Typically, artificial turf fields have three main layers: a padding at the bottom, a crumb rubber infill at the center, and a top layer of plastic blades that resemble grass. Over the last 60 ...

"When you're putting a grass sod field over existing turf, you would put a hard plastic cover over the turf before putting the sod down," Tretter said. "My understanding is that's not what happened.

An agency spokesperson confirmed to The Athletic that the entire amount will be used to turn the stadium’s field over to grass.