Problem $5\mathrm{.}5$

A column foundation $($Figure P$6\mathrm{.}9)$ is $3m2m$ in plan. Given: $D_f=1\mathrm{.}5m,{}^{\text{'}}=25,c^{\text{'}}=$

$70k\frac{N}{m^2}.$ Using Eq$.(5\mathrm{.}30)$ and FS $=3,$ determine the net allowable load $[$see Eq$.(5\mathrm{.}28)]$

the foundation could carry.