Soil borings made at a site near Chicago indicate that the top 6 m is a loose sand and miscellaneous fill, with the groundwater table at 3 m 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 16 m below the ground surface when fairly stiff silty clay was encountered. Make reasonable assumptions as to soil properties and calculate the total, neutral, and effective stresses at 3, 7, 12, and 16 m below the ground surface.?