In the pictures, the curbing and maybe the concrete do not look like they were original from the building of the house.
I suspect that the pvc white pipe was used to by-pass sprinklers that were covered by one or the other after either the curbing or concrete were installed.
In fact, if the curbing and concrete were done at different times, then the white pipe could have been a sprinkler fix for the first job that was then re-by-passed during the second job.
Concrete and curbing guys would use pvc rather than the purple pipe that sprinkler guys use.
Just an possibility.
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