Calculate the maximum and minimum pressures under the base if the water table rises behind the wall to the level 3.9m from the top of wall. The shear parameters of soil are C=0, ɸ =38$^{\circ}$, $\gamma_{sat}=20 kN/m^{3}$. Unit weight of concrete is 24kN/m$^{3}$. If wall friction is taken as 25$^{\circ}$ on the base of wall, check the stability of all for all conditions.