5. An L-shaped cantilever retaining wall constructed of reinforced concrete, with a weight of 150 pcf, is 8' tall from the soil level at the top to the soil level at the base and has a thickness of 1'. There is 9" of soil above the height of the 1' thick by 4' wide (total) base. The soil has a weight of 100 pcf, a passive soil pressure of 150 pcf and an active soil pressure of 45 pcf. Determine the factor of safety against overturning of the wall. [ ,1' 4' + *** 8' 9" 1'