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  1. #21
    Forum Member
    Join Date
    Feb 2003
    Canada's North


    Quote Originally Posted by ADSNWFLD View Post
    With that being said, you almost never have class "A" soil because you drop 1 level due to prior collapse. You could have "A" if you had a medical emergency in an unshored trench, and in that case it is vital that we don't screw around with shores we don't need.
    Just curious ADSNWFLD, where is it written that a prior collapse lowers the soil classification 1 level? That's the first time I have ever seen that stated.

    I have always been taught that a collapse indicates unstable soil conditions and should be treated as Class "C" soil. If the trench has collapsed once there is a high risk that it could collapse again.
    Last edited by CANFF2706; 02-25-2011 at 12:39 PM.

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