Go back to your CPT HW analysis plots. Look particularly at the plots of u2 and un, FR, and o'. Notice how these parameters behave at z = approximately 20m,

z = approximately 21.5m, and z = approximately 23.5m. The u2 spikes above un, the FR spikes up, and the o' spikes down. These are very thin layers of fine soil that found themselves layered in a large coarse grained soil deposit over the history of the site. Such thin layers or "seams" were probably deposited during draughts. Classify the soil that composes each of these seams using the classification chart (no need for a graph-chart combo;simply select a representative FR and a representative qi for each seam (do this by eye, looking at the plots; do not pick exact values from the data).a.