A one-dimensional consolidation test was performed on a sample, 0.75 in high, taken from a field clay layer. During the test, drainage was allowed at the upper and lower boundaries. It took the lab sample 15 minutes to reach 50% consolidation. a. Determine the coefficient of consolidation, cv b. If the clay layer in the field has the same drainage condition as the lab sample, calculate how many days it will require the 10-feet clay layer to achieve 50% and 90% consolidation, respectively.