QUES $2)$ A footing $2\mathrm{.}25\backslash$times $2\mathrm{.}25$ m is located at a depth of $1\mathrm{.}5$ m in a sand for which c $=0$ and $=38.$ The unit weight of the sand above the water table is $18$ kN$/$m$3$; the saturated unitweight is $20$ kN$/$m$3.$ Determine the bearing resistance;$($a$)$ if the water table is well below foundation level and$($b$)$ if the water table is at the surface.