| #projects |
#Risks |
type |
delivery method |
size |
|
| 19 |
1814 |
Bridge and Tunnel |
All |
All |
|
| Number |
Risk |
Frequency |
Prob |
Cost |
Schedule |
| 1 |
different site conditions |
100 |
0.52 |
5.58 |
0.14 |
| 2 |
additional right of way required |
73.7 |
0.30 |
1.54 |
0.25 |
| 3 |
additional construction easements formerly labeled r-4 |
73.7 |
0.50 |
0.68 |
|
| 4 |
construction noise |
68.4 |
0.41 |
0.25 |
1.00 |
| 5 |
relocation of utilities prior to construction |
68.4 |
0.23 |
1.01 |
0.38 |
| 6 |
aashto lrfd bridge design specifications |
68.4 |
0.36 |
12.50 |
0.35 |
| 7 |
additional preconstruction costs (administration and design extended overheads) due to schedule delays |
68.4 |
0.50 |
-0.25 |
1.00 |
| 8 |
approval for design exceptions - conceptual design - need to submit to fhwa - have had initial discussions |
63.2 |
0.30 |
1.00 |
1.37 |
| 9 |
increase cost for mitigation |
63.2 |
0.55 |
0.32 |
3.00 |
| 10 |
accelerate project construction |
57.9 |
0.46 |
8.19 |
1.15 |
| 11 |
utility coordination |
57.9 |
0.48 |
0.70 |
0.75 |
| 12 |
change to bridge substructure design assumptions (e.g., shaft/column length, diameter) |
52.6 |
0.60 |
2.11 |
-3.80 |
| 13 |
contaminated materials estimates |
52.6 |
0.37 |
3.87 |
1.17 |
| 14 |
encounter significant archaeological resources |
52.6 |
0.05 |
0.27 |
0.18 |
| 15 |
coordination issues |
47.4 |
0.28 |
0.20 |
0.00 |
| 16 |
constructability of design |
47.4 |
0.68 |
1.80 |
1.50 |
| 17 |
contractor does not comply with environmental restrictions |
47.4 |
0.25 |
|
0.80 |
| 18 |
changes to design standards |
47.4 |
0.40 |
1.03 |
0.50 |
| 19 |
funding delay |
47.4 |
0.33 |
10.00 |
3.75 |
| 20 |
flooding, first occurance, compensible event |
47.4 |
0.47 |
0.04 |
0.49 |
| 21 |
structural steel |
47.4 |
0.48 |
0.00 |
1.10 |
| 22 |
matenance during construction |
42.1 |
1.00 |
0.00 |
0.20 |
| 23 |
delays to finish of feis from programmatic enviromental delays |
42.1 |
0.42 |
|
0.34 |
| 24 |
complete right of way acquisition for construction |
42.1 |
0.29 |
0.34 |
5.79 |
| 25 |
construction delay in kg contract impacts first pontoon delivery - basin construction |
42.1 |
0.34 |
0.08 |
0.43 |
| 26 |
delay in tenant relocations |
42.1 |
|
1.00 |
|
| 27 |
cost premium associated with availability of labor |
36.8 |
|
|
|
| 28 |
permitting |
36.8 |
0.70 |
0.13 |
0.01 |
| 29 |
change in drainage design concepts |
36.8 |
0.33 |
3.50 |
0.30 |
| 30 |
delays in utility relocations due to delay in field work required from utility owners |
36.8 |
0.20 |
1.00 |
|
| 31 |
change orders |
36.8 |
1.00 |
71.10 |
|
| 32 |
delays due to unknowns |
36.8 |
0.73 |
1.00 |
8.00 |
| 33 |
additional third party agreements and/or mitigation (other than addressed separately) |
36.8 |
0.38 |
5.47 |
|
| 34 |
identification of ecological species delays (falcons) |
36.8 |
0.53 |
|
3.08 |
| 35 |
barge delivery is cost prohibitive due to barge draft requirements, permit restrictions, archaeological resources, source of construction materials, etc. |
36.8 |
|
|
|
| 36 |
permitting and approvals for which pa has sole resp. |
36.8 |
0.14 |
0.07 |
0.23 |
| 37 |
identify potential staging areas and dry dock availability |
36.8 |
|
|
|
| 38 |
risk that there are issues with pontoons after they are accepted from gray's harbor. |
36.8 |
0.32 |
0.45 |
0.77 |
| 39 |
design build procurement for the remaining bsb project (not ky-4) |
36.8 |
0.56 |
-0.60 |
-7.73 |
| 40 |
encountering unexpected subsurface conditions |
36.8 |
0.15 |
|
0.30 |
| 41 |
tunnel cross-section immersed tube tunnel (itt) vs. bored tunnel |
36.8 |
0.25 |
5.00 |
|
| 42 |
additional mitigation for section 4(f) impacts |
36.8 |
0.40 |
|
|
| 43 |
maintenance of traffic |
36.8 |
0.14 |
0.30 |
0.05 |
| 44 |
design quality control - dbc task |
36.8 |
|
|
|
| 45 |
issues gaining city of seattle and city of medina street use permit |
36.8 |
|
|
|
| 46 |
safety issues |
31.6 |
0.10 |
0.20 |
|
| 47 |
escalation of project costs (bids) |
31.6 |
0.85 |
|
|
| 48 |
materials quality |
31.6 |
0.60 |
20.00 |
0.30 |
| 49 |
bridge design put into db contract and not taken forward by the project team |
31.6 |
0.75 |
|
-4.50 |
| 50 |
construction interface issues with nysdot bridge repair contractor |
31.6 |
0.93 |
9.00 |
0.01 |
| 51 |
pepco utility transmission |
31.6 |
0.10 |
|
|
| 52 |
staff resource limitations / compressed project schedule |
31.6 |
0.10 |
|
0.20 |
| 53 |
slope stability |
31.6 |
0.50 |
0.23 |
0.01 |
| 54 |
change to design assumptions (type, size, location) for montlake cut crossing bascule bridge structure |
31.6 |
0.05 |
7.50 |
|
| 55 |
environmental compliance - known permit conditions/restrictions - unexpected permit conditions |
31.6 |
0.20 |
1.00 |
0.27 |
| 56 |
delay in completion of phase 1 work impacts phase 2 schedule |
31.6 |
0.75 |
16.88 |
6.00 |
| 57 |
market conditions: bid prices may differ from base estimate (considering uncertain contract packaging and competition)formerly labeled c-3 |
31.6 |
|
|
|
| 58 |
main contractor bankruptcy |
31.6 |
0.31 |
0.18 |
2.40 |
| 59 |
define initial enviromental impacts |
31.6 |
|
0.00 |
0.00 |
| 60 |
usace approval of ship canal crossing |
26.3 |
0.10 |
0.05 |
0.60 |
| 61 |
labor shortage |
26.3 |
0.80 |
|
0.80 |
| 62 |
construction schedule delay |
26.3 |
1.00 |
1.00 |
4.34 |
| 63 |
weather related interruptions to construction |
26.3 |
0.80 |
|
4.59 |
| 64 |
insufficient time to review and approve design leads to errors |
26.3 |
|
|
|
| 65 |
discovery of unknown below grade utilities |
26.3 |
0.35 |
0.90 |
0.66 |
| 66 |
additional work restrictions (e.g. noise, vibration, work hours) |
26.3 |
|
|
|
| 67 |
delayed city of seattle agreements |
26.3 |
0.27 |
|
0.80 |
| 68 |
wetland and aquatic habitat mitigation different than assumed |
26.3 |
|
|
|
| 69 |
uncertain settlement cost of 6(f) replacement property |
26.3 |
|
2.40 |
|
| 70 |
reinitiating of esa due to change in project conditions |
26.3 |
0.13 |
|
0.43 |
| 71 |
additional urban design/community enhancement features |
26.3 |
|
5.00 |
|
| 72 |
delays in utility agreements |
26.3 |
|
|
|
| 73 |
constructability issues associated with the west approach structure |
26.3 |
|
|
|
| 74 |
additional aquatic mitigation resources are required beyond those specified elsewhere |
26.3 |
|
|
|
| 75 |
changed assumptions for ventilation, fire life safety and other systems in the montlake lid |
26.3 |
|
11.25 |
|
| 76 |
new storm water rule - water quantity and quality issues |
26.3 |
0.00 |
|
0.00 |
| 77 |
change to design assumptions for retaining walls |
26.3 |
|
13.80 |
|
| 78 |
permits obtained by nysdot include stringent restrictions |
26.3 |
|
|
|
| 79 |
federal highway administration approval |
26.3 |
0.25 |
|
0.25 |
| 80 |
reuse and rehab existing pavement |
26.3 |
0.60 |
0.38 |
0.00 |
| 81 |
opportunity associated with the maintenance facility |
26.3 |
|
|
|
| 82 |
changed delivery method (design-build vs. design-bid-build) |
26.3 |
|
|
|
| 83 |
mechanical failure - tbm( tunnel boring machine) breakdown |
26.3 |
|
|
|
| 84 |
changes in structure and embankment |
26.3 |
0.50 |
|
0.00 |
| 85 |
known hazmat mitigation |
26.3 |
|
|
|
| 86 |
work restrictions |
26.3 |
|
|
|
| 87 |
delayed completion of noaa right of way acquisition |
26.3 |
0.25 |
|
1.50 |
| 88 |
damage to existing structures during construction (bridge, utilities, cemetery, buildings, etc.) |
26.3 |
|
1.50 |
|
| 89 |
interest rates rise just before sell bonds |
26.3 |
0.60 |
|
|
| 90 |
stakeholder requirements (usn, vma, vpa pilots, coast guard, us customs) |
26.3 |
|
|
|
| 91 |
successful state and local permit appeal lead to a delay |
26.3 |
0.64 |
|
2.80 |
| 92 |
construction delay in kg contract impacts first pontoon delivery - pontoon construction |
26.3 |
0.65 |
|
1.95 |
| 93 |
coordinating with third parties |
26.3 |
|
|
|
| 94 |
suicide prevention measures-netting |
26.3 |
|
0.86 |
|
| 95 |
bid and award process delays |
26.3 |
0.25 |
|
1.00 |
| 96 |
general uncertainty in productivity estimates / construction durations (other than captured elsewhere) |
26.3 |
1.00 |
|
|
| 97 |
need for nepa(national environmental policy act) reevaluation |
26.3 |
1.00 |
0.00 |
3.00 |
| 98 |
dredged material disposal - not to hars |
26.3 |
|
40.00 |
|
| 99 |
delay in obtaining nycdep approvals |
26.3 |
|
|
|
| 100 |
railroad involvement |
26.3 |
0.10 |
|
0.20 |