Now you have to control the risk of engulfment in ground collapse. There are four measures you can use. Which would be the best one to implement?

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Instructing workers via SWMS not to enter the trench

]]> Excavating benches in the sides of the trench or install trench shield to stabilise them

]]> Providing workers with personal protective equipment (PPE)

]]> Installing danger signs around the trench

]]> Correct.

]]> Incorrect.

]]> Failed.

]]> Not quite. Benches in the trench would be an engineering control, which is the most effective control out of the four available. Benches should be a maximum of one metre vertically and a minimum of one metre horizontally.

]]> That’s right. Benches in the trench would be an engineering control, which is the most effective control out of the four available. Benches should be a maximum of one metre vertically and a minimum of one metre horizontally.

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