Comprehensive Cost Analysis: Road Construction Project, Merry Street

This project provides a detailed cost estimation for the construction of a road, likely Merry Street, based on provided specifications and drawings. The cost analysis is broken down into several key areas, including site establishment, engineering services, earthworks, drainage, kerb and channel works, road pavement construction, sealing, and service modifications. The estimation includes itemized costs for materials, labor, and equipment, such as environmental policy fees, asphalt mixing plant hire, engineering fees, bulk excavation, supply of subsoil, drainage channel construction, and the installation of kerb and channel. The project also covers the construction of concrete pavements, sub-bases, and sealing of the road surface. Furthermore, the report provides detailed cost breakdowns for each item, including unit costs and quantities, culminating in a total estimated project cost of $636,803.53 (Inc GST).

Solution
Estimated Costs for road construction
Site establishment
Item Particulars Unit Quantity Rate Total
cost
1 Environmental policy fee
Hire for motor grader
Hire asphalt mixing plant
Hire road roller machine
Engineering report on adjoining
properties Dilapidation
Contract work insurance(0.35% of
contract)
Kerbs and footpath deposit bond
No
Days
Days
Days
No
Percentage
No
1
30
10
20
1
0.35%
1
$500
$500
$500
$500
$800
$2000000
$2500
$500
$15000
$5000
$10000
$800
$7000
$2500
Total $40,800
Engineering services and testing

Item Particulars Unit Quantity Rate Total
cost
2 Engineering fee
Consultant fee
Design and drafting (concept, Arch and
structure)
Contours and feature survey
Compaction Tests
Proctor test
California Bearing Ratio (CBR) Test
DUCTILITY AND SOFTENING POINT OF
BITUMEN
AGGREGATE IMPACT VALUE
No
No
No
No
No
No
No
No
1
1
1
1
1
1
1
1
$500
$300
$6000
$1000
$50
$50
$50
$50
$500
$300
$6000
$10000
$50
$50
$50
$50
Total $17,000
Total $22500
Earth work
Bulk excavation for general site preparation

Drainage
Ite
m
Particulars Unit Quantit
y
Rate Total
cost
3 Bulk excavation m3 150 $1500 $22500
Overall bulk area of excavation (plus working
space) = (12.83 + 4.08 + 2.00) x (11.87 +
2.00)
= 18.91 x 13.87 = 262.28
Estimated depths at corners: NE – 0.69m,
NW - 0.55m, SE – 0.50 and SW – 0.45)
Average depth = (0.690 + 0.54 + 0.45 +
0.40)/4 = 0.55m
Volume of bulk excavation = area x depth
= 262.28m2 x 0.55m = 144.25
Assume that only one side is battered =
18.91m x 1.0m wide x 0.55m = 10.40m3
Since battering is done at 45 degrees, battered
volume is = 0.5 x 10.40 = 5.20
Total volume of bulk excavation = 144.25 +
5.20 = 149.45

Ite
m
Particulars Unit Quantity Rate Total cost

4 A trapezoidal channel having a straight
alignment.
The cross-section is uniform
Design width 10 metres
Slope expected to be 1:1
Channel slope 0.003
Depth of water 5 metres
Calculation discharge
The wetted perimeter = 10 + 2(5 / cos 45°) =
24.1 m.
The cross sectional area = 1/2 x sum of
parallel sides x perpendicular height = 0.5(10
+ 20)(5) = 75 m².
The hydraulic radius = cross sectional area +
wetted perimeter = 75 / 24.1 = 3.1 m.
Manning's n = 0.06
Discharge, Q, using Manning's equation =
(0.06)-1 (75)(3.1)2/3 (0.003)1/2 = 146 m3/sec
Supply of sub soil = $50
Labour 5.00 m3/sec @ $50/m3/s = $250
$300
Installation of 600mm x 600mm Side Entry
Pit
Area = 0.6 m * 0.6 m = 0.36m2
Length of the pit = 1 m
Volume of the pit = 0.36 m3
Supply of sand and cement = $50
Labour 5.00 m3 @ $50/m3 = $250
M3/sec
M3
M3
146
0.36
0.36
$300
$300
$10
$43800
$108
$3.60

$300
Break into and adjust pits as required
Total volume required = 0.36 m3
Labour required = 1.00 m3 @ $10/m3 = $10
Supply and installation of 300mm dia.
Class 3 RC RRJ pipe
Total chainage length = 237.96 m
Supply of class 3 RC pipe = $200
Labour 1.00 m @ $10/m = $10
$210
Construction of 2.0m wide overland flow
path
Total length of flow path = 237.96 m
Width = 2.0 m
Area = 237.96 m * 2.0 m = 475.92 m2
Supply of concrete = $300
Labour 3.00 m2 @ $20/m2 = $60
$360
Supply and install 0.09m compacted depth
cement stabilised sand liner over installed
300mm dia. Pipe in open drain
M
M2
M
M
237.96
475.92
237.96 m
237.96
$210
$360
$360
$160
$49971.60
$171,331.20
$85,665.60
$38,073.60

Depth of cement stabilised sand = 0.09 m
Length covered = 237.96 m
Supply of cement stabilised sand = $300
Labour 3.00 m @ $20/m = $60
$360
Direct property connections to back of
kerb
Length of kerbs = 237.96 m
Supply of cement = $100
Labour 3.00 m @ $20/m = $60
$160
Supply and installation heavy duty cast
iron kerb adaptors
Length of kerbs = 237.96 m
Supply of cast iron kerb adaptors =
$150
Labour 3.00 m @ $20/m = $60
$210
m 237.96 $210 $49971.6
Total
Kerb & Channel and Other Concrete Works
Item Particulars Unit Quantity Rate Total
cost
5 Installation of kerb & channel, pram
crossings, house points

Kerbs required length = 237. 96 m
Labour for installation = 5.00 m @ $15/m =
$75
Pram crossing
Length 100 m
Labour for installation = 5.00 m @ $15/m =
$75
House point
Length = 50
Labour for installation = 5.00 m @ $15/m =
$75
Installation of 32MPa 150mm depth
doubly reinforced trafficable concrete
Depth = 0.15 m
Length 2.0 m
Width = 1.5 m
Volume = 0.15 * 2 * 1.5 = 0.45 m3
Labour for installation = 5 m3 @ $20/m3 =
$100
Supply and install 25MPa 125mm depth
concrete driveway with centrally placed
SL72 at No. 50 Merry Street.
Depth = 0.125 m
Length = 237.96 m
Width = 0.5 m
Volume = 0.125 m * 237.96 m * 0.5 m =
14.88 m3
Supply of 25MPa 125mm depth concrete =
M
M
m
M3
M3
237.96
100
50
0.45
14.88
$75
$75
$75
$100
$210
$17,847
$7500
$3750
$45
$3124.80

$150
Labour 3.00 m @ $20/m = $60
$210
Total $32267
Road Pavement Construction
Item Particulars Unit Quantity Rate Total
cost
6 Supply, place and compact 200mm Class 3
FCR sub-base
Length of sun base = 237.96 m
M3 33.31 $210 $6995.10

Depth = 0.02 m
Width 7.0 m
Volume = 237.96 * 7 * 0.02 = 33.31 m3
Supply of 200mm Class 3 FCR sub-base =
$150
Labour 3.00 m @ $20/m = $60
$210
Supply, place and compact 100mm Class 2
FCR base
Length of sun base = 237.96 m
Depth = 0.01 m
Width 7.0 m
Volume = 237.96 * 7 * 0.01 = 16.66 m3
Supply of 100mm Class 2 FCR base =
$150
Labour 3.00 m @ $20/m = $60
$210
M3 16.66 $210 $3498.60
Total $438,
925
Sealing
Ite
m
Particulars Unit Quantity Rate Total cost
7 Preparation of the pavement surface for
sealing
Length of pavement = 237. 96 m
M 237.96 $60 $14,277.60

Labour 3.00 m @ $20/m = $60
Design and application of 7mm primer seal
to the area to be asphalted
Length = 237.96 m
Width = 7 m
Depth = 0.007 m
volume coved = 7 .0 * 237.96 m * 0.007 =
11.66 m3
Labour 3.00 m @ $50/m = $150
M3 11.66 $150 $1749
Total $16,026.60
Service Modification
Ite
m
Particulars Unit Quantity Rate Total
cost
8 Adjustment to affected service authority
assets including property connections for
No - - $800

various services
Total $800
ITEM DESCRIPTION UNIT QTY RATE COST
$ $
1.01 Site Establishment
1.011
Site establishment including location of existing
services and payment of any fees as required by the
relevant service authorities. Establish and maintain all
necessary plant and equipment on site and de-
Item $40,800