Soil borings made at a site near Chicago indicate that the top 6m is lose and miscellaneous fill, with the groundwater table at 3m below the ground surface. Below this is a fairly soft blue-gray silty clay with an average water content of 30%. The boring was terminated at 16m below the ground surface when a fairly stiff silty clay was encountered. Make reasonable assumptions as to the soil properties and calculate the total, neutral and effective stresses at 3, 7, 12 and 16m below the ground surface.