Is the racing surface dirt from the old track? How thick is the top layer? I was told the fill underneath was brought from a large road cut excavation in Hooven,Oh. Lots of blue shale rock. Is it possible that some rocks could migrate to the surface?
On the other hand I've been to very few tracks that did not have some small amount of rocks- just not that large in size.
Not trying to bash- just my observation.
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