$10\mathrm{.}6$ A continuous footing of width $B$ will be loaded at $25,000lb$ per linear foot of length. As Fig. P$10\mathrm{.}6$ shows, the

footing will be placed $3ft$ below the surface of a sand deposit, with the water table $2ft$ below the ground surface.

Other soil properties are shown. What footing width will be required to achieve a factor of safety of $3\mathrm{.}0?$