The Terminal E Ticketing Concourse is an open space approximately 75 ft wide and 625 ft long.  The floor structure is a lightweight slab on composite metal decking and includes a concrete overlay with an epoxy terrazzo floor surface.  After the contractor placed the 4 in. thick overlay, they observed lifted slab edges, cracks, and hollow-sounding areas in some locations.  The contractor retained SGH to investigate the problem and provide repair options.