Design the $4-$ft$.$ x $6-$ft$.$ spread footing shown. The footing supports an $18-$in$.$ x $24-$in$.$ column. Assume the footing resists the maximum bearing pressure, qu$=8,000$psf$.$

Assume a critical section for flexure and moment at the face of the column.

$1.$ Determine the number and bar size for the flexural reinforcement, As

$2.$ Determine the footing thickness to resist shear $($shear reinforcement is not typically provided in footings$).$