Just guessing here - the existing field turf field was an older generation field turf than is at the stadium and presumably at other fieldturf fields we would play on. There was a noticeable difference between the surfaces.
AIR, the stadium turf was replaced. No expert here but I think ya just peel off the surface and put down the new rug....with no need to re-do the base surface. We're installing a totally new FieldTurf base + rug on what was our grass practice field. And my question is really whether the former FieldTurf field ( middle ) will be torn up to be a grass field (?).