4878 Horizontal Directional Drilling and Thrust / Auger Boring

REVISION 05/02/21

4878.1 Introduction This supplementary specification relates to the minimum deliverables and standards that need to be achieved when performing trenchless construction works (Horizontal Directional Drilling (HDD) & Thrust/Auger Boring (TB) related to Mackay Regional Council (MRC) assets.

The intent of this supplementary specification is not to replace MRS & MRTS 140 and MRS & MRTS 142 but must be read in conjunction with these specifications for MRC-specific requirements, additional to those outlined by Main Roads.

Its purpose of this specification is to ensure that the safety, quality, environmental and design objectives required by the MRC are achieved.

4878.2 Referenced Documents This supplementary specification shall be read in conjunction with the following:

• Environmental Protection Act and Policies

• AS 1554 “Structural Steel Welding”

• AS 1726 “Geotechnical Investigations”

• AS 2868 “Confined Spaces”

• AS 4058 “Precast Concrete Pipes”

• AS 4100 “Steel Structures”

• AS 1477 “PVC pipes and fittings for pressure applications”

• AS 2033 “Installation of Polyethylene Pipelines”

• AS 2885 “Gas and Liquid petroleum”

• AS 4130 “Polyethylene pipes (PE) for pressure applications”

• AS 4765 “Modified PVC (PVC-M) for pressure applications”

• ASME B36 “Welded and seamless wrought steel pipe”

• MRTS01 “Introduction to Technical Specifications”

• MRTS01 “Introduction to Technical Specifications”

• MRTS03 “Drainage, Retaining Structures and Protective Treatments”

• MRTS04 “General Earthworks”

• MRTS16 “General Requirements Landscape and Revegetation Works”

• MRTS25 “Steel Reinforced Precast Concrete Pipes”

• MRTS50 “Specific Quality System Requirements”

• MRTS51 “Environmental Management “

• MRTS52 “Erosion and Sediment Control”

• MRTS63 “Cast-In-Place Piles”

• MRTS70 “Concrete”

• MRTS78 “Fabrication of Structural Steelwork”

• MRTS91 “Conduits and Pits”

• MRTS140 “Horizontal Directional Drilling (HDD)”

• MRTS142 “Thrust Boring and Auger Boring”

• MUTCD “Queensland Manual of Uniform Traffic Control Devices”

• QGTTM “Queensland Guide to Temporary Traffic Management “

• AGTTM “Austroads Guide to Temporary Traffic Management”

• Standard Drawing 1178 “Diversion of Water – Diversion of Water from Roadway and Table Drains

• NASTT “HDD Good Practices Guidelines”

• Work Health and Safety Act 2011 (Qld);

• Work Health and Safety Regulation 2011 (Qld);

• Water Supply (Safety and Reliability) Act 2008 (Qld);

• Environmental Protection Act 1994 (Qld);

• Queensland Building Services Authority Act 1991;

• Professional Engineers Act 2002;

• Workplace Health and Safety Queensland, Confined Space Code of Practice 2011;

• Workplace Health and Safety Queensland, Scaffolding Code of Practice 2009.

• Australasian Society for Trenchless Technology (ASTT), (2010). Guidelines for Horizontal Directional Drilling, Pipe Bursting, Microtunnelling and Pipe Jacking, Rev 1, February 2010;

• North American Society for Trenchless Technology (NASTT), Horizontal Directional Drilling Good Practices, 4th Edition;

• Pipe Jacking Association (UK), Guide to Best Practice for the Installation of Pipe jacks and Microtunnels (1995) and;

• the Project Drawings

4878.3 Description of Work Items The following work items are covered by this supplementary specification:

Task Item No. Description Unit of

Measurement

Horizontal Directional Drilling (HDD) – MRS140

4878 Design of HDD installation system Lump sum

4886 Operation of HDD machine Lump sum

4887 Designer’s inspection and certification Lump sum

Thrust Boring and Auger Boring – MRS142

4898 Design of thrust / auger boring installation system Lump sum

4904 Grouting outer annulus and space between the casing and carrier pipe

m3

4906 Operation of thrust / auger boring machine Lump sum

4907 Designer’s inspection and certification Lump sum

4878.4 Work Operations

Work operations incorporated in these items include:

a) Work Operations included in Clause 2.1.5 of MRS01 “Introduction to Specifications”;

b) Delivery of project standards generally in accordance with MRTS 140 & MRTS 142;

c) Supply of all materials;

d) Maintenance of the worksite, existing facilities and services;

e) Vibration and noise monitoring (if required);

f) Locate and identify all services within the project site;

g) Site establishment (provision of access and working platform if required);

h) Establishment of appropriate barricades and traffic management equipment to ensure the safety of

the operating traffic, pedestrians and observers are taken into consideration prior to commencement

of excavation;

i) Excavating entry and exit pits including, setting out thrust and receiving pits as per approved

Standard Drawings, ensuring that the location is free of obstruction and services;

j) Survey and set out of critical points including alignment, property boundaries and utilities including

horizontal and vertical set out at critical locations;

k) Prior to work commencement, level control points shall be established to keep level monitoring

during thrust bore operation;

l) The carrier pipe or conduits shall be installed through the casing by suitable means. Where the

carrier pipe must be installed to a certain grade suitable, strapping to the pipe to help maintain grade

shall be considered;

m) Welding/jointing of pipes (enveloper and/or carrier pipe);

n) Lifting plan;

o) Equipment operation;

p) Removal and disposal of all spoil off site or as directed by the Administrator;

q) Monitoring of the HDD alignment (see Clauses 5.4 and 7.7);

r) Operation of a steering system to achieve the design alignment;

s) Use and management of drilling fluids, lubricants, cementitious grouts or other consumables,

including relevant environmental and disposal information;

t) Annulus grouting procedures;

u) Demobilisation of the equipment;

v) Landscaping, revegetation and reinstatement of the site following completion of the works;

w) Once the installed pipe work is connected to existing or new infrastructure, both the entry and exit

can be backfilled with approved fill materials, compacted and reinstated;

x) Reinstatement of the site; and

y) Providing As constructed and Quality Assurance documentation prior to payment for the item.

4878.5 Definitions

Horizontal Directional Drilling

Horizontal Directional Drilling (HDD) shall be defined as a trenchless construction method for

installing conduits or pipelines which incorporates the following features:

• Pilot hole is drilled (usually from the surface), along the design alignments using a steerable and

trackable drill;

• The hole is reamed to the required diameter in one or more passes;

• The drilled hole is continuously stabilised by use of a bentonite, polymer or mixed metal oxide

drilling fluid;

• The product pipe is pulled into the reamed-out borehole;

• For purposes of installing a non-gravity pipeline under structures or geological features without

surface disturbance;

• The HDD vertical alignment usually traverses at an entry angle of 8 to 20 degrees below the horizontal into

the ground then a curve to transition to the horizontal, another curve to transition to an angle between 8 to

25 degrees below the horizontal at the exit side.

Auger/Thrust Boring

Auger/Thrust Boring shall be defined as a trenchless construction method for installing pipelines

which incorporates the following features:

• Forming a bore from a launch or drive pit / shaft to a reception pit / shaft by means of a rotating

cutterhead;

• Borehole is supported by a temporary steel / concrete casing at all times;

• Spoil is removed back to the drive shaft by helically wound auger flights rotating in a steel casing;

• The equipment has limited steering ability;

• For purpose of installing a pipeline under structures or geological features without surface

disturbance;

• The horizontal alignment is usually straight, and the vertical alignment is usually level (or with a

slight grade of 0 to 3 degrees).

4878.6 Project Preliminaries

4878.6.1 Approvals

No work activities, on site preparation or boring activities shall begin, until all relevant permits and

approvals have been gained and signed off by the relevant authority. The following authorities may be

required to authorise the works:

• Mackay Regional Council;

• Transport and Main Roads;

• Queensland Rail / Aurizon

• Asset Owner (i.e Telstra, Ergon)

• Private land owners.

The Contractor shall be required to adhere to any approval conditions that the authority specifies.

4878.6.2 Submittals

Prior to works commencing on site Council requires the following documents to be submitted for review

and acceptance.

• Approved Traffic Management Plan;

• Approved Environmental Management Plan

• Evidence that location of existing services has been carried out;

• Site layout drawings;

• Pre-Dilapidation Report (Refer Section 9.3);

• Methodology and QA ITP;

• SWMS;

• Contingency plans;

• Temporary works design.

Post completion of the works Council requires the following documents to be submitted for review and

acceptance:

• Post-Dilapidation Report; and

• QA ITP and As Constructed Records.

4878.7 Design

The Contractor shall be responsible for the construction of all aspects of the boring works including

any temporary works and temporary supporting structures to the approved design. All assumptions

regarding subsurface conditions, equipment requirements, groundwater and other factors are the

responsibility of the Contractor and shall be taken into account when performing the works.

All Temporary and permanent works designs need to be certified by a RPEQ engineer.

Initial project concept plans shall be provided as part of the Project Plans and shall typically be

represented similarly to sketches following but for HDD be based on 18o entry and exit angles.

Determination of final designs shall be subject to site investigation to determine conflicting utility

conflicts and geotechnical assessments but will be subject to standard conditions shown in Appendix

A as well as site specific conditions shown on project plans.

The design must be also in accordance with Section 5.2, MRTS140 for HDD works and Section 6.2

MRTS142 for Thrust Boring / Auger works.

Below are indicative HDD and Thrust Boring/Auger plans that demonstrate the design requirements

for the works.

4878.7.1 Risk Assessment and Control

The Contractor is to prepare and implement an approved contingency plan dealing with the key boring risks. As a minimum the Contractor is to have defined plans complete with equipment and materials on standby to mitigate against the following HDD/Auger boring risks:

4878.7.1.1 HDD

• Fluid loss;

• A hydrofracture event;

• Hydro-lock (loss of fluid circulation);

• Hole collapse;

• Fluid pit overflow;

• Hydrocarbon spill;

• Drill pipe or Bottom Hole Assembly failure;

• Settlement or heave scenarios;

• Serious safety (e.g. service strike or overhead powerline strike) or environment incidents.

4878.7.1.2 Thrust/Auger Boring

• Shaft/pit collapse;

• Face/bore collapse;

• Shaft/pit flooding;

• Auger bore flooding;

• Working in proximity of suspended loads;

• Major equipment mechanical failure;

• Settlement or heave scenarios;

• Serious safety (e.g. machine roll over, service strike or overhead powerline strike) or environment

incidents;

• Higher jacking (thrust) forces than expected.

The risk assessment provided to Council must be also in accordance with Section 5.4 MRTS140 for

HDD works and Section 6.4 MRTS142 for Thrust Boring / Auger works.

4878.7.2 Geotechnical Information and Risk

The Contractor shall inspect and review the ground condition to ensure it is safe to perform the under

boring activity. The Contractor is responsible for all testing and preparation required to perform this

investigation. Works shall be carried out by experienced personnel with an extensive background in

this field. The contractor is responsible for all affects resulted from this activity.

4878.8 Procurement

4878.8.1 Storage and Security of Materials

The Contractor is to provide security for the Site and Works including the construction facilities, plant

and equipment. Materials shall also be secured by the Contractor to prevent their removal by

unauthorised personnel.

4878.8.2 Materials

The Contractor is to ensure that chemicals and hydrocarbons are used according to MPC’s or 3rd Party

Asset Owners accepted environmental practises complete with control measures to mitigate risk.

The Contractor is to ensure that the drilling fluids and chemicals that have the potential to come into

contact with the ground are biodegradable, safe to water bodies and fire resistant.

4878.8.3 Personnel

Appropriately trained and experienced personnel are required for the delivery of the works. Table 1

below summarises the minimum training and experience required for key personnel.

Table 1 - Key HDD Personnel Training and Experience

HDD Role VOC Training /

Qualification

Experience in Role

(Years) Time on Site

HDD Supervisor Rig and fluid training 5 50 – 100%

HDD Steerer Survey equipment training

5 As Required

HDD Driller Rig and fluid training 3 100%

HDD Offsider Fluid training / Bore tracking

1 100%

Auger Bore Supervisor Rig and pit training 5 50 – 100%

Auger Bore Operator Rig and pit training 3 100%

4878.8.4 Plant

All trenchless construction operations shall be performed using specialist equipment.

All plant must be of a good standard and comply with the following criterion as listed below:

• Plant is required to be in good safe working order;

• Plant is required to have a good service history;

• Plant is required to be fit for purpose.

The Contractor’s management plans must detail a system for daily checking and resolving of issues

with the supplied plant and equipment.

For HDD methods as a minimum the Contractor is to supply the following plant:

• HDD drill rig adequately sized for the length and diameter of the bore;

• Cable strike detection system (or a comprehensive risk assessment removing its requirement);

• Drilling Fluid mixing system;

• Drilling fluid pump sufficient for annulus size;

• Fit for purpose lifting machine for drill rod and pipes;

• A separation system (If required).

For Auger boring methods as a minimum the Contractor is to supply the following plant:

• Augerbore machine with cutting head;

• Cable strike detection system (or a comprehensive risk assessment removing its requirement);

• Flight augers;

• Jacking frame;

• Hydraulic power pack;

• Fit for purpose pit / shaft support complete with design;

• Fit for purpose lifting machine for Auger Boring machine and pipes;

4878.8.5 Lifting Plant

Lifting plant is to be appropriately employed by the Contractor. The Contractor is to ensure that

experienced personnel with the required certificate of competency operate the lifting equipment at all

times. All crane operation is to be in accordance to AS 2550 Cranes, hoists and winches Safe Use.

In the case where the Contractor chooses to use an excavator to lift plant and materials the hydraulic

cylinders must be fitted with burst protection valves to the Australian Standard: AS 1418 Cranes, Hoists

and Winches.

4878.9 Project Execution

The Contractor shall maintain control of site operations at all times. The Contractor has ultimate

responsibility for site safety, the environment, quality workmanship and the satisfactory completion of

the work as authorised under the Contract with the 3rd party service provider.

4878.9.1 Site Setup

The Contractor is to set the drill entry and exit sites up in accordance with the approved site layout

drawings which as a minimum must cover the following key aspects:

• Temporary access;

• Perimeter fencing in the allowed location;

• Site topsoil stockpile complete with erosion and sediment control;

• Entry and exit points;

• Pedestrian walkways and appropriate exclusion zones around cranes or moving plant;

• Equipment locations and movement zones;

• Any underground or overhead power lines and the appropriate exclusion zone;

• Shaft / pit locations;

• Traffic guidance systems.

• Survey and set out of critical points including alignment, property boundaries and utilities including horizontal and vertical set out at critical locations.

4878.9.2 Existing services

All existing services shall be located prior to works commencing by a person having qualification for

this type of work. A combination of above ground location and potholing techniques shall be utilised

as required.

4878.9.3 Dilapidation Reports

The Contractor shall ensure that the condition of any Council assets is not affected by the performance

of the Underboring works. Records of pre and post construction condition shall be recorded. and any

damage identified to council assets shall be made good at the Contractor’s expense.

4878.9.4 Monitoring and Reporting

The Contractor shall maintain adequate records to provide council evidence that the works have been

carried out to the approved design.

4878.9.5 General Earthworks

General earthworks requirements shall conform to the requirements of the Project Specification for

Civil and Earth Works.

As a minimum all excavations will be backfilled and compacted to 95% Standard Compaction

(AS1289.5). Landscaping will be restored to its original condition. At the end of the works, temporary

shaft(s), pit(s) and all other temporary structures are to be removed (unless there is an agreement

otherwise). All spoil, slurry and drilling fluids shall be disposed of by the Contractor in accordance with

current industry legislation.

4878.9.6 Settlement/Heave

If the boring works are under a critical council asset (i.e. roadway, pedestrian pathway, concrete

hardstand etc.) prior to commencing any boring works existing levels shall be recorded along the

design bore alignment. Once the bore has been completed a further survey of the existing surface

levels along the bore shall be performed to provide evidence to the council that any ground surface

settlement or heave is within acceptable tolerances.

4878.9.7 HDD Drilling and Pipe Installation

4878.9.7.1 Drilling Water

The Contractor shall be responsible for the supply, transport and storing of water required for drilling

and hydrostatic testing (if required).

4878.9.7.2 Pipe Welding and Jointing - General

Butt welds are to be used for all pipe joints of all pipe materials that are pulled through the HDD

alignment. Other methods of jointing including electrofusion, clamped or proprietary bell/spigot type

joints are not permitted without written approval from the Authority/Asset Owner.

4878.9.7.3 Pipe Welding and Jointing – HDPE Pipe

HDPE Butt Fusion welding, carried out in accordance with AS2033, is to be conducted only by suitably

trained and experienced operators with current welding certification (e.g. qualified to PMBWELD301B).

4878.9.7.4 Drilling Fluid Management

The Contractor is to use drilling fluid to efficiently support the borehole and carry the cuttings away in

solution to the surface.

The drilling fluid and any additives shall be environmentally friendly.

All chemical fluid additives are to be inert to the environment and the Contractor is to maintain an up

to date chemical register and have SDS documents available onsite.

In the event that a drilling fluid hydrofracture occurs, the Contractor shall cease drilling and notify

the .Authority/Asset Owner.

The Contractor shall have a contingency plan in place in the advent that a hydrofracture of drilling fluid

occurs. The contingency plan shall address the following:

• Responsibilities;

• Monitoring;

• Emergency response procedures;

• Equipment available for containment control and clean up;

• Proposed methods for clean-up;

• Procedure for continuation of drilling.

Drilling fluids and drill spoils shall be disposed off-site to an approved location. Details of the nominated

disposal site are to the submitted to the superintendent’s Representative for approval.

All relevant legislation shall be adhered to.

4878.9.7.5 Drilling, Reaming, Conditioning

The Contractor will incrementally perform drilling tasks to prepare the bore hole for the pipe pull. The

process should follow the following stages:

• Drill and steer the pilot hole along the approved alignment;

• Ream the pilot hole out to the specified diameter per the Contractor’s design and guide shown

in Table 2;

• Condition and clean the borehole until the Contractor is satisfied that the hole is clean and ready

for the pipe and/or conduit pull (i.e. reduce issues with pipes/conduits getting stuck and/or

possibility of ground heave.

4878.9.7.6 Bottom Hole Assembly (BHA)

The Contractor must use fit for purpose downhole equipment. The equipment must be supported by the manufacturers or local agents. All downhole equipment must be accompanied with service records/reports and proofs that it is in good working order and any threaded joints are torqued to the appropriate makeup torque. Pulling heads and swivels shall be designed to the maximum operating drill rig tensile load with an appropriate factor of safety. This is to ensure the risk of breakages and tooling getting stuck under roadways is minimal.

4878.9.7.7 Pilot Hole

In the event that the pilot does deviate from the bore path by more than the requirements of Table 3

the Contractor shall notify the Authority and MPC and either may require the Contractor to pull-back

and re-drill from a location along the bore path prior to the deviation.

Drill bits are to be in good working order and appropriate to the ground conditions indicated.

4878.9.7.8 Reaming

Upon successful completion of pilot hole (in accordance with the design alignment), the Contractor (if

required) shall ream the bore hole, using the appropriate HDD tooling, to a size recommended by Table

2 below. Reaming tools are to be in good working order and appropriate to the ground conditions

indicated.

Table 2 - Product Diameter and Reamed Diameter Recommended Relationship (NASTT 2008)

Attribute Included information

< 8” (<200mm) Diameter of product/conduit bundle+ 4”

(100mm)

8”- 24” (200-600mm) Diameter of product/conduit bundle x 1.5

>24” (>600mm) Diameter of product/conduit bundle + 12” (300mm)

4878.9.7.9 Pipe Pullback

At the completion of the hole opening and the hole conditioning the Contractor will commence the pipe/conduit pullback. The pullback is a critical operation and the following must be controlled by the Contractor:

• If the Contractor needs to work continuously during this operation, then the Contractor is to seek

extended working hours in accordance council requirements. Appropriate lighting will need to be

provided;

• Measures need to be taken to ensure that the pipe/conduits are not damaged during pullback

such as the use of pipe rollers / sandbags if required;

• The Contractor is to plan for the handling, storage and disposal of the displaced drilling fluid

during pipe pullback so as not to delay the operation.

In the event that the pipe becomes stuck, the Contractor will cease pulling operations to allow any potential hydro-lock to subside and will then recommence pulling operations. If the pipe remains stuck, the Contractor will notify the Authority and Council.

4878.9.7.10 Grouting

In conjunction with the Principal the Contractor is to determine if annulus grouting is required. In determining if grouting is required the following elements must be assessed:

• Surface settlement;

• Pipe buckling from ground and hydrostatic loads;

• Drill path erosion and drainage;

• Resistivity;

• Heat transfer;

• Permanent operation.

In the case that the HDD requires the annulus between the casing pipe and the carrier pipe to be grouted the Contractor is to provide a procedure for approval to Council. A cementitious material should be used, and the grouting pressure should not exceed the P max and any pressure limitation of the carrier pipe.

4878.9.7.11 Survey

4878.9.7.11.1 Borehole Alignment

The Contractor shall adopt an accepted survey methodology (e.g. walkover guidance) to guide the

borehole along the designed alignment.

At least one (1) reading per drill rod is required during the drilling of the pilot hole, registering inclination,

heading, length, depth and the orientation of the bent sub. This information is to be recorded on the

steering log and be available for inspection of a council representative as and when required.

Alignment changes can only occur with Principal approval.

4878.9.7.11.2 Borehole Cross section

The Contractor shall include all details of depths as part of the As Constructed details submission.

4878.9.8 Thrust/Auger Boring and Pipe Installation

4878.9.8.1 Excavation

During the boring operation, elevation and alignment of the steel casing pipe shall be regularly monitored to ensure the correct line and level is maintained.

If it is determined that the bore alignment is offline beyond the permissible tolerance, then boring activities shall cease and only recommence once rectification steps have taken place.

The following steps may be implemented:

• Adjust machine/auger alignment via machine/rail mount adjusters;

• Pullback and realign auger;

• Pullback and realign boring machine and or railings;

• Abandon and start new bore.

To avoid ground loss during boring operations, the Contractor will implement the following:

• Boring machine operator will ensure that the rate of forward progress of the auger is comparable to the amount of spoil discharged by the auger;

• Boring machine mountings to be checked to ensure that vibration(s) are kept to a minimum during boring operations;

• Only suitably experienced personnel will be involved in boring activities;

• Employ a means of pressurising the bore on the machine (cuttings discharge door).

The bore will be continuously cleaned by rotating the auger and spoil removed from the pit/shaft by a suitable excavator during the installation of the enveloper pipe.

The enveloper pipe shall be installed as per the design drawings and shall conform to the construction tolerances as shown in Table 3.

4878.9.8.2 Outer Annulus Grouting

To ensure the possibility of surface settlement over time, the alignment of the bore is kept to a minimum. The outer annulus between the steel casing and the excavated borehole shall be grouting up as soon as practically possible after completion of the casing installation.

The grout shall be a minimum 1 MPa mix, which with historical and actual NATA laboratory testing available to confirm that it complies with this requirement. The grout mix design and pumping equipment shall be suitably matched to ensure complete filling of the annulus without issues onsite.

Records of actual vs theoretical volumes shall be kept and supplied to the Council as part of the as-built documentation to verify that this annulus has been grouted successfully.

The grouting shall be undertaken generally following the sequence of:

• The tunnel openings (eye) will be adequately sealed to ensure a complete seal between the ground and enveloper pipe;

• A breather hole will be left in the crown at the uphill end to allow air to escape and to provide visual confirmation that the void is full;

• Grouting will continue until the grouting operation achieves any of the following conditions: o Grout is visible from the breather hole; o The quantity of grout injected into the annulus equals the theoretical volume of the

annulus; o The pressure that the grout is injected at is 0.25 bar greater than the theoretical

hydrostatic ground pressure.

4878.9.8.3 Carrier Pipe Installation

Carrier pipe installation will be undertaken as a separate operation upon completion of the auger boring/bored and jacked pipe crossing works.

Generally, the Contractor shall install the pipes in pretested lengths utilising an excavator, crane or other suitable lifting equipment. The carrier pipe shall be centralised in the bore using casing spacers at a minimum of 1.5m intervals or as specified by the manufacturer to support the weight of the pipe.

4878.9.8.4 Grouting of Inner Annulus

Once the carrier pipe is installed, centred, continuity tested (if required) and hydrostatically tested (if required), the Contractor shall grout the inner annulus of the enveloper pipe.

The grout shall a minimum 1 MPa mix, which with historical and actual NATA laboratory testing available to confirm that it complies with this requirement. The grout mix design and pumping equipment shall be suitably matched to ensure complete filling of the annulus without issues onsite

The gap between the enveloper pipe and the carrier shall be sealed at each end of the enveloper pipe. A breather pipe shall be installed at each end with the end of the pipe at least 1 m above the lowest obvert of the pipe.

Grouting shall commence from the downhill end of the pipe.

Grout shall be added into the void, under gravity pressure or by pump, through the pipe until grout is visible and bleed water is expelled from the breather pipe at the upper end.

Records of actual vs theoretical volumes shall be kept and supplied to the council as part of the as-built documentation to verify that this annulus has been grouted successfully.

4878.9.8.5 Drilling Water

The contractor shall be responsible for the supply, transport and storing of water required for drilling

and hydrostatic testing (If required).

4878.9.8.6 Survey

4878.9.8.6.1 Borehole Alignment

With Auger/Thrust boring there is generally some ability to control the vertical alignment, dependent

on the contractor’s setup, however the control of the horizontal alignment is entirely dependent on the

set up of the casing on the right alignment in the launch pit.

Once the auger and casing progresses beyond the face of the launch pit a water level arrangement

can be utilised to monitor vertical position, however horizontal alignment is not able to be tracked until

the auger head and casing enters the reception pit.

At least one (1) water level reading per metre is required during augering and installation of the casing.

This information is to be recorded on a steering log and be available for inspection of a council

representative as and when required.

Alignment changes can only occur with Principal approval.

4878.9.8.6.2 Borehole Cross section

The Contractor shall include all details of depths as part of the As Constructed details submission.

4878.10 Alignment Tolerances

The bore path must follow the approved designed alignment and conform to the allowable tolerances depicted in Table 3 below. Table 3 - Boring Tolerances

Boring Alignment

Tolerance Allowable Deviation

Horizontal from Designed Alignment +- 500mm

Vertical from Designed Alignment +- 500mm

Gradient (including entry angle and exit angle) +- 1%

Horizontal Tolerance from Planned Surface Exit (Both

perpendicular and longitudinally)

1m

4878.11 As Constructed documentation

Prior to works being completed on site an as-built drawing of each bore shall be prepared, certified as

to their accuracy and submitted by the Contractor to the council to provide evidence that the bore has

followed the approved design within the council’s accepted tolerances (Refer Table 3).

The Contractor shall provide this documentation within 10 calendar days of completing the work.

The Contractor shall ensure that the plans are dimensionally correct copies of the Contract plans and

include roadway plans and profiles, cross-sections, boring locations and subsurface conditions. The

plans must show appropriate elevations in terms of meters above/below Australian Height Datum

(mAHD). As Constructed plans shall be submitted in electronic and hard copy form as specified in the

MRC ‘ Drawings and Documentation Guidelines’

https://www.mackay.qld.gov.au/__data/assets/pdf_file/0005/13964/D20.pdf.

The Contractor shall include bore notes on each plan stating the final bore path diameter, product

diameter, composition of any other materials used to fill the annular void between the bore path and

the product, or facility placed out of service. If the product is a casing, the size and type of carrier pipe

placed within the casing shall be recorded as part of the work.

4878.12 Restoration and Demobilisation

Once works are complete the site is to be restored back to its original condition prior to works

commencing and all plant, equipment, excess materials and drill spoils are to be removed from site.

A post-construction dilapidation survey is to be carried. This assessment shall be a means of

determining whether and to what extent, damage has resulted from the Contractor’s operations during

the Works.

4878.13 Project Completion and Handover

The Contractor is to submit the As Constructed package in hard copy and electronic format as indicated

above.

The Contractor shall keep records of all trenchless operations and all such data shall be available for

inspection of the council (if required). These records will form part of the As Constructed data.

The Contractor is required to submit As Constructed records in a format that clearly shows the position

of the bore alignment both in plan and elevation. The Contractor must also submit Red Line Drawings

detailing all relevant As Constructed records.

The Council shall review these records before accepting the works.

4878.14 Council Representation

The Contractor must allow access to representatives of the council to inspect the progress of the works

at any time to ensure the particular requirements of the council are being met.

4878.15 Measurement and Payment Provision for the work operations listed in 4878.3 for Horizontal Directional Drilling and Thrust/Auger Boring shall be costed at the units referenced. The rates shown are fully encompassing for all of the work items referenced in this specification and the referenced MRTS specifications.

Version Control:

Version Description Reviewed / Endorsed Date

1.0 Original issue MRC 05/02/2021

Appendix A

STANDARD CONDITIONS FOR THE INSTALLATION OF SERVICES WITHIN ROAD RESERVES

STANDARD CONDITIONS FOR THE INSTALLATION OF SERVICES WITHIN THE BOUNDARIES OF COUNCIL CONTROLLED ROADS / LANDS (As per LL1 – Administration and SLL 1.1 – Alteration or Improvement to LG Controlled Areas and Roads)

1.0 General 1.1 The work approved shall be limited to the locations shown on the application plans submitted to Council. 1.2 Service alignments shall be in accordance with that specified on Standard Drawings A3-882 to A3-890 and A3-897

for Urban Roads and A3-891 to A3-896 for Rural Roads. 1.3 If new alignments are being proposed, no services are to be placed within the existing roadway / street works

formation width. Services are to be located clear of and on the boundary of existing structures (eg. Culvert Endwalls). 1.4 The work shall proceed without any unreasonable interruption of traffic and any steps necessary for the protection

of the Public shall be undertaken. This shall include the provision of adequate warning signs, devices and traffic control in accordance with the Manual of Uniform Traffic Control Devices, as well as adherence to any Workplace Health & Safety legislative requirements.

1.5 The road reserve is to be returned to a neat finish, and similar to finish pre-existing the service being placed. The

Applicant/Contractor/Authority/Carrier shall be required to repair, at his own expense, any damage to the road / road reserve due to the existence of the service. With boring operations across road/street formations, a minimum clearance of 1000 mm is required at the existing road crown.

1.6 All crossings under sealed roads and concrete, paved or sealed driveways and footpaths shall be bored, unless

otherwise approved.

o Concrete footpath shall be restored in accordance with plans A2-500 or A3-989, dependent on location. o The minimum dimension of any remaining slab shall not be less than 1.5 metres in any direction. o Feature driveways shall have the full slab replaced to the property boundary in existing colour and pattern. o Kerb & Channel shall be restored in accordance with Plan A3-865. o Pram ramps shall be replaced in their entirety and are to comply with Council’s standard drawing. o Invert crossings shall be replaced in their entirety and are to comply with Council’s standard drawing A3-

773. o Asphalt paths shall be broken out to a minimum of 300 mm on each side of the trench and backfilled with

compacted stabilised sand, crusher dust or crushed rock pavement material, finished with a minimum of 25 mm thickness of compacted asphalt.

Where trenching across roadways is approved by Council, reinstatement shall be in accordance with details shown on Council’s Standard Drawing A3-898.

1.7 It is the applicant’s responsibility to verify the existence and location of any underground services which may be

affected by the proposed work including, but not limited to, Telecommunication lines, Electrical cabling, Sewerage mains, Water mains, Drainage and Irrigation pipes. If such Council services exist the applicant is to liaise with the Mackay Regional Council to prevent any damage to such service. In addition, separation distances specified by relevant industry code is as well as policy MW16 are to be maintained as a minimum.

1.8 If specified, provision should be made for future extension of a service to avoid subsequent disruption of traffic and

damage to road pavements. 1.9 The cost of all work, including the restoration of the road reserve to a clean and tidy condition acceptable to Mackay

Regional Council as specified above in clause 1.5, shall be the responsibility of the owner. 1.10 The applicant, by accepting the above conditions, hereby indemnifies the Mackay Regional Council against any

claim, action or process for damage and/or injury which may arise during the progress of the work and shall keep indemnified the Mackay Regional Council against any claim, action or process for damage and/or injury which may arise from existence of the service.

1.11 The installation shall in no way interfere with the work of maintenance or construction personnel of the Mackay

Regional Council. 1.12 If the proposed works involved access through or require the use of private lands, permission of the local landowner

is to be sought prior to the commencement of these works.

2.0 Electrical Infrastructure 2.1 All conduits/cabling under constructed bitumen or asphalt-surfaced roads are to be bored unless specifically

approved in writing by Council under exceptional circumstances. Only roads with gravel surfaces may be trenched. Road crossings should be at 90 degrees to the road centreline wherever possible.

2.2 Trenching and reinstatement is to be in accordance with Council’s Standard Drawing A3-898. 2.3 All electrical infrastructure is to be constructed within the standard electrical alignments as shown on drawings A3-

882 to A3-890 and A3-897 for Urban Roads and A3-891 to A3-896 for Rural Roads. 2.4 Kerb markers are to be provided where underground installations cross under kerbs. 2.5 A minimum cover of 1000 mm is to be provided to all conduits within the trafficable areas of the road reserve. This

cover is to be measured from the lowest of the following points:-

Adjacent kerb level Adjacent road shoulder level Existing surface level above the conduits.

2.6 These minimum cover requirements are to be maintained under table drains and open drains. 2.7 Pad mount transformers or similar cabinets are not to be located within a footpath area unless specific Council

approval is obtained. Council’s preferred location for these facilities, in developed areas, is set back from the road reserve boundary either in parks or additional road reserve allocation. This may require liaison with developers and/or Queensland Department Environment Reserve Management prior to submitting proposal to Council. Transformer slabs shall be set at such a level so as to not create a trip hazard.

2.8 Minimum clearances as required by Australian Standards are to be maintained to overhead lines. 2.9 Traffic control is to be provided and maintained in accordance with Queensland Transport & Main Roads’ ‘Manual of

Uniform Traffic Control Devices’. 2.10 All works within the boundaries of Declared Main Roads are to be approved by Queensland Department of Transport

& Main Roads. 2.11 The contractor is to obtain current details of Council’s services from Council. Any damage to Council’s services will

be repaired at the contractor’s cost. 2.12 Council’s ‘As Constructed’ data shows mains reticulation only. Service conduits may also be encountered during

construction and these should be identified prior to excavating. Repairs to any damage to these services will be the responsibility of the contractor.

2.13 Satisfactory sediment and erosion controls are to be installed and maintained in accordance with Institute of

Engineers Guidelines. 2.14 If existing concrete pathways need to be modified or cut, full width panels of pathway between existing joints are to

be removed and reinstated. Should sections of driveways/pathways be removed, the reinstatement shall include the installation of 16 mm diameter x 400 mm long dowels at 20 mm centres to the cut face. Any pathways that need to be removed shall be replaced in their entirety and no paths are to be cut longitudinally in half of part thereof.

2.15 Any new poles installed should be frangible type. 2.16 At stream locations, Council would prefer that the Energy Authority remain on correct alignment. Where services are

attached through or to the outside of existing culverts, bridges or floodway structures at the convenience to the Energy Authority, the Energy Authority shall indemnify Council against all future relocation costs should the culvert, bridge or floodway require to be reconstructed, widened or replaced.

Where conduit provisions (or service ducts) are made within new bridge structures it shall be the bridge owners responsibility to bear relocation costs in the future, should the bridge be widened or reconstructed.

2.17 Tree Removal

(a) Rural Areas – The removal of any trees greater than 200 mm diameter or clearing greater than 500 m2 must be approved separately by Council. The submission should include photographs of the

site, statement of environmental effects and any environmental controls proposed.

(b) Urban Areas – The removal of any tree must be approved separately by Council. The submission must include photographs of each individual tree identified for removal. Any approval shall be subject to the following conditions.

• All debris associated with the work is to be removed from the site.

• The stump is to be ground below the level of the nature strip and backfilled to original level of the nature strip.

• No other vegetation is to be damaged.

• A replacement street tree shall be planted and maintained to establishment for each tree removed.

• Footpath to be left in a clean, tidy and safe condition.

2.18 Tree pruning shall comply with Australian Standard AS 4373 – 2007 Pruning of Amenity Trees. 2.19 All areas that are disturbed by the operations are to be restored to the original conditions which will include, but not

be limited to, levelling, compaction to prevent future sinking, top soiling and turf (or seed with a compatible grass seed mixture in rural areas).

2.20 Aerial cable crossings or roads must achieve a minimum clearance of 5.5 m above the entire trafficked roadway. 2.21 Where the proposed works requires trenching through turf, destruction of vegetation, cutting of driveways,

construction of pillars, pits or poles fronting private property, Council recommends the Energy Authority consult with the affected property owner.

2.22 The Energy Authority / Contactor shall provide As Constructed details of non-standard alignments to Council and

Council shall keep a record of all non-standard alignments granted. 2.23 Contact Council’s representative / inspector to arrange for inspection of the completed works by Council. 2.24 Location of utility services on Council-owned infrastructure such as culverts, bridges, boardwalks and water towers

or on land owned by or under Council control will not be permitted unless:-

(i) The relevant service authority has indemnified Council against future costs of relocation. (ii) Works are undertaken at no cost to Council. (iii) Where a second party wishes to attach services to a Council owned bridge or culvert, Council’s

requirements regarding location, design and maintenance are to be met. (iv) Ducting shall generally be galvanised steel tubing and mounted in brackets on the outside of the

downstream deck / kerb unit. Brackets shall be hot dip galvanised and fastened using stainless steel fasteners into the ferrules cast into the outside of the units.

(v) Where ferrules do not exist, approval shall be sought from Council to use Stainless Steel Chemset (epoxy type) anchors. It is method is required, care will be required not to damage the reinforcement of the structure when masonry drilling into the deck / kerb unit.

(vi) The Brackets used shall position the conduit to be clear of the waterway area, and shall not obstruct any transverse tensioning rods for the deck units.

(vii) All work shall be at no cost to Council, and the design for the proposed brackets and conduit system shall be forwarded to Council for approval.

(viii) Should the existing structure NOT have guardrail, the conduit shall be positioned so as to deflect away from both ends of the structure to allow for the future installation of guardrail.

3.0 Gas Facilities 3.1 All installations under existing or constructed bitumen or asphalt surfaced roads are to be bored unless specifically

approved in writing by Council under exceptional circumstances. Only roads with gravel surfaces may be trenched. Road crossings should be at 90 degrees to the road centreline wherever possible.

3.2 Trenching and reinstatement is to be generally in accordance with Council’s Standard Drawing A3-898. 3.3 Kerb markers are to be installed at all kerb crossings. Marker posts are to be installed at a maximum spacing of 200

metres. 3.4 All damaged and disturbed areas are to be reinstated to original condition. Concrete paths, damaged during

construction, or if existing concrete pathways need to be modified or cut, full width panels or pathway between existing joints are to be removed and reinstated. Should sections of driveways/pathways be removed, the reinstatement shall include the installation of 16 mm diameter x 400 mm long dowels at 200 mm centres to the cut face. Any pathways that need to be removed shall be replaced in their entirely and no paths are to be cut longitudinally in half of part thereof.

3.5 All pipework and facilities are to be constructed within the standard gas / underground electricity alignment as shown on Drawings A3-882 to A3-890 and A3-897 for Urban Roads and A3-891 to A3-896 for Rural Roads.

3.6 The design and installation of all pipework and ancillary facilities are to conform to all relevant Australian Standards. 3.7 A minimum cover of 1000 mm, to the top of pipework, is to be provided and maintained in the trafficable areas of the

road reserve. 3.8 Traffic control, during construction and maintenance, is to be provided and maintained in accordance with

Queensland Transport & Main Roads ‘Manual of Uniform Traffic Control Devices’. 3.9 Council’s future works may require the relocation of this installation and these relocation costs are to be met by the

facilities’ owner. 3.10 All works within the boundaries of State Controlled Roads also require approval from Queensland Department of

Transport & Main Roads. 3.11 The carrier is to obtain current details of Council’s services from Council. Any damage to Council’s services will be

repaired at the carrier’s cost. 3.12 Council’s ‘As Constructed’ data shows mains reticulation only. Service conduits may also be encountered during

construction and these should be identified prior to excavating. Repairs to any damage to these services will be the responsibility of the contractor.

3.13 The Contractor is to ensure that satisfactory sediment and erosion controls are installed and maintained in

accordance with Institute of Engineers Guidelines. 3.14 All areas that are disturbed by the operations are to be restored to the original conditions which will include, but not

be limited to, levelling, compaction to prevent future sinking, top soiling and turf. 3.15 The Gas Authority shall provide As Constructed details of non-standard alignments to Council and Council shall keep

a record of all non-standard alignments granted. 3.16 Contact Council’s representative / inspector to arrange for inspection of the completed works by Council. 3.17 Tree Removal

(a) Rural Areas – The removal of any trees greater than 200 mm diameter or clearing greater than 500 m2 must be approved separately by Council. The submission should include photographs of the site, statement of environmental effects and any environmental controls proposed.

(b) Urban Areas – The removal of any tree must be approved separately by Council. The submission must include photographs of each individual tree identified for removal. Any approval shall be subject to the following conditions:-

• All debris associated with the work is to be removed from the site.

• The stump is to be ground below the level of the nature strip and backfilled to original level of the nature strip.

• No other vegetation is to be damaged.

• A replacement street tree shall be planted and maintained to establishment for each tree removed.

• Footpath to be left in a clean, tidy and safe condition. 3.18 Tree pruning shall comply with Australian Standard AS 4373- 2007 Pruning of Amenity Trees. 3.19 Location of utility services on Council-owned infrastructure such as culverts, bridges, boardwalks and water towers

or on land owned by or under Council control will not be permitted unless:-

(i) The relevant service authority has indemnified council against future costs of relocation. (ii) Works are undertaken at no cost to Council. (iii) Where a second party wishes to attach services to a Council owned bridge or culvert, Council’s requirements

regarding location, design and maintenance are to be met. (iv) Ducting shall generally be galvanised steel tubing and mounted in brackets on the outside of the downstream

deck / kerb unit. Brackets shall be hot dip galvanised and fastened using stainless steel fasteners into the ferrules cast into the outside of the units.

(v) Where ferrules do not exist, approval shall be sought from Council to use Stainless Steel Chemset (epoxy type) anchors. If this method is required, care will be required not to damage the reinforcement of the structure when masonry drilling into the deck / kerb unit.

(vi) The Brackets used shall position the conduit to be clear of the waterway area, and shall not obstruct any transverse tensioning rods for the deck units.

(vii) All work shall be at no cost to Council, and the design for the proposed brackets and conduit system shall be forwarded to Council for approval.

(viii) Should the existing structure NOT have guardrail, the conduit shall be positioned so as to deflect away from both ends of the structure to allow for the future installation of guardrail.

4.0 Telecommunications Facilities 4.1 All procedures and agreements are to be in accordance with the Telecommunications Act and Austroads Guidelines.

Communication Alliance Ltd Guidelines G591 and ACIF Code C524. 4.2 All conduits / cabling under constructed bitumen or asphalt surfaced roads are to b bored unless specifically approved

in writing by Council under exceptional circumstances. Only roads with gravel surfaces may be trenched. Road crossings should be at 90 degrees to the road centreline wherever possible.

4.3 Trenching and reinstatement is to be generally in accordance with Council’s Standard Drawing A3-898. 4.4 Redundant pits, cables and conduits are to be removed and the area reinstated. 4.5 Cable installations will not be approved in Council reserves without prior approval of Council’s Technical Service

Department and/or Mackay Water. 4.6 All facilities are to be constructed within the standard telecommunications alignment as shown on Drawing A3-882

to A3-890 and A3-897 for Urban Roads and A3-891 to A3-896 for Rural Roads. 4.7 A minimum cover of 450 mm from top of the conduit is to be provided in level established grassed verge / footpath

and 1000 mm under road pavements. Infrastructure markers are to be provided at all kerb crossings, footpaths and driveways. These will be set flush into all kerb crossings, footpaths and driveways.

4.8 Optical Fibre Network

1. Rural Areas – Trenching, Conduit Installation and direct Buried Cable shall be installed at a minimum of 450 mm cover in formed verges and 1000 mm in unformed verges with road crossings at a depth of 1000 mm, with a detectable marker tape for the entire length of the construction.

2. Urban Areas – All buried conduit shall have a minimum cover of 1.2 m under pavements at road crossings (i.e. concrete, asphalt and pavers) and minimum cover of 0.6 m from top of the conduit in level established grassed verge / footpaths in road reserves. Infrastructure markers are to be provided at all kerb crossings, footpaths and driveways. These will be set flush into all kerb crossings, footpaths and driveways. A detectable marker tape to be installed at the time of construction or similar method so that the Optical Fibre Network is accurately locatable with a cable locator at all times.

4.9 In urban areas where the verge is not a nominal 2% from back of kerb. The Council shall be contacted to determine

final levels. Installation of Telecommunications infrastructure at the existing level may compromise Council’s ability for subsequent verge or footpath construction. Similarly (in urban and rural areas) where the verge rises either side of a driveway, pit location / level and conduit depths shall be set at a level that allows the verge to be cut down to achieve a continuous accessible path of travel as defined in AS 1428.1.

4.10 Traffic control is to be provided and maintained in accordance with Queensland Transport & Main Roads’ ‘Manual of

Uniform Traffic Control Devices’. 4.11 The carrier is to ensure that the design meets co-location obligations contained within the Telecommunications Act.

Council’s future works may require the relocation of this installation and these relocation costs are to be met by the responsible parties nominated in the Communications Guideline G591.

4.12 RIM, CMUX, ISAM or similar cabinets are not to be located within a footpath area unless specific Council approval

is obtained. Council’s preferred location for T\RIM cabinets, in developed areas, is set back from the road reserve boundary either in parks or additional road reserve allocation. Concrete slab at rear of cabinet is to extend to property boundary. This may require liaison with Developers and/or Queensland Department of Environment and Resource Management prior to submitting the proposal to Council. Concrete slabs to cabinets are to extend to the property boundary. Cabinet slabs shall be set at such a level so as to not create a trip hazard.

4.13 All works within the boundaries of Declared Main Roads are to be approved by Queensland Department of Transport

& Main Roads. 4.14 The carrier is to obtain current details of Council’s services from Council. Any damage to Council’s services will be

repaired at the carrier’s cost.

4.15 Council’s ‘As Constructed’ date shows mains reticulation only. Service conduits may also be encountered during

construction and these should be identified prior to excavating. Repairs to any damage to these services will be the responsibility of the contractor/carrier.

4.16 The contractor/carrier is to ensure that satisfactory sediment and erosion controls are installed and maintained in

accordance with Institute of Engineers Guidelines. 4.17 If existing concrete pathways need to be modified or cut, full width panels of pathway between existing joints are to

be removed and reinstated. Should sections of driveway / pathways be removed, the reinstatement shall include the installation of 16 mm diameter x 400 mm long dowels at 200 mm centres to the cut face. Any pathways that need to be removed shall be replaced in their entirety and no paths are to be cut longitudinally in half of part thereof.

4.18 Where new services are pulled through existing conduits the Telecommunication Authority shall confirm that the

existing conduits are at correct alignments and depths. The Telecommunication Authority shall indemnify Council against all future costs to lower or relocate to the correct alignment if required for works. Council or developers are required to meet all costs of relocation or lower for works impacting on existing Telecommunication Authority’s plant, provided the plant is on correct alignment, or if the Telecommunication Authority has approval or written agreement for the Non-Standard alignment,.

4.19 At stream locations Council would prefer that the Telecommunication Authority remain on correct alignment. Where

services are attached through or to the outside of existing culverts, bridges or floodway structures at the convenience to the Telecommunication Authority, the Telecommunication Authority shall indemnify Council against all future relocation costs should the culvert, bridge or floodway require to be reconstructed, widened or replaced.

Where conduit provisions (or service ducts) are made within new bridge structures, it shall be the bridge owner's responsibility to bear relocation costs in the future, should the b ridge be widened or reconstructed.

4.20 Tree Removal

(a) Rural Areas – The removal of any trees greater than 200 mm diameter or clearing greater than 500 m2 must be approved separately by Council. The submission should include photographs of the site, statement of environmental effects and any environmental controls proposed.

(b) Urban Areas – The removal of any tree must be approved separately by Council. The submission must include

photographs of each individual tree identified for removal. Any approval shall be subject to the following conditions:-

• All debris associated with the work is to be removed from the site

• The stump is to be ground below the level of the nature strip and backfilled to original level of the nature strip

• No other vegetation is to be damaged.

• A replacement street tree shall be planted and maintained to establishment for each tree removed

• Footpath to be left in a clean, tidy and safe condition. 4.21 Tree Pruning shall comply with Australian Standard AS 4373-2007 Pruning of Amenity Trees. 4.22 All areas that are disturbed by the operations are to be restored to the original conditions which will include, but not

be limited to, levelling, compaction to prevent future sinking, topsoiling and turf (or seed with a compatible grass seed mixture in rural areas).

4.23 Aerial cable crossings of roads must achieve a minimum clearance of 5.5 m above the entire trafficked roadway. 4.24 Where the proposed works requires trenching through turf, destruction of vegetation, cutting of driveways,

construction of pillars, pits or poles fronting private property, Council recommends the Telecommunication Authority consult with the affected property owner.

4.25 The Telecommunication Authority shall provide As Constructed details of non-standard alignments to Council and

Council shall keep a record of all non-standard alignments granted. 4.26 Contact Council’s representative / inspector to arrange for inspection of the completed works by Council. 4.27 Location of utility services on Council-owned infrastructure such as culverts, bridges, boardwalks and water towers

or on land owned by or under Council control will not be permitted unless:

(i) The relevant service authority has indemnified Council against future costs or relocation. (ii) Works are undertaken at no cost to Council.

(iii) Where a second party wishes to attach services to a Council owned bridge or culvert, Council’s requirements regarding location, design and maintenance are to be met.

(iv) Ducting shall generally be galvanised steel tubing and mounted in brackets on the outside of the downstream deck / kerb unit. Brackets shall be hot dip galvanised and fastened using stainless steel fasteners into the ferrules cast into the outside of the units.

(v) Where ferrules do not exist, approval shall be sought from Council to use Stainless Steel Chemset (epoxy type) anchors. If this method is required, care will be required not to damage the reinforcement of the structure when masonry drilling into the deck / kerb unit.

(vi) The Brackets used shall position the conduit to be clear of the waterway areas, and shall not obstruct any transverse tensioning rods for the deck units.

(vii) All work shall be at no cost to council, and the design for the proposed brackets and conduit system shall be forwarded to Council for approval.

(viii) Should any existing structure NOT have guardrail, the conduit shall be positioned so as to deflect away from both ends of the structure to allow for the future installation of guardrail.