A site is underlain by two soil layers over bedrock. The unit weights of the top $($sand$)$ laver are $19$ and $21k\frac{N}{m^3}$ and the layer is $6$ meters thick. The

unit weights of the bottom $($clay$)$ layer are $20$ and $22k\frac{N}{m^3},$ and the layer is $8$ meters thick. The water table is located $2$ meters below the ground

surface. Important: when two unit weights $($or densities$)$ are given for a soil. then one is the dry unit weight and the other is the saturated unit

weight. $($a$)$ Draw the profle neatly, add dimensions, and draw a tree on the ground surface. $($b$)$ Determine the vertical total stress at point A$,$ which is

located at a depth of $10m.($c$)$ Determine the vertical effective stress at a point $A.$

Consider the profile in problem $6($above$)$ and calculate the horizontal effective stress at point $A.$ The lateral stress ratio of the sand layer is $0\mathrm{.}4$ and

that of the clay layer is $0\mathrm{.}5.$ Ans $=65$kPa.