Free Excavation & Trench Inspection Checklist

The daily excavation inspection, done the way it holds up

Trench collapses kill workers in the time it takes to climb a ladder. A cubic yard of soil weighs about as much as a pickup truck, and a wall that looks fine at 7 a.m. can let go at 2 p.m. after a rain shower, a loaded dump truck parked too close, or a morning of vibration from a plate compactor. The daily competent-person inspection is the control that catches those changes. This guide walks through what OSHA actually requires, how to use the free Excel checklist above, and the mistakes that show up in citations and fatality reports year after year.

What OSHA requires: 1926.651(k)

Subpart P of 29 CFR 1926 covers excavations. The inspection rule is short and specific:

• Who: a competent person — capable of identifying existing and predictable hazards, with authority to take prompt corrective measures (1926.650(b)).
• What: the excavation, the adjacent areas, and the protective systems — looking for possible cave-ins, failure of protective systems, hazardous atmospheres, or other hazardous conditions.
• When: daily, prior to the start of work, as needed throughout the shift, and after every rainstorm or other hazard-increasing occurrence.
• Then what: if the competent person finds evidence of any of those conditions, exposed employees are removed from the hazardous area until the necessary precautions are taken (1926.651(k)(2)).

OSHA doesn't prescribe a form. What it looks for after an incident is evidence that a qualified person looked, what they found, and what they did. A dated, signed checklist with the soil classification, the protective system and the conditions noted is that evidence. The after-rain inspection is the one most often missing from a file — the template's log tab has a trigger column for exactly that reason.

Step 1 — Classify the soil (Appendix A)

Everything downstream depends on soil type. Appendix A to Subpart P requires classification based on at least one visual and at least one manual test, done by the competent person. The template records both.

Two field rules from experience. First, almost nothing in utility work is Type A — you're usually digging next to, or through, backfill from the last utility, and previously disturbed soil can't be Type A. Second, reclassify when conditions change (Appendix A (c)(5)). The trench that was Type B at 7 a.m. with water seeping in at 2 p.m. is Type C. The template's log shows that exact example so crews see what a reclassification entry looks like.

Step 2 — Pick and check the protective system (1926.652)

At 5 feet or deeper — and shallower if the competent person sees any sign of a potential cave-in — every exposed worker needs protection (1926.652(a)(1)). The four families:

• Sloping. Without classifying, 1-1/2 horizontal to 1 vertical (34°) — the Type C slope — always works (Option 1). With classification, Appendix B allows 3/4:1 for Type A, 1:1 for Type B, 1-1/2:1 for Type C, for excavations 20 feet deep or less.
• Benching. Allowed in cohesive Type A and B soils following the Appendix B configurations — never in Type C.
• Shoring. Hydraulic, timber or screw-jack systems per manufacturer tabulated data, Appendix C (timber) or Appendix D (aluminum hydraulic), or an engineer's design.
• Shielding (trench boxes). Per the manufacturer's tabulated data, which must be on site. Boxes don't prevent a cave-in — they protect the people inside it.

The template calculates the Appendix B maximum slope for the soil type you choose, the top width you'd need if you simple-slope both walls, and how far from centerline the spoil toe has to stay once you add the 2-foot setback. For our 8-foot, Type B example with a 3-foot bottom: 3 + 2 × 8 × 1 = 19 feet across the top, and spoil no closer than 11.5 feet from centerline. Those two numbers are why most contractors box a utility trench instead of sloping it in town.

Trench box checks that belong on every inspection:

• Tabulated data on site and matching the box, the depth and the soil type.
• No more than 2 feet of excavation below the bottom of the box, and only if the box is rated for the full depth and there's no sign of soil loss from behind or below it (1926.652(g)(2)).
• Box restrained against lateral movement; nobody inside while it's installed, removed or moved vertically (1926.652(g)(1)).
• Workers enter and exit inside the protection — the ladder is in the box, not in the unprotected end.
• No cracked welds, bent spreaders, or missing pins.

For the deeper sloping and benching configurations, layered soils and the short-term Type A exceptions, use our OSHA soil classification and sloping chart alongside the checklist.

Step 3 — Access and egress

Trenches 4 feet or deeper need a stairway, ladder, ramp or other safe means of egress within 25 feet of lateral travel (1926.651(c)(2)). The template turns trench length into a minimum count of egress points — one per 50 feet, rounded up — but place them where people are working, not just evenly spaced. The ladder also has to meet the ladder rules: side rails extending 3 feet above the landing surface or secured with a grab device (1926.1053(b)(1)).

Step 4 — Spoil, edges, equipment and traffic

• Spoil, materials and equipment at least 2 feet back from the edge, or retained (1926.651(j)(2)).
• Loose rock or soil on the face scaled or barricaded (1926.651(j)(1)).
• Warning system — barricades, stop logs, hand signals — where mobile equipment works near the edge and the operator can't see it (1926.651(f)).
• Nobody under loads handled by lifting or digging equipment (1926.651(e)).
• High-visibility garments for workers exposed to public traffic (1926.651(d)).
• Walkways to cross the excavation, with guardrails where the walkway is 6 feet or more above the lower level (1926.651(l)).
• Fall protection at the edge of excavations 6 feet or deeper that aren't readily seen because of plant growth or another visual barrier, and covers or barricades at wells, pits and shafts (1926.501(b)(7)).

Step 5 — Water

Water is the most common hazard-increasing occurrence. Nobody works in a trench with accumulated or accumulating water unless precautions are in place — special support or shield systems, water removal, or a harness and lifeline (1926.651(h)(1)). If you're pumping, the competent person monitors the dewatering (h)(2), and surface runoff has to be diverted away from the cut (h)(3). Log the rain event, what you found, and whether you pulled the crew out — that is the entry that protects you later.

Step 6 — Atmosphere

Where oxygen deficiency or a hazardous atmosphere exists or could reasonably be expected — landfills, fuel or chemical storage nearby, sewer tie-ins, gas mains — test before anyone enters an excavation deeper than 4 feet (1926.651(g)(1)(i)). The limits in the standard: oxygen not below 19.5%, and flammable gas kept at or below 20% of the lower flammable limit. Keep testing while ventilation is relied on, and keep rescue equipment (harness and line, basket stretcher, breathing apparatus) available and attended where hazardous atmospheres are possible (1926.651(g)(2)). Many company programs alarm at 10% LEL — if yours is stricter, use it. The log tab flags any reading below 19.5% O₂ or above 20% LEL automatically.

Step 7 — Adjacent structures and utilities

Call 811 and wait out the response time; locate marks tell you the estimated location only. As you approach the marks, find the exact location by safe means — hand digging or vacuum excavation (1926.651(b)(3)) — and support or protect exposed lines (b)(4). Adjacent buildings, walls and poles whose stability is endangered need shoring, bracing or underpinning (1926.651(i)(1)), and you can't dig below a footing unless it's underpinned, in stable rock, or an engineer has approved it (i)(2).

How to use the Excel template

1. Daily Inspection tab. Fill in the header, depth, width, length and soil. The gold cells are inputs; bold navy cells calculate. The "what the rules require" block tells you, for this dig, whether a protective system is required, how many egress points you need, the maximum slope, and whether atmosphere testing is triggered.
2. Walk the 35-item checklist. Every item carries its OSHA reference. Answer Yes, No or N/A. One "No" turns the status bar to STOP with the 1926.651(k)(2) reminder to remove exposed workers.
3. Correct, re-inspect, sign. Write the corrective action next to the item, record the time you cleared the excavation, and sign.
4. Inspection Log tab. One line per inspection — start of shift, during shift, after rain. Egress, protective-system and atmosphere flags calculate from depth, soil and meter readings.

Common excavation inspection mistakes

Inspecting once and calling it a day

The rule says before work, as needed during the shift, and after every rain or hazard-increasing event. A single morning entry on a day it poured at noon is a gap.

Calling it Type A because it's clay

Clay next to a road, under a previous utility, or with visible fissures isn't Type A. When unsure, classify Type C — every system rated for C works in A and B.

Egress outside the box

A ladder at the open end of the trench, outside the shield, means workers walk out of the protected zone to leave. Put the ladder in the box.

Digging too far below the box

The 2-foot allowance only applies when the box is rated for the full depth and the soil isn't running out from under it.

Spoil at the edge

The excavator operator piles spoil where it's convenient. Two feet is the minimum — and the surcharge from a tall pile can overload a wall rated for the soil alone.

Beyond paper: excavation inspections in Field PM

A clipboard in the truck works until the inspection you need is the one nobody can find. Field PM's safety module puts the daily excavation inspection on the competent person's phone with photos, timestamps and signatures, attaches it to the daily report, and keeps every after-rain entry on the record. Build it from our form library or your own checklist. Start a free 30-day trial.

Related free safety tools

• OSHA soil classification & sloping chart — Appendix A and B at a glance
• JSA template — plan the trenching task before the dig
• Jobsite safety inspection checklist — the weekly site-wide walk
• Equipment inspection checklist — excavator and loader pre-use checks
• Crane lift plan — when a box, manhole or pipe is set by crane
• All free construction templates

This checklist organizes OSHA requirements for convenience; it isn't legal or engineering advice. Verify citations against the current 29 CFR 1926 Subpart P and any stricter state-plan rules.