You have an excavation that you plan to support with a reinforced concrete wall that will become part of the final structure. Your excavation will be 22 ft deep, the friction angle of the soil is 37 degrees, the unit weight of the soil is 120 lb/ft3 and the overconsolidation ratio is 2. Assume that the wall is designed to not flex or yield and the water table is well below the bottom of the wall