Same problem in Liberty Park a few years ago. I experienced sheared off sewer pipe; it was repaired, and a few weeks later more fill dirt had to be added. This second work proved to me that excavations here are not sufficiently tamped. Settlement can shear off plastic pipes.
More on settlement: You will notice asphalt having been patched near many storm water drains along many of our roads. I believe that also due to insufficient tamping of the backfill around the initial construction.
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