Pr$.6.$Lem. $6\mathrm{.}6.$ Completely design the cantilever retaining wall shown. The height of wall $h_w$ is $22n,$ the backfill is level, the surcharge is $600psf,w_e=100l\frac{b}{n^3},h^{\text{'}}=4,K_a=0\mathrm{.}30,$ and the allowable soil pressure is $4ksf.$ Use a coeflicient of friction of concretc on soil of $0\mathrm{.}5,f_c=3000,$ and $f_f=60,000.$ The required factor of safety against overturning is $2\mathrm{.}0$ and against sliding is $1\mathrm{.}5.$ The wall batter should be between $\frac{1}{4}$ and $\frac{1}{2}$ in$.\frac{?}{?}.$ The design is to be in accordance with the ACl Code $(318-08).$