Detailed cost opinion report

186 Pages·2013·9.82 MB·English

C ity of Melbourne DCP cost opinion Commercial-in-Confidence
report

City of Melbourne
25 June 2012

Detailed Cost Opinion
Report
Projects in Arden Macaulay, City North & Southbank
AECOM City of Melbourne DCP cost opinion report
Detailed Cost Opinion Report
Detailed Cost Opinion Report
Projects in Arden Macaulay, City North & Southbank

60246999

Prepared for
City of Melbourne

Prepared by
AECOM Australia Pty Ltd
Level 28, 91 King William Street, Adelaide SA 5000, Australia
T [phone] F [phone] www.aecom.com
ABN 20 093 846 925

25 June 2012

60246999

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Commercial-in-Confidence
AECOM City of Melbourne DCP cost opinion report
Detailed Cost Opinion Report
Quality Information
Document Detailed Cost Opinion Report
Ref 60246999
Date 25 June 2012
Prepared by David Headland
Reviewed by Matthew Morrissey

Revision History
Authorised
Revision
Revision Details
Date
Name/Position Signature
A 4-April-2012 For Client Comment Matthew Morrissey
Associate Director
B 16-Apr-2012 For Client Comment Matthew Morrissey
Associate Director
C 27-Apr-2012 For Issue Matthew Morrissey
Associate Director
D 26-Jun-2012 For Final Issue Matthew Morrissey
Associate Director

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AECOM City of Melbourne DCP cost opinion report
Detailed Cost Opinion Report
Table of Contents
1.0 Introduction 1
2.0 Methodology 3
3.0 Summary of Costed Items 3
4.0 Exclusions and qualifications 6
Appendix A
Arden Macaulay A
Appendix B
Bridges – Arden Macaulay B
Appendix C
Pump Stations – Arden Macaulay C
Appendix D
Arden Macaulay - Intersections D
Appendix E
City North E
Appendix F
City North - Intersections F
Appendix G
Southbank G
Appendix H
Southbank - Intersections H

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Detailed Cost Opinion Report
1.0 Introduction
AECOM has been commissioned by the City of Melbourne to prepare a detailed cost opinion for a Developer
Contribution Plan (DCP) to apply to the inner city precincts of Arden Macaulay, City North and Southbank. The
projects costed have been designed to meet the requirements and targets set in the structure plans for each
project. The detailed costing has been produced to provide the City of Melbourne with an understanding of the
cost required to upgrade the infrastructure in the three precincts. The information contained within this report will
be used to directly inform the DCP.
Further information including alternative street designs, master plan and development of the public realm assets
can be found in the Arden Macaulay, City North and Southbank Structure Plans.
The costs for each project can be found in the appendices of this report.
1.1 Precincts
The detailed cost opinion was based on projects within the precincts shown in the figures below:

Figure 1 : Arden Maca ulay P recinct Figure 2: City North Precinct

Figure 3: Southbank Precinct

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1.2 Basis of Assessment and References
The costing was based on correspondence, and documents provided by the City of Melbourne via mail on 29
February, 1 March, 8 March and 19 March 2012:
- Street cross section concepts and location maps
- Performance Assessment Criteria, Streets and Local Centres dated 14/2/12
- 120402_Rep Sections_Drainage_Isuue A.pdf
- Local Centre Concept plans
- CP_VS_01, 02, 03_issue A
- KSA1 DETAILED CONCEPTS FOR COSTING RCR01, 02, 03, 04, 05
- 120302_MCC Westgate Freeway Undercroft Spaces Oppertunity Review.pdf
- 120302_Project Design Intent_Southbank.pdf
- 120308_Southbank Area of Crown Reserve and Leasehold.pdf
- 12601_Kensington Station ProjCond_RevA and SK Concept_Rev B1.pdf
- Schedule of items
- ARDEN MAC STREET SCHEDULES – ISSUE B.xls
- CITY NTH STREET SCHEDULES – ISSUE B.xls
- 1200402_SOUTHBANK A.PWF_Rev B.xls
- 120402_SOUTHBANK B.WF_RevB.xls
- 120316_EICT ST CONCEPT PLAN St Schedule.xls
- RCR02 MACAULAY LOCAL CENTRE – ISSUE B.xls
- RCR03 WRECKYN LOCAL CENTRE – ISSUE B.xls
- RCR04 THERRY LOCAL CENTRE AND CONNECTOR – ISSUE B.xls
- RCR05 PELHAM GREENWAY - ISSUE B.xls
- GIS data
- Drainage network layout
- Public lighting network
- Schedule of rates
- 01 cis schedule of rates(1)01March12.xls
- Cardno Report
- Arden Macaulay Precinct Flood Investigation dated 4/4/2012
- Structure Plans
- Arden Macaulay Structure Plan
- City North Structure Plan
- Southbank Structure Plan
- Bridge Concepts
- 120223_Bridge Design Intent Outlines.pdf
- Macaulay Rd Bridge Design Intent_Rev A.pdf
- Stormwater Harvesting Scheme
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(cid:16) COM_SERVICE_PROD_#7079171_v1_Stormwater_Harvesting_sites_Arden_Macaulay_
Structure_Plan_2012_Sustainable_Infrastructure.PDF
(cid:16) COM_SERVICE_PROD_#7079173_v1_Stormwater_Harvesting_sites_City_North_Structu
re_Plan_2012_Sustainable_Infrastructure.PDF

In addition to data provided by the City of Melbourne, additional information for the detailed cost opinion was
taken from the Rawlinson’s Construction Handbook (2011) as well as experience from similar projects.
2.0 Methodology
A Geographic Information System (GIS) model was created to map the location and extents of items for each
street project. Quantities for each of the items were obtained from this model and used to create the detailed cost
opinion. GIS was used to enable accurate plotting of items on a plan as shown on the street cross sections
provided by the City of Melbourne. GIS also enabled items such as kerb ramps and trees to be placed accurately
in the required locations, reducing the occurrence of double ups. A conservative approach was taken when
making decisions as to the location and extents of each item.
A spreadsheet containing those items to be costed was created with unit rates taken from the City of Melbourne
2011/2012 construction costs, Rawlinson’s construction handbook 2011 and from previously costed projects.
Quantities from the GIS model were input into the spreadsheet to create the final cost for each project.

2.1 Limitations
The detailed cost opinion contained within this report has been based on concept plans and cross sections
provided by the City of Melbourne. No detailed design has been undertaken and as such no guarantee is given for
the constructability of the projects. All costs contained in this report have been based on present day rates and no
allowance has been made for the escalation of material and labour costs over the project life.
The actual construction cost of the projects may vary from the costs presented in this report as they progress to a
detailed design phase, through a greater understanding of the project quantities and requirements. Items listed in
section 4.0 of this report may contribute to a higher total construction cost which has not been allowed for in this
report.

3.0 Summary of Costed Items
3.1 Demolition
The cost of demolition was costed at a rate of $115 per square metre. This cost was taken from the City of
Melbourne cost schedule and correspondence with the City of Melbourne.
Demolition is typically an unknown quantity and depends greatly on the existing services and complexity of
removing infrastructure assets. It has been assumed that only the above ground assets will be removed (eg
pavement, kerb and gutter, street trees, street furniture). The cost of disposal of removed material will increase if
found to be contaminated.

3.2 Carriageway
The Carriageway was separated into two treatments, permeable and non-permeable. The non permeable portion
of the carriageway will exist in the trafficable lanes, while the permeable treatment will be restricted to the on
street car parking lanes. Permeable paving is more difficult to construct than non-permeable pavement, with
materials also subjected to a higher price. The cost of the carriageway has been separated into the components
that are required to build a road (subgrade, subbase, basecourse and seal). The surface treatment type (asphalt
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or bluestone setts) has been taken from the schedule of items for each street type provided by the City of
Melbourne. Traffic modelling, geotechnical investigation and pavement design has not been performed, hence the
cost for each item is based on an estimate from experience.

3.3 Working around Tramway
A tramway exists in a number of street projects and has been assumed to occupy a 6.6m wide strip in the
carriageway as shown on the cross sections. Although the schedules specify that the tramway will remain (not to
be touched during construction, unless noted otherwise), an allowance has been made to quantify the difficulties
in construction on a road where an operating tram exists. Difficulties will include traffic management, slower
construction rate, matching into the existing tram way and more stringent safety requirements.
The Southbank Boulevard project between St Kilda and Sturt Roads will involve realigning the tramway to move it
to the centre of the new carriageway. The cost for the realignment has been taken from experience on projects
such as the Box Hill, Vermont South and Docklands Drive tram way extensions.

3.4 Kerbing
Kerbing has been located as shown on the cross sections provided by the City of Melbourne. Two types of
kerbing have been specified in this costing; bluestone kerb and gutter, and bluestone flush kerb. Kerb and gutter
has been placed where the cross fall (as shown on the cross sections) of the road dictates that the kerb will
collect water. Flush kerb was placed in the Southbank precinct, for primary waterfront projects only. Prices for
these kerbs have been based on the costs provided in the City of Melbourne cost schedule.
Bluestone kerb ramps, with granite detail and tactile ground surface indicators (TGSI) have been placed at all
intersections where a pedestrian will have to either step on or off a kerb.
3.5 Median
Bluestone medians with bluestone infill, granitic gravel infill and vegetation infill have been specified. The location
of each median treatment has been based on the schedule of items supplied by the City of Melbourne. GIS has
been used to position the medians with breaks at intersections to increase the accuracy of the cost for the
median. The unit price for the median has been calculated using a unit length of bluestone kerbing and a square
metre rate for the infill material as specified in the project schedules. Reinforced/engineered soil has been allowed
for as part of the tree calculations, and as such has not been allowed for in the medians.
All medians, including bike separator, tram separator and carriageway medians have been taken into account
under the one heading. Tree buildouts where specified in the street cross sections, have been taken into account
under the ‘Tree’ items.
3.6 Footpath
The footpath has been positioned with dimensions as shown on the cross sections and has been extended along
the length of the road section with breaks only where intersections occur. Two types of footpath have been
specified; porous asphalt and bluestone pavers. The unit cost of the footpath was taken from the City of
Melbourne cost schedules.
3.7 Street Furniture
Street furniture costed as part of this report has been limited to seats, bins, bicycle hoops, bollards and drink
fountains. Each furniture item has been placed according to the linear rate specified in the schedules provided by
the City of Melbourne. The cost of these items has been taken from the City of Melbourne cost schedule.

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3.8 Trees
Trees have been placed along each street section at the linear frequency specified in the schedules provided by
the City of Melbourne. The cost for each tree has been broken up to include the cost of preparing 36 m3 of
engineered soil, supply and installation of irrigation infrastructure (irrigation lines, subsoil drainage and ventilation
pipes), supply and installation of a plastic tree pit, supply and planting of a tree (200ltr size) and supply and
installation of a galvanised/powder coated tree guard. The cost of the irrigation infrastructure has been costed on
a per tree rate rather than a per metre rate to capture the increase in cost of having multiple rows of trees.
3.9 Recycled Water
Recycled water main has been placed along the length of every street project to reticulate recycled water to the
street trees for irrigation purposes. A nominal diameter of 150mm HDPE recycled water pipe has been selected
as a conservative assumption on the pipe size required for the reticulation of recycled water. AECOM has not
performed any design calculations or modelling into the recycled network.
3.10 Stormwater
The stormwater layout provided by the City of Melbourne has been used to base the costs of the new stormwater
in each project. The City of Melbourne have advised that they would like to upgrade the current system, which is
operating at a 1 in 2 year ARI storm capacity, to a 1 in 20 year ARI storm system. The current pipe sizing has
been increased by two sizes (approximately 140%) to cater for the extra flows. Additional pits and pipes have
been placed on the opposite side of the road to the existing network to ensure that all properties are able to drain
directly into the underground network as requested by the City of Melbourne.
It should be noted that no hydraulic design has been performed on the system and no guarantee can be given
that simply upsizing the pipes will cater for a 1 in 20 year ARI storm.
3.11 Street Lights and Electrical
Street lights have been costed based on the six standard City of Melbourne poles as specified in the street
schedules. Street lights have been assumed to exist at intervals specified on the detail drawings, with the number
of lights based on those shown in each cross section for each project.
Should the City of Melbourne wish to install solar powered street lighting instead of the standards luminare, a cost
factor of 2.0 should be applied to approximate the cost to install.

A common service trench for the undergrounding of low voltage electrical cables has been assumed to exist on
one side of each street section for the entire length. The cost of the trench includes digging, provision of bedding
material, installation of conduits and has been based on experience. No allowance has been made for the
provision of individual property connections or fees and charges that may be sought by authorities.
3.12 Signalisation
The cost of redesigning and re-constructing additional traffic signals to allow greater bicycle and pedestrian
access/priority have been taken into account as a separate cost item for each intersection. Additional pedestrian
crossing lights have also been allowed for where shown on the local centre plans and the Structure Plan. The cost
for each signalised intersection has been based on experience from previous projects on similar sized
intersections and is a general cost only. Items such as service relocation and traffic management (dependant on
construction methodology) may result in an increased cost.
3.13 Stormwater Harvesting
The City of Melbourne requested an allowance for the construction of a stormwater harvesting scheme,
comprising of two medium sized tanks (450 kL) and one large tank (5 ML) in the precincts of Arden Macaulay and
City North. The stormwater harvesting scheme will involve the construction of underground tanks, pump stations
and a reticulation network. The reticulation network has been allowed for in the street projects. The City of
Melbourne have undertaken this sort of project on in the past, and requested that AECOM include the costs of
these projects as the estimate for the scheme.
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3.14 Bridges
Three bridges were specified as project s in the Arden Macaulay precinct; Widening of the Macaulay Road Bridge,
(increase existing width by approximately 4.3m, as requested by the City of Melbourne) and 2 footbridges over
Moonee Ponds Creek from Smith Street and Chelmsford Street. A design intent document was supplied by the
City of Melbourne specifying general construction materials, aesthetic and location. The cost for these bridges
was calculated on a per square metre rate based on previous bridge construction projects. The cost includes:
(cid:120) Bridge engineering design
(cid:120) Substructure construction
(cid:120) Superstructure construction
(cid:120) Construction supervision

No geotechnical investigation or structural design was undertaken in the costing of these bridges due to the highly
conceptual nature of the design intent. It is therefore unknown what effect the ground conditions will have on the
structural design of the bridges. The costs presented are based on typical construction techniques based on rates
used for past projects of a similar scale.

3.15 Pump Stations
Six pump stations exist in the precinct of Arden Macaulay. The pump stations are currently housed in heritage
listed buildings which have been requested to remain. The upgraded pumps have been designed by Cardno, with
costs for these pumps also taken from this report. It has been assumed that the new pumps will be able to fit in
the existing housing, with only minor modifications required. The cost of upgrading the upstream pipe network has
been allowed for in the cost of upgrading the stormwater pipes for each project. A cost for telemetry of the pump
stations has been allowed for based on the assumption that City of Melbourne has existing infrastructure in place
to monitor the output from the telemetry hardware.
4.0 Exclusions and qualifications
As the project has limited information, based on the conceptual nature of a Developer Contribution Plan (DCP)
and the omission of any detailed design to cost from, the AECOM report is limited to the information available at
the time of this report. As some items are unknown, we have excluded them from our report however these costs
should be considered by The City of Melbourne as they may or may not impact the DCP final cost opinion.

Items listed below are general areas of exclusion, and or risk, that AECOM foresee as part of the detail not know
to date:
4.1 Underpass – Arden Macaulay
The City of Melbourne requested advice on the construction of a structure that would pass over Moonee Ponds
Creek and under the adjacent railway. AECOM have expressed concern for this type of structure:
- Disabled Access:
(cid:131) An under and over pass in this area will require significant design in terms of disabled access and
safety. Design requirements in terms of depth, stairs, ramps and lighting will need to be taken into
account
- Flooding
(cid:131) Moonee Ponds Creek is known to flood in the area of Arden Macaulay. The underpass under the
railway will have to be constructed at a level below the top water level of the creek resulting in a
high likely hood of flooding of the underpass. Pump stations will have to be constructed to ensure
that the water level does not reach unacceptable levels in the underpass.
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