Safety, Occupational Health, and Environmental Protection
Safety, Occupational Health, and Environmental Protection
This domain tests hazard recognition and control before and during excavation. Expect questions on exclusion zones, utility strikes, spoil placement, PPE, silica and diesel exposure, spill response, and waste handling.
Core rules
- Complete a site risk assessment and mark the swing radius, track path, and pedestrian exclusion zone.
- Call the one-call utility locate service before digging; hand-dig within the marked tolerance zone.
- Keep spoil and materials at least 2 ft (0.6 m) from a trench edge under OSHA 1926 Subpart P; keep equipment outside the zone of influence.
- Wear hard hat, hi-vis, safety boots, and eye/hearing protection. Use respiratory protection for silica when cutting or sweeping dust.
- Refuel away from drains and water; use drip pans and a spill kit; segregate oily waste, filters, and batteries.
- Never work under a raised attachment. For service, lower it, stop the engine, lock out, and relieve hydraulic pressure.
- Control diesel particulate and heat: keep cab filters clean, close windows in dust, and manage work/rest cycles.
Worked example
A 1.5 m trench is planned beside a marked water main. The marking is 0.8 m from the trench wall. Reasoning: 0.8 m may be inside the local tolerance zone, so machine digging is not acceptable there. Use hand tools and a spotter within the tolerance zone, keep the excavator on the opposite side, and stockpile spoil at least 2 ft from the edge. If the main is damaged, stop, evacuate, and call the utility.
Traps
- Trusting ROPS without the seatbelt; neither protects in a rollover alone.
- Assuming rubber tracks insulate against buried electrical cables.
- Piling spoil at the edge 'just for a minute.'
- Ignoring dust because the cab has a filter.