A consolidation test was performed on a clay sample 3 cm high on both sides and taken from mid-stratum as shown below. 70% consolidation was attained in 6.67 minutes. Determine: a. the total settlement of the clay layer if the unit weight of the surcharge is 18 kN/m (GWT is at the top of the clay layer) b. the time required to attain 70% consolidation in the field in years. 2m 7m Sand Surcharge Sand Clay 7-18 AN Dense Limestone WT A 1.C 0.20, 720 AN [7] [5]