BIG MAN RETIREMENT STUDY DECK Flashcards
OH NO GROUND FAILURE 1 HAS HAPPENED WHAT IS THE ACTION LIST (IMMEDIATE ACTION PLAN)?
- stop work
- headcount
-secure entire site area including unaffected zones that may still be at risk - contact worksafe in accordance with section 68 of workers compensation act
- document the scene (photos, statements, site survey, report)
- hold a site coordination meeting with (geotech, super, safety buddy)
- create task force to create remediation plan
- contact farmer and other stakeholders that may be impacted
Ground #1 - WHAT IS THE SHORT TERM PLAN
- place temporary shoring or berms along toe of failure to stabilize wall
- determine cause of failure (borehole or test pits, reviewing original borehole data)
- determine liability for failure
(insurance, owner, contractor / DB entity, geotech) - plan to leave failed existing materials and walls in place to finish preload duration
- install dewatering and surface drainage
- monitoring systems for ground water or settlement
- execute remediation plan
ground failure #1 WHAT IS THE LONG TERM PLAN
- quantify damages
- sum up incurred costs resulting
- prepare a claim
ground failure #1 and #2 - what are some options for recovering costs?
- file a claim against the owner
- identify an underlying cause attributed to another party (inadequate design, poor workmanship for construction, oversight or lack of due diligence on the part of others)
- file a ground failure claim with insurance (not typical)
ground failure #1 and #2 - who is liable? (who generally pays)
Liability typically rests with owner for unforeseen ground failure because:
1) No fault if all parties did their due diligence
2) More thorough geotechnical investigations could have always been done
(This is a risk reward that the owner takes on when pricing geotechnical work)
In rare cases, the owner or contractor may have taken out a Ground Failure insurance policy
1) Not typical, although was the case for this incident
2) Likely insurance company would seek to recover costs if due diligence wasn’t followed
3) Insurance company may still attempt repayment through legal action
ground failure #1 and #2 - global vs internal failure
- Failure area: Internal failure is limited to the wall, Global is the entire area
- fault: Wall design to blame for internal, soil conditions for global
- Type: Wall fails due to shear or overturning moment, global fails in circular slip plane
ground failure #1 and #2 - risk distribution
1) Proper design, construction, following of specifications and regulations
2) Based on borehole information provided
3) Proper due diligence by general contractor, designer, and construction
a. Due to uncertainty in geotechnical
b. Claim against owner as they retain liability for unforeseen events
4) If errors in construction or design
a. Partial or full liability shifts to the responsible party
ground failure #2 - what are the costs incurred
1) Lost profit due to delays (hard to prove on linear work schedule projects)
2) Repair to impacted property such as fences, ground thrust, or damaged culverts
3) Stabilization costs, such as dewatering or soil berms
4) Remediation costs, general labour and material costs to restore failed structure
5) Geotechnical investigation work, such as test pits, reports, boreholes, expertise
6) Survey Costs to document scene and quantify impact
7) Improvement Costs, such as over excavation or soil densification
8) Other costs such as fines, additional staffing, or hours for meetings, consulting fees
Westgate - Describe the details and the significance of the three geofab tests conducted
Contact test with no restraint (GOOD):
-GEOFAB held back significant portion of soil particles and was able to maintain head difference of 218 cm
Contact test with vertical restraint (GOOD):
-GEOFAB filter allowed slight passage of fines and filter was able to maintain a head difference of at least 210 cm
Unconfined Test (BAD):
-1 cm gap present, upward flowing water liquefied soil and a significant portion of particles passed through the GEOFAB
Westgate - what are the causes of failure?
a) Drainage pipe location
used to control level of water table below road, placed at springline instead of crown
b) GEOFAB Contact Condition
3 tests, unconfined test, no vertical restraint, vertical restraint, (unconfined FAILED)
c) Poor Supervision of Construction
bros stopped inspecting due to CoSt, smith and associates said see ya to GE inspectors
Westgate - What’s the relevance of the GEOFAB information given?
GEOFAB is relevant in making two recommendations:
1. Criteria available to Lisa on which she could have based her recommendations regarding GEOFAB
2. The actual performance of the GEOFAB as a soil filter for the soil encountered at the failure sites
Westgate - Who is at fault and why?
LISA IS AT FAULT BY 100% STUPID BITCH FAG
-should have insisted on adequate data
-even if contractor appears to have experience, she needed to provide clear, detailed written instructions to insure that proper installation techniques were followed
-should have insisted on inspecting all sections of trench
Westgate - what lessons are to be learned?
-diary should be kept
-log all important telephone conversations
-don’t give technical advice over the phone
-confirmation and clarification of decisions and agreements in writing
-good communication essential
-explain why you are requiring details to be followed
Progress Curves
Cumulative estimated job costs VS construction time
a) One Early Start Curve
b) One Late Start Curve
Total Cost & Budgeted cost Plotted Monthly
Cost Envelop is created from present to end of job
Earned Value Management System (EVMS)
Compared the physical work accomplished to date with the actual cost expenditure and planned work
yet to be accomplished. This 3-Dimensional comparison determines the earned value on a project and
forms the basis for a more accurate projection of final project cost.
Benefits of earned value management system
An Earned Value Management System combines the actual cost of work completed with the planned
value of that work to generate a projection and determine whether a project is on track and on budget.
This provides project managers with a more accurate and comprehensive view of the project’s progress
over using a simple progress curve, which only shows the amount of work completed over time.
The Three Variables BCWP, BCWS, and ACWP
Budgeted Cost of Work Performed (BCWP)
Cumulative budgeted value of all work activities performed to date.
Budget Cost of Work Scheduled (BCWS)
Cumulative planned value of all the work activities to be accomplished in the baseline
schedule to date.
Actual Cost of Work Performed (ACWP)
Cumulative cost for work completed to date OR current cost of work
Cost Variance (CV)
CV = BCWP - ACWP
Schedule Variance (S)
SV = BCWP - BCWS
Cost Performance Index (CPI)
CPI = BCWP / ACWP
