Question # $1$

A square foundation is shown in Figure below. Determine the width of footing, B$,$ if the relative density of the soil is $50\%,$ and the eccentricity in one direction only. Consider ground water table at $1\mathrm{.}0$ m below footing and saturated unit weight is $18\mathrm{.}81k\frac{N}{m^3}.$ The vertical allowable load with factor of safety $3\mathrm{.}5$ is $400$ kN $.$

Note: please to validate each assumptions you used.