# Job Hazard Analysis: Foundation excavation URL: https://hardhatbinder.com/en/jha/excavation/foundation-excavation Last updated: 2026-10-23 Digging a foundation hole or footing trench with a tracked excavator or backhoe, then hand-finishing the bottom so footings can be formed. Covers locating utilities, digging, protecting workers from cave-ins (sloping, benching, or trench box), entering the excavation, and securing the site at end of day. A competent person must be on site and inspect the excavation daily and after rain or other changes. Excavations 20 ft or deeper need a protective system designed by a registered professional engineer. > 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. Plan the dig: call 811, mark utilities, and pick the protective system - **Hitting buried gas, electric, water, or fiber lines** (High): Call 811 before digging and wait for all utilities to respond and mark the ground.; Walk the site with the competent person and check that paint and flags match the plans.; Hand-dig or vacuum-excavate to expose lines inside the tolerance zone before using the bucket. - **Cave-in from wrong soil type or no protective plan** (High): Have the competent person classify the soil (Type A, B, or C) before digging.; Choose sloping, benching, or a trench box rated for the depth before work starts. If in doubt, treat soil as Type C. - **Overhead power lines in the excavator's reach** (High): Locate overhead lines and keep the boom at least 10 ft away from lines up to 50 kV.; Call the utility to de-energize or cover the lines if you can't keep clearance, and assign a dedicated spotter. ### 2. Set up the site: barricades, traffic control, and equipment check - **Workers or public struck by trucks and equipment** (High): Set cones, fence, or barricades to keep people out of the work zone.; Plan one-way haul routes and use a spotter when trucks back up.; Wear a high-visibility Class 2 vest at all times. - **Equipment failure from bad brakes, hydraulics, or backup alarm** (Medium): Do the pre-shift walk-around on the excavator and loader: tracks, hoses, leaks, horn, backup alarm, seat belt.; Tag out any machine with a defect and don't run it until repaired. ### 3. Dig the foundation with the excavator and place spoil - **Struck or crushed by the excavator swing or bucket** (High): Mark the swing radius with cones or tape and keep everyone outside it.; Make eye contact and get a signal from the operator before walking near the machine.; Never stand under a loaded bucket or near a truck being loaded. - **Spoil pile or equipment collapsing the edge** (High): Keep spoil, materials, and equipment at least 2 ft back from the edge.; Keep heavy equipment back from the edge or use stop logs so wheels and tracks can't roll in. - **Loud engine noise** (Medium): Keep cab doors and windows closed while operating.; Wear earplugs or earmuffs when working near running equipment. ### 4. Install the protective system: slope, bench, or set the trench box - **Cave-in while the protective system is going in** (High): Set and adjust the trench box from outside the excavation; nobody goes in until it is in place.; Cut slopes and benches to the angle the competent person set for the soil type.; Use only trench boxes with the manufacturer's tabulated data on site and don't exceed rated depth. - **Pinch points and swinging loads when rigging the trench box** (Medium): Inspect chains and shackles before lifting; use tag lines to guide the box.; Keep hands off the box while it moves and wear work gloves. ### 5. Inspect and enter the excavation - **Cave-in from water, cracks, or changed conditions** (High): The competent person inspects before each shift, after rain, and after any change. Look for cracks, bulges, water, and sloughing.; Pump out standing water before entry; get out right away if you see the walls move. - **Falling while climbing in or out** (Medium): In excavations 4 ft or deeper, place a ladder within 25 ft of every worker.; Extend the ladder 3 ft above the edge, tie it off, and face the ladder with 3 points of contact. - **Bad air (low oxygen or fumes) in deep or low areas** (Medium): Test the air with a gas monitor before entry in excavations over 4 ft where bad air could build up, like near landfills, fuel tanks, or sewer lines.; Keep gas-powered pumps and compactors out of the hole or vent the exhaust away. ### 6. Hand-finish the bottom and lay out footings - **Struck by the bucket while working near it in the hole** (High): Stop the machine and lower the bucket to the ground before anyone works within its reach.; Use one person to give signals to the operator. - **Back strain from shoveling and lifting forms** (Medium): Let the machine do the heavy cuts and use the bucket to lower forms and rebar.; Rotate shovel work and lift with your legs; get help for loads over 50 lb. - **Heat or cold stress in the hole** (Medium): Provide cool water, shade, and rest breaks; give new workers time to get used to the heat.; Watch each other for dizziness, cramps, or confusion and report it right away. ### 7. Secure the site at end of day and clean up - **Workers or public falling into the open excavation** (High): Put up fence or barricades around the whole excavation before leaving.; Cover or barricade any wells, pits, or shafts.; Use guardrails or fall protection on walkways over excavations 6 ft or deeper. - **Trips on tools, hoses, and loose debris** (Low): Pick up tools, coil hoses, and keep walkways clear.; Park equipment away from the edge, bucket down, keys removed. ## Required PPE - Hard hat — ANSI Z89.1, worn at all times on site. - High-visibility vest — Class 2 or higher, at all times around equipment and traffic. - Safety glasses — ANSI Z87.1, at all times. - Steel- or composite-toe boots — Waterproof work boots for wet holes. - Work gloves — Leather or cut-resistant for shoveling, rigging, and handling forms. - Hearing protection — Earplugs or earmuffs when near running excavators, compactors, or pumps. ## Training - Competent person trained in soil classification, protective systems, and excavation inspection. - Excavation hazard awareness for all crew: cave-in signs, safe entry, and ladder use. - Operators trained and authorized on the specific excavator, backhoe, or loader. - Hand signals and spotter training for workers guiding equipment. - Fall protection training for anyone working at excavation edges 6 ft or deeper. - Heat illness prevention and first aid/CPR for at least one person on site. ## Emergency If there is a cave-in: stop all equipment and call 911 right away. Give the site address and say it is a trench collapse. Do NOT jump in to dig out a buried worker; more soil can fall. Keep everyone and machines back from the edge, and send someone to the road to guide rescue crews. If a utility line is hit, shut down, move everyone away, and call 911 and the utility. ## 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 1926.600](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 1926.21](https://www.ecfr.gov/current/title-29/section-1926.21) — Safety training and education - [29 CFR 1926.1053](https://www.ecfr.gov/current/title-29/section-1926.1053) — Ladders - [29 CFR 1926.501](https://www.ecfr.gov/current/title-29/section-1926.501) — Duty to have fall protection - [OSHA](https://www.osha.gov/heat-exposure) — Heat — hazard recognition and prevention --- Source: HardHat Binder, operated by Leadspire LLC. Templates to be reviewed by a competent person before use; not legal advice; not affiliated with OSHA.