Well that's a bummer.
Dave, I would assume even a rig used to drill a water well would have a fitting to pump something (water?) into the well through the pipe while drilling to keep the bit cool and flush the dirt out. Is mud not needed for water wells?
On the other hand, would drilling a typical water well flush out enough clay to seal a forage pond? Hopefully my question makes sense...I might just be picturing this all wrong. I don't have any drilling experience.