A storage tank of diameter of 30 m and gross (total)weight 105 kN is to be constructed on site shown below. To construct the tank 5 m of the dense sand layer will be excavated and the tank will be built as shown .a) Calculate the increase in stress in the clay layer under the center of the tank . b) Calcuate the final consolidation settlement due to the tank. C) how much settlement that would be expected to occure 1 year, 5 years and 20 years after the tank is completed. d)- Assume that the silty clay were originally overconsolidated (OCR=1.4), how would be the ultimate consolidations settlements be different? Given c 0.03 %3D Dense Sand, G,-2.80; e=0.55 10m 0.95 Saturated nomially consolidated silty clay C43 10" m day 20 m G267: Drained permicable sandstone