WorksheetsExcavation Hazards
Total questions: 15
Worksheet time: 1hrs 15mins
The role of Competent Person in excavation safety is: (select all that apply)
Having required training and knowledge of soil classification
Having required training and knowledge on use of protective systems
Being able to identify hazards
Having the authority to eliminate hazards
Having the ability to terminate employees that haven't been properly trained on excavation safety
The greatest hazard to excavations is the natural ability for a trench to try to ________ itself. One cubic foot of soil weighs between ________. It will entrap, ________, or otherwise injure you.
implode, 15 - 25 pounds, suffocate
deflate, 35 - 75 pounds, pulverize
fill, 90 - 130 pounds, bury
stay open on, 300 - 450 pounds, engulf
move, 150 - 200 pounds, conceal
Never enter an unprotected trench that is ________ feet or more in depth. The competent person must first choose and implement a ________ system. Even excavations less than the minimum depth required for trench protection may need to be deemed ________ by the competent person. ________ can happen without warning.
five (5), protective, safe, Cave-ins
four (4), preventative, unsafe, Anything
six (6), provocative, worthy, Everything
ten (10), warning, available, Things
eight (8), weapons, catastrophic, Logic
What is The Theory of Shoring: (select all that apply)
Shoring prevents cave-ins
Shoring, if designed and installed correctly, prevents movement of the excavated wall.
You must stay within the protection of the shoring even when entering, working in, and exiting the trench.
Shoring is safer than not working in a trench.
It is best to use malleable metals, so that the earth impregnates its burden upon the shoring.
Make-shift, improperly designed shoring does little other than provide a false sense of security!
True
False
Type B soil or rock, shall have a maximum allowable slope, for excavations less than 20-feet, of ________?
Vertical, 90 Degree Slope
3/4 : 1 (53 Degree Slope)
1 : 1 (45 Degree Slope)
1 1/2 : 1 (34 Degree Slope)
2 : 1 (26.5 Degree Slope)
Stable rock, shall have a maximum allowable slope, for excavations less than 20-feet, of ________?
Vertical, 90 Degree Slope
3/4 : 1 (53 Degree Slope)
1 : 1 (45 Degree Slope)
1 1/2 : 1 (34 Degree Slope)
2 : 1 (26.5 Degree Slope)
Structures become ________ when earth next to them is removed. For your safety, these must be ________. A competent person must ensure precautions are ________.
saturated, drained, known
old, looked at, overlooked
stable, disturbed, handled correctly
solid, admired, preliminary
unstable, supported, implemented
As required, you should give notice to your State’s one call system, to locate any underground utilities before breaking ground. Once utility providers located known utilities, you should hand dig to find the exact location. Who do you call to notify your intentions to dig?
888
411
811
911
988
A soil pile should be a minimum of ________ feet away from the side of a trench.
one
two
three
four
five
When working below grade, ________ hazards exist. ________ must be worn in ________ due to this hazard.
electrical, Silicone gloves, mud
overhead, Hard hats, excavations
dusty, Eye protection, comfort
water, Waders, confidence
fall, Fall Arrest gear, trench boxes
Responsibilities of Employers at trench excavations must: (select all that apply)
Make sure a ladder is within 25’ of your work area when deeper than four feet.
Keep excavated dirt, rocks and other materials back two feet from the excavation’s edge.
Test and monitor the air within the trench in areas suspect to atmospheric hazards.
Must adequately train employees on the hazards of trenching excavations.
Take prompt corrective action when a hazard is identified.
Responsibilities of Employees at trench excavations must: (select all that apply)
Work defensively
Follow your company’s excavation and trenching safety rules.
Correct the hazards you are able to correct safely.
Work offensively, with wreckless abandon.
Report to your supervisor the hazards you are unable to correct.
At what depth must a ladder, ramp, steps, or runway be present for quick worker exit?
Four (4) feet
Five (5) feet
Ten (10) feet
When available to use
It is never required
Unless made in entirely stable rock, at what depth is a protective system required for a trench: (select all that apply)
Any depth if the competent person says so.
Five (5) feet deep and greater.
A protective system is never required in trenches.
When you have a canoe to paddle downstream the trench.
When type M soils are present.
