A 3-m-thick, wide fill (γ = 19 kN/m3) is placed over a soil profile consisting of 6 m of plastic clay (γ = 16 kN/m3, e0, = 1.7, Cc, = 1.2, OCR= 1.4, Cr/Cc, = 0.15) over 10 m of organic silt (γ = 16 kN/m3, e0, = 1.2, Cc, = 0.8, OCR = 1.0, Cr/Cc = 0.1, and Ca/Cc, = 0.06) over dense sand. The water table is at the surface of the plastic clay. Compute the settlement resulting from:
(a) primary consolidation of the plastic clay, and
(b) consolidation of organic silt after 30 years assuming that primary consolidation is completed in 7 years.