The last event on that particular turf was this past Sunday. They started removing it yesterday, 11/28, due to a known warranty issue. That didn't affect safety but, still required replacement.
The infill material they use is different than anything else you'll see on a high school field. It's meant to play more true and slightly firmer than crumb rubber. Crumb rubber, especially on newer and high end fields, tends to feel too soft under foot.
It's ground up coconut hulls