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Best Practice Excavations

Best Practice Excavations. Agenda -. Introduction Statistics Excavations - Best Practices Question Period. Presentation Introduction. Information Source - ACSA Safe Trenching, Excavation and Ground Disturbance Course Purpose Objective

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Best Practice Excavations

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  1. Best Practice Excavations

  2. Agenda - Introduction Statistics Excavations - Best Practices Question Period

  3. Presentation Introduction • Information Source - ACSA Safe Trenching, Excavation and Ground Disturbance Course • Purpose • Objective • Primary Underlying Cause – INADEQUATE HAZARD ID & CONTROL

  4. 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

  5. Foundation – Company Health & Safety Program • Financial Benefits • Legal Requirements • Moral Obligations • Due Diligence

  6. 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 Glossary of Terms

  7. 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

  8. Hazard Assessments • What is a Hazard? • What is a Hazard Assessment? • When is a Hazard Assessment Conducted? • What Are the Control Measures?

  9. Common 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.

  10. 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?

  11. Site Hazard Assessment Process • Project pre-planning • Source(s) of site information • Soil factors to consider • Natural/Artificial Hazards • Static Loads • Dynamic Loads

  12. 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

  13. Guidelines for Safe Construction near Pipelines • What is a controlled area? • What is a right-of-way? • Your responsibilities • Pipeline Owner Responsibilities

  14. Agenda – Filling & Compacting

  15. Soil Classification • Hard & Compact • Likely to Crack or Crumble • Soft, Sandy, or Loose

  16. Factors Affecting Soil Stability • Unsupported Vertical Walls • Shock and Vibration • Freeze/Thaw Effects

  17. Types of Slope Failures • Wedge Slide • Slab Slide • Circular Slide • Toppling Slide

  18. Soil Terminology • Cemented • Fissured • Cohesive • Granular

  19. Engineered Hazard Controls • Metal Trench Boxes • Trench Shields • Pneumatic & Hydraulic Shoring Systems • Wood Shoring Systems

  20. Ground Disturbance Planning • Safety and The Environment • Waste Management Practices & Procedures • Site Hazard Controls - Administrative

  21. Procedures for Excavation • Ground Conditions • Depth & Size of Pipe, etc. • Proximity of Existing Utilities and Surface Structures

  22. Confined Space Entry Code of Practice • Identification • Hazards & Hazard assessments • Atmospheric Testing • Associated hazards • Task Competencies • Ventilation • Personal Protective Equipment • Rescue • Legislative Requirements

  23. Legislation Review • Employer • Worker • Prime Contractor • Serious Accidents • Non- Compliance

  24. Environmental Protection • Environmental Assessment • Soil Management • Waste Management • Air Quality • Noise • Waterways • Emergency Response

  25. Inspections • What is an Inspection? • Inspection Policy • On-going & Formal Inspections

  26. Emergency Response Planning (ERP) • Emergency Contacts • Designated Roles • ERP Systems Testing • Emergency Access & Egress • Buried Worker • Video/Exercise

  27. Closeout • Questions? • Course evaluations • Clean up your station

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