A sand 9m thick was found to have a ground water table 4m below the ground surface (sand). The dry sand above the ground water table was found to have a specific gravity of 2.65 and a void ratio of 0.63, while the saturated sand was found to have a specific gravity of 2.67 and a void ratio of 0.49, determine the effective stress in kPa at 9m below the ground surface.

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