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Presentation Introduction
Information Source - ACSA Safe Trenching, Excavation and Ground Disturbance Course
Purpose Objective Primary Underlying Cause – INADEQUATE
HAZARD ID & CONTROL
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Statistics – Fatalities – Who is at Risk? 99% are males Avg Age – 35 years Highest risk group – Labourers Lowest Risk group – Managers Employees small companies – Highest Risk Employees large companies – Lowest Risk Unsupported tren/exc highest risk Supported tren/exc lowest risk
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Foundation – Company Health & Safety Program
Financial Benefits
Legal Requirements
Moral Obligations
Due Diligence
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Glossary of Terms
Angle of repose Backfill Back slopes Barricades Bell Hole Cage Cave-in Closed sheeting Confined space
Ground disturbance Excavation Kick out Open Cut Soil mass Surcharge load Trench Spoil pile
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Primary causes of accidents related to ground disturbances are:
Inadequate Hazard Assessment/Control Failure to test/classify soil conditions Failure to install safeguards Inadequate timbering/ use of defective
materials Inadequate protection for surcharge loads
Not allowing for changing weather conditions
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Hazard Assessments
What is a Hazard?
What is a Hazard Assessment?
When is a Hazard Assessment Conducted?
What Are the Control Measures?
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Common MythsCommon Myths
Myth # 1 “It is possible for a worker to out run a collapsing wall
inside a trench or excavation"Myth # 2 "Dirt smells or sounds peculiar just before it caves in"Myth # 3 “A rope tied around the waist and extended to the top of
the trench will help the rescuers find you if a cave-in occurs.
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Work Site Hazard Analysis
Who should be involved in the process?
What should be included in the analysis?
Does it need to be documented?
Should responsibilities be assigned?
What responsibilities need to be addressed?
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Site Hazard Assessment Process
Project pre-planningSource(s) of site informationSoil factors to considerNatural/Artificial HazardsStatic Loads Dynamic Loads
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Using One-Call Guidelines
Purpose Making the Call Responsibilities of Facility Owners Locate Marks Lifespan of locate marks Hand Exposure and Control Zones Fibre Optic Cables Frozen Ground Extended Work Sites
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Guidelines for Safe Construction near Pipelines
o What is a controlled area?
o What is a right-of-way?
o Your responsibilities
o Pipeline Owner Responsibilities
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Soil ClassificationSoil Classification
Hard & CompactHard & Compact
Likely to Crack or CrumbleLikely to Crack or Crumble
Soft, Sandy, or LooseSoft, Sandy, or Loose
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Factors Affecting Soil Stability
Unsupported Vertical Walls
Shock and Vibration
Freeze/Thaw Effects
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Engineered Hazard ControlsEngineered Hazard Controls
Metal Trench Boxes
Trench Shields
Pneumatic & Hydraulic Shoring Systems
Wood Shoring Systems
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Ground Disturbance PlanningGround Disturbance Planning
Safety and The Environment
Waste Management Practices & Procedures
Site Hazard Controls - Administrative
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Procedures for Excavation
Ground Conditions
Depth & Size of Pipe, etc.
Proximity of Existing Utilities and Surface
Structures
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Confined Space Entry Code of Confined Space Entry Code of PracticePractice Identification Hazards & Hazard assessments Atmospheric Testing Associated hazards Task Competencies Ventilation Personal Protective Equipment Rescue Legislative Requirements
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Environmental Protection
Environmental Assessment
Soil Management
Waste Management
Air Quality
Noise
Waterways
Emergency Response
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Emergency Response Planning (ERP)
Emergency Contacts
Designated Roles
ERP Systems Testing
Emergency Access & Egress
Buried Worker
Video/Exercise