Vibro Columns, which can be either stone or concrete, are designed to transfer building loads through a weak layer of soil to an underlying competent layer. A bottom-feed dowhhole vibratory probe is advanced through the weak soil layer, such as organic soils, to the underlying firm layers. Granular bearing soils are densified by the vibrator. In Vibro Concrete Columns (VCC), concrete can either be pumped through a tremie tube attached to the vibratory probe or the materials can be dry-mixed at the surface and then be bottom-fed by the tremie tubes. In Vibro Stone Columns (VSC), crushed aggregate is used instead of concrete to provide the means of load transfer. In both techniques, a pile cap can be constructed, joining the grid of columns to provide support for foundations.