Working in Excavations and Trenches Flashcards
Excavation and Trenching work is one of the most dangerous types of construction work.
True
The fatality rate for excavation work is nearly ? that of other construction work.
Twice
What is the definition of an excavation?
any man-made cut, cavity, trench, or depression in the earth formed by earth removal.
The width of a trench is not greater than ?
15ft
Atmospheres containing less than ? oxygen must be tested.
19.5%
The presence of water in a trench or excavation heightens the possibility of ?
Wall failure
Adequate protection for water accumulation in trenches and excavations are
Special Support or Shield Systems
Water Removal Systems
Life Safety Systems
If the excavation interferes with the natural drainage of surface water ? , ? , and ? shall be employed to prevent surface water from entering the excavation.
Diversion Dikes, Ditches, other means
Excavations less than ? deep do not require a protection system if a competent person has determined there is no cave-in potential.
5’
An adequate means of exit must be provided for entering or leaving excavations when the depth is at least ? .
4’
Ladders, stairways, or ramps are permitted means of exit and entry. They must be installed so that any worker does not have to travel more than ? in a lateral direction to reach the exit.
25’
The locate paint color for electric power lines and lighting cables is ? .
red
The OSHA standards for trenching and excavations are found in 1910.269 and ? .
Select one:
OSHA 1926-650 Subpart P
Whenever excavating within ? of energized lines, digging should be done by hand or with a sucker (vacuum) truck.
5’
If an operator digs into a gas line, the safest thing to do is to fill the trench in to contain the gas leak.
False
should be left open to allow the gas to dissipate into the air
