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OCR for page 130
Supplementary As-Built Cost Analysis 95
LIGHT + HEAVY RAIL: ALL SOFT COSTS LIGHT + HEAVY RAIL: PE + FD COSTS ONLY
60% 60%
PE + FD Costs (% of Construction)
Soft Costs (% of Construction)
50% 50%
40% 40%
30% 30%
2
R = 0.06 2
R = 0.00
20% 20%
10% 10%
0% 0%
- 2 4 6 8 - 2 4 6 8
Years Elapsed between PE and Construction Years Elapsed between PE and Construction
2 2
Sample Size: 13 R = 0.06 t-Stat = 0.86 Sample Size: 13 R = 0.00 t-Stat = 0.15
Figure 70. Soft costs as a percentage of construction versus years elapsed between preliminary engineering
and construction.
Figure 72 presents the variance between the project opening date projected during the prelim-
inary engineering phase and the actual project opening date and compares this to soft costs as a
percentage of construction. Presumably, a deviation from the opening date predicted during
engineering phases represents a delay. Note that many projects in this dataset were not delayed
at all (zero years), while two actually opened ahead of schedule. Figure 72 shows no strong relation-
ship with years of delay and the proportion of soft costs.
C.15. Vertical Profile and Soft Cost Measurement
Somewhat surprisingly, this soft cost analysis found a relatively weak correlation between
vertical profile (and by extension, project complexity) and a variety of soft costs measured as a
percentage of construction costs. One possible explanation for this finding is that tunneling and
aerial structures increase construction costs so rapidly that soft costs as a share of the project do
not change measurably beyond the construction costs and increase the soft cost proportions.
LIGHT + HEAVY RAIL: ALL SOFT COSTS LIGHT + HEAVY RAIL: ADMIN COSTS ONLY
50% 50%
Management (% of Construction)
Soft Costs (% of Construction)
45% 45%
40% 40%
35% 35%
30% 30%
25% 25%
20% 20%
15% 15%
10% 2
10% 2
R = 0.00 R = 0.01
5% 5%
0% 0%
- 2 4 6 8 10 - 2 4 6 8 10
Years Elapsed between PE and Operations Years Elapsed between PE and Operations
2 2
Sample Size: 13 R = 0.00 t-Stat = -0.06 Sample Size: 13 R = 0.01 t-Stat = -0.39
Figure 71. Soft costs as a percentage of construction versus years elapsed between preliminary engineering
and operations.
