Question 3 underlies a surface layer of compact granular soil 3m deep. The unit weight for the At a planned construction site, a 2m thick stratum of normally consolidated clay compact granular soil is 20.2 kN/m³, The clay material has a unit weight of 17.6 kN/m³. The groundwater table is very deep. Laboratory testing of the clay indicates an in-place void ratio of 1.35 and a compression index of 0.42. The building planned for the site will create a stress increase of 25.4 kN/m³ at the center of the clay layer. a) Assume that the foundations for the building will be situated near the surface of the upper compact granular soil layer. Determine the foundation settlement due to primary compression occurring in the clay layer because of the stress increase. b) Calculate the settlement to be expected if the groundwater table were at the soi surface and compare to (a).