The coefficient of consolidation of a clay for a given pressure range was obtained as 8x10^-3 mm^2/sec on the basis of one-dimensional consolidation test results. In the field, there is a 2-m thick layer of the same clay. Based on the assumption that a uniform surcharge of 70 kN/m^2 was to be applied instantaneously, the total consolidation settlemwnt was estimated to be 150mm. However, during construction, the loading was gradual; the resulting surcharge can be approximated. Estimate the settlement at t=30 days and t=120 days after the beginning of construction.