# Job Hazard Analysis: Laying pipe in trench

URL: https://hardhatbinder.com/en/jha/excavation/pipe-laying
Last updated: 2026-10-23

Crew lays storm, sewer, or water pipe in an open trench dug by an excavator. Trench depth may be 4 to 20 ft. Work includes a trench box or shoring, lowering pipe with the excavator, setting bedding and grade, joining pipe, and backfilling with a plate or jumping-jack compactor. Expect soft or wet soil, buried utilities, traffic near the trench, and outdoor heat or cold.

> A general example for this task. Your JHA should reflect your crew, equipment and site — review it with a competent person before work starts.

## Steps, hazards and controls

### 1. Pre-shift check: competent person inspects trench, spoil piles, and utility locate marks

- **Hidden cracks, bulging walls, or water that can lead to a cave-in** (High): Competent person inspects the trench before anyone enters, at the start of every shift, and after rain or any change.; If there is water, cracks, sloughing, or bulging, nobody enters until it is fixed.; Pump out standing water before work starts.
- **Contact with buried gas, power, or water lines** (High): Confirm 811 locate tickets are current and marks are visible before digging.; Hand dig or vacuum excavate within the tolerance zone of marked lines.; If you smell gas or hit a line, stop, shut down equipment, and move everyone away.
- **Low oxygen or toxic gas in trenches over 4 ft deep near sewers, landfills, or fuel tanks** (Medium): Test the air with a calibrated 4-gas meter before entry and keep testing while people are inside.; Keep gas engines, pumps, and generators out of the trench and downwind.

### 2. Set the trench box or shoring, keep spoil back, and place the access ladder

- **Cave-in in trenches 5 ft or deeper without a protective system** (High): Use a trench box, shoring, or sloping chosen by the competent person for the soil type and depth.; Use the box only within the manufacturer's tabulated depth rating; keep the data sheet on site.; Never enter the trench outside the box or shoring.
- **Spoil, rocks, or tools falling from the edge onto workers** (Medium): Keep spoil piles and materials at least 2 ft back from the trench edge.; Extend the trench box above the trench edge or use a retaining barrier.
- **Falls into the trench and falls while climbing in or out** (Medium): Place an extension ladder in trenches 4 ft or deeper so no one walks more than 25 ft to reach it.; Extend the ladder 3 ft above the edge and tie it off; keep it inside the box.; Put barricades or cones around the open trench and cover holes left overnight.

### 3. Lower pipe into the trench with the excavator and rigging

- **Struck or crushed by suspended pipe or swinging bucket** (High): Inspect slings, chokers, and the bucket hook before use; remove damaged rigging.; Workers stay out of the box and clear of the load while pipe is lowered; use a tag line.; Use one designated signal person with agreed hand signals.; Never stand under a suspended load.
- **Excavator or loaded truck near the edge causing a collapse or tipping** (High): Keep equipment back from the edge as far as the competent person sets; use stop logs or barricades.; Use backup alarms and a spotter when equipment moves near workers.
- **Struck by traffic or site vehicles while working at the edge** (Medium): Set up traffic control with cones, signs, and a flagger when working near a roadway.; Wear a high-visibility vest at all times.

### 4. Place bedding stone and set grade with a laser inside the box

- **Stone dumped from the bucket landing on workers** (Medium): Workers step to the far end of the box before the operator dumps bedding.; Operator dumps only on the signal person's signal.
- **Back strain from shoveling and raking stone** (Low): Have the excavator spread most of the stone; rotate shovel work.; Lift with your legs and keep loads close to your body.
- **Laser beam in the eyes** (Low): Never look into the pipe laser; set it so the beam is not at eye level.

### 5. Join pipe sections and cut pipe to length

- **Hands or feet pinched between pipe ends or between pipe and box** (Medium): Use a come-along or pipe puller instead of pushing pipe home with the bucket when possible.; Keep hands off the bell end and away from the joint while the pipe is pushed.; Wear steel-toe boots and work gloves.
- **Silica dust when cutting concrete pipe with a cut-off saw** (High): Cut pipe outside the trench whenever possible.; Use a cut-off saw with a water feed running the whole cut.; Wear a respirator if cutting more than the allowed time or where water control is not effective.
- **Saw kickback, noise, and flying chips** (Medium): Check the blade guard and blade rating before use; never remove the guard.; Support the pipe so the cut does not pinch the blade.; Wear safety glasses, face shield, and earplugs while cutting.

### 6. Backfill and compact around the pipe

- **Carbon monoxide from a gas compactor in the trench** (High): Use an electric or battery compactor, or a compaction wheel on the excavator, in deep or narrow trenches.; If a gas compactor is used, run the 4-gas meter and leave the trench at the first alarm.
- **Vibration and noise from the jumping-jack or plate compactor** (Medium): Rotate operators about every 30 minutes.; Wear earplugs or earmuffs and anti-vibration gloves.
- **Feet crushed by the compactor or by backfill dumped from the bucket** (Medium): Stay clear of the area where the bucket dumps; dump only on signal.; Wear steel-toe boots.

### 7. Move the trench box forward, then clean up at the end of the shift

- **Caught or crushed while the box is dragged or lifted** (High): Everyone gets out of the trench before the box is moved.; Inspect box pins, spreaders, and lift points before each move.
- **Tripping over pipe, hoses, and tools; open trench left overnight** (Medium): Stack pipe on level ground and chock it so it cannot roll.; Pick up hoses, cords, and tools at the end of each shift.; Barricade or plate any open trench before leaving the site.

## Required PPE

- Hard hat — ANSI Z89.1, worn at all times on site and in the trench.
- High-visibility vest — Class 2 minimum at all times; Class 3 near roadway traffic or at night.
- Safety glasses — ANSI Z87.1 at all times; add a face shield when cutting pipe.
- Steel-toe boots — Steel or composite toe; rubber steel-toe boots in wet trenches.
- Work gloves — Leather or cut-resistant for handling pipe and rigging; anti-vibration for compactors.
- Hearing protection — Earplugs or earmuffs when running saws, compactors, or near the excavator.
- Respirator — N95 or half-face with P100 filters when cutting concrete pipe if required by the silica control plan; fit test required.

## Training

- A competent person trained to classify soil, inspect trenches, and choose protective systems must be on site.
- All crew trained in trench hazards: cave-ins, trench box use, ladder access, and atmospheric hazards.
- Excavator operators trained and evaluated on the machine they run.
- Signal person and riggers trained in hand signals, sling inspection, and safe lifting.
- Workers who cut concrete pipe trained on the silica hazard and the written exposure control plan.
- Workers using a 4-gas meter trained to bump test it and respond to alarms.

## Emergency

Cave-in: Stop all work and shut off equipment near the trench. Call 911 and give the exact site address and trench depth. Do NOT jump in to dig; rescuers can be buried by a second collapse. Keep everyone and all machines back from the edge, and meet the fire department at the entrance.

## Official sources

- [29 CFR 1926.651](https://www.ecfr.gov/current/title-29/section-1926.651) — Excavations — specific requirements
- [29 CFR 1926.652](https://www.ecfr.gov/current/title-29/section-1926.652) — Requirements for protective systems
- [29 CFR 1926.21](https://www.ecfr.gov/current/title-29/section-1926.21) — Safety training and education
- [29 CFR 1926.600](https://www.ecfr.gov/current/title-29/section-1926.600) — Motor vehicles and mechanized equipment — equipment
- [29 CFR 1926.602](https://www.ecfr.gov/current/title-29/section-1926.602) — Material handling equipment
- [29 CFR 1926.1053](https://www.ecfr.gov/current/title-29/section-1926.1053) — Ladders
- [29 CFR 1926.1153](https://www.ecfr.gov/current/title-29/section-1926.1153) — Respirable crystalline silica
- [29 CFR 1926.201](https://www.ecfr.gov/current/title-29/section-1926.201) — Signaling (flaggers)

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Source: HardHat Binder, operated by Leadspire LLC. Templates to be reviewed by a competent person before use; not legal advice; not affiliated with OSHA.