A building is to be constructed on a 50 ft deep, normally consolidated clay layer. The building applies a stress of 3000 psf on the ground surface. Compute the expected ultimate primary consolidation settlement of the clay layer. The clay has a saturated unit weight of 110 pcf. The compression index and recompression index of the clay layer are 0.2 and 0.04, respectively, with an initial void ratio of 0.9. Subdivide the clay layer into 5 layers.