The Mercury Block | 21.7m | 6s

Seems to me they are having high water table issues. Multiple drainage points along the pipeline.
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Would there have been an underground stream in that area that used to help feed Groat?

But yes, water table and soil composition certainly impact things.

Hydrostatic pressure is a real concern for these kinds of structures/foundations and so additional waterproofing and an enhanced weeping system will be required. Often times if it is sandy, soil infiltration can be a real problem for these systems and reduce their performance by 40-50% which further compounds the problems.
 

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