Was that a plastic drinking cup covering the pipe in the first picture?
If it is in the same spot as the place where the foundation people were working, maybe it's a hole for testing the soil. Don't know why there would be a pipe there. I know very little about getting core samples of soil for foundation tests. Or maybe it leads to a cistern. Is there a downspout or a logical place for a previous downspout nearby? Or maybe it it tied into the sewer system and is some sort of clean out. Does it smell bad? That's probably the most logical guess.
If you lived up north I'd be suggesting buried heating oil tanks.
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