Site Clearing and Grubbing JHA (Job Hazard Analysis / Activity Hazard Analysis)
Updated 2026-06-23
A Site Clearing and Grubbing JHA (Job Hazard Analysis / Activity Hazard Analysis) is the plan that keeps the clearing crew from being struck by falling trees, rolled over on uneven terrain, or injured by the heavy equipment removing vegetation and stumps. Site clearing is the first earthwork phase on a project, and it combines tree-felling hazards with heavy equipment operating on rough, unprepared ground full of hidden obstacles. This guide walks through building a Site Clearing and Grubbing JHA that names the struck-by, rollover, and falling-tree hazards and assigns the equipment, felling, and terrain controls that hold up in the field.
Why site clearing and grubbing needs its own JHA
Clearing and grubbing removes trees, brush, stumps, and roots to prepare a site for construction. "Clearing" is the removal of surface vegetation; "grubbing" is the removal of stumps and roots below grade. The work is done with heavy equipment — dozers, excavators, mulchers, and grapples — on terrain that has not yet been prepared, so the ground is uneven, sloped, and concealing rocks, holes, and old structures. Tree felling adds struck-by hazards from falling trees and limbs. And the work often happens in remote areas of the site, sometimes near power lines running through the trees. The combination of tree-felling and heavy equipment on raw terrain justifies a dedicated JHA.
Breaking site clearing and grubbing into steps
The steps for a Site Clearing and Grubbing JHA follow the work across the site:
- Survey the area for hazards — power lines, slopes, water, structures, wildlife
- Plan the clearing sequence and equipment access
- Fell trees in a controlled manner where required
- Clear surface vegetation and brush with equipment
- Grub stumps and roots below grade
- Process, pile, and haul or chip the cleared material
- Manage terrain, slope, and concealed obstacle hazards
- Restore and stabilize the cleared ground as needed
Each step carries a hazard, and the tree felling and the equipment operation on rough terrain are where the most serious risks concentrate.
The hazards step by step
Falling trees and limbs
Felling trees and clearing standing timber exposes workers to struck-by hazards from falling trees, limbs, and "widow-makers" (hung-up limbs that fall unexpectedly). The controls are competent tree-felling technique and training where manual felling is done, planning the fall direction and escape routes, keeping workers out of the felling zone, using equipment (feller-bunchers, shears) to fell mechanically where possible to keep workers out of the strike zone, and watching for hung-up limbs and leaning trees. Power lines in the trees add electrocution risk, controlled by identifying lines and maintaining clearance.
Equipment rollover and struck-by
Heavy equipment operates on uneven, sloped, unprepared terrain, increasing rollover risk, and the equipment operates around any workers on foot. The controls are operating within the equipment's slope limits, seatbelts and rollover protective structures, operators surveying the terrain for concealed hazards, keeping workers on foot out of the equipment's operating zone, and spotters and communication where workers must be near the equipment.
Concealed obstacles and terrain
Unprepared ground conceals rocks, holes, stumps, old foundations, wells, and debris that can cause equipment to tip, get stuck, or strike a hidden hazard. The controls are surveying the area before clearing, proceeding with awareness that obstacles are hidden, and operators working at a controlled pace that allows them to react to concealed hazards.
Struck-by debris and processing hazards
Processing cleared material — chipping, mulching, grinding — throws debris and creates struck-by and entanglement hazards. The controls are guarding and safe operation of chippers and mulchers, keeping clear of the discharge and feed, and exclusion zones around processing equipment. Workers never reach into a feeding chipper.
A simple Site Clearing and Grubbing JHA structure
| Step | Hazard | Control | Standard |
|---|---|---|---|
| Survey area | Power line / hidden hazard | Identify lines, slopes, structures; maintain clearance | OSHA 1926.1408 |
| Fell trees | Struck-by tree/limb | Trained felling, fall plan, escape routes, mechanical felling | OSHA 1926.604 |
| Operate equipment | Rollover | Within slope limits, seatbelt, ROPS, survey terrain | OSHA 1926.1000 |
| Clear on raw ground | Concealed obstacle | Survey first, controlled pace, hazard awareness | OSHA 1926.604 |
| Process material | Struck-by / entanglement | Guarded chippers, clear of feed and discharge | OSHA 1926.300 |
| Workers near equipment | Struck-by | Exclusion zone, spotter, communication | OSHA 1926.601 |
Tree felling and equipment on raw terrain
A Site Clearing and Grubbing JHA addresses two hazards that define the phase: the tree felling and the equipment operating on unprepared terrain. Tree felling, whether manual or mechanical, creates a strike zone from falling trees and limbs, controlled best by mechanical felling that keeps workers out of the zone entirely, and where manual felling is necessary, by trained technique, a fall plan, and escape routes. The equipment hazard comes from operating on raw, sloped ground concealing obstacles, controlled by slope limits, seatbelts and ROPS, terrain survey, and keeping workers on foot clear. A JHA that manages the felling and the equipment-on-raw-terrain hazards covers what makes clearing the most hazardous earthwork phase.
From the field: what actually goes wrong
In fourteen years across federal, heavy civil, and industrial projects, site clearing is more hazardous than its "just knocking down trees" reputation suggests, and the serious incidents come from falling trees and equipment rollovers. The tree-felling injuries happen when workers are in the strike zone of a tree or limb that falls where it was not expected, or a hung-up limb lets go. The control that works best is mechanical felling — using a feller-buncher or shear to drop trees so no worker is in the strike zone — and where manual felling is unavoidable, trained technique with a planned fall direction and escape routes is essential. Power lines running through the trees add an electrocution hazard that the area survey has to catch before felling begins.
The equipment rollover is the other defining hazard, because clearing happens on raw, unprepared ground — sloped, uneven, and concealing rocks, holes, and old structures that can tip a machine or hide under the brush. On the projects I have run, the controls that matter are operating within slope limits with seatbelts and ROPS, surveying the area before clearing so the crew knows what is out there, and operators working at a pace that lets them react to a concealed obstacle. The processing equipment — chippers and mulchers — adds entanglement and struck-by hazards that demand guarding and exclusion zones. The JHA that keeps workers out of the felling strike zone and manages the equipment on raw terrain is the one that gets the site cleared without a fatality.
The bottom line
A Site Clearing and Grubbing JHA names the falling-tree, the rollover, and the struck-by hazards with specific controls — mechanical or trained felling that keeps workers out of the strike zone, equipment operated within slope limits with seatbelts and ROPS, a terrain survey for concealed hazards, and guarded processing equipment. Clearing is the first and one of the most hazardous earthwork phases. The JHA that manages the felling and the equipment is the one that protects the clearing crew.
Frequently asked questions
What is the difference between clearing and grubbing?
Clearing is the removal of surface vegetation — trees, brush, and standing timber — while grubbing is the removal of stumps, roots, and other material below grade. Together they prepare a raw site for construction, and both involve heavy equipment operating on unprepared terrain.
How are falling-tree hazards controlled?
The best control is mechanical felling — using a feller-buncher or shear to drop trees so no worker is in the strike zone. Where manual felling is necessary, it requires trained technique, a planned fall direction with escape routes, keeping workers out of the felling zone, and watching for hung-up limbs and leaning trees.
Why is equipment rollover a major clearing hazard?
Clearing happens on raw, unprepared ground that is sloped, uneven, and concealing rocks, holes, and old structures, all of which can tip a machine. Controls are operating within slope limits, wearing the seatbelt so the rollover protective structure works, surveying the terrain, and working at a pace that allows reacting to concealed hazards.
What hazards come from processing cleared material?
Chipping, mulching, and grinding throw debris and create struck-by and entanglement hazards. Controls are guarding and safe operation of the equipment, keeping clear of the feed and discharge, exclusion zones around the machines, and never reaching into a feeding chipper.
Related JHAs
- Heavy Equipment Operation JHA — dozers and excavators on raw terrain
- Utility Locating and Ground Disturbance JHA — locating before grubbing below grade
- Excavation and Trenching JHA — the earthwork that follows clearing
- Asphalt Paving Operations JHA — later site-work phases
Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.