I was working through some of the six minute solutions problems, and I noticed that on 2 questions, they used different methods to calculate the answer. For one problem, when calculating the density of the clay soil below the water table they used the dry density*(1+w), for the second problem, same circumstance, they calculated the saturated density. I guess, i'm just confused as to why they used the the wet density in the first problem for clay below the water table. I was under the impression that clay below the water table was assumed to be saturated. Anyone else notice this? I wish i could give the problem numbers but I am at work