excavating the trench Flashcards
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’
Soil weighing 100 pounds per cubic foot will have a cubic yard weight of ?
2700 lbs
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 subpart p
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 ?
type c
The use of a sloped protection system in loose sand will have a run to rise ratio of ?
2:1
Soil with an unconfined compressive strength greater than 0.5 tons per square foot (tsf) but not less than 1.5 tsf is classified as ?
type b
In an excavation that reveals a layered system where the layers are on a slope of four horizontal to one vertical or steeper, the soil is classified as ?
type c
