Problem $5.$

You are designing a continuous footing to support the walls of a tilt up structure. The wall loads will be $25\frac{k}{f}t.$ The footing will be founded at a depth of $3$ ft on a medium dense sand with $c^{\text{'}}=0,{}^{\text{'}}=33,$ and $=124l\frac{b}{f}{t}^3.$ The groundwater is at a depth of $4$ ft $.$ Using a factor of safety of $2\mathrm{.}75,$ compute the required footing width.