Brad,
1/8" NPT is actually a fair-sized hole, closer to 3/8". Should be plenty
unless there was gravel mixed with the mud. I think your plan is eminently
workable.
Drilling by hand, I doubt you'll reach ignition temperature for gasoline
anyway. I've seen a cigarette put out in the stuff. But a gallon or two of
water wouldn't hurt anything, JIC. A little cutting oil will help keep the
bit and swarf cool, too.
-- Randall
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