A site consists of a homogeneous dense silty sand layer of 10 m thickness, which is underlain by an impervious stiff clay stratum. The initial water table was at 3.0 m depth below the ground level. A pumping test was carried out by pumping out water at the rate of 0.5 m3/min. Observation wells were dug into the ground at 20 m and 40 m distances from the centerline of the well. At steady state (i.e., when there was no change in water levels in the observation wells), the water levels in the two wells dropped by 500 mm and 150 mm, respectively. Determine the hydraulic conductivity of the clayey sand layer.
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