$(1$a$)$ The profile shown above will be quickly dewatered to allow a large and complex

construction on an adjacent lot. Assuming that the bedrock is impermeable, calculate the

effective vertical stresses at point $P$ which is located at mid$-$layer before and after dewatering.

$(1$b$)$ Calculate the total primary settlement of the clay caused by the dewatering using the

following the following values:

$Gs=2\mathrm{.}70$

$Cc=0\mathrm{.}8Cs=0\mathrm{.}07C=0\mathrm{.}01Cv=7\mathrm{.}5\frac{m^2}{?}$ year

OCR$=1\mathrm{.}35($for "initial" groundwater level$)$

$(1$c$)$ Predict the settlement of the clay layer after:

$1$ months of dewatering

$3$ months of dewatering

$9$ months of dewatering

$27$ months of dewatering