Consider the soil profile shown in Figure E$3-2.$ The most unit weight of the top sand layer is $20\mathrm{.}0k\frac{N}{m^3}.$ Capillary rise is present above the groundwater table. The saturated unit weights of clay $1$ and clay $2$ are $17\mathrm{.}8$ and $18\mathrm{.}5k\frac{N}{m^3},$ respectively. Between these two clay layers is a sand seam of negligible thickness. The tip of Piezometer $1$ is within this Sand seam. The tip of Piezometer $2$ is at the bottom of the Clay $2$ layer

At Points A$,$ B$,$ C$,$ D$,$ E$,$ and F$,$ determine

$($a$)$ the vertical total stress prs$)$

$($b$)$ the pore Auid pressure $(20$ pta$)$

$($c$)$ the vertical effecthve stress $(10$ pto$)$

Figure E$3-2$