The top slab of the existing culvert failed during the subgrade proofrolling operation as repairs were being made to the existing taxiway pavement.

The two-barrel cast-in-place reinforced concrete box culvert (RCBC) is 9’H x 9’W. The taxiway pavement structure originally consisted of 20 feet of reinforced concrete and a minimum of 8 feet of compacted drainage stone placed directly on top of the existing RCBC.  The estimated total pavement structure section thickness is 3-feet-6-feet thick. The taxiway pavement is 75 feet wide with 25-foot paved asphalt shoulders for a total width of travel way of 125 feet.