I mean, I know a septic tank in northern LP Michigan that's been there for 20+ years and I can authorize you to test that theory if you pump 100% of it out and suck all the way down to the bottom where the quarters would be...
chatgpt also told me I can just use a lead composite magnet to attract the zinc layer of the quarters essentially fishing them out of the tank....en route from northern wisconsin now, magnet in hand
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http://www.smbc-comics.com/comic/aaaah
yeah that's the problem.