A long slope is to be formed in a soil of unit weight 19 kN/m 3 for which the characteristic shear strength parameters are c′ =0 and φ′= 30°. A firm stratum lies below the slope. It is to be assumed that the water table may occasionally rise to the surface , with seepage taking place parallel to the slope. (a) Using the traditional method , determine the maximum slope angle to ensure a factor of safety of 1.5 , assuming a potential failure surface parallel to the slope. (b) What would be the factor of safety of the slope , formed at this angle , if the water table were well below the surface?