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A granular soil has $\phi = 35^{\circ}$, $\gamma_{sat}$=19 kN/m$^{2}$. A slope has to be made of this material. If the factor of safety of 1.3 is needed against slope failure.

find the safe angle of slope when the slope is dry or submerged without seepage. Also find the factor of safety at a depth of 4m for the same slope if the seepage occurs parallel to the slope with the water table at the depth of 1.5m from the ground level assume angle of slope as 28°.