A soil was found to have PL = 30%, LL = 70% and in-situ water content of about 65%. What can you say about its engineering properties? Solution For its PL and LL we know that its PI=70-30=40 what it tell us that it is a soil with a high plasticity, this class of soil commonly has clay minerals present in its structure, its engineering properties as foundation soil, are very bad because this class of soil retains water for very long periods of time, causing big settlements of the structure in long periods of time, and when they are moistened, they suffer very major expansions, causing damage to the structure. But this soil has good applications too, it can be used as a soil base of municipal garbage collector, because the very low permeability of this soil, they don\'t allow to the leachate infiltrates the ground and contaminate it. .