soil types & trenching safety
which soil type has the highest stability
type A
What is the max distance a worker can be from an egress in a trench?
25 Feet
where should heavy equipment be positioned near a trench
at least the depth of the trench away
What machine is best for digging trenches?
Excavator
What is the first step before starting heavy equipment?
what is the primary danger of type C soil
most likely to collapse
How high must a trench ladder extend above the landing?
3 Feet
which PPE is required inside a trench
hard hat, high-visibility vest, steel-toe boots
A grader is primarily used for what?
Leveling and finishing surfaces
Which is NOT a safe practice?
Exceeding equipment's load limit
when soil is layered, how should it be classified
least stable layer present
What is the max slope angle for type C soil?
34 Degrees
what is a safe practice when working in a trench
using a ladder that extends 3 feet above
What is the main function of a backhoe?
Excavating and lifting
what should an operator do before leaving the machine.
turn it off, set parking brake, lower attachments.
what is NOT a trench protection method
digging deeper
What is the purpose of a trench box?
Reinforce trench walls
what conditions require a trench to be re-evaluated
all of the above- rain, heavy equipment nearby, soil changes.
Which loader is best for tight spaces?
Skid steer
what is best for stability when lifting a heavy load with an excavator.
keep the load close and low to the ground.
what depth requires a protective system in a trench
5 feet
When should a trench be inspected?
Before each shift and after stability-affecting events
what should an operator do if they lose sight of a worker
stop movement until worker is located.
What does a compactor do?
Press soil to increase density
what is the proper response to a backup alarm on equipment.
stay clear and ensure the operator sees you.