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Trenching and Drainage Excavation Risk Assessment

This risk assessment covers trenching and drainage excavation, including planning, excavation, service exposure, pipe work and emergency response.

Activities covered include

  • Plan work, locate services and set up the area
  • Work near exposed underground services
  • Inspect conditions and prepare for emergencies

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If your client or principal requests changes during document review, BlueSafe will help revise the document at no extra cost and support resubmission until it is accepted.

Trenching and Drainage Excavation Risk Assessment
  • 100% Compliant with Australian WHS Acts & Regulations
  • Fully Editable MS Word & PDF Formats Included
  • Pre-filled Content - Ready to Deploy Immediately
  • Customisable - Easily Add Your Logo & Site Details
  • Includes 2 Years of Free Compliance Updates

Product Overview

This risk assessment covers trenching and drainage excavation, including planning, excavation, service exposure, pipe work and emergency response. It supports planning and risk management by identifying hazards from collapse, underground services, plant movement, water ingress, falls and public access.

Activities & Risks Covered

This assessment addresses activities and risks including:

  • Plan work, locate services and set up the area
  • Manage excavation collapse and ground instability
  • Operate mobile plant during excavation
  • Manage access, egress and falls around trenches
  • Work near exposed underground services
  • Manage water ingress, drainage and atmospheric hazards
  • Lay pipes, prepare bedding and backfill
  • Manage public access, adjacent structures and site security
  • Inspect conditions and prepare for emergencies

Who is this for?

Suitable for contractors, workers, supervisors and businesses carrying out trenching and drainage excavation activities.

Activities & Hazards Covered

Activity Potential Hazards
Planning, locating services and setting up the work area
  • Striking underground electrical, gas, water, sewer or communications services
  • Unauthorised entry into the excavation area
  • Poor site layout creating vehicle and pedestrian interaction
  • Unidentified ground conditions or nearby structures affecting excavation stability
Excavation collapse and ground instability
  • Trench wall collapse burying or trapping workers
  • Engulfment from loose or saturated material
  • Ground movement caused by vibration, plant loading or adjacent traffic
  • Failure of unsupported faces during entry or inspection
Plant operation and excavation with mobile equipment
  • Workers struck by excavators, loaders, trucks or other mobile plant
  • Plant rollover near trench edges
  • Collision between plant, pedestrians and delivery vehicles
  • Unplanned movement during reversing or slewing
Access, egress and falls around the trench
  • Workers or others falling into the trench
  • Slips and trips at the excavation edge
  • Delayed escape during an emergency
  • Injury while climbing in or out of the trench
Underground services exposure and work near live assets
  • Electric shock, arc flash or fire from underground electrical assets
  • Gas release, explosion or asphyxiation from damaged gas lines
  • Flooding, contamination or service interruption from damaged water or sewer lines
  • Hand digging or trimming contacting live services
Water ingress, drainage and atmospheric hazards
  • Water build-up causing trench collapse or engulfment
  • Low oxygen, gas, vapours or engine exhaust collecting in the excavation
  • Exposure to contaminated water, sewerage or mud
  • Heat stress and reduced visibility in poorly ventilated excavations
Pipe laying, bedding, backfilling and work inside the trench
  • Crush injuries from pipes, pits, shoring components or lifting gear
  • Workers caught between loads and trench walls
  • Musculoskeletal injury from manual handling, awkward postures and hand tools
  • Contact with moving plant during lowering or backfilling
Public interface, adjacent structures and site security
  • Members of the public entering the work area
  • Falling objects or trench edge failure affecting adjoining areas
  • Damage to nearby buildings, pavements, roads or services
  • Vehicle intrusion into the excavation zone
Emergency response, inspection and changed conditions
  • Delayed rescue following collapse, service strike or atmospheric incident
  • Workers re-entering an unsafe trench after rain or overnight changes
  • Inadequate communication during an incident
  • Missing defects in shoring, barriers or access arrangements

Need to tailor this risk assessment?

Use the BlueSafe Portal to add site-specific activities, hazards, controls, responsibilities and review details before the assessment is put into use.

Acceptance Guaranteed: If your client or principal requests changes during document review, BlueSafe will help revise the document at no extra cost and support resubmission until it is accepted.

Legislation & References

The template records model guidance used to inform the documented controls. Applicable WHS/OHS laws and adopted Codes vary by state or territory, so confirm the current local requirements when tailoring the assessment:

  • Model guidance: Model Code of Practice: Excavation work — 2.3. Controlling the risks; p. 17.
  • Model guidance: Model Code of Practice: Managing the risk of falls at workplaces — 3.2 Identifying the hazards; p. 16.
  • Model guidance: Model Code of Practice: Construction work — 6.2 Workplace specific induction training; p. 41.
  • Model guidance: Model Code of Practice: Hazardous manual tasks — 4.1 The hierarchy of control measures; p. 31.
  • Model guidance: Model Code of Practice: Managing electrical risks in the workplace — 5. Isolation, locking off and access; p. 34.
  • Model guidance: Model Code of Practice: First aid in the workplace — 3. First aid equipment, facilities and training; p. 12.
  • Model guidance: Model Code of Practice: Managing the work environment and facilities — 2. The work environment; p. 13.
  • Model guidance: Model Code of Practice: Managing risks of plant in the workplace — Plant used to lift or suspend persons or things; p. 17.
  • Model guidance: Model Code of Practice: How to manage work health and safety risks — 5. Step 4 — How to review controls; p. 27.
Standard Risk Assessment Features (Click to Expand)
  • Activity-specific hazard identification and control measures
  • Initial and residual risk ratings
  • Assigned responsible persons for each activity
  • Risk matrix and assessment classification
  • Review, monitoring and sign-off fields
  • Site-specific customisation before use

Suitable for Industries

Building and ConstructionCivil Construction and EarthworksPlumbing and Gasfitting

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