Extracted text: A footing 3 m square carries a gross pressure of 350 kN/m2 at a depth of 1.2 m in sand. The saturated unit weight of sand is 20kN/m3 and the unit weight above the water table is 17KN/m3. The shear strength parameters are c' = 0 and o = 30°. (For O' = 30°, N = 22 and N. = 20 ). Determine the factor of safety with respect of shear failure for the following cases: %3D b. %3D %3D (a) water table is 5m below ground level. (b) water table is at 1.2 m below ground level.