i have access to a very well maintained green grass area, where they drill
down every year with holes the size of a fat short cigarette, and then fill
the holes with sand presumably to assist drainage.

they then dump the drillings in a heap. would these drilling leftovers be a
good source of soil for pots? or would this soil since it has had grass
growing on it for many years be kind of exhausted?

thanks for any help.