National Trench Safety Month — Week 4 Training Series

The Competent Person: The Most Important Role on a Trench Site

Trench safety depends on more than equipment, rules, and written procedures.

It depends on someone being able to recognize hazards before workers are exposed to them.

That is why the competent person plays such an important role on an excavation site.

A trench can change quickly. Soil can shift. Water can collect. Spoil piles can add pressure near the edge. Equipment can create vibration. Protective systems can be used incorrectly. Conditions that looked acceptable in the morning can become unsafe later in the day.

The competent person is the individual responsible for identifying those hazards and having the authority to take corrective action.

In Weeks 1, 2, and 3 of Iron Lot’s National Trench Safety Month training series, we covered trench hazards, OSHA trench safety basics, and protective systems such as trench boxes and shoring.

Week 4 focuses on the role that ties those topics together.

The competent person.

What Is a Competent Person?

Under OSHA construction standards, a competent person is someone who is capable of identifying existing and predictable hazards in the surroundings or working conditions and who has authorization to take prompt corrective measures to eliminate them.

OSHA excavation standards are found in 29 CFR 1926 Subpart P. The general OSHA construction definition of competent person is found in 29 CFR 1926.32.

On a trench site, that means the competent person must be able to recognize excavation hazards and take action before workers are placed in danger.

That role requires both knowledge and authority.

A person cannot be considered competent for trench safety simply because they have jobsite experience, seniority, or a title.

The competent person must be able to identify hazards and must have the authority to stop work, remove workers from the excavation, correct unsafe conditions, or require additional protective measures when needed.

Why the Competent Person Matters

Trench hazards can become serious very quickly.

A trench wall may show signs of movement. Water may begin collecting in the excavation. A spoil pile may be placed too close to the edge. A ladder may be missing or positioned too far away. A trench box may not match the soil conditions, depth, or configuration shown in the manufacturer tabulated data.

These issues may not always be obvious to every worker on the crew.

The competent person is responsible for recognizing these hazards and making sure corrective action is taken.

This role helps protect workers by connecting training, inspection, planning, and jobsite authority.

OSHA Competent Person Requirements for Excavation Work

For excavation work, OSHA places several responsibilities on the competent person, including inspection duties, hazard recognition, soil-related decisions, and corrective action.

A competent person may be involved in decisions related to:

• Excavation inspections
• Soil classification
• Protective system selection
• Water accumulation
• Access and egress
• Spoil pile placement
• Hazardous atmospheres
• Signs of possible cave-ins
• Indications of protective system failure
• Changing conditions during the shift

The competent person is not just observing the job. The competent person must be able to identify hazards and take action.

Inspection Responsibilities

Inspection is one of the most important competent person responsibilities on a trench site.

Under 29 CFR 1926.651, daily inspections of excavations, adjacent areas, and protective systems must be made by a competent person for evidence of conditions that could result in possible cave-ins, protective system failure, hazardous atmospheres, or other hazardous conditions.

The inspection should look for conditions that could result in:

• Possible cave-ins
• Failure of protective systems
• Hazardous atmospheres
• Water accumulation
• Loose soil or falling material
• Equipment too close to the trench edge
• Spoil piles placed too close to the excavation
• Missing or improper access and egress
• Damaged trench boxes, spreaders, pins, or shoring components
• Other hazardous conditions

Inspections should take place before workers enter the excavation.

They should also be repeated as needed throughout the shift.

A trench is not automatically safe for the entire day just because it was inspected in the morning.

Changing Conditions Require New Review

Excavation conditions can change during the day.

A competent person should reassess the trench when conditions change or when a hazard-increasing event occurs.

Examples include:

• Rain
• Water entering the excavation
• Soil cracking or sloughing
• Vibration from traffic or equipment
• Equipment moving closer to the edge
• Changes in trench depth or width
• New spoil piles or materials near the excavation
• Utility conflicts
• Changes to the protective system
• Workers moving to a different area of the trench
• Any sign of trench wall movement or instability

Changing conditions should never be ignored.

If conditions become unsafe, workers should be removed from the excavation until the hazard is corrected.

Hazard Identification on a Trench Site

A major part of the competent person’s role is hazard identification.

Common trench hazards include:

• Cave-ins
• Unstable soil
• Previously disturbed soil
• Water accumulation
• Spoil piles too close to the edge
• Heavy equipment near the excavation
• Vibration from traffic or machinery
• Falling material
• Utility hazards
• Poor access and egress
• Improper protective system use
• Damaged protective equipment
• Workers outside the protected area

Hazard identification is not a one-time task.

It should happen before work starts, during the shift, and whenever site conditions change.

Protective System Review

The competent person should review whether the selected protective system is appropriate for the job.

OSHA’s protective system requirements are addressed in 29 CFR 1926.652.

For trench boxes, this may include reviewing:

• Trench depth
• Soil classification
• Water conditions
• Box size and configuration
• Spreader setup
• Manufacturer tabulated data
• Depth ratings
• Visible damage
• Worker position inside the protected area

For shoring systems, the competent person should confirm that the system is suitable for the excavation and installed according to the applicable requirements, manufacturer information, or engineered design.

A protective system should not be selected based on convenience alone.

It must fit the excavation.

Manufacturer Tabulated Data

Manufacturer tabulated data is an important part of trench box and protective system use.

Every trench box Iron Lot sells comes with manufacturer tabulated data that includes depth ratings and a registered professional engineer stamp.

That does not mean every trench box is appropriate for every excavation.

The competent person should review the tabulated data and confirm that the trench box is being used within its limitations.

This includes reviewing the soil conditions, depth, configuration, spreader setup, and any use restrictions.

Tabulated data should be available to the crew and reviewed before workers enter the trench.

Authority to Take Corrective Action

A competent person must have authority.

That authority matters because trench safety decisions often require immediate action.

Corrective action may include:

• Removing workers from the trench
• Stopping work
• Repositioning spoil piles
• Moving equipment away from the edge
• Providing proper access and egress
• Correcting ladder placement
• Replacing damaged components
• Adjusting or changing the protective system
• Reinspecting after conditions change
• Getting additional engineering or manufacturer guidance when needed

A competent person who can identify hazards but cannot take action is missing a critical part of the role.

Common Mistakes to Avoid

Even when a competent person is assigned, problems can occur if the role is not taken seriously.

Common mistakes include:

• Treating the competent person role as just a title
• Failing to inspect before workers enter
• Not reinspecting after rain or changing conditions
• Ignoring water accumulation
• Assuming one trench box works for every job
• Not reviewing manufacturer tabulated data
• Allowing workers outside the protected area
• Letting spoil piles remain too close to the trench edge
• Allowing equipment to operate too close to the excavation
• Failing to remove workers when unsafe conditions exist

The competent person must be active, observant, and willing to take corrective action.

Questions Crews Should Ask

A good trench safety discussion should include practical questions. Ongoing Trench Safety Training reinforces this knowledge for all workers, not just the competent person.

Before workers enter an excavation, crews should be able to answer:

• Who is the competent person on this job?
• Has the excavation been inspected today?
• Have conditions changed since the inspection?
• What soil conditions are present?
• What protective system is being used?
• Has the manufacturer tabulated data been reviewed?
• Are workers staying inside the protected area?
• Is safe access and egress provided?
• Are spoil piles and equipment kept back from the edge?
• What conditions would require us to stop work?

These questions help turn trench safety from a checklist into a jobsite habit.

Key Takeaways

The competent person is one of the most important roles on a trench site.

Key points to remember:

• The competent person must be able to identify existing and predictable hazards.
• The competent person must have authority to take corrective action.
• Excavations, adjacent areas, and protective systems must be inspected.
• Inspections should happen before work and as needed during the shift.
• Changing conditions require new review.
• Protective systems must match the excavation conditions.
• Manufacturer tabulated data must be reviewed and followed.
• Workers should be removed from unsafe excavations.
• Trench safety depends on daily attention, not assumptions.

A safe trench starts with planning, inspection, communication, and the authority to stop work when conditions are unsafe.

Because every worker deserves to go home.

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