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Not any kind of an E ...
but I'd dig a deeper (slightly - 4" maybe, just so you can have the same level but have a few inches of new concrete over the old) and wider hole, and scrape out parts at the bottom so you have an over hang. Think of what the inside of a 22 case at the rim would look like kinda. Put your pole and plug back in, pour new concrete around and over to totally encase and hopefully get the "rim" part you dug out filled with concrete, forming a mechanical lock. Drilling holes, chipping pieces, etc. on the cement plug will help the old form a mechanical bond with the new as well.
I'd also bet that part of the ground holds more moisture due to the extra run off you mentioned and therefore there was more effect from the freeze/thaw cycle as water turned into ice and expanded, etc.
Last edited by id10t; 04-18-2019 at 06:23 PM..
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