Thank you everyone for the tremors info.
I believe I do have my answer that it is BLASTING around the Quarry area.
I called DistGov again and they could not confirm "blasting", but alluded to it. So it lines up to what everyone is saying here.
I will not worry for now since it is infrequent. And, it does occur early morning / mid-day during a weekly "work day." Thus, a construction crews likely work hours.
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