Excavation Competent Person Duties

An excavation competent person is someone designated by the employer who is capable of identifying existing and predictable hazards in excavation and trenching operations - and who has the authority to take prompt corrective measures to eliminate them. Under OSHA's 29 CFR 1926 Subpart P, every excavation site must have a competent person present. Failure to designate one is among the most frequently cited violations in the construction industry, carrying penalties that can exceed $16,000 per instance.

This guide breaks down exactly what a competent person does on an excavation site, what qualifications they need and how to ensure your program satisfies OSHA requirements from the first shovel strike to the final backfill.

What Is an OSHA Competent Person?

OSHA defines a competent person as an individual who is capable of identifying existing and predictable hazards in the surroundings or working conditions that are unsanitary, hazardous or dangerous to employees - and who has the authorization to take prompt corrective measures to eliminate them.

This definition appears in multiple OSHA standards, but it carries particular weight in excavation work under Subpart P. The competent person for excavation must have specific knowledge of soil analysis, protective systems and the hazards unique to below-grade work.

Key elements of the OSHA competent person definition:

• Capability: They must possess the training and knowledge to recognize hazards
• Authority: They must have the employer-granted power to stop work and correct hazards immediately
• Presence: They must be on-site during excavation activities

The competent person is not just an advisor. They are the frontline decision-maker responsible for worker safety in and around the excavation.

Competent Person Duties in Excavation

The duties of an excavation competent person span the entire lifecycle of the excavation - from planning through backfill. Here is a detailed breakdown of each responsibility.

Soil Classification

Before any protective system is selected, the competent person must classify the soil at the excavation site. OSHA recognizes four soil categories:

• Stable Rock: Natural solid mineral matter that can be excavated with vertical sides and remain intact
• Type A: Cohesive soils with an unconfined compressive strength of 1.5 tons per square foot (tsf) or greater - such as clay, silty clay and hardpan
• Type B: Cohesive soils with an unconfined compressive strength between 0.5 and 1.5 tsf - such as angular gravel, silt and soils that are fissured or subject to vibration
• Type C: Cohesive soils with an unconfined compressive strength of 0.5 tsf or less - including granular soils like gravel, sand and loamy sand, plus submerged or freely seeping soils

The competent person uses at least one visual test and one manual test to classify the soil. Common manual tests include the thumb penetration test, the pocket penetrometer test, the ribbon test and the dry strength test. Visual tests include examining the excavation spoil pile, looking for signs of previously disturbed soil, checking for water seepage and noting surface cracking.

Daily Inspections

The competent person must inspect the excavation, adjacent areas and protective systems before the start of each shift, after every rainstorm or other hazard-increasing occurrence and as needed throughout the shift. These inspections cover:

• Condition of trench walls and evidence of cave-in potential
• Effectiveness of protective systems (sloping, shoring, shielding)
• Water accumulation and dewatering equipment function
• Air quality in excavations deeper than 4 feet where oxygen deficiency or hazardous atmospheres could exist
• Proximity of heavy equipment and vibration sources
• Condition and placement of access and egress points
• Location of underground utilities

Documenting these inspections is critical for demonstrating compliance during OSHA visits. Using a digital document management platform allows competent persons to log findings instantly and attach photos as evidence.

Selecting Protective Systems

For excavations 5 feet or deeper (or shallower if conditions warrant), the competent person must select the appropriate protective system. Options include:

• Sloping: Cutting the excavation walls back at an angle to prevent collapse. The required angle depends on soil type - from 53 degrees for Type A to 34 degrees for Type C
• Benching: Creating steps in the excavation wall. Benching is not permitted in Type C soil
• Shoring: Installing support structures (timber, hydraulic or pneumatic) to brace the excavation walls
• Shielding: Using trench boxes or shields to protect workers inside the excavation without supporting the trench walls

The competent person must ensure the selected system is properly installed, maintained and adequate for the soil conditions and depth of the excavation.

Monitoring Hazardous Atmospheres

When an excavation is deeper than 4 feet and there is a reasonable possibility of atmospheric hazards, the competent person must ensure atmospheric testing is performed before workers enter. Hazards include:

• Oxygen-deficient atmospheres (below 19.5%)
• Flammable gases and vapors
• Toxic gases such as hydrogen sulfide or carbon monoxide

If hazardous conditions are detected, the competent person must implement controls - such as ventilation or respiratory protection - before allowing entry, or remove workers from the excavation immediately.

Managing Access and Egress

In trenches 4 feet or deeper, the competent person must verify that a means of egress (ladder, ramp or stairway) is available within 25 feet of lateral travel for every worker in the excavation. Ladders must extend at least 3 feet above the edge of the trench.

Controlling Surface Hazards

The competent person is also responsible for managing hazards at the surface, including:

• Keeping spoil piles at least 2 feet from the edge of the excavation
• Ensuring barriers or barricades protect workers from falling objects and vehicular traffic
• Verifying that underground utilities have been located and marked before digging begins
• Preventing water accumulation in the excavation that could undermine walls

Competent Person Qualifications

OSHA does not prescribe a specific certification or course for the excavation competent person. However, the individual must demonstrate:

• Knowledge of OSHA excavation standards (29 CFR 1926 Subpart P)
• Ability to classify soil using visual and manual tests
• Understanding of protective system design and installation
• Familiarity with atmospheric testing equipment and procedures
• Practical experience in excavation and trenching operations

Many employers send competent person candidates through formal training programs offered by OSHA Training Institute Education Centers, equipment manufacturers or third-party safety training providers. While this training is not legally mandated, it provides documented evidence that the individual meets the competency requirements - which is valuable during enforcement proceedings.

For a deeper look at excavation safety fundamentals, see our complete excavation and trenching safety guide.

Common Violations Related to the Competent Person

OSHA's trenching and excavation standards consistently rank among the agency's top 10 most-cited standards. Many of these citations relate directly to the competent person role:

No Competent Person Designated

Some employers assume a foreman or superintendent automatically fills this role. That is incorrect. The competent person must be formally designated and must possess the required knowledge and authority.

Competent Person Not On-Site

The competent person must be physically present during excavation activities. Designating someone who is at a different jobsite or in the office does not satisfy the standard.

Failure to Conduct Daily Inspections

Inspections are required before each shift and after any hazard-increasing event. Skipping inspections - even on a day when conditions appear unchanged - is a citable offense.

Inadequate Authority

If a competent person identifies a hazard but lacks the authority to stop work, the employer has not met the standard. The competent person must be able to shut down the operation immediately without seeking additional approval.

No Documentation

While OSHA does not explicitly require written inspection records in Subpart P, the agency expects employers to demonstrate that inspections were conducted. Without documentation, it becomes the employer's word against the compliance officer's observations.

Best Practices for Competent Person Programs

Going beyond minimum compliance strengthens your excavation safety program and reduces liability. Consider these best practices:

• Document everything: Use digital inspection forms that capture dates, times, soil conditions, protective systems and corrective actions taken
• Train multiple people: Having only one competent person creates a single point of failure. Cross-train several team members so excavation work can proceed safely even when personnel change
• Conduct refresher training: Annual or semi-annual refresher courses keep competent persons current on regulatory changes and reinforce critical skills
• Empower the role: Make it clear to all workers and supervisors that the competent person has absolute authority to stop work. Reinforce this in toolbox talks and safety meetings
• Use standardized checklists: Pre-built inspection templates reduce the chance of overlooking a hazard during time-pressured assessments

Strengthen Your Excavation Safety Program

The excavation competent person is the cornerstone of trenching safety. By clearly defining their duties, investing in proper training and supporting them with digital documentation tools, you build a program that protects workers and withstands regulatory scrutiny.

Make Safety Easy gives your competent persons the tools they need to conduct inspections, manage documentation and maintain compliance from the trench to the office. Book a demo to see how it works, or check out our pricing to get started today.