2) Design a wall footing to support a 12-in wide reinforced concrete wall with a dead load DL= 20 K/ft.
and a live load LL=15 K/ft. The bottom of the footing is to be 4 ft below the final grade, the soil weight
100 Lb/ft³, the allowable soil pressure, qa is 4 Ksf and there is no appreciable sulfur contact in the soil
Fy= 60 Ksi and fc'= 3 Ksi, normal weight concrete.