Problem No. 1 7.1 A foundation for a long concrete block wall of thickness 0.2 m (8 in.) will be founded on a dense sand (d', from direct shear test = 32°; D, = 85% and Ysat = 17.8 kN/m³ (113 pcf)). The wall will transmit a vertical live load load of 60 kN/m (4000 lb/ft) in addition to the estimated foundation dead load of 7.5 kN/m (500 lb/ft). The foundation is to be located 0.5 m (1.5 ft) below finished grade. The groundwater level is 5 m (16 ft) below finished grade. Determine the size of the foundation (width) using ASD for FS = 3. Investigate the effects of a rise of the groundwater to (a) the ground surface and (b) the foundation base.