The total unit weight gt of the sand above the groundwater table = 18.7 kN/m3
and the total unit weight gt of the sand below the groundwater table = 19.7 kN/m3.
A laboratory consolidation test performed on an undisturbed specimen obtained from the center of
the clay layer (Point A, Fig. 8.10) indicates the maximum past pressure s′ vm = 100 kPa and
the compression index Cc = 0.83.