Detroit soil, especially the closer you get to the river, is nearly of a slurry consistency, that is - its clayish with a very high water content. The deeper you dig the more water will seep through concrete and foundation seams and cracks. At some point, it is worthless to dig any deeper because the water just cannot be stopped. I am not aware of the Savoyard Creek intersecting the building anywhere, but if was in the genreal area, say 100-200 feet, the creek has likely been filled in and the water diffuses through the soil, saturating everything around it rather than running in a specific channel.
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