c-

It could be they were installing a fence.
It could be they needed to know what the floor was composed of so that 
they could tell if it would hold a load.
It could be they needed to drop a plumb line through 3 floors in order 
to orient for layout (did that recently).
It could be a masters preservation student inventing a new way to repair 
old floors. Drill hole then insert brain.
It could be delamination of sidewalk, such as at the Regency, or a need 
to determine if a waterproof membrane is present.
It could be to determine that there actually is 4" of floor and not 2.36".
We did this boring work a lot at Grand Central Terminal and mainly it 
was either for determination of location (hard to tell in a vertical 
context where you are in that place) or for composition of the floor.
At the former WTC we did it at the B3 garage level into the walls so 
that the materials scientists could figure out fire rating. Obviously 
boring cores is not a surefire way to save lives.
We may be doing it in future on a smaller scale on Dalle de Verre 
stained glass windows in order to determine possible thermal fatigue in 
the epoxy matrix.
I'll make sure to leave samples in a bucket on the sidewalk outside of 
your residence in DFI.

][<


[log in to unmask] wrote:

> Why would someone repeatedly drill through 4" of floor?

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