Dig It or Miss It? The Ultimate Excavator & Heavy Engineering Masterclass

Excavating a trench deeper than 1.5m without shoring is MOST hazardous in which soil class?

40%

Correct!

Incorrect!

According to OSHA standards, Type C soil (such as loose gravel, sand, or wet mud) has zero cohesive strength and is highly unstable, registering the highest level of life-threatening trench cave-ins.

Excavating a trench deeper than 1.5m without shoring is MOST hazardous in which soil class?

Highly stable firm cohesive clay (Type A)

Hard unweathered solid granite bedrock

Deeply frozen polar permafrost ground

Loose gravel, dry sand, or muddy silt (Type C)

40%