Hi All,

Started working on a seismo vault here.  Plans are to use an old, but
still water tight, cistern that was on the property when we purchased it

some five years ago.  The cistern is 4 feet wide, 8 feet long and 5 feet

high.  The top is about 2 feet below grade. Seems like it would make
a great seismo vault.
My guess about it still being water tight is that it was mostly full of
water but the outside ground is very dry.  Since I pumped it out, water
has
not re-accumulated.

My questions are: I want to be sure it will stay dry.  What, if any,
paint
could be used to seal it from the inside?
Also, after being in it a while, getting the last of the water and silt
out,
I got to thinking about the effects of the echoes created in such a box,

and how they may affect a seismo.
Any suggestions, comments ???

Raul




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