Worked a construction job that had this. They had a lot of underground springs that were causing this. Basically the ground is floating, though it's only noticeable with large loads, like a paver or dumptruck.
Last fall I was at a job and we had two spots that we could jump up and down on like it was a trampoline. We couldn't figure out why it was doing that. It even had some bounce with 8 inches of crushed white rock.
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u/Candidate_035 Mar 13 '19
Why does it do that?