Thank you for the very detailed report about your unfortunate drain pipe problem.
I think that some time in the future you will have to dig up the area that has the problem so that the pipe can be fixed to allow the water to completely drain back into the tank.
Trying to put a band-aid on it will just give you more problems in the future and you will always worry about it freezing again.
Also I think you are right that the heavy equipment that was used to pave your driveway caused the problem.
Good luck with whatever you decide to do.
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It's never crowded along the extra mile.
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