Excavating the Trench Flashcards
To provide support for the sides of trenches, workers could use ? .
Benching
Shoring
Sloping
Material or debris shall not be placed within ? of an open trench in which a man can work.
36” or 3’
As referenced, OSHA (1926.650)(a)(I)(ii) states, “excavations less than ? do not require a protection system if the competent person has determined there is no cave-in potential.”
5’
Ladders or suitable ramps are to be used for entering or leaving trenches when the depth is ? or more.
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’
Soil weighing 100 pounds per cubic foot will have a cubic yard weight of ? .
2700 lbs 1 cubic yard = 27 cubic foot
A natural soil material that can be excavated with vertical sides and will remain intact while exposed would be classified as ? .
stable rock
? is a term that means that the sides of the trench are excavated to form one or a series of horizontal levels or steps, usually with vertical or near-vertical surfaces between the levels.
Benching
? is a protective system that protects employees within excavations and trenches by excavating the sides of the trench or excavation to form sides that slope away from the excavation to protect against cave-ins.
Sloping
When shields are used in trenching excavations, the excavation of the earth is permitted to a level not greater than ? below the bottom of the shield.
2’
? is a support system that utilizes a structure such as a metal hydraulic, mechanical, or timber shoring system that supports the sides of an excavation to prevent cave-ins.
Shoring
The appropriate procedures for performing soil classification tests can be found in ? .
Appendix A of Subpart P
The determination of the type of soil and protection system required in excavation work is a duty of the ? .
competent person
air sampling and testing must be carried out in trenches more than ? deep where oxygen deficiency or other hazardous atmospheres could reasonably be expected to exist.
4’
Submerged soil or soil from which water is freely seeping is classified as ? .Submerged soil or soil from which water is freely seeping is classified as ? .
Type C
