enclosed by temporary and existing fences.

Fence all stockpile areas.

Make every attempt to minimise impact of the Works on adjacent areas and cooperate with the

owners / occupiers of adjacent land to minimise inconvenience.

Protect trees, shrubs and grasses outside the Works area by appropriate site management and

fencing.

Comply at all times with any Council requirements regarding vegetation, which may include

having to obtain town planning permits.

Only remove or trim trees and shrubs if essential for the Works. Where specified:

(a) treat all cut branches and roots with a suitable fungicide; and/or

(b) collect seeds from existing vegetation for use during restoration (Refer to Clause 23.5);

and/or

(c) employ a qualified bush regenerator to weed the Works area prior to commencement to

prevent the spread of weeds during construction.

Stockpile vegetation separately on geotextile filter fabric when the line is initially cleared for use

during restoration (Refer to Clause 23.5). Similarly, if present, stockpile bush rock separately

during the initial clearing of the line.

Do not remove trees and shrubs on or adjacent to the Works without obtaining prior written

permission from the Owner and where appropriate, the Council and replace as required / agreed.

Lop trees and prune shrubs in a professional manner using appropriate tools to the extent

authorised by the relevant Owner before Works commencement.

Not used

of 54


Suitably dispose of all debris from the cutting, pruning, lopping of trees and shrubs, including

removing trunks and roots.

11.5.5.4 Control of water pollution


Prior to work commencing, develop and provide to the Superintendent, or other approving

authority, an erosion and sediment control plan (or soil and water control plan) for the site.

The plan shall outline:

(a) Measures to be taken to minimise erosion and to trap sediment in any water leaving the

site.

(b) Defined access locations to the worksite.

(c) Location of stockpiles of excavated materials, fill and other erodable materials.

(d) Procedures for construction and rehabilitation activities to minimise erosion and sediment

transport.

(e) Procedures for monitoring, maintaining and removing erosion and sediment control

measures.

(f) Procedures to trap and dispose of excess water during testing, disinfection and swabbing

of the completed Works.

Implement the requirements of the approved plan and comply with all applicable Commonwealth,

state, territory and local government laws, regulations and codes of practice.

In order to control water pollution and meet the emission limits for waste discharges to water

specified in applicable Regulations and/or Policies of the relevant Regulator:

(iv) Comply with the requirements of applicable documents such as:

(A) Department of Conservation & Land Management, WA “Urban Erosion and Sediment Control”, 1992.

(B) Department of Housing, NSW “Soil and Water Management for Urban Development”, January 1993.

(C) Department of Environment & Climate Change NSW “Managing Urban Stormwater Soils and Construction Volume 2A Installation of Services”, January 2008.

(D) Environment Protection Authority (SA) “Code of Practice for Local, State and Federal Government”, November 1997.

(E) Environment Protection Authority (Vic) “Construction Techniques for Sediment Pollution Control” Publication No. 275, May 1991.

(F) Environment Protection Authority (Vic) “Environmental Guidelines for Major Construction Sites” Publication No. 480, December 1995.

(G) Institution of Engineers, Australia, Queensland Division “Soil Erosion and Sediment Control”, June 1996.

(H) RTA (NSW) “Road Design Guide”, Section 8 – Erosion and Sedimentation, April 1993.

(I) Vic Roads “Road Design Guidelines”, Part 7.6 Drainage, August 1996.

(v) Ensure that the turbidity in receiving waters does not exceed environmental quality

objectives as specified. To achieve this, it may be necessary to:

Not used

of 54


(A) Adequately plan, install and maintain the sediment control of the construction

site and ensure that construction activities such as excavating and dewatering

do not result in turbid water entering drainage networks.

(B) Implement daily monitoring of the turbidity of water pumped directly to a natural

waterway or a drainage system discharging to a natural waterway.

(C) Supervise all pumping and implement precautions to minimise the turbidity of

pumped water.

(vi) Adopt practices to ensure that turbid water does not enter the drainage systems.

Suggested practices could include, but are not limited to:

(A) Construction of detention basins and settling ponds particularly on larger sites.

(B) Discharge of silt laden waters onto vegetated areas of suitable size and slope

to filter out suspended silts.

Where land is not available or suitable for settling ponds and/or vegetated filter

strips, then silt laden water may need to be subject to a specifically designed physical

filtration and/or chemical flocculation system to remove suspended silts.

(vii) Consult the Superintendent for endorsement of the proposed options prior to

commencing construction. Suggested options/methods that the Constructor may use

to achieve the measures are as follows:

(A) Hessian bags (sausages) filled with crushed rock laid across gutters in series

as required.

(B) Temporary culvert/side entry pit entry consisting of planks of timber around

culverts/side entry pits with either geotextile filter fabric or gravel behind timber

or both to allow water to pass through retaining the silt.

(C) Silt fences consisting of geotextile filter fabric reinforced with mesh and

crushed rock.

(D) Side entry pits consisting of plugged side entry pits with discharge into pit and

disposal at sites where other controls have been installed, which may require

transportation of water off site.

(E) Site baffle tanks designed to manage the site flows.

These options/methods only represent a few of what are available and the

Constructor may use others that exist. The Superintendent will need to approve any

such options/methods that the Constructor decides to use.

(viii) Maintain stockpiles of spoil and materials at a minimum and locate clear of footpaths

and street channels.

Take necessary measures to prevent sediment from these stockpiles entering the

drainage system. Suggested practices could include, but are not limited to:

(A) Tarpaulins or plastics sheeting over the stockpiles.

(B) Storage bins.

(C) Use of timber toe boards around the stockpiles.

(ix) Use suitable methods on construction sites when dewatering and road cleaning/

jetting.

Do not limit sediment control in residential streets to placement of hay bales.

of 54


If all known on-site treatment methods are unsuitable or impracticable, remove the turbid and silt

laden water by tankers for treatment and disposal at an appropriate wastewater treatment facility.

11.5.5.5 Contaminated soils


Prior to work commencing, determine whether the Design Drawings indicate the presence of acid

sulphate (or potential acid sulphate) soil or other naturally occurring or introduced contaminants

(such as urban salinity) within the soil to be excavated. Where such contaminants exist, adhere

to requirements of the relevant planning authority and/or the environmental Regulator and take

appropriate measures during excavation, storage, transport and disposal of soil and filling of the

trench, to ensure that contaminants are treated on-site or at an authorised remote location.

Not used

11.5.5.6 Fire ant areas Insert new clause as follows:

Fire ants are dangerous imported pests that could spread to large areas of Australia, severely

damaging the environment, our outdoor lifestyle and agriculture and tourism industries. The

national fire ant eradication program (NFAEP) is a national program funded by all Australian

states and territories, as well as the federal government, and implemented by the Biosecurity

Queensland.

Prior to work commencing, determine whether the Design Drawings indicate a fire ant restricted

area. Where the works are within a fire ant restricted area, adhere to requirements of the relevant

regulator and take appropriate measures during excavation, storage, transport and disposal of

soil and filling of trench, to ensure that fire ants are treated.

Not used

11.5.5.7 Control of noise and atmospheric pollution


Comply with relevant Regulator requirements for mitigating noise and atmospheric pollution.

Operate all plant and construction equipment such that it does not cause undue noise or

atmospheric pollution.

Fit compressors, air tools, generators and other plant as necessary with appropriate silencers.

Take all necessary measures to prevent dust generation on the site and in particular its sp read

to adjacent areas.

Not used

11.5.5.8 Equipment and machinery use in bush fire prone areas


On days of total fire ban, do not undertake operations such as cutting, grinding, welding, gas

cutting and use of machinery such as motorised machinery and chainsaws.

Do not undertake any activity prescribed by the relevant Fire Service unless an exemption has

been granted.

For further information, visit www.bushfire.nsw.gov.au.

Not used

11.6 Operation of Water Supply Network


Do not operate any item of the water supply network unless authorised or directed to do so by

the Water Agency.

Adhere to Water Agency notification requirements and operating procedures.

Not used

11.7 Alteration of Existing Services


Carry out alterations to other services as Specified.

Not used

11.8 Connection to and Work on Existing Asbestos Water Mains


http://www.dpi.qld.gov.au/4790_6653.htm

http://www.dpi.qld.gov.au/4790_6653.htm

http://www.bushfire.nsw.gov.au/

of 54


Where work on and contact with asbestos cement pipelines is necessary or occurs, comply with

the legislative requirements of the relevant Occupational Health and Safety Regulations

applicable to asbestos (cement) and relevant Regulatory requirements for transport and disposal

of waste asbestos materials.

11.9 Cut-In Connection Equipment


Equipment and machinery used for under pressure cut-in connections shall be:

(a) Authorised by the relevant Water Agency.

(b) In good condition and mechanically safe.

(c) Capable of installing corrosion inhibiting plastics inserts to protect the cut surface of

metallic pipes for holes up to and including 150 mm diameter.

(d) Capable of removing the cut section of pipe (coupon) and allowing the expulsion of all

swarf from the pipe system.

(e) Include a complete range of hole saws and pilot drills appropriate to the pipe material to

be drilled.

Not used

11.10 Survey Marks Insert new clause as follows:

Maintain all state and territory survey marks in their correct position.

When such survey marks are disturbed, re-establish or reinstate the marks to the requirements

of the relevant Regulator.

Not used

11.11 Construction Tolerances


Adhere to tolerances specified in Section 21.

Not used

11.12 Latent Conditions Insert new clause as follows:

Obtain instruction from the Superintendent regarding latent site conditions and obstacles that

impact on the project, such as:

(a) Where mains or water services cannot be laid to achieve the minimum specified cover over

the top of the pipe barrel or clearance distances from other services.

(b) Ground conditions.

(c) Disused pipelines.

(d) AC pipes.

(e) Contaminated soils.

(f) Cultural and/or natural heritage items.

(g) Sensitive environmental aspects (e.g. hanging swamp).

Not used

12 Products and Materials

12.1 Authorised Products and Materials

12.1.1 General

Delete existing clause


Use only products and materials specified by the Project Specification or Design Drawings.

Products and materials may be specified by name, type, class etc. if included on relevant Hunter

Water’s lists of Approved Products and Manufacturers or may be specified by reference to a

Hunter Water Product Specification or alternative Water Agency approved specification.

Select materials from Hunter Water’s lists of Approved Products and Manufacturers which can

be accessed at the website www.hunterwater.com.au.

Where suitable materials are not listed, submit full technical details of alternative items and

obtain written approval prior to use.

All product and materials shall comply with the Product Specifications that are referenced in

Section IV of Part 0.

http://www.hunterwater.com.au/

of 54


Select materials from Hunter Water’s lists of Approved Products and Manufacturers which can

be accessed at the website www.hunterwater.com.au.

Where suitable materials are not listed, submit full technical details of alternative items and

obtain written approval prior to use.

Comply with all recommendations of the manufacturers regarding transport, storage, handling

and installation of the materials.

12.2 Delivery Inspection of Products and Materials


Inspect all products and materials at the time of delivery.

For dual water systems, ensure products are colour coded and/or specially marked products as

specified.

Quarantine any product or material not specified by the Project Specification or Design Drawings

or not conforming to a Product Specification nominated by the Project Specification or Design

Drawings. Consult the Designer regarding options and instructions for using such products that

are not defective or damaged and appear to be fit for the intended purpose. Obtain written

approval from the Designer to release for use any such products or materials, including any

special requirements and/or limitations on use.

Otherwise reject unspecified or non-conforming products and materials that do not have written

approval for use and arrange for prompt removal from site.

Quarantine any defective products such as those that are damaged, excessively distorted,

outside their “use-by” date, unmarked or incorrectly marked and including, but not l imited to:

(a) Faded/discoloured plastics and/or plastics-coated pipes, fittings and appurtenances.

(b) Kinked or crushed plastics pipes.

(c) PVC pipes and fittings scored deeper than 10% of the wall thickness to a maximum of

1 mm.

(d) PE pipes and fittings scored deeper than 10% of wall thickness.

(e) Electrofusion PE fittings not sealed in separate bags or cartons or with damaged sealed

bags or cartons.

(f) GRP pipes and fittings scored deeper than 1 mm or with impact damage.

(g) DI and steel pipes and fittings with damage to linings in excess of 20% of the lining

thickness.

(h) Plastics-coated pipes, fittings and appurtenances with damage to coating in excess of 20%

of the coating thickness.

Indelibly mark or tag rejected products with wording such as “Do not use” or other identificatio n

and arrange for prompt removal from site.

Not used

12.3 Transportation, Handling and Storage of Products and Materials

12.3.1 General


Transport, handle and store all products and materials in accordance with the manufactur ers’

recommendations and in a manner that prevents damage or deterioration or excessive distortion.

Not used

12.3.2 Transportation Insert new clause as follows:

Support and secure all items during transit using straps or other suitable means to prevent

excessive distortion or movement. Where supports, restraints and packing bear on item surfaces,

provide suitable protection to prevent point loading, chafing, scoring, shock and other damage

during transport. Do not allow wire straps, wire ropes or chains to come into direct contact with

items.

Not used

http://www.hunterwater.com.au/

of 54


Limit the heights of stacks of items to minimise distortion during transport. Where nesting and

stacking of items is permitted, provide appropriate protection measures.

Stack items with end treatments such as flanges or preassembled fittings or couplings on pipes

so that the ends are free from loading and/or damage.

Do not transport plastics items in covered trailers or containers unless appropriate means of

preventing heat entrapment is provided.

12.3.3 Unloading and handling


Personnel involved in unloading and handling should wear appropriate personal protection

equipment.

During unloading and handling pay particular attention to the protection of product and material

coatings and linings and those surfaces that will be in contact with drinking water.

Damage to pipes and fittings during unloading and handling will be prevented by:

(a) ensuring the stability of the pipe stack, proposed unloading equipment and transportation

vehicle;

(b) unloading on even ground;

(c) proper use of unloading equipment;

(d) correct site storage.

Promptly identify and perform in-situ repair of thermal-bonded polymeric coating on fittings and

valves using approved materials in accordance with manufacturer’s recommendations.

Undertake field repairs of coated pipe in accordance with the manufacturer’s recommendations.

Not used

12.3.4 On-site storage Insert new clause as follows:

Except for checking against the purchase order, keep pipes, fittings, valves, seals and other

components delivered within protective crating or packaging, until immediately prior to use. Stack

pipes in a manner that minimises pipe ovalisation.

Where necessary, pipes shall be supported clear of the ground on sandbags, soil mounds, timber

bolsters or similar, at sufficient support spacing to prevent excessive longitudinal bending of pipe

lengths.

While in storage all coated pipes, valves and fittings shall be supported on timber or rubber

contacts not in contact with sharp or hard surfaces that might damage the coating and/or lining.

Stacking of pipes during storage shall be in accordance with the manufacturer’s

recommendations.

Do not store plastics pipe and fittings and plastics coated pipe and fittings near generators or

other heat emitting equipment.

Do not store PVC-U, PVC-M, PVC-O, GRP and non-black (excluding stripes) PE pipes and

fittings uncovered in direct sunlight for more than twelve (12) months. If storage periods are likely

to exceed twelve (12) months, cover and store pipe in a manner that allows ventilation and

prevents heat entrapment. Do not store pipes under dark coloured (e.g. black) plastics sheeting

or in any situation where the temperature may exceed 60C.

Use PVC, GRP and non-black PE pipe and fittings within two (2) years of manufacture.

Limit outside storage of black PE pipe with blue or purple stripes to a maximum of two (2) years

from the date of pipe manufacture as marked on the pipe.

Not used

of 54


Store rubber sealing rings, lip seals and gaskets away from sunlight and in an unstrained

condition.

Maintain the inside of all items clean and dry during storage. Use caps, plugs or blank flanges of

a suitable design to seal open ends of items as necessary to prevent contamination during

storage.

Do not store items such as pipes, fittings, valves and any other product that will contact the

drinking or non-drinking water:

(a) in any gutter or the like; or

(b) in any location where pollution due to rain run-off or any other cause can occur.

12.4 Rejected Products and Materials


Reject any damaged or defective products or materials.

Reject any unauthorised or unspecified products or materials unless written approval has been

given for their use.

Do not use any rejected products or materials in the Works.

Place rejected products and materials in a quarantined area and arrange removal from the site

at the earliest opportunity.

Not used

12.5 Concrete Works 2nd paragraph - delete

Insert new 1st and 2nd paragraphs as follows:

Use premixed, normal class concrete to WSA PS–357 Concrete, Pre-Mixed, Normal Class.

Ensure concrete is delivered to site for use within 90 minutes of commencement of mixing at the

batching plant.

Transport, handle, place and compact concrete so as to:

(a) limit segregation or loss of materials;

(b) limit premature stiffening;

(c) produce a monolithic mass;

(d) completely fill formwork, expel entrapped air, and closely surround all reinforcement,

tendons, ducts, anchorages and embedments; and

(e) provide the necessary surface finishes.

Concrete shall be delivered to site for use within 90 minutes of commencement of mixing at the

plant.

12.6 Supply of Water to the Works


Use non-drinking water for construction works wherever practicable.

Where drawing water from hydrants and fireplugs, for purposes other than fire fighting, obtain a

permit from the relevant Water Agency.

Due to the potential of contamination to the water supply system by backflow, fit a WaterMark

certified testable backflow prevention device or air gap so as to be visible on the tanker (vehicle)

at all times when drawing water from hydrants/fireplugs.

For drawing water from fireplugs and hydrants other than by a water tanker, fit a WaterMark

certified non-testable dual check valve.

The Water Agency shall be consulted to confirm the availability of water supply during the

construction period. Introduction of water supply restrictions over the designated Works area

may prohibit the supply of water to the site. Alternative sources of supply may need to be sought

in the case of restrictions.

Not used

12.7 Supply of Water to Existing Properties


of 54


Maintain supply of water to existing properties affected by the Works to Water Agency

requirements, which may require provision of temporary water supply piping.

12.8 Under Pressure Cut-In Connection to Pressure Pipes ≥DN 80

12.8.1 Flanged off-takes


Supply flanged off-takes to WSA PS−313.

New clause – not included

12.8.2 Valves Insert new clause as follows:

Supply double-flanged gate valves to WSA PS−260.

Supply an extension spindle to WSA PS−262 as required.

Ensure the direction of spindle operation is in accordance with Water Agency requirements.

The direction of closing shall be clockwise.


12.8.3 Flange holes Insert new clause as follows:

Ensure the hole diameter of the bolt holes in flanges requiring insulation sleeves is equal to the

bolt shank diameter plus 5 mm.


12.8.4 Gaskets Insert new clause as follows:

Supply gaskets to WSA PS–312.

Ensure the hole diameter of the bolt holes in gaskets requiring insulation sleeves is equal to the

bolt shank diameter plus 5 mm.


12.8.5 Bolting system

12.8.5.1 General Insert new clause as follows:

Ensure the bolting system can provide mechanical isolation of dissimilar metals by use of

insulation sleeves (with flange) to prevent contact between bolts / washers and flanges of

dissimilar metals. Test for effective insulation using an “insulation resistance” tester in

accordance with Clause 19.6.

Supply sufficient sets of bolt assemblies for the number of holes in the flange being bolted.

NOTE: A bolt assembly includes 1 x bolt, 2 x washers, 1 x nut and 2 x insulation sleeves.

Check that all bolt shanks have a smooth machined finish and are free from protrusions before

fitting the insulation sleeve.

Only use an electrically non-conductive lubricant or anti-seize compound.


12.8.5.2 Carbon or alloy steel bolt assemblies


These assemblies are used for SCL off-takes to valves and other flanged connections. Steel bolt

assemblies may be used in above-ground applications (galvanised) or buried (galvanised or

black).

Only use bolts, nuts and washers that comply with nominated Standards in the Specification

and/or Design Drawings.

For buried applications protect the bolting system from corrosion by wrapping with an approved

petrolatum based protection system.

For SCL pipes, provide insulation sleeves, except in cases where cathodic protection has or is

to be applied, where special insulated joints shall be provided (refer to the relevant Water

Agency).


12.8.5.3 Stainless steel bolt assemblies

Insert new clause as follows: New clause – not included

of 54


Stainless steel bolted connections may be used above or below-ground and do not require

corrosion protection wrapping.

Only use Grade 316 stainless steel bolt assemblies that comply with nominated Standards in the

Specification and/or Design Drawings.

Install insulation sleeves when using stainless steel bolts with any non-coated steel, cast iron or

ductile iron flanges.

12.8.6 Insulation sleeves Insert new clause as follows:

Only use insulation sleeves made from acetal copolymer (POM) M-90 thermoplastic or similar.

Ensure the hole diameter of insulation sleeves is equal to the bolt shank diameter plus 5 mm and

that the outside diameter of insulation sleeve flanges is equal to or greater than outside diameter

of washers.


12.8.7 Plastics inserts for metallic pipes


Ensure the plastics insert used to prevent tuberculation in the cut hole is designed to remain

secure under maximum flow conditions through the hole and to not project unduly into the flow

path of the host pipe. Only use plastics inserts that comply with AS/NZS 4020.


13 Excavation

13.1 Precautions Insert new clause as follows:

Assess site for prior excavations and consider their impact on the new excavation.

Conduct a site hazard and safety assessment prior to commencement of any excavation to

identify all potential hazards in accordance with Clause 11.5.1.

Comply with recommendations and guidelines set out in the Code of Practice: Excavation 2000

issued by the WorkCover Authority of NSW (copies available at

www.workcover.nsw.gov.au/pdf/cop_excavation.pdf).


Delete Clause 13.2 Existing Services

Delete Clause HW 13.1.1 Location of services

Delete Clause HW 13.1.2 Protection and maintenance of services

Delete Clause HW 13.1.3 Repair of services

Delete Clause HW 13.1.4 Disused water mains

13.2 EXISTING SERVICES

HW 13.1.1 Location of services

Details of services shown on the Design Drawings are not to be taken as indicating all existing

services or exact locations. Verify the exact location of all services which may be affected by

construction activities. Give notice at least three working days prior to commencement of any

construction activity that may affect a service.

HW 13.1.2 Protection and maintenance of services

Protect and maintain existing services to the satisfaction of the Owner including, if necessary,

relocation, temporary diversion or support of the service.

HW 13.1.3 Repair of services

If a service is damaged during execution of the work, arrange or perform repair to the satisfaction

of the Owner. Obtain from the Owner a certificate stating that the repair has been carried out to

their satisfaction.

If the service is not under the control of an authority and the Owner cannot be located within a

reasonable time, report the damage, and arrange or perform repair to an approved standard. Do

not backfill, cover up or make the repair inaccessible prior to obtaining approval.

http://www.workcover.nsw.gov.au/pdf/cop_excavation.pdf

of 54


HW 13.1.4 Disused water mains

Unless noted otherwise on the Design Drawings, cap all disused pipelines at each end to prevent

ingress of seepage water. Remove and dispose of all redundant surface fittings and marker

plates.

Do not commence any excavation until all equipment and materials necessary to make the

excavation safe are on site and available for use. This includes any necessary fencing and

barriers, as well as trench support systems.

Assess site for prior excavations and consider their impact on the new excavation.

Conduct a site hazard and safety assessment prior to commencement of any excavation to

identify all potential hazards.

13.2 Limits of Clearing and Excavation

1st paragraph – insert “as Specified” after “Works

1st paragraph – delete 2nd sentence

2nd paragraph – delete

3rd paragraph - delete

5th paragraph - delete

HW clause titled 13.2 Limits of Excavation

Keep the extent of clearing and excavation to the minimum practicable to allow efficient

construction of the Works. Obtain the approval of the Council for the removal of any trees.

Prevent damage to trees that are not to be removed.

Dispose of all rubbish and surplus material within 24 hours of clearing.

Stockpile topsoil separate from other excavated material and use the topsoil to make good the

surface after backfilling.

Unless specified otherwise, keep the sides of excavations vertical to at least 150 mm above the

main.

Ensure that the minimum cover requirements will be satisfied following any earthworks that may

occur in the area of the water main. This is particularly relevant in new subdivisions or

developments where earthworks are expected to form roads, driveways, footways and for general

shaping of the surfaces. Concrete encase pipework if minimum cover requirements cannot be

achieved or propose an alternative.

13.3 Protection of Trees

13.3.1 General precautions


Obtain approval from the Owner of the trees prior to excavation.

Avoid storing products and materials, including soil, rocks or gravel against trees or under tree

canopies or above root zones.

Fence off trees to keep machinery away. Tie back stems and branches to keep them out of the

path of machinery. Boring or hand excavation may be acceptable alternatives.

Carefully clean machinery between jobs to minimise the risk of soil-borne contamination between

work sites. This is mandatory in areas where cinnamon fungus occurs.


13.3.2 Protection of roots 1st paragraph – 1st sentence - insert “Take every precaution to” at beginning of sentence

1st paragraph – 1st sentence - insert “as a result of excavation for the Works” after “system”

1st paragraph – insert new 2nd sentence “Excavation for water main construction by hand or by

trenchless techniques may be required to protect the root zone.

3rd paragraph – delete

Insert new 3rd, 4th and 5th paragraphs as follows:

Do not cut tree roots larger than 60 mm diameter without authorisation of the Superintendent.

Immediately trim back damaged roots or branches, including damage to bark, with a sharp saw

to achieve a clean cut .

HW clause titled 13.4 Excavation in root zones

Ensure that no undue damage is caused to a tree root system.

Cleanly cut all roots 60 mm diameter encountered during excavation.

Tunnel or bore to avoid tree roots larger than 60 mm diameter.

of 54


Apply an approved fungicide or mastic tar to reduce the likelihood of infection as nominated in

the Specification and/or environmental management plan.

13.4 Blasting Delete existing clause


Do not use blasting unless authorised by the Water Agency.

Obtain prior authorisation from the Superintendent, relevant Regulator and affected Owners of

assets within the vicinity before undertaking blasting.

Submit a blasting plan that includes management of the blasting and means to be used to satisfy

the requirements of AS 2187 and the authorising parties.

Use alternative methods of excavation to blasting wherever achievable.

Obtain prior authorisation from the relevant Regulator and Owners of assets within the vicinity.

Submit a blasting plan that includes management of the blasting and means to be used to satisfy

the requirements of AS 2187 and the authorising parties.

13.5 Support of Excavations

3rd paragraph – delete “prevent slips or falls”

Insert new 1st paragraph as follows:

Support all excavations in accordance with:

(a) the Specification and/or Design Drawings;

(b) the applicable OH&S Act;

(c) any applicable Code of Practice for Safety Precautions in Excavation/Trenching

Operations; and

(d) any risk control measures described in the Safety Assurance Plan and/or Job Safety

Analysis (Refer to Appendix J).

Support all trenches of depth 1.5 m or greater or in unstable ground strata.

Ensure that adjacent structures and services are not subject to disturbance by the trench support

system.

When removing, raising or withdrawing supports, prevent slips or falls and ensure that no

damage, disturbance or displacement occurs to the pipes, fittings, geotextile filter fabric, pipe

embedment and trench fill already installed. Ensure that compaction of pipe embedment and

trench fill material occurs below such trench support and against native ground.

If the trench system is to be left in place as permanent support, cut off the support system at a

depth below ground surface that will satisfy the structural and development requirements of the

site.

13.6 Drainage and Dewatering

No change

Keep all excavations free of water. Provide, maintain and operate intercepting Works to prevent

surface water from entering the excavations. Provide all equipment necessary for dewatering the

excavations and keeping the Works free from water.

Only lower the water table by well points or other external dewatering methods if no damage is

likely to be caused to adjacent structures and services or the environment.

Ensure that all downstream Works that are under construction, completed or in use are protected

at all times against the effects of any drainage that is discharged or likely to be discharged from

the Works.

Do not discharge dewatering to sewers, storm water drains or watercourses without appropriate

authorisation and without complying with the Owner's or Regulator’s requirements.

13.7 Under Pressure Cut-In Connection to Pressure Pipes ≥DN 80

13.7.1 Excavation requirements


Expose the host pipe for a sufficient length to ensure the required distance from pipe joints and

fittings will be achieved. Expose adjacent services and other obstructions to ensure sufficient

clearances will be available to apply the UPCIC method and for the associated pipework to be

installed.

Excavate to a minimum of 100 mm below and behind the pipe to allow for installation of the off -

take clamp. Provide additional excavation, as required, for placement of thrust blocks.

Excavate a safe working area, on the side to which the connection is to be made, to suite the

space requirements for installation of the under pressure cut-in connection (Refer to Figure 13.1

for typical dimensions).

Support the host pipe during excavation and drilling.

Other services may remain in the excavated region provided that they are not on the same

elevation as the host pipe and sufficient clearances will be achieved .


of 54


13.7.2 Extent of excavation


Keep the extent of excavation to the minimum possible to allow efficient connection to the pipe.

Provide sufficient space to safely and correctly cut-in the host pipe, to ensure that no other

services are damaged in the process and that required spacings and clearances are achieved.

Unless specified otherwise, keep the sides of excavations vertical to at least 150 mm above the

pipe.

Ensure that the minimum cover requirements shown on relevant Design Drawings are satisfied

following any earthworks that may occur in the area of the pipe, particularly in new subdivisions

or developments where earthworks are expected to form roads, driveways, footways and for

general shaping of the surfaces. If minimum cover requirements cannot be achieved, submit a

proposal to the Superintendent to overcome the problem.

FIGURE 13.1 TYPICAL EXCAVATION DIMENSIONS


of 54


13.8 Excavation Across Improved Surfaces

1st paragraph – insert “land” before “Owner”


3rd paragraph – delete “If open” and insert “For open”; delete “are necessary”; insert last sentence

“Ensure trench fill is compacted to requirements of Clause 17.1.3.”

Insert new 2nd paragraph as follows:

Adopt the most appropriate method of construction to minimise restoration of improved surfaces

such as pavements, driveways, kerbs and gutters and where the surfaces cannot be satisfactorily

reinstated, use tunnelling or boring in accordance with Clause 15.15 and as approved by the

Superintendent..

Obtain written permission of the Owner prior to commencing any excavation across improved

surfaces.

If pipework is to cross improved surfaces such as pavements, driveways, kerbs and gutters, use

tunnelling or boring if practicable.

If open excavations across improved surfaces are necessary, keep the trench width to the

minimum allowed. Saw cut neat straight lines at least 150 mm beyond the outer limits of the

excavation through bitumen, asphalt and concrete. Remove pavers, blocks or brick pavements

by hand, clean them and set them aside for later replacement.

13.9 Trench Excavation


Ensure that the minimum cover requirements shown on relevant Design Drawings are satisfied

following any earthworks that may occur in the area of the water main.

From commencement of excavation, trenches shall be maintained in a stable condition to preven t

movement or collapse. The length of trench open at any one time shall be minimised.

Ensure the trench centreline aligns with the design centreline of the pipeline within the specified

tolerances.

Excavate to at least the minimum width shown on the Design Drawing(s) but not greater than

that required for the ground support system. Where the minimum width is exceeded by more than

500 mm, have the structural condition of the pipeline assessed by the Superintendent.

Routinely monitor soil types and soil condition. Notify the relevant person (e.g. Superintendent,

Designer, Geotechnical Specialist) of any occurrence of significant difference from the predicted

soil type or conditions. Do not proceed with pipeline installation at the locations of interest until

the structural design has been re-evaluated and confirmed or modified.

With the exception of where a special base is required, excavate below the invert of the pipe to

at least the depth shown on the Design Drawing(s) but not more than 50 mm below that depth.

If the excavation protrudes outside of the easement, backfill and compact the trench in

accordance with the Water Agency’s and Owner’s requirements, otherwise arrange for the

easement to be widened.


13.9.2 Construction of embankment


Where compaction of the embedment material in an embankment to the required density will not

be possible owing to the absence of side containment, first construct the embankment to top of

the pipe embedment zone and then cut a trench for installation of the pipeline.


13.9.3 Clearances for on-site works


Where personnel will require access for welding or application of corrosion protection, provide

clear space, measuring at least 500 mm in all directions from the workface.


13.10 Refill of Excessive Excavation


Where the excavation depth and width exceed those specified in Section 21, arrange for the

Superintendent to assess the structural requirements of the pipe and provide direction on refilling

the excessive excavation with one of the following:

In foundation and embedment zones:

(a) In wet sandy conditions, 20 mm single size coarse aggregate; and


of 54


(b) Elsewhere:

(i) 20 mm Class ‘2’ crushed rock, or;

(ii) 3% cement stabilised 20 mm Class ‘2’ crushed rock, or;

(iii) N20 Grade concrete, formed or screeded to an even and uniform finish

In trench fill (backfill) zones:

(A) Under road pavements, 20 mm Class ‘2’ crushed rock; and

(B) elsewhere:

Embedment concrete sand; or

Selected excavated material containing no rock fragments larger than 20 mm

or hard clay fragments larger than 40 mm.

Place and compact all refill (apart from concrete) to the relative compac tion value specified for

embedment material in trafficable or non-trafficable areas, as applicable, as given in Table 19.1.

13.11 Foundations and Foundation Stabilisation



The bottom of the excavated trench is required to provide a foundation suitable for the adopted

construction method.

Prior to placing embedment, check the proposed foundation using the method described in

Appendix G – Soil Classification Guidelines and Allowable Bearing Pressure for Anchors and

Thrust Blocks as a guide. Where the bottom of an excavation is unable to provide a firm

foundation with minimum bearing capacity of 50 kPa at the required level (tolerance +0, -50 mm)

without abrupt irregularities or undulations, obtain written instruction from the Superintendent on

the means for providing a satisfactory foundation (refer to Drawing WAT-1200).

Prior to placing embedment, check the proposed foundation using Standard Drawing WAT–1200

as a guide.

Seek direction if the Field Identification Test indicates a bearing capacity of less than 50 kPa at

the required level. Carry out the Field Identification Test in the presence of the Superintendent.

13.12 Surplus Excavated Material



Surplus material is the property of the owner of the excavation site.

Where the spoil from trench excavation is to be used for trench fill, isolate the topsoil for later

use in restoration.

Promptly remove and dispose of excavated material that is not required for reuse. Dispose of

lawfully and in accordance with project requirements.

Promptly remove and dispose of excavated material that is not required for reuse.

13.13 Tunnelling Insert new clause as follows:

Excavation using tunnelling techniques differs significantly from typical open trench excavations

due to the difficulty of determining accurate geological properties and the potential variability of

these properties along the tunnel route.

Tunnel design is based on less reliable material property assumptions than typical trenching

operations.

Before submitting a tunnelling proposal for approval to the Superintendent engage an

appropriately qualified design consultant to:

(a) review existing geological information;

(b) undertake a site investigation to confirm the existing information and as necessary obtain

more specific local geological information; and


of 54


(c) prepare Design Drawings and a tunnelling specification which, inter alia, should specify

the geological conditions assumed in the design, including relevant issues.

Upon approval of a tunnelling installation:

(i) implement an inspection plan to compare the actual geological conditions as the

excavation progresses with the assumed conditions; and

(ii) implement procedures to assess the implications of any changes in conditions and

reassess the adequacy of the tunnel design and ground support before the changes

become a risk to health and safety. This may include ceasing relevant work while

the reassessment is being conducted.

14 Bedding for Pipes

14.1 Trench Floor Preparation


Inspect the trench floor for rock outcrops and soft and loose areas. Take appropriate action to

ensure the pipe or fitting or valve or other appurtenance or structure will not be subject to

differential settlement in the future.

Where rock outcrops are present, trim the trench floor and fill with granular material to restore

the design trench floor level limits. Treat soft and loose areas as specified in Clause 13.11.

Compact all fill and all disturbed areas to not less than the density of the natural ground.

Remove all debris and water before bedding is placed.

Not used

14.2 Bedding and Pipe Support


Pipe bedding is the zone between the ground foundation and the bottom of the pipe. In most

cases, material specified for pipe embedment is used for bedding.

Provide bedding of the type as specified.

Where the water main is supported on concrete, do not place bedding material until the concrete

has obtained its initial set.

If alteration of the bedding design as specified is required to suit the actual ground conditions on

site, obtain the Superintendent’s written approval.

Place and rake-in the bedding to the required depth.

Compact the bedding material to the relative compaction as specified for the embedment material

in Table 19.1.

Grade the compacted bedding material surface to the specified tolerances to ensure the bedding

material surface is smooth and the pipeline is offered continuous support.

Do not walk on the centreline of the compacted bedding.

Where specified, envelope the embedment material with geotextile filter fabric.

Refer to Drawings WAT-1201-V, WAT-1202, WAT-1250-H and WAT-1251-H.


Delete Clause 14.2 Bedding Materials including Table HW 14.1 14.2 Bedding Materials

Use embedment materials that comply with the maximum particle sizes in Table HW 14.1.

of 54


Delete Clause 14.3 Placement of Bedding 14.3 Placement of Bedding

Place and rake-in the bedding to support the pipe uniformly along the whole length of the barrel

with chases provided for sockets, couplings and other appurtenances. Do not compact the

bedding.

Do not walk on the centre of the bedding either during or after placement.

14.3 Special Pipe Support for Non-Supportive Soils


Construct piered or other special support as specified.

Refer to Drawings WAT-1203 and WAT-1204-V.


15 Pipe Laying, Jointing and Connecting

15.1 Installation of Pipes

15.1.1 General



After preparing pipe bedding, lay and joint pipes in locations and sizes as specified. Use

methods, materials, tools and equipment in accordance with manufacturer's and/or supplier’s

instructions and recommendations, relevant Standards and requirements of this Part. Adhere to

any limitations imposed by the Water Agency’s OH&S and/or environmental requirements.

Maintain the inside of all items clean and dry during the construction of the water main. Use

exclusion caps, plugs or blank flanges of a suitable design to seal open ends of items as

necessary to prevent contamination during pipe laying operations.

If at any time pipes become flooded internally with dirty water during storage and/or construction,

remove any dirt and foreign matter from within the pipeline.

Store and handle pipeline system items that will contact the dr inking water, such as pipes and

valves, to protect from run-off or other contaminants. Clean and disinfect any items that have

become flooded or otherwise polluted or replace with new items.

Use exclusion caps, plugs or blank flanges of a suitable design to seal open ends of items as

necessary to prevent contamination during pipe laying operations.

15.1.2 Dual water supply areas


Before commencing laying and jointing of mains in dual water reticulation areas, the constructor

must submit an Inspection and Test Plan (ITP) for Water Agency approval.

The ITP shall:

(a) address any regulatory requirements; and

(b) nominate hold and witness points during the installation, testing and commissioning of non-

drinking water mains, including non-drinking water property services and specifically

provide installation procedures to minimise the likelihood of cross-connections and a

system integrity inspection to identify cross-connections.

This system integrity inspection is conducted as part of the commissioning of the non-drinking

water supply system. The system integrity inspection is designed to eliminate the potential for

cross contamination caused when a drinking water service is connected to a non -drinking water

main.


of 54


A commissioning process for the drinking and non-drinking water services is provided in

Appendix K – Connectivity Inspection of Dual Water Supply Systems.

15.1.3 Cleaning, inspection and joint preparation


Clean and examine all pipeline system items before installation. Inspect each joint seal for fit

and flaws before making the joint in accordance with the manufacturer’s instructions. Do not use

damaged, dirty or incorrect seals. Ensure that the correct joint lubricant is used for rubber seals.

Inspect all items just prior to use in accordance with Clause 12.2. Remove damaged items from

the Works site and replace.

Chamfer, if required, and provide witness marks on the unmarked length of any cut p ipes. Do

not score pipes when providing the witness mark.

Treat cut pipe ends in accordance with pipe manufacturer’s recommendation.

Clean and examine all pipeline system items before installation.

Delete Clause 15.1.3 Polyethylene 15.1.3 Polyethylene

Weld PE pipe system components in accordance with WSA 01.

15.1.4 Laying Delete existing clause


Firmly and evenly embed the barrels on the graded and compacted bedding material.

Excavate pockets for sockets, couplings, flanges or other projections so as to ensure the pipeline

is fully supported along the full length of pipe barrels. Ensure such pockets are the minimum

necessary to keep the projection clear of the bedding material, except where access for joint

treatment requires additional excavation.

To prevent movement, restrain pipes already laid before the next joint is made.

Prevent flotation of pipes during laying in accordance with Clause 15.6.

Lay all pipes with their identification markings facing upwards.

Lay the water main on continuously rising grades from scour valve to local high point,

notwithstanding any minor irregularities in the ground surface. Make gradual changes in

alignment or grade by deflecting at flexible joints after the joints have been made. Comply with

the manufacturer’s recommendations in respect of maximum deflection for each joint.

When joining pipes:

(a) Ensure that the inside of the socket is clean.

(b) Where elastomeric seals are required to be fitted, clean and fit the seal if not already fitted.

Check that the elastomeric seal sits evenly in the housing.

(c) Apply the manufacturer’s specified lubricant to the end of the spigot and chamfer of the

pipe spigot.

(d) Align the pipes so that there is no deflection at the joints before inserting the spigot in the

socket and pushing it home to the witness mark.

(e) Hold the socket end firmly during jointing to prevent previously assembled joints from

moving.

(f) Do not insert a metal spigot (e.g. of a fitting) into the socket of a plastics pipe.

Where pipes are required to be cut in the field:

(i) Cut the spigot end square and remove all burrs.

Firmly and evenly embed the barrels on the bedding material. Form chases in the bedding to

accommodate the pipe sockets and/or couplings to allow even bearing along the full length of

the pipe barrel.

Lay the water main on continuously rising grades from scour valve to local high point,

notwithstanding any minor irregularities in the ground surface.

When jointing plastic pipes such as PVC and GRP to ductile iron and steel pipe and fittings, do

not join a metal spigot to a plastic socket.

At the end of each day's laying, seal the end of the pipe to prevent ingress of vermin, trench

material, water and other foreign material.

of 54


(ii) Chamfer the cut end of the pipe with a taper of approximately 15 to approximately

half the wall thickness, or as otherwise specified by the pipe manufacturer.

(iii) Witness mark the pipe at the distance specified by the manufacturer and make the

joint as specified in (a) to (f).

If the same manufacturer does not make spigots and sockets, refer to the socket

manufacturer for the correct witness marking depth.

(g) If an elastomeric seal joint is located at the end of a length of restrained pipes (e.g. welded,

flanged, locked joints) install anchorage/thrust restraint as specified.

If the air temperature is hotter or colder than the ground temperature, pipes will contract or

expand when buried. Laying and joining pipes at the cooler time of the day may reduce stressing

of the pipeline.

After laying each pipe, temporarily seal the exposed end using an exclusion cap or approved

equivalent to prevent ingress of excavation debris, vermin, trench material, water and other

foreign material.

Refer to Drawings WAT-1102-V, WAT-1103, WAT-1104-V, WAT-1201-V and WAT-1405.

15.1.5 Life and re-lay construction


If lift and re-lay construction is specified:

(a) Where specified by the Water Agency, supply affected properties with a temporary water

service. The temporary supply to each property shall incorporate a ball valve so the

property can be isolated without disrupting water supply to other properties supplied from

this temporary water supply;

(b) Swab mains in accordance with Clause 18; and

(c) Check each individual service for water availability prior to vacating the site each day.


15.2 Horizontal and Vertical Deflections of Pipes

15.2.1 General


Minor deflections of a pipeline may be achieved by cumulative deflections at the joint of

elastomeric ring seal jointed pipes. Flexible pipes (e.g. PE and PVC) may be deflected by

controlled bending along the length of the pipe. Limits of deflection are specified by the pipe

manufacturer.

Removal of temporary pegs or stakes is essential to avoid point loading of the pipes. Non -

removal may result in pipe failures.

Not used

15.2.2 Deflection at a pipe joint


Make the pipeline joint in a straight line before deflecting the joint. Do not exceed the pipe

manufacturer's specified maximum deflection. The introduction of new designs of joints for

plastics pipes has reduced the deflection in the joints from 3 to 1 or less (refer to Drawings

WAT-1250-H and WAT-1251-H).

Not used

15.2.3 Curving of pipe Delete existing clause


Where permitted by the Specification, cold bend the pipe with a uniform radius along the length

of the pipe in accordance with the pipe manufacturer’s instructions. Do not exceed the minimum

bend radius specified on the Design Drawings or in the Specification. Join the pipes directly in

line before making the curve. Do not use temporary pegs or stakes to restrain t he pipe during

curving.

HW clause titled Bending pipe

Do not cold bend any pipe other than PE. Bending of PVC pipe is not permitted.

Cold bend the pipe with a uniform radius along the length of the pipe in accordance with the pipe

manufacturer's instructions. Do not exceed the pipe manufacturer's specified minimum bend

radius.

Do not use temporary pegs or stakes to bend the pipe.

of 54


15.3 Horizontal and Vertical Separation of Crossing Pipelines


Maintain minimum vertical separation of crossing pipelines as specified. Fill the separation with

embedment material and compact.

Ensure pipelines cross as close to 90º as practicable, but not less than 45º.

Not used

15.4 Valves, Hydrants and Other Appurtenances


Install valves, hydrants and other appurtenances so that access to each item for maintenance

and repair purposes is not restricted. This requirement particularly applies to installation of dual

water reticulation in shared trenching.


15.5 Under Pressure Cut-in Connection to Pressure Pipes ≥DN 80

15.5.1 Inspection of host pipe


Remove sufficient corrosion protection material to allow the installation of the off -take fitting.

Clean the pipe and inspect for corrosion, pitting, scoring and/or any other surface damage.

Notify the Superintendent if the pipe is badly corroded or damaged for a decision on whether to

proceed.


15.5.2 Inspection of valve to be installed


Inspect the valve to be installed to confirm that the obdurator (wedge) can be fully withdrawn into

the bonnet so that it will not be damaged during the cut-in operation.


15.5.3 Disinfection of fittings and equipment


Do not use equipment that has been used in sewer applications without washing to remove all

surface deposits with a pressurised washing system using clean water and a biodegradable

detergent.

Disinfect all connection fittings and equipment prior to installation / use by either of the following

methods:

(a) Spray or flood all surfaces with a solution of sodium hypochlorite of concentration not less

than 1%; or

NOTE: This solution may be corrosive to some components.

(b) Spray or flood all surfaces with an 80/20 alcohol (ethanol)/ water solution.

Allow contact time for each of these solutions of at least 1 minute. Use appropriate safety

equipment.


15.5.4 Installation of off-take clamp


Install off-take clamp as follows:

(a) Check the flanged off-take clamp for damage and ensure that it is the correct size to suit

the host pipe and the off-take valve.

(b) Check the host pipe locally for surface irregularities (e.g. deep pitting, scoring, weld repairs

etc) to ensure the sealing system used on the flanged off-take clamp can successfully seal

against the pipe.

(c) Install the flanged off-take clamp and tension the bolts in accordance with WSA 109.

(d) After the flanged off-take has been fitted to the host pipe, reinstate, as appropriate, the

external host pipe corrosion protection coating to the satisfaction of the relevant Water

Agency.


of 54


This activity may need to be deferred to after pressure testing – See Clauses 15.5.6 and

19.4.4.

(e) Weld steel flanged off-take clamp to the host steel pipe in accordance with AS/NZS 1554.1,

category SP. Conduct all welding by welder(s) certified for the welding processes and

materials as appropriate. As appropriate, profile cut flanged off -take on-site to suit the pipe.

Use fillet welds of 5 mm minimum leg length. Do not weld to DICL or CICL pipes.

(f) After the steel flanged off-take has been welded to the host pipe, reinstate the external

coatings to the satisfaction of the relevant Water Agency.

Where thrust restraint is required for the host pipe, install thrust blocks in 2 sections so that

support is provided to the host pipe on both sides of and without interfering with the flanged off -

take clamp.

15.5.5 Installation of the valve


Install valves in the vertical position, unless authorised by the Superintendent.

Install and test the valve as follows:

(a) Inspect the valve for damage. Repair any damage to the external coating as directed by

the Water Agency. Reject valves with damage to the coating of the waterway.

(b) Check the valve and off-take clamp flanges to ensure the sleeves fit in the bolt holes. Trim

insulation sleeves such that they join inside one flange, and not at the flange joint.

(c) Exercise the valve and verify the correct spindle operating direction.

(d) Disinfect the valve and clamp (Refer to Clause 15.5.3).

(e) Bolt the valve to the flanged off-take clamp using an authorised gasket and bolting system.

(f) Tighten bolts in accordance with WSA 109.

(g) Support (using concrete blocks or other approved support) the valve and the flanged off -

take and secure to ensure no mechanical load is transferred to the flanged off -take clamp

or host pipe.

(h) Test degree and integrity of the electrical resistance of the bolted joints (Refer to

Clause 19.6).

All supports shall be installed in accordance with the requirements of the relevant Water Agency.


15.5.6 Cut-in operation Insert new clause as follows:

Cut-in (drill) the host pipe as follows:

(a) Prior to commencing the cut-in (drilling) operation fit the appropriate hole saw (cutter) and

pilot drill for the pipe material to the under pressure cut-in connection machine.

(b) Lower the under pressure cut-in connection equipment safely into the excavation and

assemble onto the valve.

(c) Pressure test the off-take clamp assembly on the host pipe in accordance with

Clause 19.4.4.

(d) After satisfactory pressure testing, proceed with the under pressure cut -in connection

operation until the pipe coupon (removed section) actually separates from the pipe thus

ensuring that is retained by the cutter.

(e) When the hole has been drilled remove / drain the swarf out of the machine.


of 54


(f) For holes 80–150 mm in metal pipes, position a plastics insert in the host pipe to isolate

the exposed metal surface created during the cut-in process so as to limit tuberculation

(corrosion nodules which grow and restrict the flow).

(g) Close the valve.

(h) Once the under-pressure cut-in connection equipment has been removed, check the

assembly for visible leaks.

15.5.7 Recording and reporting


The Operator shall record and report all relevant aspects of the under pressure cut -in connection

operation including, but not limited to, recording the pipe’s pressure, depth, condition of the

coating, condition of the lining and the condition of the pipe.

The removed coupon shall be logged and filed or given to the Superintendent depending on

relevant Water Agency requirements.


15.6 Flotation Control Delete existing clause


Prevent flotation of pipes by:

(a) Using concrete bulkheads or trench stops in accordance with Design Drawing(s); and/or

(b) Placing and compacting sufficient height of fill material; and/or

(c) Filling the pipeline with water, where authorised; and/or

(d) Other appropriate method authorised by the Superintendent.

Where trench dewatering is necessary, fully place and compact embedment and fill material in

accordance with Sections 16 and 17 while dewatering systems are operating.

Refer to Drawing WAT-1209.

Prevent floatation of pipes by:

(a) Using trench stops; and/or

(b) Placing and compacting sufficient height of fill material; and/or

(c) If authorised filling the pipeline with water.

Where trench dewatering is necessary, fully place and compact embedment and fill material

while dewatering systems are operating.

15.7 Thrust and Anchor Blocks and Restrained Joints



Construct thrust or anchor blocks at valves, flexibly jointed bends, tees, enlargers, ends of PE

pipelines and reducers of the type and size indicated in the relevant Design Drawings.

Position thrust and anchor blocks to bear against undisturbed material in the direction of the

thrust and over the specified bearing area and to allow for movement at the joint, caused by

pressure surges, ground movement etc. Do not encase any part of joints.

Place an approved membrane (e.g. PE or PVC or felt) between the fitting and the concrete to

prevent damage to the coating of the fitting. Ensure that thrust and anchor blocks are properly

formed up before concrete is poured.

Since thrust acts through the centre of the fitting, construct thrust and anchor blocks equally

about the centre of the fitting. It is important to note that it is the bearing area that is critical and

NOT the weight or volume of concrete used in the thrust block.

Ensure that anchorage does not interfere with other services.

Where poor bearing capacity of the soil and/or the possibility of the area being disturbed in the

future is encountered, refer to the Superintendent for alternative methods of providing thrust

restraint. Restrained joint arrangements may be employed. Restrained joint systems include

welded joints, flanged pipes and fittings and commercial mechanical restrained joint systems.

Construct thrust or anchor blocks at valves, flexibly jointed bends, tees, enlargers and reducers

of the type and size indicated in the relevant Design Drawings. Where the Design Drawings

specify that a Field Identification Test must be carried out to WAT−1200, carry out the testing in

the presence of the Superintendent.

Position thrust and anchor blocks to bear against undisturbed material in the d irection of the

thrust and over the specified bearing area.

Allow seven days from placement of concrete before applying any thrust load.

Ensure that anchorage does not interfere with other services.

of 54


Where restrained joints are specified for ductile iron pipelines, obtain written installation

procedures from the manufacturer before installation. Adhere to the manufacturer’s installation

procedures.

Another aspect that needs to be considered is the degree of angle change on thrust area. Thrust

area for a 45 bend is half that of a 90 bend. In some instances it may be advantageous to use

two 45 bends rather than a 90 bend.

It is the Designer’s responsibility to nominate the allowable bearing pressure of the ground and

nominate the design pressure of the pipeline. Where the Constructor has concerns about the

ground conditions differing from the design assumptions, refer to the Designer for determination

of an appropriate solution.

When using a restrained joint system for the first time, arrange on-site installation instruction

from the manufacturer/supplier.

Refer to Drawings WAT-1205-V, WAT-1207-V, WAT-1208 and WAT-1802.

15.8 Tapping of Mains, Property Services and Water Meters



Permission to lay pipes across a street or public place may need to be obtained from the local

planning authority, generally the local council, before commencing construction.

In some jurisdictions, the installation of property services and water mains may be required to

be carried out by, or under the supervision of, a licensed plumber, in which case the work should

comply with Plumbing Standards (AS/NZS 3500.1), as well as the requirements of this Code and

the Water Agency requirements. Otherwise, install in accordance with the Design Drawings,

Specification and any specific Water Agency requirements.

Dry connections (drillings/tappings) are not normally provided in industrial or commercial

development as the location and size of property services can only be determined at the time of

application to connect in conjunction with building development and the type of planned business

undertaking (refer to Drawing WAT-1109-V).

At the time of construction of drinking and non-drinking water reticulation mains within residential

areas, install pre-tapped connectors and property services with or without a water meter as

indicated in the Specification and/or Design Drawings.

Where tapping is specified for PVC, GRP and DI mains use an authorised tapping band

complying with WSA PS–310.

Where tapping is specified for PE mains use an authorised electrofusion tapping saddle


Where the use of electrofusion tapping saddles at nominated locations on a PE main is

determined impracticable by the Project Manager, use an authorised mechanical tapping saddle


In all instances where tapping is employed:

(a) tap with the main dry before completing embedment and placement of trench fill and

hydrostatic pressure testing;

(b) tap curved mains, where curving of pipe is permitted (e.g. PE) at the crown of the pipe;

(c) maintain a minimum spacing of 500 mm between tappings, and from a tapping and the end

of a pipe; and

HW clause titled 15.6 Property Services and Water Meters

Embed, trench fill and compact as specified for the reticulation main.

Where property services are not at 905° to the main, lay marking tape on top of the property

service.

Verify with the pipe manufacturer that tapping bands are suitable for the pipeline being tapped

and that the tapping bands comply with WSAA Standard WSA 107 Issue 3.

of 54


(d) remove all swarf before making the connection.

In addition to (a), (b), (c) and (d), for PE mains:

(i) where electrofusion tapping saddles are used allow the assembly to cool naturally in

accordance with the manufacturer’s instructions before tapping;

(ii) where under pressure tapping is performed, use tapping equipment that employs a

plug cutter that can retain the PE pipe wall plug within the cutter; and

(iii) where dry tapping is performed, use a plug cutter.

Tapping at the side of a straight pipe section of main is permitted.

Lay all property services crossing road carriageways within a duct, with the drinking water and

non-drinking water service pipes being housed in the same duct. Install duct location markers as

required.

Ensure tolerances for position and level are within limits specified in Section 21.

Record and advise the location of all service connections, property services and ducts to the

Designer for recording on the Work As Constructed plan.

Install appropriately sized ball valves on property services at predetermined locations on mains

as they are being laid.

Embed, trench fill and compact as specified for the reticulation main (Refer to Sections 16 and

17). Lay marking tape on top of all new property services (Refer to Clause 15.12).

Do not undertake dry tappings in industrial and commercial developments. Optional service

conduits for future services may be installed at the time of construction.

15.9 Trench Stops Insert new clause as follows:

Construct trench stops with trench drainage as specified.

Refer to Drawings WAT-1209 and WAT-1210.

Not used

15.10 Bulkheads Insert new clause as follows:

Construct concrete bulkheads with trench drainage as specified. Do not construct a bulkhead

directly beneath a kerb.

Refer to Drawings WAT-1209 and WAT-1210.

Not used

15.11 Corrosion Protection of Ductile Iron

1st paragraph - delete “cast iron” and insert “ductile iron”

2nd paragraph - delete

HW clause titled Corrosion Protection of Cast Iron

Sleeve bitumen coated buried cast iron items with polyethylene, fixed with PVC tape complying

with AS 3680. Install sleeving to AS 3681. Do not allow sleeved items to be exposed to sunlight

for more than seven (7) days.

Cast iron includes grey cast iron and ductile (cast) iron.

15.12 Marking Tapes


Lay marking tape for mains and property services in accordance with the Design Drawings. Fix

and join marking tapes in accordance with the Design Drawings and/or Specification.


15.12.1 Non-detectable marking tape


Lay non-detectable marking tape on top of the pipe embedment material before trench filling.

Not used

15.12.2 Detectable marking tape



For all non-metallic pipes, including property services lay detectable marking to form a

continuous connection between valves and/or hydrants. Strip the ends of the tape to expose its

of 54


When detectable tape is specified, lay tape on top of the pipe embedment. Lay the tape over the

embedment to form a continuous connection between valves and/or hydrants. Strip the ends of

the tape to expose its conducting wires. Connect bare wires to a nut o r bolt of a valve or hydrant

to form an electrical connection of the wire to the valve or hydrant.

conducting wires. Connect bare wires to a nut or bolt of a valve or hydrant to form an electrical

connection of the wire to the valve or hydrant.

15.12.3 Tracer wire Insert new clause as follows:

Where pipes have been installed using trenchless techniques, detectable or non-detectable

marking tape is not suitable as it is likely to tear during installation .

Where trenchless installation is used, install a 2 mm diameter Grade 316 stainless steel tracer

wire with the pipe and attach each end of the tracer wire to a valve or hydrant as per Clause

15.12.2.


15.13 Valves, Hydrants and Surface Boxes and Fittings

15.13.1 Installation



Install valves, hydrants and surface boxes and fittings, including covers and surrounds, of the

type, size and locations shown in the Design Drawings (refer to Drawings

WAT-1104-V, WAT-1105-V, WAT-1207-V, WAT-1301-V, WAT-1302-V, WAT-1303/04-V and

WAT-1305/06-V).

Install an extension spindle, as necessary, to ensure the top of spindle is 350 mm below FSL.

Install a valve bypass as specified (refer to Drawings WAT-1406-V and WAT-1407-V).

Consult the Superintendent for instruction if the Design Drawings show the location of a valve,

hydrant, chamber or surface fitting to be in a roadway, driveway, paved area or any other area

which may restrict access for operation and maintenance purposes or endanger operation and

maintenance staff or damage the water main when in service.

HW clause titled Valves, Hydrants and Surface Fittings

Seek direction if the design location of a valve, hydrant, chamber or surface fitting is in a roadway,

driveway, paved area or any other area which may restrict access for operation and maintenance

purposes or endanger operation and maintenance staff or damage the water main when in

service.

15.13.2 Valve chambers for large diameter mains


Construct valve chambers and install covers of the type, size and locations shown in the Design

Drawings.

Refer to Drawings WAT-1308-V, WAT-1309-V, WAT-1350-H and WAT-1351-H.

Not used

15.14 Scours Insert new clause as follows:

Construct gravity and pumped scours of the type, size and locations shown in the Design

Drawings.

Refer to Drawing WAT-1307-V.

Not used

15.15 Bored Pipes Under Roads, Driveways and Elsewhere



Construct bored water mains under roads, railways, driveways, footways and elsewhere of the

type, size and locations shown in the Design Drawings.

Where practicable, use a continuous pipe under road carriageway. Where impracticable, limit

jointing to a single joint beneath the road carriageway.

Construct encasing pipe as detailed in the Design Drawings.

Secure the main in place using hardwood skids or a proprietary concentric support insulator

system between the water main and the bored hole or encasing pipe as specified.

Where grouting of the annulus between the encasing pipe and the main is specified , commence

grouting from the downhill end of the bore. Use gravity or pressure grouting. Check that the

If grouting of the annulus between the encasing pipe and the main is specified, comm ence

grouting from the downhill end of the bore. Ensure that the applied pressure will not cause

buckling of the main. Achieve full penetration and complete filling of the void.

Insert plastic slippers between the water main and the bored hole in accordanc e with the

manufacturer’s instructions.

of 54


applied pressure will not cause buckling of the main. Achieve full penetration and complete filling

of the void.

In the case of an unsupported bore (i.e. no encasing pipe utilised) complete all pipework and

grouting within 24 h.

Where the installation of a cathodic protection system is specified for an encasing pipe,

constructed using steel pipe which are greater than 10 m in length, contact the Superinte ndent

to arrange for the installation of magnesium anodes and electrical test points in accordance with

the Design Drawings and/or Specification.

As required by applicable Regulation, register the cathodic protection system.

Only install cathodic protection systems using a cathodic protection specialist authorised by the

Water Agency.

Refer to Drawings WAT-1211-V, WAT-1212-V, WAT-1213-V, WAT-1214-V and

WAT-1255-H.

15.16 Aqueducts Insert new clause as follows:

Construct aqueducts of the type, size and locations as specified.

Refer to Drawings WAT-1310, WAT-1311 and WAT-1355-H.

Not used

15.17 Bridge Crossings Insert new clause as follows:

Construct bridge crossings of the type, size and locations as specified.

Refer to Drawing WAT-1312.

Not used

15.18 Appurtenance Location Marking



Provide location marker posts, plates and other markings for the location of hydrants, valves,

scours, flushing points and other fittings at the locations and in the manner as required on the

Design Drawings and Specification.

HW clause titled 15.16 Location Markers

Provide marker plates facing each surface fitting fixed to a permanent wall, fence or post. If no

convenient fixing is possible within ten metres of the surface fitting, provide a marker post. Also

indicate the location of surface fittings by stencilling 100 mm high letters on the adjacent kerb

using yellow road marking paint.

15.19 Flanged Joints Delete existing clause


Connect flanged joints in accordance with Design Drawing(s) using specified gaskets or O -rings

and bolting (refer to Drawing WAT-1313).

When installing pipes containing screwed flanges, take care to prevent cracking of the thread

sealant. At all times during installation and prior to inserting the bolts, ensure that the matching

pipe and valve/fitting are fully supported. Tighten bolts in the sequence nominated in the Design

Drawing(s). Use a torque wrench to achieve the nominated tightening torque.

For PE pipelines use a butt welded PE stub flange /adaptor with a stainless steel backing ring

conforming requirements of the Specification.

Further information on metal backing flanges for pipe flange adaptors for use with PE pipelines

is given in the Plastics Industry Pipe Association Technical Guideline POP007.

When installing pipes containing screwed flanges, take care to prevent cracking of the thread

sealant. At all times during installation and prior to inserting bolts, ensure that the matching pipe

and valve/fitting are fully supported.

15.20 Welding of Steel Pipelines

15.20.1 General

Insert new 4th, 5th and 6th paragraphs as follows:

Apply external corrosion protection to welded joints, using an approved tape system or heat-

shrinkable sleeve.

Reinstate cement mortar linings for pipes ≥DN 750 as specified.

HW clause titled 15.18 Welding of Steel Water Mains

Weld steel pipe in accordance with Category SP of AS/NZS 1554.1 employing welders qualified

in accordance with AS/NZS 1554.1.

Pre-qualify all weld preparations in accordance with AS/NZS 1554.1.

http://www.pipa.com.au/

of 54


Refer to Drawings WAT-1400, WAT-1401-V, WAT-1402, WAT-1403, WAT-1404,

WAT-1408-V and WAT-1450-H.

Inspect all welding in accordance with AS/NZS 1554.1, Section 7.

15.20.2 Field welding of flanges

1st paragraph – delete


Field welding of flanges shall only be carried out with the written approval of the Water Agency.

Weld flanges either directly to the pipe or fitting after machining or to a coaming piece that can

be subsequently butt welded to the pipe or fitting.

Align flanges at right angles to the axis of the pipe or to the relevant leg of the fitting.

Attach flanges by one of the following procedures depending on steel plate thickness:

(a) Where the pipe or fitting is 10 mm thick, weld the flange in accordance with AS 4041

Figure 3.24.4.8(H)(a) Type 6 slip-on weld.

(b) Where the pipe or fitting is >10 mm thick, weld the flange in accordance AS 4041

Figure 3.24.4.8(B) Type 2 “face and back” or Figure 3.24.4.8(D) Type 3A “bore and back”.

15.20.3 Reinstatement of cement mortar lining


For sizes ≥DN 750 reinstate the cement mortar lining using an approved primer and a mortar mix

consisting of clean sharp sand and Portland cement in a ratio of 2:1.

Apply the cement mortar for the specific joint configurations in accordance with Figures 15 .1 to

15.4 inclusive.

Due to confined space entry constraints, it is not possible to reinstate the cement mortar lining

of welded pipes ≤DN 750.

For pipes ≤DN 750, treat the unlined internal surface (i.e. projection beyond cement mortar lining

of the joint) as specified in the relevant WSAA Product Specification or WSAA appraisal for steel

pipes not covered by a WSAA Product Specification.

Product Specifications WSA PS–203 and WSA PS–204 require zinc/aluminium metal spray to be

factory applied to the internal ends of ball and spigot and slip-in welded joint steel pipes of sizes

<DN 750.


15.20.4 Reinstatement of external corrosion protection at joints using a tape system

15.20.4.1 Surface preparation


Prepare the surfaces as follows:

(a) Remove all weld splatter.

(b) Grind smooth any raised areas.

(c) Smooth any rough cut edges of existing coating;

(d) Wire brush all surfaces to be wrapped removing loose deposits and surface rust; and

(e) Dry all surfaces to be wrapped.


15.20.4.2 Priming surfaces


Prime the surfaces to be wrapped for the specific joint configurations in accordance with Figures

15.1 to 15.4 inclusive as follows:

(a) Use only the primer supplied by the tape manufacturer;

(b) Apply a thin even coat of primer in accordance with the manufacturer instruction; and

(c) Ensure the primer overlaps the existing coating by at least 200 mm.


15.20.4.3 Mastic filler Insert new clause as follows: New clause – not included

of 54


As necessary apply the mastic filler to the area to be reinstated for the specific joint

configurations in accordance with Figures 15.1 to 15.4 inclusive as follows:

(a) Use only the mastic filler supplied by the tape manufacturer; and

(b) Contour any irregular profiles with filler to ensure the tape will not bridge when applied.

15.20.4.4 Tape application


Apply the tape to the area to be reinstated for the specific joint configurations in accordance with

Figures 15.1 to 15.4 inclusive as follows:

(a) Spirally apply the tape;

(b) Ensure at least a 55% overlap between successive layers is achieved;

(c) Ensure tape is free of wrinkles and voids; and

(d) Ensure the tape overlaps the existing coating by at least 150 mm.

FIGURE 15.1 BALL AND SOCKET JOINT

FIGURE 15.2 SLIP-IN WELDED JOINT


of 54


FIGURE 15.3 PLAIN END WELDED COLLAR JOINT

FIGURE 15.4 PLAIN END BUTT WELDED JOINT

15.20.5 Reinstatement of external corrosion protection at joints using a heat-shrinkable sleeve system

15.20.5.1 Surface preparation


Prepare the surfaces in accordance with Clause 15.20.4.1, by:

(a) removing all weld splatter;

(b) grinding smooth any raised areas;

(c) smoothing any rough cut edges of existing coating;

(d) wire brushing all surfaces to be coated removing loose deposits and surface rust; and

(e) drying all surfaces to be coated.


15.20.5.2 Preheat pipe Insert new clause as follows:

Preheat joint area to the minimum preheat temperature or greater in accordance with

manufacturer’s instructions. Measure temperature at 3, 6, 9 and 12 o’clock positions to ensure

uniform heating throughout the joint area.


15.20.5.3 Priming surfaces


Prime the surfaces to be coated for the specific joint configurations in accordance with Figures

15.1 to 15.4 inclusive as follows:

(a) Where primer is specified, apply a thin even coat primer supplied / recommended by the

heat-shrinkable sleeve manufacturer.


of 54


(b) Ensure the primer overlaps the existing coating by at least 200 mm.

15.20.5.4 Mastic filler Insert new clause as follows:

As necessary, apply the mastic filler to the area to be reinstated for the specific joint

configurations in accordance with Figures 15.1 to 15.4 inclusive as follows:

(a) Use only the mastic filler supplied / recommended by the heat-shrinkable sleeve

manufacturer; and

(b) Contour any irregular or steep profiles (drop downs) with the filler to ensure the sleeve will

not bridge or void when applied.


15.20.5.5 Heat-shrinkable sleeve preparation


Cut the appropriate length of heat-shrinkable material to form a sleeve that allows sufficient

overlap in accordance with the manufacturer’s instructions. Trim the corners of the underlying

end of the sleeve in accordance with the manufacturer’s instructions.


15.20.5.6 Heat-shrinkable sleeve application


(a) Apply the sleeve to the area to be reinstated for the specific joint configurations in

accordance with Figures 15.1 to 15.4 inclusive and the manufacturer’s instructions.

(b) Ensure the sleeve edges line up and sleeve ends overlap near the 12 o’clock position. The

sleeve needs to extend at least 100 mm over sound coating on either side of the area to

be coated.

(c) During shrinkdown, use a silicon roller to ensure that the sleeve is free of wrinkles and

voids; and

(d) Visually verify that the mastic beading is present along sleeve edges.


15.21 Welding of PE Pipelines


Electrofusion welding and butt fusion may be used for joining pipe-to-pipe or fitting-to-pipe. All

welding shall be performed by welders who have successfully completed training by a Registered

Training Organisation, endorsed by the Plastics Industry Pipe Association for the relevant

welding method(s).

The Plastics Industry Pipe Association provides technical guidelines for electrofusion welding –

POP001 and butt welding – POP003.

Undertake all welding in accordance with the Specification and relevant Design Drawings.

Refer to Drawings WAT-1102-V and WAT-1409.


16 Pipe Embedment and Support

16.1 General



Provide embedment and support of the type as specified.

Insert new 3rd paragraph as follows:

For pipeline projections such as pipe sockets, flanges or couplings, excavate pockets in the

bedding material so that the pipe is fully supported. Ensure the bedding below any projection is

not less than 50% of the specified bedding depth.

Place embedment material uniformly along and around the whole length of the pipe barrel,

couplings and other appurtenances in a manner to ensure uniform density of side support

(including haunch support) and overlay with no distortion, dislodgment or damage to the water

main.

Where the water main is supported on concrete, do not place overlay material until the concrete

has obtained its initial set.

16.2 Embedment Materials



Use embedment materials that comply with the maximum particle sizes in Table HW 14.1.



of 54


Use embedment materials as specified in the Design Drawings or Specification (refer to Drawings

WAT-1201-V, WAT-1202, WAT-1203, WAT-1204-V, WAT-1250-H and

WAT-1251-H).

The Water Agency may require embedment materials to be authorised.

Materials conforming to Product Specifications WSA PS–350, WSA PS–351, WSA PS–360 and

WSA PS–361 are typically used. Agency approval is required for embedments comprising

recycled materials to WSA PS–364 and WSA PS–365.

Single size coarse aggregates of sizes 7, 10 and 14 mm are generally deemed to be “self-

compacting” i.e. can achieve specified density index by rodding and/or forking when placed

around a pipe, but may not provide adequate conductivity for cathodically protected steel

pipelines.

16.3 Compaction of Embedment

16.3.1 Methods

Delete existing clause including Table HW 16.1


During placement, compact embedment material in layers to uniformly support the pipe and to

achieve the degree of compaction specified in Table 19.1 (refer to Drawings

WAT-1250-H and WAT-1251-H).

When choosing compaction equipment, the number of passes and the thickness of layer to be

compacted, take account of the material to be compacted and the pipe to be installed.

Do not employ compaction equipment or methods that produce horizontal or vertica l earth

pressures that may cause damage to or excessive distortion of the water main.

Do not use flooding compaction unless specifically authorised by the Superintendent and the

Water Agency.

If flood compaction is authorised:

(a) only use in situations where embedment material and the surrounding native soils are non-

cohesive and completely free draining;

(b) only use beneath non-trafficable areas where compaction trials have been undertaken and

proven successful; and

(c) do not use beneath trafficable areas.

Compact in layers to achieve the degree of compaction specified in Table HW 16.1 uniformly

throughout the depth of each layer.

Do not use flooding compaction.

Treat single size coarse aggregates of sizes 7, 10 and 14 mm as “self -compacting” and do not

compact.

16.4 Special Bedding and Embedments/Geotextile Surround and Pillow


Install special embedment at locations as specified.

Refer to Drawings WAT-1203 and WAT-1204-V.

NOTE: Special embedments for inadequate or poor foundations should be selected after receiving

geotechnical and structural advice.

Not used

16.5 Removal of Trench Supports


Except where the Design Drawings specify otherwise, lift temporary trench support systems

progressively above each layer of embedment to ensure that each layer is compacted against

undisturbed native soil (trench wall).

Not used

16.6 Concrete Embedment and Encasement



Set pipes to line and level on either bags of natural fibre filled with sand and cement mix or on

concrete blocks or saddles cast to the outside diameter of the barrel and located near the socket.

Ensure that pipes do not move, float or deform while pouring concrete.

of 54


Concrete embed or encase pipes in accordance with Specification and/or Design Drawings (refer

to Drawings WAT-1203, WAT-1204-V, WAT-1211-V, WAT-1212-V, WAT-1213-V and WAT-1255-

H).

For encasement, set pipes to line and level on bags of natural fibre filled with sand a nd cement

mix or on concrete blocks or saddles cast to the outside diameter of the barrel and located near

the socket. At the junction of unencased pipeline and the concrete encased section, provide

flexible connections as specified.

Provide construction joints as specified.

Observe requirements of Clause 12.5 when transporting, handling and placing concrete.

Ensure that pipes do not move or deform while pouring concrete.

Provide rubber-ring jointed pipe "shorts" 600–1000 mm long immediately upstream and

downstream of the concrete embedment or encasement to allow for differential movement.

17 Fill

17.1 Trench Fill


Placement and compaction of trench fill is critical to avoiding subs idence over or near the trench

and consequent damage to pavements and structures.


17.1.1 Material requirements

17.1.1.1 Trafficable areas



Trafficable areas include:

(a) The full width of any existing or proposed road carriageway plus shoulders, and extending

to 1 m beyond the shoulders or kerbs.

(b) The full width of any property access driveway, and extending 1 m either side.

(c) The full length of any constructed footway including, but not limited to, concrete, asphalt,

crushed rock pavements.

(d) The full width of any median strip.

(e) Any other areas subject to vehicular traffic.

Where the filled trench will be subjected to traffic loading, ensure the fill material complies with

the road Owner’s specifications or Water Agency nominated specifications. In the absence of a

directive, obtain approval to use one of the following:

(i) For trenches in trafficable areas other than footways less than 1.5 m deep, 20 mm

Class 2 plant mixed wet mix crushed rock, for the full depth or a suitable equivalent;

(ii) For trenches in trafficable areas other than footways that are 1.5 m deep or greater:

(A) 20 mm Class 2 plant mixed wet mix crushed rock for the top 600 mm; or

(B) 20 mm Class 4 (or better) crushed rock for the remainder, or other trench fill

material specifically approved by the road Owner.

(iii) For trenches under footways, 20 mm Class 4 (or better) crushed rock, or other trench

fill material specifically approved by the road Owner.

The specification of trench fill material will vary throughout Australia. To address this issue WSAA

has prepared more than one product specification for trench fill material to accommodate

different Water Agency requirements, locally available rock types quarried and processes use d

to produce these materials. Water Agencies should nominate product specifications that are

approved for use.

HW clause titled Material requirements

Where the filled trench will be subjected to traffic loading, the fill material shall comply with the

requirements of the road Owner. In the absence of a directive, use 1:16 cement stabilised

compaction sand.

17.1.1.2 Non-Trafficable areas


Use a trench fill material complying with the Specification.


of 54


Where well-graded granular materials (e.g. crushed rock) are specified, seek guidance from the

Superintendent in relation to moisture conditioning.

If the Specification permits excavated material to be used as trench fill, ensure it is free of organic

material and that it contains no rock or hard clay greater than 75 mm and that it can be compacted

to the required degree of compaction.

Where excavated material is a cohesionless soil (e.g. clean sand, silty sand and poorly graded

sand and gravel mixtures) use only in those areas where the natural soils within which works are

being undertaken are also cohensionless.

Where cohesionless soil fill is proposed in areas where the natural soils are cohesive (e.g.

clayey) do not use unless approved by the Designer, in which case comply with an y additional

requirements for placement and compaction.

17.1.2 Placement Delete existing clause


Place trench fill in accordance with the Design Drawing(s) (refer to Drawings WAT-1201-V, WAT-

1202, WAT-1203, WAT-1204-V, WAT-1250-H and WAT-1251-H).

Use appropriate methods of compaction to achieve the compaction requirements of the Design

Drawings and Specification and to prevent settlement or subsidence over the trench.

The contract for the works may require the constructor to make good damage caused as a

consequence of subsidence (e.g. damage to, including tilting of, fences, buildings and

pavements).

Avoid impact loading of the water main during placement of trench fill material.

Do not place trench fill material within 24 h of placing concrete embedment or encasement, or

longer period if shown in the Design Drawings or Specification.

Fill voids behind timber ground support in close-timbered tunnels, drives and shafts by pressure

grouting or other authorised means.

Take special care to prevent displacement of any valve or hydrant access cover assembly or

supports.

Correct any deficiencies of trench filling exposed by settlement.

Avoid impact loading of the water main during placement of trench fill material.

Do not place trench fill material within 24 hours of placing concrete embedment or encasement.

Take special care to prevent displacement of any valve or hydrant access cover assembly or

supports.

Correct any deficiencies of trench filling exposed by settlement.

17.1.3 Compaction of trench fill

Delete existing clause including Table HW 17.1


Ensure trench fill compaction satisfies the requirements of Table 19.1 and Clause 19.3.1.

Compact trench fill material in layers to achieve the required density uniformly throughout the

depth of each layer.

Do not commence mechanical compaction of fill material directly above the pipe until the total

depth of cover above the pipe is adequate to prevent damage to the main.

The depth of fill material required before mechanical compaction can be used depends on the

type of compaction device.

For hand-held or walk-behind equipment, provide at least 200 mm cover and for larger “ride-on”

machines operating within the trench, increase this depth at least 300 mm.

Compact trench fill material in layers to achieve the degree of compaction specified in Table HW

17.1 uniformly throughout the depth of each layer.

Do not commence mechanical compaction of fill material directly above the pipe until the total

depth of cover above the pipe is adequate to prevent damage to the main.

For hand-held or walk-behind equipment, provide at least 200 mm cover and for larger “ride-on”

machines operating within the trench, increase this depth at least 300 mm.

of 54


Treat single size coarse aggregates of sizes 7, 10 and 14 mm as “self -compacting” and do not

compact.

17.2 Embankment Fill Delete existing clause


Where the design requires filling or construction of an embankment, undertake in accordance

with the Design Drawings and/or Specification.

Consult Superintendent to ascertain if supervision is required by the geotechnical specialist

(Designer).

Where filling or construction of an embankment is required and is not defined in the Design

Drawings and/or Specification, consult the Designer to provide:

(a) the degree of clearing required to establish an embankment foundation;

(b) the level of compaction of embankment fill material required;

(c) the preferred method of placement and compaction;

(d) any placement and/or compaction limitations over the top of the pipeline; and

(e) any special conditions associated with placement and/or compaction of the remainder of

the fill in layers.

NOTE: Geotechnical assessment prior to commencement and subsequent supervision of the

work may be required.

Where the route of a main requires filling or construction of an embankment :

(a) Clean away all debris, vegetation, organic material and topsoil for the ful l width of the fill

area.

(b) Compact the cleared soil surface to not less than 95% of its standard maximum dry density

(AS 1289.5.1.1).

(c) Place the fill in layers not exceeding 200 mm thickness and compact each layer to not less

than 95% of its standard maximum dry density (AS 1289.5.1.1). Bring the compacted fill

level up to a height of at least 300 mm above the design level of the top of the pipe.

(d) Place the remainder of the fill in layers not exceeding 300 mm thickness and compact each

layer to not less than 95% of its standard maximum dry density (AS 1289.5.1.1).

17.3 Drives and Tunnel Fill


Refill drives and tunnels above the embedment zone to the obvert of the drive or tunnel using

one of the following methods of filling as specified:

(a) Authorised trench fill material pneumatically placed.

(b) Sand-lime-cement slurry pressure grouted.

(c) Sand-lime-cement slurry gravity grouted (only to be used where there is sufficient head

space available to ensure adequate grouting of the water main).

(d) Sand bags hand placed and rammed.

Not used

Delete Clause HW 17.4 Provision for Settlement HW 17.4 PROVISION FOR SETTLEMENT

Through other than pavements, lawns or other improved surfaces, place trench fill sufficiently

high to compensate for expected settlement. Subsequently, carry out further filling or trim the

original trench fill, in order that the surface level of the completed trench conforms to the adjacent

surface.

Within public and private property, where the reasonable convenience of persons requires

trenches to be levelled off at the time of filling, make any subsequent settlement good as

necessary by placing and compacting additional fill and restoring the surface to no less than its

pre-existing condition.

18 Swabbing

18.1 General Delete existing clause


A Water Agency may determine that mains need not be swabbed if the Constructor declares in

writing that all requirements of Clauses 15.1.1, 15.1.2 and 15.1.4 were adhered to during

construction.

HW clause titled 18 Flushing and Swabbing

Upon completion of all construction activity, flush and clean all water mains to minimise the risk

of contamination.

Where it is deemed that flushing does not effectively clean the main, the Superintendent may

direct that at least one swab run be undertaken.

of 54


Irrespective of any such declaration, swab mains if:

(a) there is evidence that pipes and/or fittings are contaminated with dirt or other foreign

material; and/or

(b) the main was flooded during construction; and

(c) the main fails bacteriological testing (Refer to Clauses 19.7 and 20) and/or

(d) as required by the Superintendent.

Subject the total length of all newly constructed water mains ≥DN 100 to at least one swab run

to ensure that the mains are free of deleterious material.

Swab after the satisfactory completion of all pipework and prior to the commissioning of the main,

and prior to disinfection where disinfection has been specified.

Carry out swabbing of mains as a series of swab runs.

Insert swabs clear of any fittings into the main downstream of the controlling valve used to make

the connection to the existing main or to the previously swabbed new main.

Install a discharge assembly at the end of the swab run and set up so as to direct discharge

water clear of the trench and to prevent scouring or flooding of the surrounding area. For mains

DN 225 diameter and larger, fit a swab discharge control unit at the discharge end.

18.2 Swabs Insert new 1st paragraph as follows:

A swab is typically a section of foam that is inserted into the water main and using the flow of

water, pushed towards a discharge point, forcing deleterious material from the system.

Insert new 2nd paragraph as follows:

Hunter Water does not generally require mains to be swabbed, however, where a main is to be

swabbed the requirements of this clause and Clause 18.3 shall apply.

Insert new 8th paragraph as follows:

For DN 100 to DN 150 mains inclusive, swabs may be inserted at hydrants.

Use new pre-packaged swabs.

Store and handle swabs hygienically.

Use at least two swabs for each swab run.

Select swabs of a size appropriate to the main size in accordance with Table 18.1.

Insert swabs during construction into the main at connection point(s) of new mains to existing

mains or into previously swabbed new mains.

18.3 Swabbing Procedure Delete existing clause


Large swabs may be vacuum shrunk before insertion .

Use the following swabbing procedure for each swab run:

(a) Number all swabs and record where they are inserted into the main.

(b) Insert swabs using a clean plunger.

(c) Isolate the length of water main subject to swabbing by closing appropriate valves,

including valves on off-take mains, gate valves on copper and polyethylene sub-mains and

large size service connections where applicable. Close all hydrants within the limits of the

swab run. Carry out swab runs prior to charging and flushing the main(s).

(d) Operate the controlling valve to propel the swab along the water main swab route at a

velocity of between 0.5 and 1.0 m/s.

Use the following swabbing procedure:

(a) Insert swabs using a clean plunger.

(b) Isolate the length of water main subject to swabbing by closing appropriate valves,

including valves on offtake mains, gate valves on copper and polyethylene sub -mains and

large size service connections where applicable. Close all hydrants within the limits of the

swab run. Carry out swab runs prior to charging and flushing the main(s).

(c) Operate the controlling valve to propel the swab along the water main swab route at a

velocity of between 0.5 and 1.0 m/s.

(d) Upon removal of the swabs, flush the main until the discharged water is clear and then

close the controlling valve.

(e) Repeat procedures (a) to (d) using new clean swabs as directed by the Superintendent if

a large amount of debris is discharged or if after a reasonable flushing time the discharging

water remains discoloured.

of 54


This velocity can generally be achieved by opening the controlling valve approximately 1½

to 2½ turns for DN 100 to DN 150 mains or 2 to 4 turns for larger mains.

(e) Upon removal of the swabs, flush the main until the discharged water is clear and then

close the controlling valve.

(f) Repeat procedures (b) to (e) using new clean swabs as directed by the Superintendent if

a large amount of debris is discharged or if after a reasonable flushing time the discharging

water remains discoloured.

(g) Record the number of each swab as it leaves the main to ensure that none are left in the

main.

(h) Only remove the discharge assembly when it is sure that entry into the main of deleterious

matter or discharged water has been prevented and the results of bacteriological testing

are satisfactory (Refer to Clause 19.7).

(i) Dispose of swabbing wastewater in accordance with the relevant Regulator and Water

Agency requirements.

(f) Only remove the discharge assembly when it is sure that entry into the main of deleterious

matter or discharged water has been prevented and the results of bacteriological testing

are satisfactory.

(g) Dispose of swabbing wastewater in accordance with the relevant Regulator and Water

Agency requirements.

19 Acceptance Testing

19.1 General Insert new clause as follows:

Acceptance testing is required to test the capability of the pipeline assembly to satisfy design

requirements as specified. It is not intended to test the material capability. Testing is intended

to:

(a) Reveal the existence of any assembly and structural faults.

(b) Ensure the water main can sustain pressures greater than the maximum operating

pressure without leakage.

(c) For open trench construction, confirm the success of placement and compaction of pipe

embedment and trench fill, design and placement of thrust and anchor blocks and

installation of pipeline components.

(d) For trenchless construction, confirm the success of the installation in accordance with the

trenchless construction specification.

(e) Ensure that the pipeline is not contaminated.

Undertake acceptance testing of all water mains and structures in accordance with the

Specification and in the following order:

1 Visual inspection.

2 Compaction testing (open trench construction only).

3 Hydrostatic pressure testing.

4 Water quality testing.

5 Special testing such as block testing dual water supply systems for connectivity,

insulated joint resistance testing and specified trenchless construction testing.

Undertake notification of acceptance testing and adopt responsibilities for reporting in

accordance with the Water Agency’s requirements. All test results, including unsatisfactory

results, shall be documented and reported to the Superintendent.

Where specified, clean pipes, fittings and structures before any tes t is performed.

Unless otherwise permitted by the Water Agency, arrange testing by a Recognised Testing

Laboratory.

Not used

of 54


If any of the tests prove to be unsatisfactory, detect and rectify the fault. Continue to rectify and

retest the water main, property service, connection, joint etc. until a satisfactory test result is

obtained. Even if testing produces satisfactory results, rectify any water main, property service,

connection, joint, structure or appurtenance that has a visible or detectable leak, block age,

malfunction or other defect.

19.2 Visual Inspection Insert new clause as follows:

Visually inspect all water mains and their component markers to ensure the pipeline assembly

and the type and location of markers are as specified.

Verify by inspection of purchasing records and/or visual examination and/or other appropriate

means that all products and materials used are approved by the Water Agency.

Not used

19.3 Compaction Testing


Table 19.1 specifies default methods of compaction testing and required results that

demonstrate adequate pipe support and stable trench fill.

Alternative test methods and more stringent values specified in the Project Specification or

Design Drawings shall take precedence. For trafficable areas, the road Owner’s specification

shall take precedence.

Test methods for determining the degree of compaction shall comply with the appropriate part of

AS 1289.

Not used

19.3.2 Compaction testing requirements

19.3.2.1 General


Undertake field density testing of engineered or controlled fill, pipe embedment, trench fill and

embankments in accordance with the methods specified by Table 19.1.

Test results shall conform to the requirements of Table 19.1.

Test locations shall be representative of the filled area, trench or embankment.

Drives and tunnel fill do not require compaction testing.

Not used

19.3.2.2 Trafficable areas test zone


For compacted material located in a trafficable zone, the extent of fill/trench represented by a

test shall be 300 m2 in area with its centre at the spot where the test is made. The depth of the

material represented by the test shall be deemed to be the full depth of fill (i.e. from the surface

of the filled area to the top of the foundation or native ground).

Not used

19.3.2.3 Non-trafficable areas test zone


For compacted material located in a non-trafficable zone, the extent of fill/trench represented by

a test shall be 1200 m2 with its centre at a spot where the test is made. The depth of the material

Not used

of 54


shall be deemed to be the full depth of fill (i.e. from the surface of the filled area to the top of the

foundation or native ground).

19.3.2.4 Frequency and location of tests


For compacted material located in a trafficable zone, conduct one test in each 300 mm of the

depth of fill and each 300 m2 of area or part thereof.

For compacted material located in a non-trafficable zone, conduct one test in each 900 mm of

the depth of fill and each 1200 m2 of area or part thereof.

The Superintendent may carry out random confirmatory tests.

Not used

19.3.2.5 Retesting Insert new clause as follows:

For non-trafficable areas, if one or more of the initial test results do not comply with Table 19.1,

conduct two additional tests in each of the areas of the relevant depth of fill represented by the

initial failed test(s). If any of the additional tests do not comply, re -compact the represented

compacted material zone and repeat the testing. Continue this cycle until the compaction test

results comply.

For trafficable areas, if any test results do not comply with Table 19.1, re-compact the

represented compacted material zone and repeat the testing.

Not used

19.4 Hydrostatic Pressure Testing

19.4.1 General


Use calibrated gauges that are controlled under the operator’s or testing contractor’s QA system

for pressure testing.

Use mains water or other disinfected water for pressure testing.

For mains constructed using trenchless technology, undertake pressure testing before

connection to the existing water main or the new section of water main installed using open

trench construction.


Delete Clause 19.4 Pressure Testing

Delete Clause 19.4.1 General

Delete Clause 19.4.2 System test pressure

Delete Clause 19.4.3 Satisfactory pressure test

19.4 PRESSURE TESTING

19.4.1 General

Pressure test all water mains in accordance with AS/NZS 2566.2 Appendix M, paragraph M4 or

M5 as appropriate. Arrange testing by an organisation accredited by NATA to perform the test.

Submit test results.

Testing may be conducted progressively, but must be no earlier than 7 days after completion of

the section to be tested.

If any of the tests prove to be unsatisfactory, locate and rectify the fault, and re-test. Continue to

rectify and re-test until a satisfactory test result is achieved. Even if testing produces satisfactory

results, rectify any water main or conduit in which there is a visible or detectable leak, blockage,

malfunction or other defect.

19.4.2 System test pressure

Determine an appropriate system test pressure (STP) such that each section of the water main

being tested is subjected to a STP within the range:

DP<STP<1.25 DP

19.4.3 Satisfactory pressure test

The test length shall be acceptable if:

of 54


(a) There is no failure of any thrust block, anchor block, pipe, fitting, valve, joint or any other

pipeline component;

(b) There is no visible leakage; and

(c) For other than PE, PP and ABS pipelines:

Q ≤ 0.14LDH

where: Q = allowable make-up water in litre per hour

D = nominal diameter of the test length in metres

L = length of the test length in km

H = average test pressure over the test length in metres

For PE, PP and ABS pipelines:

V2 ≤ 0.55V1-Q

where: Q is determined as for other than PE, PP and ABS

V1 = make-up water in litres between hours 2 and 3

V2 = make-up water in litres

between hours 4 and 5

19.4.2 Mains Insert new clause as follows:

Pressure test all drinking and non-drinking water mains.

Conduct and report testing in accordance with Section 6 of AS/NZS 2566.2:2002 using the test

method nominated in the Specification.

If any of the test results are unsatisfactory, detect and rectify the fault and re -test. Rectify any

water main in which there is a visible or detectable leak or blockage.

Unless otherwise permitted by the Superintendent, adopt a maximum test length of 1000 m.

Acceptance testing may be conducted progressively with the authorisation of the Superintende nt.

Testing may be carried out as soon as the Works are completed and where concrete thrust

restraint curing times have lapsed.

Where isolation is available, the water main may be progressively tested in sections of at least

100 m, or in its entirety if the main is less than 100 m.

Visual detection of leaks may be adversely affected by wet weather.


19.4.3 Property services Insert new clause as follows:

Hydrostatic pressure test property services in conjunction with the reticulation mains, where

possible.

Along with the process of pressure testing the reticulation main, open the maintap (ball valve) or

electrofusion tapping saddle (with integral cutter and service isolation valve) at the reticulation

main, for each property water service and close the ball valve at the lot boundary or meter

isolation valve, as applicable, to pressure test each property service.

In order to ensure escape of entrapped air and as part of checking that property services are

connected are to the correct water supply main (drinking or non-drinking), temporarily open ball

valves at each lot boundary until water flows through the service free of air. Rectify any faults

that are found.


of 54


If property services are required to be tested separate to mains testing, ensure the maintap at

each connection is opened following the pressure test.

In some instances, the Water Agency may approve Constructor’s requests to lay property

services after successful pressure testing of the water main and when all other utilities’ assets

have been installed to prevent interference and damage.

19.4.4 Under pressure cut-in connections


Test the connection assembly on the host pipe prior to drilling in accordance with this Clause

and any other Water Agency requirements.

Before cutting-in to the host pipe, pressure test the assembly by applying a pressure that is

400 kPa above the operating pressure of the pipeline, but does not exceed 1600 kPa, for a period

not less than 3 minutes.

Visually inspect the assembly for leaks.

Accept the pressure test on the assembly if there is:

(a) no visible leakage; and

(b) no failure of any pipe, off-take, valve, joint or any other assembly component.

In the event of a failure, detect and rectify the fault, and re-test. If a satisfactory test cannot be

achieved, use an alternative method of connection, such as an inserted tee.

Visually inspect the completed connection assembly for leaks.

In the event of a leak, detect and rectify the fault, and test the completed connection assembly

and associated connecting pipework.


19.5 Block Testing Dual Water Supply Systems for Connectivity


Separately test each system of a dual water supply system (dr inking and non-drinking reticulation

networks) to prove that there are no cross-connections in either water supply. During block

testing, which comprises testing in isolated portions of the network or “blocks”, ensure all

temporary cross-links are closed or physically disconnected, as required by the Water Agency,

except where a cross-link is used as the sole temporary supply from the drinking water supply

system to a block in the dual water supply system and the non-drinking water supply system is

being checked following a satisfactory test of the drinking water supply system.

Undertake block testing in accordance with Appendix K – Connectivity Inspection of Dual Water

Supply Systems after the procedures in the installation Inspection and Test Plan (Refer to Clause

15.1.2) are shown to have been followed to minimise the likelihood of cross-connections being

created.

Undertake connectivity inspection/testing at various stages as required by the Water Agency

including:

(a) as part of new water main commissioning;

(b) upon non-drinking water supply system commissioning;

(c) in conjunction with various audits of the dual water supply systems; and

(d) on an individual property basis for activities such as when a new water service is provided,

change of ownership or as part of a complaint investigation.


of 54


Conductivity testing of the water in the drinking and non-drinking water systems may be beneficial

in determining whether drinking water, non-drinking water or a mixture of waters is present in the

water mains of dual water supply systems .

Where specified by the Water Agency, undertake conductivity testing in conjunction with flow -

based connectivity testing of the systems.

Where conductivity testing is used adopt conductivity threshold levels specifi ed by the Water

Agency as representative of results that characterise water consisting solely of drinking water or

non-drinking water in dual water supply systems. Where not specified adopt the following

threshold levels:

(i) for drinking water a maximum threshold level of 250 mS/cm; and

(ii) for non-drinking water (recycled water sourced from sewage) a minimum threshold

level of 700 mS/cm.

19.6 Insulated Joint Resistance Test


Test the degree and integrity of electrical insulation of insulated joints, e.g. between an off -take

clamp and the valve, on either side of the insulated joint by stressing the insulated joint with

application of 500 V DC.

Apply the current using an insulation resistance tester (e.g. a proprietary insulation test device)

by placing one electrode on either side of the insulated joint at a distance of not more than

500 mm from the joint. Ensure good electrical contact with the items on each side of the insulated

joint under test e.g. the off-take clamp and the valve.

Record the readings.

Do not accept insulated joints with resistance readings under 500 k-ohms


19.7 Water Quality Testing

19.7.1 General


It is compulsory for all new mains to pass bacteriological tests.

Disinfection of drinking and non-drinking water mains may be required to ensure suitable water

quality parameters are maintained and to pass bacteriological tests. Disinfection may also be

required where there is a likelihood of contamination.

Conduct a bacteriological test on all new mains following satisfactory completion of

swabbing/flushing and pressure testing of the water main.


19.7.2 Test procedure Insert new clause as follows:

Conduct a bacteriological test on all new mains following satisfactory completion of

swabbing/flushing and pressure testing of the water main as follows:

(a) Scour past the sampling point.

(b) Engage a Recognised Testing Laboratory accredited for the test to collect representative

water samples from the test section of the water main.

(c) Dispose of testing water in accordance with the relevant environmental Regulator and/or

Water Agency requirements.


19.7.3 Satisfactory water quality test


Accept a section of water main if:

(a) The test results fall within the water quality parameter limits specified by Hunter Water for

drinking water and/or non-drinking water mains; or


of 54


(b) The water quality parameter test results in the test section of water main are no worse than

the water quality parameter test results measured by testing an influent sample of existing

mains water, provided that the influent sample was collected by the Recognised Testing

Laboratory at the same time as water sample from the test section of water main was

collected.

19.7.4 Failure of test Insert new clause as follows:

For failed sections of water main, swab, flush and/or disinfect the main and then re -test. Rework

until all test results are satisfactory.


20 Disinfection

20.1 Application Not used by Hunter Water

Not used

20.2 Flushing of Disinfection Water

Not used by Hunter Water

Not used

21 Tolerances on As-Constructed Work

21.1 General


Construct all water mains, associated structures and appurtenances in the positions shown on

the Design Drawings in accordance with the tolerances specified in Clauses 21.2 to 21.5

inclusive, except where water mains cross or run paralle l to other services when the minimum

clearances should be maintained.

Not used

21.2 Horizontal Tolerances

21.2.1 Water mains and in-line structures

No change Do not exceed the following positional tolerances:

(a) Water mains – 100 mm lateral displacement from the design water main alignment.

(b) Appurtenances and structures – lateral displacement as for the water main, and 200 mm

displacement (from the design position) along the water main axis.

21.2.2 Property services and meters

No change Do not exceed the following positional tolerances:

(a) Property services – 100 mm displacement along water main axis from the position as

specified.

(b) Water meters – 100 mm displacement from the position as specified.

21.3 Vertical Tolerances

21.3.1 Water mains, property connections and structures

No change Do not deviate the inverts of new water mains, property connections and structures from the

specified design level (or interpolated design level) by more than 50 mm higher or lower,

providing the depth from final ground surface level to the top of the pipe exceeds the minimum

cover stated in Standard Drawings.

Link up to existing water mains or structures at the design levels equal to or greater than the

minimum acceptable covers.

21.3.2 Verticality (“plumb”)

No change For hydrant risers, access chambers, shrouds and aqueduct piers, apply a tolerance at any point

on the pipe or structure as follows:

(a) 30 mm deviation (from vertical) per metre rise in any direction; and

(b) limited to a maximum 50 mm cumulative deviation (from vertical) in any one particular

direction for structures higher than 5 m.

21.4 Tolerances on Finished Surface Structures and Fittings

No change For structures and fittings designed flush with the ground / pavement surface or proud of the

surface, apply a vertical tolerance on the finished surface levels as follows:

(a) 5 mm in road reserves, including sealed pavements, road verges, driveways, footways,

and pedestrian thoroughfares.

of 54


(b) 5 mm in sealed and trafficable areas within private properties (pedestrian and/or vehicular

traffic).

(c) +50 mm,20 mm in private property including garden areas, unsealed areas,

non-trafficable areas and areas of occasional traffic (pedestrian and/or vehicular traffic).

21.5 Cast In-Situ Concrete Structures and Slabs



In addition to the tolerances of Clause 21.3, apply a construction tolerance of 0.5% or 5 mm

whichever is the greater on the specified dimensions except for concrete thrust and anchor

blocks and bulkheads where a construction tolerance +5% -2% may be adopted.

In all structures where reinforcement is specified apply reinforcement position tolerances

specified in AS 3600.

In addition to the tolerances of Clause 21.3, apply a construction tolerance of +5%2% on the

specified internal dimensions (e.g. diameter, length, width, depth etc.) for cast in -situ concrete

structures and the external dimensions of slabs.

Apply a construction tolerance on all thicknesses specified of +50 mm, –0.

22 Connections to Existing Water Mains

22.1 General



Connection is typically made directly to the existing mains via an under pressure cut -in or

inserted tee or to the end of a main or to the branch off-take of a pre-installed tee. In each case

the Works are to be connected and the supply to them made “live” only after satisfactory results

have been achieved from acceptance testing of the new works.

Undertake connection of new Works to existing water supply systems at a nominated connection

point, as shown in the Design Drawings.

Use methods and equipment authorised by the Water Agency or engage a Water Agency

accredited supplier to undertake the connection.

Comply with the relevant Water Agency’s requirements for Works on live water supply assets.

Do not make connections until all other Works are completed.

Negotiate a time for undertaking the connection with the Superintendent.

Except for under pressure connections (Refer to Clause 22.2), do not carry out connections on

days declared “Total Fire Ban”. Reschedule connections for a more appropriate time.

Shutdown of existing water mains shall be by Hunter Water personnel. A maximum duration of

the shutdown may be specified for each project. If no project specific maximum is specified, the

duration shall be no more than 4 hours.

Before giving notice of the date that shutdown is required:

(a) plan all work to minimise the duration of the shutdown;

(b) obtain approval of the proposed connection procedures including methods to confirm the

water main has been shutdown effectively; and

(c) make all components required for the cut-in available for inspection.

Give notice of the shutdown at least 10 working days prior to the date on which the shutdo wn is

required.

To minimise the duration of the shutdown, Hunter Water shall not commence the shutdown

unless:

(i) all pipes and fittings required for the connection are available at the connection point

and, where possible, have been assembled above ground ready to lift into place; and

(ii) the excavation required for the connection is complete and made safe prior to the

Water Agency’s shutdown personnel arriving on site.

Shutdown of the existing mains may not completely prevent the inflow of water into the section s

isolated.

Advise the Superintendent as soon as the water main can be re-charged.

22.2 Under Pressure Connections


Undertake under pressure cut-in connections to water mains as follows:

(b) Provide cut-in connection equipment in accordance with Clause 11.9.

(c) Provide all necessary materials and fittings required for the connection in accordance with

Clause 12.8.

(d) Carry out all necessary excavations in accordance with Clause 13.7 to the minimum

dimensions shown in the Design Drawings.

(e) Provide all shoring, barriers, lighting, traffic control and safety measures required to ensure

worker and public safety during the operation.

(f) Undertake the cut-in connection, including recording and reporting, in accordance with

Clause 15.5.

Not used

of 54


(g) Pressure test the connection when installed in accordance with Clause 19.4.4.

(h) Test the electrical resistance of insulation joints in accordance with Clause 19.6.

Repair and/or rectify any under pressure connections that fail any test and retest. Repeat until a

satisfactory result is achieved.

Following the installation and successful testing of the connection:

(i) Place embedment and support in accordance with Section 16 and where specified

in the Design Drawings, construct a thrust block.

(ii) Backfill excavation in accordance with Section 16.

(iii) Construct a shroud and install surface fittings in accordance with Design Drawings.

Refer to Appendix C - Under Pressure Cut-In Connections and Drawing WAT-1105-V.

22.3 Inserted Tee Connections

22.3.1 Shutdown of existing water mains


Temporary water supply systems may be required to maintain continuity of customer supply.

Shut down of the existing mains may not completely prevent the inflow of water into the sections

isolated. Pressure testing of an existing main and an inserted tee, to a pressure above the normal

operating pressures in the main, may not be possible nor desirable due to this internal leakage

past valves and the possible effect on the main (if deteriorated) and private water services.

Shutdown of water mains is generally only undertaken by the Water Agency or their network

operator.

Do not shut down existing water mains unless authorised or directed to do so by the Water

Agency.

Adhere to Water Agency notification requirements and operating procedures.

Where shutdown of the existing main is to be performed without a temporary alternative supply

being provided to maintain continuity for customers, undertake the following procedures:

(a) Give the required notice of shutdown of existing water mains. If no required notice is

specified, give at least 10 working days prior to the date on which the shutdown is required.

(b) Adhere to the maximum duration of the shutdown specified for the project. If no project

specific maximum is specified, make sure that the connection can be completed within

4 hours.

(c) Before giving notice of the shutdown:

(i) plan all work to minimise the duration of the shutdown;

(ii) obtain approval of the proposed connection procedures including methods to confirm

the water main has been shut down effectively; and

(iii) make all components required for the cut-in available for inspection.

(d) To minimise the duration of the shutdown, do not commence the shutdown unless:

(i) all pipes and fittings required for the connection are available at the connection point

and, where practicable, have been assembled above-ground ready to lift into place;

and

(ii) the excavation required for the connection is complete and made safe prior to the

Water Agency’s shutdown personnel arriving on site.

Not used

of 54


22.3.2 Making the connection to existing water main


Carry out all preparatory investigation, pipe and trench work, which may include, but not be

limited to:

(a) Excavate a shaft over the existing main to determine whether there will be difficulty in

making the connection, any special pipework required or excessive depth will be

encountered. Backfill the shaft until the day of connection unless directed otherwise by the

Superintendent.

(b) Assess whether the condition of the existing main is adequate to enable a watertight

connection process to eliminate contamination of mains.

(c) Ensure that specified minimum cover over the new main is maintained at connections by

lowering existing mains as necessary or providing a suitable form of vert ical connection.

Disconnect temporary private services from the existing main and plug the tapping point or

provide new pipework, if specified on the Design Drawings and/or Specification. Where

necessary work on reconfiguring temporary private services may be deferred until commissioning

of new reticulation mains that provide a new point of connection for these services .

Carry out the connection after the existing main has been shut down.

Ensure the excavation at the point of connection is kept free of water during the connection

process to eliminate contamination of the mains.

Ensure that adequate anchorage of the pipework, including the inserted tee, is provided during

the connection work.

Ensure that corrosion protection of the existing main is reinstated as necessary and that new

pipework is protected.

Disinfect components that are to be inserted into the existing main, unless otherwise authorised

by the Water Agency. This is to ensure adequate disinfection is provided where a longer term

contact disinfection using chlorinated water is not feasible.

Not used

22.3.3 Re-charging the shutdown water main


Re-charge the existing water main and inserted tee following the connection work.

Arrange the timing of re-charging, corrosion protection, anchorage, pressure testing,

disinfection/water quality testing, trench backfilling and provision of surface fittings to suit the

particular connection based on the allowable system isolation duration and the required times

for connection tasks.

Hydrostatically pressure test those portions of the connection pipework capable of being fully

pressure tested in accordance with Clause 19.4.2. If authorised by the Water Agency, test using

the currently available water supply operating pressure and ensure there are no leaks.

If a temporary alternative supply to customers has been provided, undertake water quality testing

of the isolated portion of the existing main and connection pipework in accordance with Clause

19.7. Do not put the existing main back into service until satisfactory water quality test results

are achieved.

Not used

22.4 Connection and/or Charging the New Water Mains


The Water Agency may permit the connection prior to confirmation of satisfactory bacteriological

testing, provided the new main can be isolated from the existing main by closing the valve at the

new tee.


of 54


Connect the new Works to the existing water supply system, if pre-installed connections were

provided. Following either direct connection or connection to pre-installed tees, and satisfactory

results from acceptance testing, give notice of intention to charge the new water mains, with the

supply to be provided from the existing water mains.

Following the installation and successful testing of the connection:

(a) Place embedment and support in accordance with Section 16 (refer to Drawing

WAT-1205-V).

(b) Backfill excavation in accordance with Section 17.

(c) Construct a shroud and install surface fittings in accordance with Design Drawings and

Drawing WAT-1301-V.

22.5 Reconnection of Properties Supplied by Temporary Private Services


Reconnect all properties supplied by a temporary private service to the appropriate closest point

of the new main and decommission the redundant portion of the water service. Provide any

existing properties that front the new main and are supplied by a temporary private service with

a new water service.

Relocate the existing water meters to the new water services and reconnect. Construct sufficient

pipework to reconnect the meter to the existing water service within the property in accordance

with AS/NZS 3500.1.

Refer to Drawings WAT-1106-V and WAT-1108-V.

Not used

23 Restoration

23.1 General Delete existing clause


The requirement to restore surfaces shall apply to construction by means of trenching, tunnelling

and/or boring.

Restore to pre-existing condition or to the requirements of the Water Agency and the Owner(s)

all surfaces, services and/or improvements disturbed, destroyed, removed or damaged during

construction of the Works and/or during installation of temporary Works such as access roads.

The Water Agency’s relationship with its customers may be significantly enhanced by providing

excellent service, particularly in the area of site restoration. Consequently, there is an

expectation that restoration should be to the highest standards.

The site shall be:

(a) Kept in a safe, clean and tidy manner during construction; unsightly items such as spoil

stockpiles and barricades shall be kept to a minimum; site debris and excess materials

shall be regularly cleaned up, removed and properly disposed.

(b) Restored progressively and as soon as possible; restoration work shall not be deferred.

(c) Left in a tidy and presentable condition.

As early as practicable, restore the site as near as practicable to its condition prior to construction

of the Works.

23.2 Pavements Delete existing clause


Some councils require approved contractors to carry out final reinstatement.

Immediately the filling of a trench excavation through a pavement has been completed, restore

the pavement to a trafficable condition. Where the initial restoration is of a temporary nature, use

a pre-mixed asphaltic material.

Immediately after filling a trench excavation through a pavement, restore the pavement to a

trafficable condition. Where the initial restoration is of a temporary nature, use a pre -mixed

asphaltic material.

Maintain temporary restoration until final restoration is carried out.

Complete the final restoration of bitumen and concrete pavements within one (1) month of

temporary restoration.

of 54


Maintain temporary restoration until final restoration is carried out. Carry out final restoration of

the pavement to restore both pavement and sub-base to no less than their pre-existing condition.

If appropriate, remove temporary restoration when carrying out final restoration work.

After their initial temporary restoration, maintain pavements of other than bitumen or concrete

with crushed metal, gravel or equivalent material, making due allowance for consolidation, and

then restore to a condition equivalent to that of the original pavement.

Complete the final restoration of bitumen and concrete pavements within one (1) month of

temporary restoration.

Observe Council requirements for reinstatement of road and footpath paving.

23.3 Lawns No change Reinstate lawns with turf sods cut and set aside from the original surface or with similar turf

imported for the purpose. To make up any deficiencies between the stripped quantity and the

quantity required for reinstatement, use imported topsoil consisting of a sandy loam of light to

medium texture, containing 5% to 10% by weight of humus, and free of weeds.

For areas to be turfed, ensure topsoil is graded to achieve a smooth surface, is free from lumps,

stones and other debris, conforms to finished levels, blends gradually into the adjoining

undisturbed ground and finishes flush with kerbs, footpaths and other paved surfaces.

Incorporate into the topsoil at the rate of 40 g/m² a fertiliser mix with a nominal

Nitrogen:Phosphorus:Potassium ratio of 10:4:6.

23.4 Grassed Areas No change For grassed areas that are not lawns, restore by replacing the pre-existing topsoil and

maintaining the disturbed area in a condition that will promote re-growth of pre-existing grasses.

Alternatively, replace pre-existing topsoil with clean topsoil and seed the affected area with grass

seeds or re-plant with runners of the varieties prevalent in the immediate area.

Should re-growth of grass fail to occur, repeat the process until re-growth is established.

23.5 Bushland No change Carry out all works in accordance with the requirements of the environmental Regulator.

Restore the works area as near as practicable to the pre-existing condition and leave the site in

such condition as will promote the rapid re-growth of native bush plant species prevalent in the

immediate vicinity.

Return stockpiled topsoil to its pre-construction location and place it in such a way that erosion

will be minimised, e.g. by the use of small contour banks.

Use pre-existing vegetation as a seed source where possible. Upon backfilling of the line and

spreading of topsoil, replace the pre-existing vegetation over the line, placing branches and logs

across slope to intercept runoff.

Do not use imported topsoil in native bushland areas.

Employ a qualified bush regenerator to control weeds for a period of two (2) years following

restoration.

Only local native species are to be used in revegetation of disturbed sites. On steep slopes, use

jute mesh and plantings to stabilise the soil.

23.6 Provision for and Rectification of Settlement


Conformance to the requirements of Clause 17 should prevent settlement over the trench and

any filled areas.

As necessary, place and compact additional fill over the trench and/or filled areas or trim the

original fill, so that the surface level of the completed trench conforms to the adjacent sur face.

Not used

of 54


Remove all surplus material and dispose of without breaching applicable regulations and laws.

Do not dispose of surplus on any property without the property owner’s written permission.

Subject to written consent of the owner, its agent or lessee, surplus material may be disposed of

by spreading neatly in the vicinity of the trench in such a way as to minimise further erosion of

the trenchfill and adjacent ground surfaces.

23.7 Maintenance of Restored Surfaces

No change Maintain all restored surfaces and improvements in a satisfactory condition until the end of the

defects liability period.

24 Work as Constructed Details


Prepare Work As Constructed drawings and documentation to the requirements of the Water

Agency. Refer to Hunter Water’s STS 911 Preparation of Civil and Structural Engineering

Drawings, STS 906 Operation and Maintenance Manual Requirements and STS 903 WAC

Information.

During progress of the work, record all required as-constructed details in the same format as the

Design Drawings. On completion of the work, provide the records to the Designer and assist as

appropriate with preparation of Work As Constructed drawings. Keep a copy of all as -constructed

records.

Not used

wsa 03-2002 water supply code of australia (hunter water edition ...€¦ · wsa 03-2002 water...

Documents