Excavation & Trenching Competent Person Training — OSHA 1926 Subpart P Online Certification
What Is This Excavation Competent Person Course?
This online excavation and trenching competent person course teaches the full skill set OSHA requires under 29 CFR 1926 Subpart P and Appendices A through F. Over 11 self-paced modules, workers and supervisors learn to classify soil in the field, select the right cave-in protective system, manage spoil piles and surcharge loads, conduct daily inspections, and recognize the atmospheric, water, and access hazards that govern every dig.
The course includes interactive soil classification exercises, trench diagrams, spot-the-hazards scenes, field decision scenarios, and embedded videos from Mid-America Safety & Environmental — so learners arrive on the job with practical skills, not just knowledge of regulations.
What You Will Learn — 11 Module Breakdown
Module 1 — OSHA 29 CFR 1926 Subpart P: Scope & Overview
Establish the legal and regulatory foundation for all excavation work. Covers why excavation is one of OSHA's most dangerous construction hazards, the three sections of Subpart P (.650 scope, .651 specific requirements, .652 protective systems), the five-foot rule, and how the course is structured around practical field decisions.
Module 2 — Key Definitions: Excavation, Trench, Protective System & Competent Person
Master the Subpart P vocabulary — the terms that drive every field decision. Covers the legal definitions of excavation vs. trench, the competent person and registered professional engineer distinction, acceptable engineering practices, confined space triggers in excavations, and the full definitions of each type of protective system. Terms learned here apply to every subsequent module.
Module 3 — Soil Mechanics: Why Trenches Fail & How to Prevent It
Understand the physics behind cave-ins before learning to prevent them. Covers the six failure modes (tension cracks, sliding, toppling, subsidence, heaving, boiling), why 5- to 15-foot trenches are the deadliest depth range, the three available protective systems, underground utility location requirements (811, color codes, soft-dig procedures), and overhead power line clearance rules.
Module 4 — Soil Classification: Types A, B, and C
Learn to classify the four OSHA soil types from the Appendix A criteria. Covers the unconfined compressive strength thresholds, visual and physical characteristics of each class, conditions that disqualify Type A classification (fissuring, water seepage, prior disturbance), the weakest-layer rule for layered strata, and a worked classification exercise. Correct soil classification determines every downstream decision about protection.
Module 5 — Field Testing: Penetrometer, Shearvane & Visual Tests
Learn to use the tools that turn soil classification from guesswork into a defensible decision. Covers the pocket penetrometer and shearvane (how to take readings, what readings mean, how to convert to soil type), the thumb test, the dry-strength test, the visual inspection workflow, and a step-by-step competent-person workflow from arriving at the cut to selecting a protective system. Includes a practice instrument-reading exercise.
Module 6 — Shoring & Trench Boxes: Selecting the Right Protective System
Understand how shoring and trench box systems work and when to use each one. Covers the anatomy of a shoring system (wales, uprights, cross braces, screw jacks), timber shoring installation sequence (top-down) and removal sequence (bottom-up), hydraulic shoring advantages and types (hydraulic cylinders, pneumatic shores, spot bracing), trench box and shield specifications (gap between shield and trench, backfill requirements, the 2-foot shield rating rule), and Appendices E and F for alternative systems and the selection path.
Module 7 — Sloping, Benching & Tabulated Data
Apply slope and bench geometry correctly for any soil type. Covers maximum allowable slopes by soil class (3/4:1 for Type A, 1:1 for Type B, 1.5:1 for Type C, vertical for stable rock), compound slopes through layered soils, the 20-foot RPE ceiling for unsupported slopes, benching configurations and dimension rules, and how to read and apply manufacturer tabulated data — including a worked example with slope calculations and a tabulated-data chart exercise.
Module 8 — Spoils & Surcharge Loads: The 2-Foot Setback Rule
Manage the pile at the edge — the most commonly overlooked excavation hazard. Covers the OSHA 2-foot spoil setback rule (measured from the base of the pile to the edge of the excavation), downhill placement requirements, runoff and erosion control, surcharge loads from nearby equipment and material stockpiles, and the competent person's pre-dig checklist with the key numbers every worker on the site must know.
Module 9 — The Competent Person: Role, Inspection Authority & Stop-Work Power
Understand the full legal weight and field responsibilities of the competent person designation. Covers the six areas the CP owns (soil classification, protective system selection, inspections, stop-work authority, water response, atmospheric oversight), required inspection frequency (before each shift, after rain or other hazard-increasing events, as needed), the distinction between competent person, qualified person, and registered professional engineer, and field decision scenarios that test stop-work judgment.
Module 10 — Special Considerations: Atmospheres, Water, Access & Vehicle Hazards
Cover the hazards beyond the cave-in that kill workers every year. Ingress and egress requirements (the 4-foot ladder trigger, structural ramps, stairways, surface crossing rules), vehicle and falling-object hazards at the trench edge, hazardous atmospheric conditions (oxygen limits, the gases commonly found in excavations, the 4-gas monitor workflow, engineering and administrative controls), water accumulation and emergency rescue requirements, and the eight danger signs that require immediate action.
Module 11 — Course Summary & Review: Six Rules, Key Numbers & Final Scenarios
Consolidate everything before the certification exam. The six core rules that govern every excavation decision, the key numbers every worker must know (5-foot rule, 2-foot setback, maximum slopes by soil type, 20-foot RPE ceiling, oxygen limits), and a final review using the whole-course framework. Followed by the certification exam prep and course conclusion.
Who Should Take This Trench Safety Training?
This course is designed for:
- Construction workers who enter, work beside, or supervise work in or around excavations and trenches
- Supervisors and foremen being trained or designated as the competent person for excavation work
- Safety managers needing to document compliant OSHA Subpart P training for their crews
- Contractors in underground utilities, site development, pipeline, and general construction
- Anyone working near excavations who needs to recognize cave-in hazards and stop-work authority
What You Get When You Complete This Course
- A certificate of completion issued after passing the exam at 70% or higher
- Knowledge of all four soil types, field testing methods, and the weakest-layer rule for layered strata
- The ability to select and apply timber shoring, hydraulic shoring, trench boxes, sloping, or benching based on soil type and depth
- Understanding of the 2-foot spoil setback rule, surcharge load management, and the numbers every worker on the dig must know
- Competent person inspection skills — what to inspect, when to stop work, and what triggers reclassification
- Self-paced, mobile-friendly access on any device — progress auto-saved so you can complete in multiple sessions
What Does the Competent Person Role Require Under OSHA?
Under 29 CFR 1926.651 and .652, every excavation must have a competent person — someone with the knowledge to classify soil, identify hazards, and select a protective system, AND the authority to stop work when conditions become unsafe. This is not an optional designation. No competent person on site means the excavation cannot legally proceed.
This course covers everything the competent person must be able to do: classify soil using field tests, choose between sloping, benching, shoring, and trench box systems, conduct pre-shift and as-needed inspections, respond to water accumulation and atmospheric hazards, and exercise stop-work authority without delay. Module 9 is dedicated entirely to the role.
Course Format, Duration & Certification
11 self-paced online modules • ~4 hours • certificate on completion • annual refresher
Frequently Asked Questions About Trench Safety Training
Q: What is OSHA's trench safety standard?
A: OSHA's trench safety standard is 29 CFR 1926 Subpart P, which includes sections .650 (scope), .651 (specific requirements for excavations), and .652 (requirements for protective systems). Appendices A through F provide the soil classification criteria, tabulated data, timber shoring specifications, alternatives, and the system selection path. Any excavation 5 feet or deeper requires a protective system unless solid rock. Excavations 20 feet or deeper require a protective system designed by a registered professional engineer.
Q: What does a competent person for excavation need to know?
A: Under OSHA 29 CFR 1926 Subpart P, the competent person must be capable of: classifying soil in the field using visual and manual tests; selecting an appropriate protective system (sloping, benching, shoring, or trench box) based on soil type and depth; conducting pre-shift, daily, and as-needed inspections; identifying and eliminating hazardous conditions; and exercising stop-work authority without delay. The competent person must be on site whenever workers are in the excavation.
Q: When is a trench box required by OSHA?
A: A protective system — which can be a trench box, shoring, sloping, or benching — is required for any excavation 5 feet or deeper when the excavation is not made entirely in stable rock. A trench box (also called a trench shield) is one protective option. The competent person selects the appropriate system based on soil classification, depth, and site conditions. For excavations 20 feet or deeper, the system must be designed by a registered professional engineer.
Q: What are OSHA soil types A, B, and C?
A: OSHA classifies soil into four categories under Appendix A to 1926 Subpart P. Stable Rock is natural solid mineral material that can be excavated with vertical sides. Type A is the most stable cohesive soil with an unconfined compressive strength of 1.5 tons per square foot or greater — examples include clay and silty clay, but only if not fissured, subject to water seepage, or previously disturbed. Type B soil has a strength of 0.5 to 1.5 tsf. Type C is the least stable, with strength under 0.5 tsf, including granular soil, soil subject to water seepage, and previously disturbed soil. When soil layers are mixed, the entire excavation is classified by the weakest layer.
Q: How deep can you dig without shoring?
A: Any excavation 5 feet or deeper requires a protective system unless made entirely in stable rock. Excavations less than 5 feet deep still require a protective system if the competent person determines that hazardous ground movement could occur. There is no depth at which an excavation is automatically safe without assessment by the competent person — even shallow trenches in unstable soil require protection.
Q: What is the spoil pile setback rule for trenches?
A: Under OSHA 1926.651(j)(2), spoil (excavated soil) must be kept at least 2 feet from the edge of the excavation, measured from the base of the spoil pile to the edge of the cut. This prevents the weight of the spoil from adding a surcharge load to the trench wall, which can accelerate failure. Equipment and other materials stored near the excavation must also be kept back far enough that their surcharge load does not affect wall stability — the competent person determines the safe distance.
Q: What are hazardous atmospheres in excavations?
A: Excavations can accumulate hazardous gases, including oxygen-deficient air (below 19.5%), oxygen-enriched air (above 23.5%), flammable or combustible gases, and toxic substances like carbon monoxide, hydrogen sulfide, or sewer gas. Under 1926.651(g), the competent person must test for hazardous atmospheres whenever oxygen deficiency or a hazardous atmosphere exists or could reasonably be expected. A 4-gas monitor is the standard tool. If a hazardous atmosphere is detected, work stops, the area is ventilated, and workers do not re-enter until the atmosphere is safe.
Q: How often does excavation safety training need to be renewed?
A: OSHA does not specify a fixed renewal interval for excavation training, but the course recommends an annual refresher. Retraining is also required when workers change duties or worksites, when new equipment or hazards are introduced, or after an incident or near-miss. Competent persons should retrain any time their classification skills or knowledge of protective systems needs to be refreshed. Annual retraining is the industry standard and the recommendation of Mid-America Safety & Environmental.
Excavation & Trenching Competent Person Training $70 Enroll Today
