This paper addresses the cause of large upward slab movement caused by deep seated swelling of the Eagle Ford Shale Formation. Upward slab movements of over 2.5 inches occurred as a result of soil swelling between depths of 11 to 15 feet within 4 years after construction. The potential existed for additional 6-inches of upward movement if the free water source causing the deep seated swelling was not identified and eliminated. The movement occurred at a site where a 12-inch cap was placed over 1 Q-feet of water injected soil that had been inspected and tested with borings and swell test verification that the soil swell had been reduced to 1-inch. The free water source causing the deep swelling was a fire protection water line that had corroded along the outside of the pipe due to soil corrosion and along the inside of the pipe due to an unusual micro-organism occurrence. This paper addresses the specific details of the documented deep seated swelling as well as specific details associated with the pipe corrosion.