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Tim
you have some interesting forensic work ahead of you. I might guess something like rebar might have started the problem, opened a crack, let in some water, and a couple freeze/thaw cycles later we have the lead bulge your ballast demonstrates. would be interesting to see what you find if you drill into the cavity behind the lead bulge....
bill
p.s. mike, oops sorry about that
Last edited by bill@ariel231; 04-02-2007 at 06:37 AM.
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