risk asses 12-coastal cliff
TRANSCRIPT
RISK ASSESSMENT FORM
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Location: Terga Date of Assessment: 17- 09 - 2009 Assessment No: Rev - 012
Assessor(s): Biman Modak System/Activity: Coastal Cliff
Pro
bab
ili
ty&
Fre
qu
en
cy
Definite 5 5 10 15 20High 4 4 8 12 16
Moderate 3 3 6 9 12
Low 2 2 4 6 8
Negligible 1 1 2 3 41 2 3 4
Minor Serious Major Catastrophic
Severity
Key to Priorities
Medium Priority (5 days) High Priority (2-3 days) Immediate
INTRODUCTION
The table below provides a simplified representation of the methodology used and the processes involved in this Hazard Identification & Risk Analysis Procedure (RiskManagement) to be undertaken by OCIA and all Subcontractors in order to initiate, act on, review and effectively manage project-related risks throughout the ConstructionPhase.
IDENTIFICATION - Pre planning , Methodstatement , Job safety analysis.
ASSESSMENT – Impact, Risk factor,Mitigation measure, Residual risk
IMPLEMENTATION &COMMUNICATION
REVIEW & UP DATE
Identify activities , Identify hazards Assess Impacts, Analyze Risk ,Establish Mitigation Measures.
Communication & Training Audit, Inspection & Up dating of Log.
RISK ASSESSMENT FORM
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Hazards Identified (include the exposed groups) Probability
1 - 5
Severity
1 - 4
Risk
1 - 20Control Measures to be Implemented Probability
1 - 5
Severity
1 - 4
Risk
1 - 20Residual
RiskDate ActionCompleted
General concept about cliff. 3 2 6All cliffs are, of course, subject to attack bythe elements, but the effects of that attackwill depend very much on the geologicalmake-up of the cliffs and the degree of theirexposure. The hard granite cliffs of corn wallare very slow to erode despite their constantpounding by large waves. The cliffs areformed from London clay and softsandstone. As a result erosion can be rapid.Reducing ground water pressure is possiblythe single most important factor in improvingslope stability. While we cannot stop rainfalling from the sky we can stop it soakinginto the ground by means of shallowdrainage (porous pipes, rubble filledchannels etc.) which lead the water awayfrom vulnerable areas. Shallow drains can beeasily seen on large areas of the bay cliffs.
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RISK ASSESSMENT FORM
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Cliff protection by draining, pumpingsystem.
3 2 6Deep horizontal drains take the water out ofthe zone where a slip is most likely to occurand make the clay stronger and less likely tofail. Pumps take the water out of the mainshaft and discharge it to the sea. In certainareas where the sandstone / clay interface ishigh enough we could be able to drill deepvertical drains through the potential slipsurface into the sandstone and allow groundwater to drain away naturally without the aidof pumps.
The way of stopping the see-saw moving isto restrain it by putting a prop underneath itor by tying a rope to it. A direct equivalent isimpossible in soil mechanics but it is possibleto introduce horizontal metal or plastic gridsthrough the slip circle which help to reinforcethe soil in the same way that steel barsreinforce concrete.
Rock armour is large rocks piled or placed atthe foot of dunes or cliffs with native stonesof the beach. This is generally used in areasprone to erosion to absorb the wave energyand hold beach material.
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Cliff stabilization. 3 3 9Cliff stabilization can be accomplishedthrough drainage of excess rainwaterthrough terracing, planting, and wiringto hold cliffs in place.
The installation of the meshes themselvesinvolves excavating the area, laying themeshes and then reinstating the ground, sothis technique is best suited to small areaswhich have the potential to slip.
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RISK ASSESSMENT FORM
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Safe access / egress . Work inside theconfined space.
3 3 9 All access routes to remain clear and freefrom obstructions.Area to be kept tidy at all times.Adequate access ladders with fall arrestsystem installed.A pre tested and certified man basket andscaffolding to be used to access difficultareas.
Man basket to be checked daily by acompetent person prior to use.The man basket must be checked each timeit is attached to the crane.Shackles are secured and pinned.Shackles and rings are not deformed andpad eyes are not damaged.Slings and rings in good condition.Handrails are in good condition.Floor plating and kick plates are in goodcondition. A healthy working atmosphere hasto be maintained inside the confined spacekeeping appropriate exhaust / opening topass out logged , entrapped welding gases.Adequate lighting arrangement has to beprovided at the work place.
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Assessor Print : BIMAN MODAK Sign: Date: 17- 09 - 2009