Slopping is method of excavation in which the sides of an excavation are laid back to safe angle to prevent cave ins. Trench boxes are generally used in open areas but they also may be used in combination with slopping and benching.The boxes should extend atleast 18 inches above the surrounding area, if there is slopping towards excavation.This can be accomplished by providing a benched are adjusted to the box.Earth excavation to a depth of 2 feet below the shield is permitted.
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