Civil Engineering Reference
In-Depth Information
Example 7.4
The total estimated duration of the mass excavation activities in an office
building project is 40 days. After 15 days, the project manager receives the
following information:
Type of Excavation
Task No.
Total
Quantity
(CY)
Unit
Price
($)
Total
Budget
($)
Actual
CY
Actual
Cost
($)
Mass Excavation
TOB11110
39,000
—
176,500
13,200
59,700
Common Earth
TOB11111
20,000
2.50
50,000
7,800
17,950
Clay
TOB11112
8,000
5.50
44,000
1,200
5,850
Rock
TOB11113
11,000
7.50
82,500
4,200
35,900
Perform an EV analysis. Note that the “Mass Excavation” line is a sum-
mary of the 3 lines below.
Solution
The solution, using the equations given in example 7.2, is tabulated as
follows:
Activity
TOB11110
TOB11111
TOB11112
TOB11113
TOTAL BUDGET ($)
176
,
500
50
,
000
44
,
000
82
,
500
% COMPLETE
32
.
63
39
.
00
15
.
00
38
.
18
ACWP ($)
59
,
700
17
,
950
5
,
850
35
,
900
BCWP ($)
57
,
600
19
,
500
6
,
600
31
,
500
BCWS ($)
66
,
188
18
,
750
16
,
500
30
,
938
CV ($)
−
2
,
100
1
,
550
750
−
4
,
400
SV ($)
−
8
,
588
750
−
9
,
900
562
SV (DAYS)
−
1
.
95
0
.
17
−
2
.
24
0
.
13
CPI
0
.
96
1
.
09
1
.
13
0
.
88
SPI
0
.
87
1
.
04
0
.
40
1
.
02
FCV ($)
−
6
,
436
3
,
974
5
,
000
−
11
,
524
FSV (DAYS)
−
5
.
96
0
.
44
−
14
.
96
0
.
33
In the analysis of the results, we can make the following six comments:
1. Looking at the overall budget, we find that the Mass Excavation opera-
tion is slightly ($2,100) over budget. With further investigation, we find
that the main reason for this budget overrun is the Rock Excavation,
which is $4,400 over budget. In fact the other two excavation activ-
ities, Common Earth and Clay, are slightly under budget. This is an
example of when above-standard performance masks below-standard
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