At a reclamation site for which the soil strata is shown in figure, a 3m thick layer of a fill material is to be laid instantaneously on the top surface. If the coefficient of volume compressibility, mv for clay is 2.2 `xx` 10-4 m2 / kN, the consolidation settlement of the clay due to placing of fill material will be

69.5 mm
139
228 mm
278 mm