Plot the following void ratio versus pressure data. Evaluate the compression index (Cc) and the recompression index (CR). (b) Determine the pre-consolidation stress (following the Casagrande re-construction method (1936) described in section 8.5.2). (c) Assume that this material exists in a 6-m thick layer. The effective vertical stress at the middle of this layer is initially 130 kPa and an additional 175 kPa of external vertical stress is then applied from an above structure. What is the ultimate settlement that would be expected from the placement of this structure. (d) What would the settlement resulting from this same structure be if the over-consolidation ratio of the clay were initially 1. Again, assume the layer is 6 m thick, the initial effective stress is 130 kPa (at mid-depth) and an additional 175 kPa of external vertical stress is applied from the structure