A clay soil deposited in an estuary and originally normally consolidated (OCR = 1) has been subjected to water table fluctuations. The historically lowest water table level was 6 m below ground level and the present water table is at 2 m below ground level. Assume the clay to be fully saturated with a unit weight of 19.5 kN/m3 . Determine the overconsolidation ratio at 2 m, 6 m, and 20 m below ground level. What do you learn from these calculations regarding the effects of water fluctuations on stresses in soils