A layer of clay 2 m thick underlies a sand of 1 meter deep. An undisturbed soil sample was taken at 2-meter depth below the ground level and following observation were recorded:

 Natural water content of clay (w₀) = 22 %, preconsolidation pressure of clay (σ̅_c) = 75  kPa, compression index of clay (C_c) = 0.5, specific gravity of clay (S) = 2.65, recompression index (C_r) = 0.08, and bulk unit weight of sand (γ_bulk) = 16 kN/m³.

The increase in effective over burden pressure is 100 kN/m² due to construction of a commercial building. If the water table is at 1 meter below the ground level. The settlement of clay due to construction is (in mm) _______