Excavation Safety: Best Work Practices for Excavation Operations

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Excavation Safety: Best Work Practices for Excavation Operations

Excavation work poses a multitude of dangers to workers. Some of the most common injuries stem from mobile plant incidents, contact with buried services, and being hit by moving objects, but other prevalent risks include:

• Being hit by falling objects
• Slide or cave-ins
• Being trapped between stationary and moving objects

Addressing work-related injury remains crucial, emphasising why proper excavation safety measures matter for protecting workers and preventing accidents during excavation operations.

Committing to maintaining a safe workplace forms the foundation for preventing accidents and protecting workers in excavation operations, involving regular communication and consultation with workers to take their health and safety seriously.

Excavation Hazards

On June 9, 2022, a 19-year-old apprentice suffered serious injury at a residential building site in Australia when a trench he was clearing collapsed, burying him in soil. He suffered multiple fractures and had to be rescued by co-workers. This incident underscores critical importance around addressing safety issues, including the need for written safe work procedures and the significance of keeping records and reporting any workplace incidents related to safety, to enhance excavation safety. It serves as a stark reminder of dangers associated with excavation works and the paramount importance of workplace safety.

Due to the nature of this work, crews may encounter various hazards:

• Cave-ins: These rank as the leading cause of injuries and fatalities in excavation work. A cubic metre of dirt can easily match the weight of a car. Without proper shoring or benching, trenches and excavations remain at constant risk of collapse.
• Electrocutions: Underground utilities pose a constant electrocution threat. Live wires can easily be struck by tools or equipment, causing serious injury or death.
• Nasty Trench Conditions: Trenches can harbour toxic gases or chemical contamination. Pre-start atmospheric checks, gas monitors, and a buddy system can save lives.
• Equipment Hazards: Equipment failures or improper use can lead to accidents in and around excavation sites. Malfunctioning machinery can also release carbon monoxide, creating a health hazard.
• Water Hazards: Water accumulation weakens trench walls and poses drowning risks. Electrical hazards become compounded when water is present.
• Airborne Contaminants: Gas leaks from underground pipes or tanks can create dangerous breathing conditions for crews. Carbon monoxide from combustion engines in confined excavations can also prove fatal.
• Buried Contaminants: Old excavations may unearth harmful substances like asbestos or chemicals, posing inhalation and ingestion risks.
• Asbestos-Containing Material (ACM): Common in older construction materials, ACM exposure can lead to serious long-term health problems like lung cancer and mesothelioma.

When is Excavation High-Risk Construction Work?

Excavation falls under the umbrella of construction work, but specific scenarios classify it as high-risk construction work. In Australia, these scenarios include:

• Fall Hazards: Any situation where crews could fall more than 2 metres.
• Trenches and Tunnels: Work in or near the following: shafts or trenches deeper than 1.5 metres, or any tunnel regardless of depth.
• Mobile Plant Risks: The presence of mobile plant-powered machinery (excavators, loaders, etc.) when there exists a risk of collisions with pedestrians or collisions between pieces of machinery.

Important: If any of these conditions exist, strict construction regulations apply. A Safe Work Method Statement (SWMS) becomes mandatory for all high-risk work.

WHS Duties

So, who bears responsibility for ensuring that excavation work gets carried out safely? Who needs to prepare the required documentation? Duty holders responsible for overseeing safe excavation work and managing associated risks include:

Persons Conducting a Business or Undertaking (PCBUs)

A person conducting a business or undertaking (PCBU) under the WHS Act Section 19 holds the primary duty of care. PCBUs are those responsible for managing or controlling work being done. This may include employers, self-employed persons, controllers of premises, and other parties involved in a construction project.

As a PCBU, they must:

• Eliminate excavation work risks, or if not feasible, minimise them to a reasonable extent
• Manage risks related to hazardous chemicals, airborne contaminants, plant machinery, and other hazards linked to excavation work, such as trenches
• Engage workers in health and safety discussions, collaborating, consulting, and coordinating with other duty-holders where needed

Principal Contractors

As per WHS Regulations, principal contractors must prepare a WHS Management Plan outlining procedures for developing and coordinating construction projects with a budget usually of $250,000 or more. They must also prepare safe work method statements for high-risk construction work.

Principal contractors must cooperate with the PCBU in excavation work to identify hazards, assess risks, and control them. This may involve regular communication and collaboration between parties to implement safe work practices and procedures.

Designers

Designers, manufacturers, importers, suppliers, and installers of plants or structures must ensure that structures remain safe and without risks to health and safety. Their duty includes:

• Conducting testing and analysis and providing specific information about a plant or substance
• Consulting with designers and manufacturers of plants
• Ensuring the person who commissions construction work consults with a structure designer

Officers

Company directors must ensure that a project or undertaking complies with the WHS Act and WHS Regulations. This means they must:

• Ensure the company has resources and processes to comply with WHS requirements
• Monitor and review WHS performance regularly

Workers

Workers hold responsibility for taking reasonable care of their own health and safety, plus the health and safety of others in a workplace. This means employees must:

• Comply with all instructions given by an employer or supervisor
• Report any hazards or incidents that may affect health and safety
• Use provided PPE as instructed, based on information, guidance, and training an employer provides

Best Practices in Managing Excavation Hazards

Establishing and following safe work procedures for hazardous tasks proves crucial in excavation work. To manage risks mentioned above, here are measures that can be implemented to mitigate danger:

Risk Management Process

The first step in managing excavation hazards involves identifying them through a thorough risk assessment procedure. This includes breaking down an overall excavation task into basic steps and specifying personal protective equipment required for each phase. Here's a breakdown of a strong risk management process:

• Identifying the Hazards: Carefully consider specific dangers of excavation work, including cave-ins, falling objects, hazardous atmospheres, and underground utilities.
• Assessing the Risks: Analyse each hazard's likelihood and potential consequences. Consider specific conditions of your excavation site.
• Controlling the Risks: Implement control measures based on your assessment to reduce or eliminate hazards. Follow a hierarchy of controls, prioritising elimination and engineering solutions whenever possible.
• Monitoring and Reviewing: Regularly evaluate control measures. Adapt them as needed to maintain a safe work environment. This proactive approach ensures safety practices evolve alongside changing conditions on an excavation site.

Pre-Work Planning

Thorough planning forms the foundation for a safe excavation project. Before any excavation work commences, ensure you've addressed the following:

• Asbestos Assessment: If demolition or disturbance of existing structures gets involved, determine if asbestos is present. Any suspected asbestos-containing materials must be handled by a licensed professional.
• Underground Utilities: Utilise the "Before You Dig Australia" service (byda.com.au). This free resource helps pinpoint locations of underground assets, preventing accidental damage to power lines, pipes, and other critical infrastructure.

Key parts of planning include:

• Safe Work Method Statements (SWMS): A principal contractor MUST prepare a SWMS for high-risk excavation work. This document outlines site-specific hazards and control measures in place to mitigate them.
• Work Licences: Specific excavation tasks require specialised licences due to their high-risk nature. Examples include demolition, asbestos removal, high-risk work activities, and use of explosives.
• Safe Entry & Exit: Clearly defined, safe entry and exit points remain crucial for worker safety, especially during emergencies.
• Cave-in Protection: Trenches deeper than 1.5 metres require cave-in protection systems (e.g., shoring, benching) to prevent workers from being crushed by collapsing ground.
• Safe Distances from Edges: Australian regulations (e.g., WorkSafe ACT) mandate a 0.9-metre buffer between stockpiled excavated materials (spoil) and a trench edge. This prevents materials from falling back in and endangering crews.
• Barriers: Physical barriers around excavations remain vital to prevent falls by workers and members of the public.
• Water Management: Have appropriate pumping equipment on site to remove water buildup. This reduces flood and instability risks.
• Emergency Response Plan: Develop a comprehensive plan for hazards like gas leaks, cave-ins, etc. Train all crews in emergency procedures.
• Securing the Work Area: For trenches exceeding 1.5 metres in depth, an area MUST be secured against unauthorised access. This includes considering potential health hazards and the likelihood of someone intentionally or unintentionally entering a restricted zone. Securing a site becomes especially critical when working near public areas.

Information, Training, Instruction, and Supervision

Under the WHS Act, a PCBU should provide all information, training, guidance, and supervision needed to keep everyone safe at work as much as possible. This includes providing employees with necessary knowledge and understanding of risks associated with excavation work and how to use tools and equipment properly.

Employees must undergo training customised for excavation duties and site specifics by an expert. Proper licensing becomes mandatory when operating plant machinery. Supervisory roles, such as foremen, require excavation operations experience to ensure SWMS compliance.

Protective Systems

Implement protective systems such as sloping, benching, shoring, and shielding to prevent collapsing ground.

• Sloping: The slope angle should suit soil type — a lower angle for unstable soil and a steeper angle for more stable ground is sometimes acceptable.
• Benching and Battering: One straightforward way to control risk of ground collapse involves benching or battering excavation walls. This method creates a series of steps that prevent soil from sliding.
• Shoring: Positive ground support, such as metal sheets or hydraulic jacks, prevents collapse by providing lateral support to excavation walls.
• Shielding: Using trench boxes or other types of shielding equipment can physically protect crews from potential cave-ins and falling materials.

Factors for Choosing Protective Systems

• Depth of excavation: Deeper excavations demand greater protection and support.
• Soil conditions: Unstable soil or changes in soil type can increase collapse risk and require more extensive protective measures.
• Surrounding structures: Nearby buildings, utilities, and other structures must be considered when choosing a protective system to prevent damage.
• Weather conditions: Rain or other environmental factors can affect soil stability and may require additional support or adjustments to a protective system.
• Duration of the project: Short-term projects may only require temporary protective systems, while long-term ones may need more permanent solutions.

Essential Safety Equipment

Personal Protective Equipment (PPE)

While thorough planning and risk mitigation minimise excavation hazards, Personal Protective Equipment (PPE) remains a vital safeguard for workers. Here's essential gear that should be on hand at your excavation site:

• Hard hats: Protect the head from falling objects and accidental impact.
• High visibility vests: Make workers easily visible and help prevent vehicle or machinery accidents.
• Steel-toed boots: Protect feet from heavy objects or sharp materials.
• Safety glasses/goggles: Protect eyes from debris, chemicals, or other hazards.
• Gloves: Protect hands from cuts, burns, and hazardous materials.
• Hearing protection: Protect ears from loud noises that can cause hearing damage over time.
• Respirators/masks: Protect lungs and respiratory system from harmful particles or fumes.
• Fall protection equipment: Including harnesses, lanyards, and anchors to protect against falls from heights.

Barricades and Signage

Placing barricades and signage in designated areas can help prevent accidents by alerting crews of potential hazards. Proper barricades and signage should be placed in construction zones, electrical areas, and hazardous materials storage areas to ensure workplace safety.

Emergency Equipment

In addition to standard first-aid supplies, ensure the following specialised emergency equipment stays readily accessible at your excavation site:

• Harnesses and Lifelines: Essential for rapid retrieval of crews from trenches or confined spaces in case of collapse or atmospheric hazards.
• Emergency Communication: Have a reliable method for contacting emergency services, especially if a site is remote.
• Gas Detection Equipment: Vital for identifying and responding to potentially hazardous gas leaks.

Double the Protection with SafetyDocs

Are you confident that your excavation safety practices meet the highest standards? With SafetyDocs by SafetyCulture, you can ensure all necessary safety documents remain readily and easily accessible. Our comprehensive library of templates includes risk assessment, SWMS, emergency plans, and more. Plus, our products stay always up-to-date to comply with the latest safety regulations.

Check out some of our popular excavation safety templates:

• Excavation Management Plan
• Excavation Safety Inspection Checklist
• Excavation Collapse Emergency Response Plan
• Earthmoving & Mobile Plant Safe Work Method Statements (SWMS)

Don't let your excavation site become a danger zone — trust SafetyDocs to help double the protection for your crews and project site. Contact us today for personalised advice on your specific excavation safety needs.

For broader guidance on building a culture of care across your organisation, explore our fitness for work policies and procedures, or review our safe work practices guidance for manufacturing industry sites, since many principles overlap with excavation operations.

Our team of experts remains dedicated to providing accurate and informative content. Craig Cruickshank, our senior HSEQ advisor at SafetyDocs by SafetyCulture, has reviewed this blog post to ensure the highest level of quality.

Learn more about Craig's work on LinkedIn for further industry insights.

Available for instant download and supplied in fully editable MS Word format for use in your business.

Please note that the above information is provided as a comment only and should not be relied on as professional, legal or financial advice.

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