grounding rods

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grounds wires from an electricl panel inside ine houuse exiting through the foundation below the outside grade

They don't have to exit below grade you can come out above grade and lb down into the ground. :-? Are you asking how deep must it be?
 
I know some guys who will run their GECs below grade when they exit the structure just to keep the copper theives from cutting it out. But I don't think there's an NEC requirement to do so.
 
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