When we ran TQ's there, we had an awful rock problem, people in the stands would come out to help us clear what we could so we could use the track, some even brought their kids Radio Flyer wagons to haul them, Liberty is the same way, has been forever, seems like they just work up thru the soil, from down deep, it's really a dangerous situation for everyone, too bad when they evidently have nice new facility, it was so dusty before also, maybe they'll get lucky and the rocks will stop working to the top.