In 1970, the natural grass turf was replaced with Poly-Turf, which was in turn replaced by AstroTurf in 1975. Seating capacity was increased to 75,808 in 1977 and further increased to 83,091 in 1991. The turf was changed back to a natural Bermuda grass surface in 1995 in order to host soccer events for the Summer Olympics in Atlanta. In 2006, the field went back to an artificial surface with infilled FieldTurf. The field has a conventional north-south alignment at an approximate elevation of above sea level.