1. A one-dimensional consolidation test is performed on an undisturbed sample of clay and the following results are obtained: Effective vertical stress (kPa) 20 40 80 160 320 640 1280 320 80 20 Void ratio 0.953 0.945 0.937 0.927 0.889 0.789 0.691 0.708 0.722 0.738 (a.) Plot these "e-logP" data points on a semi-logarithmic plot. Use a logarithmic scale on the horizontal axis for effective stress and a linear scale on the vertical scale for void ratio. Set reasonable limits for the axes. You may try to let Excel connect the data points with a smooth line, but if it doesn't look reasonable, you may have to sketch it in by hand. (b.) From your plot, find the compression index (Cc), the recompression index (Cr), and the maximum past effective stress (o'c)/preconsolidation pressure (o'p) for this clay sample. (c.) The undisturbed clay sample was taken from the middle of a 6-m thick stratum where the effective vertical stress was 120 kPa and the in situ void ratio was 0.97. If an embankment that increases the vertical stress by 180 kPa is now built, how much settlement will occur as a result of consolidation in the clay layer?