Digging Deep: Safeguarding Against Trench Cave-Ins
Are your workers well-versed in trench and excavation safety protocols? Trenching accidents cause many deaths and lost work days every year. Even if you don’t have workers who work inside trenches or excavations, you might have a contractor or vendor who may be working in one that your workplace has oversight of.
In spring 2024, OSHA fined an employer $275,000 because a worker entered an excavation without adequate safeguards to prevent its collapse. Tragically, the worker sustained fatal injuries when the trench wall collapsed, trapping him under tons of dirt against a reinforced concrete structure.
Furthermore, OSHA stated the employer failed to:
- Have a person ready to provide first aid on location,
- Offer a ladder for a swift exit,
- Require employees to work in a water-soaked excavation, and
- Incorrectly employ a reinforced concrete box for excavation protection.
Having a competent person inspect an excavation and ensure workers can make safe entry is critical to a successful excavation safety program.
What does the competent person look for?
According to OSHA, a jobsite’s competent person must inspect all excavations each day for evidence of a situation that could result in:
- Possible cave-ins,
- Indications of failure of protective systems,
- Hazardous atmospheres, and
- Other hazardous conditions.
However, all workers working in trenches/excavations should know much of the same information as the competent person. Why? A sudden change could mean disaster for them and their fellow workers.
What are unsafe conditions?
Some of the things that could cause an immediate change at an excavation site are:
- A bulldozer or excavator coming too close to a trench could cause a surcharge (overloading) and stress cracks at or near the edge of the trench,
- A sudden downpour could fill the trench or cause rain-soaked soil to give way, or
- Accidentally striking an underground utility line with a tool could present immediate electrocution or hazardous atmosphere hazards.
These are just a few sudden incidents that need immediate attention and decision-making. That’s why the OSHA rules require jobsites to train workers in recognizing and avoiding unsafe conditions, the regulations applicable to the work environment, and control or eliminate any hazards or other exposure to illness or injury.
What do OSHA’s regulations cover?
OSHA’s excavation rules apply to all open excavations made on the earth’s surface, including trenches. The regulation is in the construction standards at 1926.650-.652 and covers:
Scope and application—The rule applies to all open excavations on the earth’s surface. Excavations are defined to include trenches.
Specific excavation requirements—These include surface hazards, underground utilities, getting in and out of the excavation, traffic hazards, hazardous atmospheres, emergency rescue, inspections, and fall protection.
Requirements for protective systems—The rule says each worker in an excavation must be protected from cave-ins by an adequate protective system designed per the OSHA regulations for:
- Sloping and benching systems, or
- Support, shield, and other protective systems.
Exceptions would be when:
- Excavations are made entirely in stable rock; or
- Excavations are less than five feet deep, and examination of the ground by a competent person does not indicate a potential cave-in.
Excavations are among the most dangerous places in construction work. Workers’ knowledge of the hazards and constant vigilance could save their lives or deaths.
Key to remember
Workers should be as knowledgeable about trench and excavation safety as the competent excavation inspector so they can recognize hazards and take appropriate actions to protect themselves.