Shire of Carnarvon
CONDITIONS OF APPROVAL
FOR EXCAVATIONS WITHIN
ROAD RESERVES
The following conditions for the opening up of roads should be read in conjunction with the
Utility Providers Code of Practice for Western Australia (2002), Restoration and
Reinstatement Specification for Local Governments in Western Australia 2002 and AUSSPEC #2 Specification 306.
GENERAL CONDITIONS
1.
No works shall commence on site until the form attached to these conditions has
been filled out by the contractor and signed and approved by the Manager
Design Services or his representative.
2.
A reinstatement bond shall be payable before any works commence. This bond is
payable and held until the excavations have been satisfactorily reinstated at which
time the bond will be returned in full. The bonds payable are as follows –
Excavation less than 20m
Excavation greater than 20m
$ 500
$ 1000
Bonds will be held for the duration of the works and will only be returned upon
completion of the works and subsequent inspection and approval by the Director
of Works & Services or his representative.
3.
The contractor shall provide the Shire of Carnarvon with a traffic management
plan, prepared to Australian Standards by an Advanced Worksite Traffic
Management accredited person, clearly showing all signage and set up distances
at the time of submitting this application.
4.
Council by-laws, local laws and policies shall be complied with at all times.
5.
All excavation work shall be supervised by a person experienced in the trade
applicable.
6.
It is the contractor’s responsibility to locate all services including stormwater prior to
commencement of the excavation works.
7.
The Shire’s Horticulture section shall be contacted prior to any excavation taking
place within three (3) metres of the base of any trees within the road reserve
(verge).
8.
Notification shall be given to the Works & Services Department at least 5 working
days prior to the commencement of work or recommencement of work after any
prolonged cessation of the works.
9.
Residents shall be advised of intended works at least 5 working days prior to the
commencement of the works where they are deemed to be affected.
10.
Cultivated lawns shall be removed for the full top width of the excavation by
cutting with a sodding machine and the sods neatly stacked in a manner to ensure
the maximum possibly preservation of the lawn. After completion such lawns shall
be reinstated as near as practical to their original conditions.
11.
In the event of any irregularities or emergencies occurring, the Shire’s Works &
Services Department must be notified immediately of the problem(s) occurring and
the intended remedial action.
Any damages which may occur to Shire facilities, service authority property or
private property during the course of the road excavation operations, either
directly or indirectly or which may subsequently be evident from the operations
thereof, shall be the sole responsibility of the applicant, who shall be responsible for
he repair, replacement, legal claim liability or result which may arise from the road
cutting.
12.
13.
The attached application form, a traffic management plan and a site plan,
indicating the exact location and dimensions of the road crossing, shall be
submitted to the Director of Works & Services at least 5 working days prior to
commencement of works.
Duty of Care
Anyone carrying out operations on a road open to traffic has a duty of care under
common
law to take all reasonable measures to prevent an accident or injury to persons carrying
out
the operations and also to members of the public lawfully using the road.
ROAD/ROAD RESERVE TRENCH EXCAVATION
Traffic
Where works required control of traffic, appropriate traffic control devices to be put in
place in accordance with AS 1742.3. The Contractor shall make adequate provision for all
traffic using the road or footpath and shall erect such barriers, warning signs, etc. as are
necessary to safeguard all traffic and accept all liability in connection with the works
covered by this approval and will indemnify the Council against all actions, claim and
demands made by any person or persons for injuries or damages suffered by him or them
by reason of non compliance or non observance of the conditions and precautions in this
Clause contained.
Road warning signs, banners, lights and flagman shall be placed in accordance with the
requirements of ‘Utility Providers Code of Practice for Western Australia (2002)’.
Applications for permission to close roads shall be forwarded to the Council for prior
approval thereof, at least 8 working days prior to the closing of any road to traffic. Such
notification shall also be forwarded to the Police, WA Fire Brigades Board and ST John’s
Ambulance Association and any other authorities as identified through the preparation of
a traffic management plan.
Road closures shall be kept to a minimum and every cut shall be backfilled and made
trafficable immediately pipe laying has been completed.
All roads will have at least half of the carriage way open to traffic at all times, ie. only half
the road may be excavated at one time unless alternative arrangements are made with
the Director of Works & Services.
Trenching
The road/verge surface (bitumen, asphalt or concrete), shall be cut with an approved
saw prior to the commencement of excavation works. Stockpiling of any excavated
materials other than immediately adjacent to the excavation shall be on approved sites
only.
Excavations that are the responsibility of Main Roads WA (North West Coastal Highway
and Exmouth/Minilya Road) require the contractor to notify Main Roads WA in Carnarvon
at least 15 working days prior to commencement of works.
RESTORATION AND REINSTATEMENT SPECIFICATION FOR BACKFILL OF TRENCHES
Reinstatement of the surface of roads, vehicular crossovers and footpaths shall be
undertaken by contractor, at the contractor’s expense in accordance with the following
documentation 

AUS-SPEC #2 Specification 306
Restoration and Reinstatement Specification for Local Government in WA 2002
The contractor if unable to reinstate the trench is to issue a Reinstatement Order to the
Shire immediately after work is completed, if applicable.
Competent contractors may reinstate road crossings within subdivisional releases, subject
to the prior approval of the Director of Works & Services. The work is to be covered in the
maintenance period of the subdivisional release.
Materials
Only approved material may be used as backfill material for road crossings for the full
depth except for the upper 300mm which shall consist of gravel or crushed rock road
base, evenly graded with a maximum aggregate site of 19mm.
Materials for backfilling trenches across driveways and compaction specifications shall be
the same as for road crossings, with the minimum depth of gravel being 200mm.
Materials for backfilling trenches across footpaths shall be clean sand or other material
approved by the Director of Works & Services to be brought up to the full depth of the
trench. No roadbase need be used.
On kerbed roads the gravel must be continued out past the edge of bitumen by 0.5m on
either side and on unkerbed and unsealed roads the gravel must be extended to the full
formation width.
For reinstatement works using concrete the following shall apply –



100mm deep concrete construction for residential areas including footpaths
and driveways
Concrete mix 20 Mpa with 75mm slump
Excavated site to be inspected by Shire staff before concrete is poured
Verge Compaction/Reinstatement
Before the verge backfill of the trench is commenced, all manholes and spaces around
the utility installed shall be carefully compacted with hand rammers. The minimum depth
of initial hand compaction above the crown of the pipe shall be no more than 150mm.
Compaction of the remaining backfill shall be in 300mm layers. Maximum compaction
shall be achieved by mechanical means to a density of not less than 95% of the maximum
dry density when tested in accordance with AS1289.5.4.1. The crushed rock roadbase
pavement shall be compacted to 98% of the maximum dry density when tested in
accordance with AS1289.5.4.1
Verges shall be backfilled to their original level and compacted equivalent to surrounding
ground or as required by the Director of Works & Services. Verges to e left in a clean and
tidy condition free of debris.
All verge backfilling will be covered by a 12 month maintenance period that commences
from the date that the work is completed.